Goa Board Class 9 Sample Paper Science

Sample Paper
&
Question Paper Pattern
2022
2023

GOA BOARD

GOA BOARD OF SECONDARY AND HIGHER SECONDARY EDUCATION
SECOND TERM EXAMINATION MODEL PAPER
MARKS :30 SUBJECT : SCIENCE (ENGLISH ) TIME : 75 Min
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Q.1 A) Select the most correct alternative from those given below each statement and
write the completed statement: 1
1. An element which is necessary for the thyroid gland to make thyroxine hormone is
________________
 Calcium
 Sodium
 Iodine
 Potassium
2. The part of human brain that controls posture and balance is the ___________
 Cerebrum
 Medulla
 Cerebellum
 Pons
B )i) Match the items in column 1 with the appropriate answer from column 2.
Rewrite the corrected pairs. 1
Column 1 Column 2
1. C3H7OH a. Ethanol
2. C2H5COOH b. propanol
c. Ethanoic acid
d. Propanoic acid

ii) complete the given Homologous series:
CH3Cl , C2H5Cl , X , Y , C5H11Cl 1
C) i) Methane, Ethane. Propane, Ethene., Butene and Propyne are Hydrocarbons.
Name any two unsaturated hydrocarbons from above statement. 1
ii) Unsaturated carbon compounds are more reactive than saturated compounds.
Give reason. 1
iii) Draw the electron dot structure of Methane 1

D. i) The brain is contained in a fluid filled balloon inside the cranium.
Give a reason. 1

ii) What does Peripheral Nervous system consist of? 1
iii)Draw a neat scientific diagram of Neuron and label Dendrite and Nerve ending. 2
Q2.Ai) Select the most correct alternative from those given below each statement and
write the completed statement: 1
1. Mendeleev predicted the existence of some elements which were discovered later
and found place in the periodic table. One such element was__________ .
 Germanium
 Chlorine
 Oxygen
 Silicon
2.Element that was earlier named as Eka-Aluminium in Mendeleev’s Periodic Table
was____________ .
 Silicon
 Boron
 Gallium
 Scandium
ii. Attempt the following. 1
An element x has atomic number 17. To which period and group does it belong?
iii. Answer the following. 2
a. In Modern Periodic table, atomic radius decreases in moving from left to right
along a period. Give reasons.
b. State the Mendeleev’s Periodic law.
B) i) Observe the correlation in the first pair and complete the second: 1
(a) Black insulation wire: Neutral :: Red Insulation wire :____________
(b) Commutator : Reverses the flow of current : Armature: ______________
ii) Attempt the following: 2
a) Construct a food chain using the mentioned components: Grasshopper,
snake, Frog and Plants.
b) Food chain consists of only three to four steps. Why?

C) Observe the given figure and answer the questions given below: 3

1. How is the relative strength of the magnetic field
shown?
2. No two field lines are found to cross each other.
Why?
3. Write any two characteristics of magnetic field.

OR
C) Direction of magnetic field in a solenoid is similar to that of bar magnet. 3
1. Magnetic field lines inside a solenoid are in the form of parallel straight
lines. What does it indicate?
2.On what principle does electric motor works?
3. Name any two home appliances which are generally connected to earth wire.

Q 3A. Select the most correct alternative given below each statement and write the
completed statement: 1
1. The characteristic which predominates and is clearly expressed in F1 Progeny is
said to be __________
 Dominant
 Acquired
 Recessive
 Inherited
2. A section of DNA that provides information for one protein is ________.
 gene

 chromosome
 Nucleus
 Trait

B. i) Match the items in column A with appropriate answer from Column B and
rewrite corrected pairs: 1
A B
Power volts
Potential difference ampere
watt

ii) Flow of energy is unidirectional. Write a reason. 1
C) i) Answer the following: 1
Write two methods used to determine the age of fossil.
ii) Cellular DNA is information source for making proteins in the cell. 2
a. What influences each trait in Human beings?
b. It is the father who decides the sex of child in human beings. Justify.

(D) (i) Resistance R1 and R2 are in parallel connection and have values as 3
ohms and 6 ohms respectively and are connected to a battery of 12
volts in a circuit. Calculate: 4
(a) The effective resistance

(b) The current flowing through the circuit

(ii) Coils used in electric heaters are made from an alloy rather than pure
metal. Why?
(iii) Draw the symbols to represent following components of an
electric circuit.
a) Plug key or switch (closed)
b) A resistor of resistance R
OR

(D) (i) Two resistors with values 4 ohms each are connected in parallel and
the current flowing through the circuit is 5 amperes.
Calculate: 4

(a) The total resistance.

(b) The voltage of the battery.
(ii) Why tungsten is used for making filaments of bulb ?
(iii) Draw the symbols to represent following components of an
electric circuit.
a) An electric cell
b) A wire joint

Answer Key
SECOND TERM EXAMINATION MODEL PAPER
MARKS :30 SUBJECT : SCIENCE (ENGLISH )
Q.1 A 1) Iodine ½ mk
2) Cerebellum ½ mk
B.i)1) Propanol ½ mk
2)Ethanoic acid ½ mk
. ii) X – C3 H7Cl , Y – C4 H9 Cl ½ mk + ½ mk
C. i) Ethene, Butene , Propyne (Any Two ) ½ mk +1/2 mk
ii) because they have double or triple bonds between their carbon bonds 1mk
iii) Fig 4.5 pg 65 1 mk

D. i)Which provide further shock absorption 1 mk
ii) Cranial nerves arising from brain and spinal nerves arising from the spinal cord
1 mk
iii).Fig 7.1 (a) Pg 124 diagram 1 mk, Labellling ½ mk + ½ mk
Q.2 Ai) 1. Germanium ½ mk
2. Gallium ½ mk
ii). (2,8,7 ) Period -3 ½ mk
Group 7 or 17 ½ mk
iii) a) due to an increase in nuclear charge which tends to pull the electrons closer to
the nuclei and reduces the sizes of the atom 1 mk
b) The properties of the elements are the periodic functions of their atomic masses
1mk
Q. 2 B i) a)Red Insulation wire : Live wire ½ mk
b)Armature: Enhances the power of motor ½ mk

ii) a) Plants → Grasshopper → Frog → Snake 1mk

b) Only 10% of energy is transferred from one tropic level to the next tropic level.
Hence the loss of energy at each step is so great that very little usable energy remains
after 3-4 tropic level 1mk
C) 1. By the degree of closeness of lines 1mk

2. Because if they did, it would mean that at the point of intersection, the compass
niddle would point towards two directions which is not possible. 1mk
3. -Magnetic field is the quantity that has both magnitude as well as direction.
-No two field lines cross each other. 1mk
OR
C) 1. It indicates that all magnetic field is the same at all points inside the solenoid or
Magnetic field is uniform inside the solenoid .(accept any one point) 1mk
2.When a current carrying conductor is placed in a magnetic field ,it experiences a
force . 1mk
3.Examples like -electric press, toaster, table fan, refrigerator, etc.(accept any 2
correct examples) 1mk
Q3A) 1. Dominant ½ mk
2.Gene ½ mk
B)i) Power – Watt ½ mk
Potential difference – volts ½ mk
ii) Energy captured by the autotrophs does not revert back to the solar input. 1mk
C) i) – the fossils we find closer to the surface are more recent than the fossils we find
in deeper layers. ½ mk
- by dating fossils. ½ mk
ii) a) Each trait in human being is influenced by both paternal and maternal DNA.1mk
b) A male child will be born if the sperm containing Y chromosome fertilises the
egg and the girl child is born if the sperm containing X chromosome fertilises the
egg. 1mk
D)i) a) 1/Rp = 1/R1 + 1/R2
= 1/3 + 1/6 ½ mk

= 6+3

18
=½
Rp= 2 Ohm ½ mk
b) I = V/R
= 12/2 ½ mk
= 6 Ampere ½ mk
ii) Alloys have high resistivity and do not oxidise at higher temperatures . 1mk

iii) a)Plug key or switch (closed) ½ mk

b) A resistor of resistance R ½ mk
OR
D) i) a) 1/RP = 1/R1 + 1/R2
= 1/4 + ¼ ½ mk
= 2/4
= 1/2
RP = 2 Ohms ½ mk

b) V = R x I
=2x5 ½ mk
= 10 Volts ½ mk
ii) Because tungsten has very high melting point (3380°C). 1mk

iii) a) An electric cell ½ mk

b) A wire joint ½ mk

SECOND TERMINAL EXAMINATION
Model Paper
Time : 75 mins. SUBJECT CODE: S-1031 SCIENCE(E)

Total No. Of Questions : 3 Max.mks : 30

***************************************************************

INSTRUCTIONS:1) The Question paper comprises of 3 questions of 10 marks each.
2) All questions are compulsory
3) There is no overall choice, however internal choice has been
provided in one question of 3 marks and one question of 4 marks
category. You have to attempt only one option in such questions.
4) Begin each main question on a fresh page.
5) Figures to the right indicate full marks.
*****************************************************************
Q1A.Select the most correct alternative from those given below each
statement and write the completed statement. (1)
a)Pentanone is a five-carbon compound with the functional group _______.
• Carboxylic acid
• Ketone
• Aldehyde
• Alcohol
b)The molecular formula of cyclohexane is ___________.
• C6H6
• C6H10
• C6H12
• C6H14
B. a) Why are covalent compounds generally poor conductors of electricity? (1)
b) Draw the structure of butanoic acid molecule. (1)

C. a)Saturated compounds have only carbon-carbon single bonds. Whereas,
unsaturated compounds have carbon - carbon double bonds and triple
bonds.
i) How can we convert unsaturated hydrocarbon in to saturated? (1)
b) Why are carbon and its compounds used as fuels for most applications? (1)
c) The atomic numbers of three elements X, Y and Z are 4, 12 and 17
respectively. (1)
i)State giving reason which two elements will show similar chemical
properties.

D. Do as directed. (4)
a) Noble gases like Helium, Neon and Argon were discovered much later than
other gases. Give reason.
b)The atomic numbers of some elements are given below:
{ A=3 B=11 C=19 D= 37 }
i)Which of the above element belongs to the 3rd period?
ii)To which group of the periodic table do the above elements belong?
c)In the Second Period of periodic table elements are placed in the
increasing order of atomic number.

Arrange the given elements in an increasing order of their atomic radii.
{Oxygen= At. No. 8 , Fluorine=At. No. 9 , Nitrogen=At. No. 7 }

d)After suffering from severe head injury in an accident, Karishma a
student of class IV lost her sense of smell and hearing. Also, It was
noticed that she was not growing in height.
i) Which part of the brain controls smell and hearing?
ii) Name the gland which was damaged and resulted in stunted (prevented)
growth?

Q2A. Match the items in column B with those in column A. (1)

Column A Column B
(a)Cranial nerves. Skin
(b)Olfactory receptors. Brain
Spinal Cord
Nose

B. a) Give one point of difference between sensory neuron and motor neuron. (1)
b) Why do multicellular organisms need a chemical communication in addition
to the nervous system? (1)

C. Observe the following figure showing Magnetic field lines around a bar
magnet and answer the following questions. (3)

a) What is the direction of the magnetic field lines inside the magnet?
b) Why do the iron filings arrange themselves in a pattern as shown in the figure, If
you sprinkle them uniformly around the magnet?
c) No two magnetic field lines are found to cross each other. Give reason.

OR

C. Observe the following figure showing magnetic field lines around a straight
conducting wire and answer the following questions. (3)

a)Name the rule used to find direction of magnetic field due to a straight current-
carrying conductor?

b) What happens to the deflection of the compass needle placed at a given point if
the current in the copper wire is reversed?
c) State any two factors on which the magnetic field at a point due to a current
carrying conductor depends on.

D. Answer the following questions: (4 )
a) How do nervous/electrical impulses cross the gap between the two neurons?
b)The metallic body of a microwave is connected to the earth wire.Why?
c) What are fossils?
d) Experiences of an individual during its lifetime cannot be passed to its progeny.
Give reason.

Q3A.Observe the correlation in the first pair and complete the second pair.(1)
a)Electric power : Watt :: Electric charge : ________________
b)Joules Law of Heating : H=I2RT :: Ohms Law : ____________

B. a)What factors could lead to the rise of a new species? (1)
b) The sex of the child is determined by the father.Give reason. (1)

C. Answer the following questions: (3)
a) What are biodegradable substances?
b) Arrange the following organisms so as to make a four-step food chain.
( Snake, Plant, Frog, Grasshopper )
c) Why is production of CFC’S stopped internationally?

D. Do as directed: (4)
a) Draw a circuit diagram as described below:
Connect three resistors R1,,R2 and R3 in series with ammeter and plug key,
insert a voltmeter across the resistors, show the direction of flow of current.
b) If the resistances of the above resistors are 5ῼ, 10ῼ and 15ῼ, then Find the
total resistance in the above circuit.
c) Why is it not practical to connect an electric bulb and an electric geyser in
a series connection?
OR
D. Do as directed: (4)
a) Draw a circuit diagram as described below:
Connect two resistances R1,& R2 in parallel & connect them with a battery,
ammeter and a plug key, Insert a voltmeter across the resistors, show the
direction of current.
b) If the resistances of the above resistors are 4ῼ, and 16ῼ, then find the total
resistance in the above circuit.
c) Filament of an electric bulb should be thermally isolated as much as
possible using insulating support. Why?

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SECOND TERM EXAMINATION
ANSWER KEY
SUB: SCIENCE TOTAL: 30 MARKS TIME: 75Min.
***************************************************************************

Q1A)a) Ketone (½ mk)
b) C6H12 (½ mk)

B a) In order to conduct electricity, a compound must have free-flowing electrons,
in which carries the electrical flow hence makes the compound conductible.
Covalent compounds are formed on the basis of sharing electrons. When the
electrons are shared within the bonds, there is no electrons available to
conduct electricity. Hence covalent compounds are generally poor conductors
of electricity. (1 mk)
OR
In covalent compound there are no free electrons due to sharing of
electrons. (½)
Hence, there are no charged particles to conduct electricity. (½)
b) BUTANOIC ACID (1 mk)

C a) i) It is possible to convert unsaturated hydrocarbons to saturated hydrocarbons
by an addition reaction in which hydrogen is added to unsaturated
hydrocarbon in the presence of a catalyst such as nickel/palladium which
break double or triple bond to form saturated hydrocarbon. (1 mk)

b) Most of the carbon compounds give a lot of heat and light when burnt in
air.
Saturated hydrocarbons burn with a clean flame and no smoke is produced.
The carbon compounds, used as a fuel, have high calorific values. Therefore,
carbon and its compounds are used as fuels for most applications.
( Any two points --- (½ mk + ½ mk)
c) i)X and Y will show similar chemical properties (½ mk)
As both elements have the same number of valence electrons i.e.,2 (½ mk)
D. a) Because: -
they were inert (not reactive) and present in extremely low concentrations
in our atmosphere.
(2 points ½ + ½ )

b) i)Element B (½ mk)
ii)Group I (½ mk)

c) F < O < N (1 mk)
Oxygen (8), fluorine (9) and nitrogen (7) belong to the same period
( 2nd period) of the periodic table, in the order nitrogen, oxygen and
fluorine. Now in a period, on moving from left to right the atomic radius
of the elements decreases. Therefore, the atomic radius of nitrogen is

the largest.

d) (i)Cerebrum (½ mk)
(ii)Pituitary gland. (½ mk)

Q2A a) Brain (½ mk)
b) Nose. (½ mk)

B-(a) Sensory neurons: transmit impulses from the receptors to the central
Nervous system.
Motor neurons: carries information from the central nervous system to the
muscles or effector cells. (½ mk + ½ mk)

(b)Because: -
Firstly, nervous signals/electrical impulses reach only those cells that are
connected by the nervous tissue.
Secondly, once an electrical signal is generated in a cell and transmitted the
cell will take some time to reset its mechanism before it can generate and
transmit a new impulse.
Cells cannot continuously create and transmit electrical impulses.
In chemical communication, stimulated cells release chemical compounds
which can reach all the cells of the body regardless of nervous connections
and it can be done steadily and persistently
Any 2 points --- (½ + ½)

C. a) South pole to its north pole . (1)

b) The magnet exerts its influence in the region surrounding it( Magnetic field).
The iron filings experience a force .The force thus exerted makes iron filings
to arrange in a pattern. (1)

c) If two field lines cross it would mean that at the point of intersection, the
compass needle would point towards two directions, which is not possible. (1)

OR

C.a) Right-Hand Thumb Rule (1)
b) Deflection in the needle also changes/reverses. (1)
c) i) Strength of the current (½)
ii) Distance of the point from the conductor. (½)

D) a)At the end of the axon the electrical impulses release some chemicals these
chemicals cross the gap or synapse and start a similar electrical impulse in
the dendrite of the next neuron. (1)

b) Earth wire provides a low resistance conducting path for the current.It ensures
that any leakage of current to the metallic body of the appliance keeps its
potential to that of the earth,and the user may not get a severe shock.(½ + ½ )

c) All preserved traces of living organisms are called fossils. (1)
OR

All dead remains of plants and animals which lived in the past.

d)Experiences during lifetime are a change in non-reproductive tissues and cannot
be passed on to the DNA of the germ cells. (1)

Q3A. a) Coulomb ( ½ mk)
𝑣
b) V=IR OR =𝑅 ( ½ mk)
𝐼
B.a) genetic drift, natural selection . ( ½ + ½ )

b) All children will inherit an X chromosome from their mother regardless of
whether they are boys or girls. Thus, the sex of the child will be determined
by what they inherit from their father. A child who inherits an X chromosome
from her father will be a girl, and the one who inherits a Y chromosome from
him will be a boy. (1mk)

C.a) Substances that are broken down by biological processes are said to
be biodegradable substances. (1mk)
b) plant Grasshopper Frog Snake (1mk)

c) The amount of ozone in the atmosphere began to drop sharply in 1980
( depletion of ozone layer) due to use of CFC’S, since ozone shields the
surface of the earth from ultraviolet rays coming from the sun. (½+½)

D. a) Correct circuit diagram ----(1 ½ mks)
Correct direction of current ---(½ mk)
b) R1 =5ῼ, R2 = 10ῼ, R3 = 15ῼ

Rs = R1 + R2 + R3

= 5ῼ +10ῼ + 15ῼ ( ½ mk)
= 30ῼ (½ mk)
c)Because they need current of widely different value to operate
properly. (1mk)
OR

D.a)Correct circuit diagram --------(1 ½ mks)
Correct direction of current -------- ( ½ mk )
b) Rp =? R1 =4ῼ, R2 = 6ῼ
1 1 1
= +
𝑅𝑝 𝑅1 𝑅2
1 1 1
=4+6 ( ½ )mk
𝑅𝑝

Rp = 2.4ῼ ( ½ )mk

c)When electric current flows through the filament it gets heated to a very
high temperature and emit light, to prevent loss of heat by conduction
the filament should be thermally isolated. (1mk)
OR
The filament must retain as much of the heat generated as is possible, so that
it gets very hot and emits light.

***********************************************************

SCIENCE SUBJECT CODE: S - 1031

Total No. Of Questions : 3 Max.mks : 30

Time : 75 mins

INSTRUCTIONS
1) The Question paper comprises of 3 questions of 10 marks each.
2) All questions are compulsory
3) There is no overall choice ,however internal choice has been provided in one
question of 3 marks and one question of 4 marks category .You have to attempt
only one option in such questions.
4) Begin each main question on a fresh page.
5) Figures to the right indicate full marks.

Q1A) Select the most correct alternative given below each statement and write the
completed statement : (1)
i) Electrical impulses release some chemicals which cross the gap called ______ to
the next neurons.
● Cyton
● Axon
● Synapse
● Nerve ending

ii) The Peripheral Nervous System consists of ___________ nerves.
● Cranial and sensory
● Cranial and spinal
● Motor and spinal
● Optic and sensory

B) Answer the following (2)
i)Name the following :

a) The hormone that regulates carbohydrate, protein and fat metabolism in the body.
b) The site of Reflex actions

ii) Reflex Arcs are evolved in a tiger . Give scientific reasons.

C) Attempt the following questions (3)
i) How do muscle cells change their shape in response to nervous electrical
impulses?
ii) After an accident Hitesh could not remember what actually happened. Which part
of his brain did he damage? Justify your answer.
iii) If DDT were to enter the following Food Chain,
ALGAE → TADPOLE ---> SMALL FISH ---> HERON
a)In which trophic level would it be maximum?
b) What is the scientific term for this occurrence?

D) Answer the following questions (4)
i) Sama noticed that her baby inherited her blue eyes but did not inherit the scar she had
developed on her face due to a fall. Give scientific reasons for the same.
ii) The age of a fossil of a wooly mammoth was determined according to its position on
discovery. How was the age estimated?
iii) State two ways by which new species of parrots could be developed.
iv) In a monohybrid cross between round and wrinkled seeds in Pea plant, all plants in
the F1 generation were of the round type. Which are the recessive and dominant traits in
the above example.

Q2 A) Select the most correct alternative from the choices given below and write the
completed statement (1)

i) The number of single bonds present in one molecule of methane is ____
● 4
● 5
● 6
● 7

ii) Subsequent members of a homologous series differ by a mass of _____
● 18 u
● 16 u

● 14 u
● 12 u

B )Answer the following questions (2)

i)Mendeleev concentrated on compounds formed by elements with oxygen and
hydrogen.
Why did he select oxygen and hydrogen for the formation of compounds?

ii) If an element A has atomic number 9. State the group it belongs to and its
valency.

C ) Attempt the following (3)

i) V, W ,X, Y and Z are elements with atomic numbers 11,12,16,17 and 18
respectively, belonging to the third period of the Modern Periodic Table
a. Which of the above elements has the largest atomic size.
b. Name the chemically inert element
c. Why is W less metallic than V?

ii). Producers form the first trophic level in all food chains. Give Scientific
Reasons

OR

i) P,Q,R,S and T are elements with atomic numbers 3,4,6,7 and 8 respectively ,
belonging to the second period of the Modern Periodic Table.
a. Which of the above elements is most electropositive in nature.
b. Name the chemically inert element.

c. Why is R smaller in size than P?

ii) The flow of energy in a food chain is unidirectional. Give Scientific Reasons

D) Attempt the following (4)

i) Carbon does not gain 4 electrons to form C-4 anion. Explain
ii)Benzene is a poor conductor of electricity. Give Scientific Reasons

iii)Write the structural formula of Butanoic acid
iv)Name the following compounds
a) CH3COCH3
b) C3H7OH

Q3A . Select the most appropriate alternative from those given below and write the
completed statement (1)

i) The S.I unit of electric charge is ______________.
● Ampere
● Coulomb
● Watt
● Volt
ii)An electric motor converts _________________.
● mechanical energy to electrical energy
● electrical energy to mechanical energy
● kinetic energy to potential energy
● electrical energy to potential energy

B . Answer the following questions (2)
i) Name the following
a) A coil of many circular turns of insulated copper wire wrapped closely in the
shape of a cylinder.
b) An Element used in making bulb filaments
ii)Magnetic field produced by a circular conducting coil becomes stronger with an
increasing number of turns . Give reasons.

C . Answer the following (3)
i)State Flemings Left hand Rule .
ii) Ozone is a deadly poison

a)Write the full form of CFC’s
b)State one harmful effect of UV radiations

iii) Write down one function of a fuse in a domestic electric circuit.

D. Answer any one of the following (4)
i) Four resistors of 2 ohms , 3 ohms, 3 ohms and 4 ohms are connected in series and this
combination is connected to the battery of 6V .An ammeter and a voltmeter are also
connected in the circuit.
a) Draw a circuit diagram to connect all the given devices in the proper order.
b) Calculate
(i) The current flowing through the circuit
(ii) The potential difference across the resistor of 2 ohms.

OR

i)Three resistors of 15 ohms , 30 ohms and 90 ohms are connected in parallel and this
combination is connected to a battery of 12V. An Ammeter and Voltmeter are also
connected in the circuit.
a) Draw a neat circuit diagram of all the given devices in the proper order
b) Calculate
(i) the effective resistance
c) Electric bulbs are usually filled with chemically inactive gases like nitrogen and
Argon. Justify.

ANSWER KEY

Q1A) i) Synapse (½)

ii) Cranial and spinal (½)

B)
i)
a) Thyroxin (½)
b) Spinal cord (½)
ii) Reflex Arcs are evolved in animals like tiger because the thinking process of the
brain is not fast enough. (1)

C)

i) Muscle cells have special proteins that change their shape and arrangement in
response to nervous electrical impulses. (1)
ii) Hitesh could have damaged his Cerebrun as he did not remember what actually
happened. The Cerebrum controls Intelligence and memory (1).
iii) (1)
a)Heron
b)Biological Magnification
D)

i) Colour of the eye is an inherited trait and is carried by the genes, while the scar is an
acquired trait and does not pass through the genes. (1)
ii) The age of a fossil depends upon the layer of snow or mud it is found in.The deeper
the layer the more ancient it is, while if it is found in a higher layer, it is more recent .(1)
iii) New species can be found by Natural selection and Genetic drift. (1)
iv) The Recessive trait is Wrinkled
The Dominant trait is Round (1)

2A). i) 4 (½)
ii) 14 u (½)

B) i). Mendeleev selected hydrogen and oxygen as they are very reactive and
they form compounds with most elements. (1)
ii). Group 17 and valency is 1 (1)

C i) a. V (½)
b. Argon (½)
c. Metals tend to lose electrons . As we move across a period the effective
nuclear charge increases and the tendency to lose electrons decreases. (1)

ii). In a food chain the producers prepare their own food using the sun's energy
and make it available for the subsequent levels in a food chain. (1)

O

C i) a. P (½)
b. Neon (½)
c. R is smaller than P since the effective nuclear charge increases across a period
which pulls the valence electrons closer to the nucleus decreasing the size of the atom.
(1)

ii) The flow of energy in a food chain is unidirectional as the producers capture
the suns energy. No fraction of this energy is reverted back to the sun and only 10
percent of the energy is passed on to the next primary consumer. The energy transferred
to a higher trophic level is never available to the lower trophic level. (1)

D. i) Carbon does not gain electrons to form an anion as it would be difficult for the
nucleus with 6 protons to hold on to 10 electrons ie. 4 extra electrons (1)

ii) Benzene is a covalent compound that is formed by sharing electrons between the
atoms and no charged particles are formed. (1)

iii) (1)

iv) a. Propanone (½)

b. Propanol or propyl alcohol (½)

3. A.
i) Coulomb. (½)
ii) electrical energy to mechanical energy. (½)

B. i) a) Solenoid (½)
b) tungsten (½)

ii) Magnetic field produced by a circular conducting coil becomes stronger with
increasing number of turns because current in each circular turn has the same direction in
the field and is just added up. (1)

C. i)Flemings left hand rule states that stretch the thumb, fore finger and middle finger of
your left hand, such that they are mutually perpendicular to each other ; if the first finger
points in the direction of the magnetic field in the second finger in the direction of the
current then thumb will point in the direction of the motion or the force acting on the
conductor. (1)

ii) a) Chlorofluorocarbons (½)
b) The UV rays or the ultraviolet radiations from the sun is highly damaging to
organisms it is known to cause skin cancer in human beings. (½)

iii) A fuse in a domestic circuit has a low melting point, when excess current pases
through it, it melts and prevents damage to the appliances and the circuit due to
overloading. (1)

D. a) Fig 12.6 Pg 226 (4 resistors in series) (2)

b) i) Rs = R1 +R2+R3+ R 4
=2+3+3+4
= 12 ohms
V= IR
6 = I x 12

I = 6 /12
I = O.5 A (1)

ii) V= IR
V= 0.5 x 2
=1V (1)

OR

D. a) Fig 12.7 Pg 227 (2)

b) i) Rp= 1/R1 + 1/R2 + 1/R3 (1)
= 1/ 15 + 1/30 + 1/90
= 9 ohms

c) Electric bulbs are usually filled with chemically inactive gases like nitrogen and Argon
to prolong the life of the filament. (1)

SCIENCE MODEL QUESTION PAPER
SUBJECTIVE TEST (30MKS)
Instructions :- 1) The question comprises of 3 questions of 10 marks each.
2) All questions are compulsory.
3) There is no overall choice. However internal choice has been provided
In one question of 3 marks and one question of 4marks category. You have
To attempt only one option in such questions.
4) Begin each new question on a fresh page.
5) Figures to the right indicate full marks.
----------------------------------------------------------------------------------------------------------------
1 (A) Select the most appropriate alternative from those given below each
statement and rewrite the complete statement. 1
(i) Dwarfism is caused due to _____
• Excess secretion of growth hormone
• Less secretion of adrenaline
• Excess secretion of adrenaline
• Less secretion of growth hormone
(ii) In a nerve cell the information is acquired at_______
• Axon
• Dendrite
• Nerve ending
• Cell body
(B) The brain and spinal cord constitute the central nervous system of
the human beings. 2
i) State the function of cerebellum in the brain.
ii) Injury to the medulla in brain results in sudden death. Give reason.
(C) (i)Hormones produced by the endocrine system constitutes one way of
control and coordination in our body. 3
a) How is the amount of hormone secreted in the body regulated?
b) What are reflex arcs?
(ii) Write the structural formula of cyclohexane.
(D)(i) Observe the correlation between the first pair and complete the second

pair. 4
(a) Alcohol: -OH:: Carboxylic acid:___

(b) Ethene: C2H4:: Butene: _____
(ii) CHO group cannot be present in the middle of a chain. Give reason.
(iii) Observe the structural formula given below and answer the following
questions:

H

H C C C H
H

(a) Name the above compound.
(b) Why is the above compound called an unsaturated hydrocarbon?
(iv) Differentiate between saturated and unsaturated hydrocarbons with
reference to their general formula.

Q2. A Observe the correlation in the first pair and complete the second pair.(1)
(i) Natural ecosystem: Forest:: Artificial ecosystem: -------
(ii) Plant: Producers :: Herbivores:--------
B Answer the following: (2)
(i) Give one point of difference between Watt and Volt.
(ii) Why is an inert gas like Argon filled in bulbs?
C Attempt the following: (3)
i) Draw a neat circuit diagram of Electric Circuit comprising of three cells,
Ammeter, a plug key, two bulbs in parallel and a voltmeter across the
combination.
ii) A wire having a resistance of 27Ω is cut into three equal pieces. what is
the equivalent resistance if these three pieces are joined in parallel?
OR

C Attempt the following: (3)

i) Draw a neat circuit diagram of Electric Circuit comprising of four cells ,
Ammeter, a plug key, three bulbs in series and a voltmeter across the
combination.
ii) An electric bulb draws 1.2A current at 6.0V. Find the resistance of the
bulb?
D Elements in the Modern Periodic Table are arranged in groups and
periods. (4)
i) In the following table elements A, B, C and D with their atomic numbers
are given. with reference to the information answer the questions.
period Group I Group II
2 A (3) C (4)
3 B (11) D (12)
a) What is the electronic configuration of element D?
b) What is the valency of element B?
ii) . Write any one criteria used by Mendeleev in creating his periodic
table?
iii) Why Silicon is classified as metalloid?

Q 3A] Match the correct items in column B with that in column A. (1)

Column A Column B
(i) Herbivore - Man
(ii) Carnivore -Goat
-Algae
-Tiger

B] i) Why are magnetic field lines crowded near the North and South Pole? (1)

ii) How does the earth wire work as a safety measure? (1)

C] i) One of the major cause of fire in office building is short circuiting.

List any two factors which may lead to short circuit. (1)

ii). Magnetic field lines of two magnets are shown in fig. A and fig. B.(1)

Select the figure that represents the correct pattern of field lines. Give reasons
for your answer.
iii) Grass→Rabbit→Fox→Lion (1)
Name the producer and the secondary consumer in the above food chain.
D] i) The inbuilt tendency for variation during reproduction is the basis
for evolution. (2)
a) How does speciation occur? (explain with reference to beetles)
b) Certain factors could lead to the rise of new species.
Name any two factors.
ii) Traits acquired during the lifetime of an individual are not inherited.
Give reason. (1)
iii) Mendel took tall pea plant and short pea plant and produced F1
progeny through cross-fertilization. What did Mendel observe in the
F1 progeny? (1)
OR
D] i) The family was happy when a male child was born after two female

Children. (2)

a) Which pair of sex chromosomes determine the male sex and female sex
of the offspring?
b) How does an X chromosome differ from a Y chromosome in size?
ii) Name the total number of pair of chromosomes present in the human
beings and also specify them. (1)
iii) Give one rule of inheritance given by Mendel. (1)
-----------------------------------------------------------------------------------------------

Answer key
Q1A) (i) less secretion of growth hormone
(bii dendrite
B) (i) Cerebellum is responsible for the precision of voluntary action and
maintaining the posture and balance of the body.
(ii) Medulla controls all involuntary actions including blood pressure &
heartbeat. Hence injury to medulla causes instant death.
C) (i) (a) The timing and amount of hormones released in the body is regulated
by feedback mechanism.
(b) The process of detecting a signal or input and responding to it quickly
without thinking by an output action is known as reflex arc.
(ii) page 69 fig 4.9(b)
D) (i) (a) -COOH

(b) C4H8
(ii) In the middle of the chain valency of carbon is already satisfied hence -CHO
group cannot be added in the middle of a carbon chain.
(iii) (a)Propyne
(b) since it has triple bonds, it is called unsaturated hydrocarbon.
(iv) General formula of saturated hydrocarbon is CnH2n+2 and Unsaturated
hydrocarbon is CnH2n or CnH2n-2
Q2. A.(i) gardens or crop fields (any other correct answer)
(ii) primary consumers/consumers
B. (i) watt is the SI unit of electric power and volt is the SI unit of electric
potential difference
(ii) 1) filament does not burn 2) life of filament is prolonged

C (i ) correct circuit diagram
direction of the current

ii) Resistance of each piece 27/3=9 Ω
since parts are joined in parallel
1/R=3/9
R=3 Ω
OR
i) a. correct circuit diagram
b. direction of the current
ii) R=V/I
R= 6.0/1.2
=5 Ω
D (i) a) (2,8,2)
b) Valency 1
(ii) properties of hydroxides and oxides of elements or atomic mass
(iii) Silicon exhibits some properties of both metals and nonmetals.
Q3A. (i) Goat
(ii) Tiger
B] i) It is because the magnetic field is strongest at the two poles of
a magnet.
ii) The earth wire is connected to the metallic body of a appliance to provide
low resistance path for current to flow to the earth. If there is any leakage of
current to the metallic. it will flow to the earth through the earth wire and the
user will not get severe shock.
C] i). Short circuit may occur
when the live wire and the neutral wire come into direct contact.
When there is a fault in the appliance.
ii) Figure B represent the correct pattern of field lines.
In figure A, field lines cross each other which is not possible because if

they cross each other, at the point of intersection, there would be

two directions of field lines.
iii) Producer- Grass
Secondary consumer- Fox
D] (i) (a) If there is no reproduction between the red and the green beetles due
to the change in the number of chromosomes, two new species of beetles are
generated.
(b) Natural selection.
Genetic drift
(ii) Traits acquired during lifetime are a change in non-reproductive tissues
and not a change in the reproductive tissues and DNA of reproductive
cells.
(iii) In F1 Progeny were all Tall plants.
OR
D] (i) ( a) The combination of X and Y chromosomes produces a male child
and
a combination of X and X produces a female child.
b) Y chromosome is shorter than the X chromosome.
ii) Total 23 pair of chromosomes.
22 pair of chromosomes similar in males and females and 1 pair is the
sex chromosome (22+1)
iii) Mother and father contribute equal amount of genetic material to the
offspring.
Each trait has two versions dominant or recessive and were influenced by
both the parental DNA.
Each trait was inherited independently. (any one)
--------------------------------------------------------------------------------------------------------

Std X SCIENCE March – April 2022

Q I A) Select the appropriate alternative from those given below each statement and
write the completed statement: (1)
1. The number of covalent bonds in the molecule of butane is ______
a) 13
b) 4
c) 10
d) 9

2. The functional group present in is __________
a) Ketone
b) Aldehyde
c) Alcohol
d) Carboxylic acid

Bi). Carbon has a unique property to form bonds with other atoms of carbon (1)

a) Name the characteristic property of carbon as depicted in the above figure.
b) Name the following compound

ii) Differentiate between alkanes and alkenes with respect to (1)
a) general formula
b) bonding between the carbon atoms

C i) Sita was advised by her doctor to take less sugar in her diet. (3)
a) Name the disease that she is suffering from.
b) Name the hormone that causes this imbalance.

ii) Most salt packets available in the market have ‘iodised salt’ written on them.
What happens if we do not consume sufficient iodised salt in our diet?

iii) State the function of the cerebellum.

OR
C ) i) The pituitary gland secretes the growth hormone. What will be the effect of the
following on a person in the following cases: (3)
a) Deficiency of the growth hormone
b) Excess secretion of the growth hormone.

ii) The spinal cord is a vital organ of our body. How is it protected?

iii) Reflex arcs are evolved in animals. Give reason.

D) Attempt the following: (4)
1. Many carbon compounds exhibit a homologous series.
a) Write the name and the formula of the second member of the alkane series.
b) State any two characteristics of a homologous series.

2.. Draw a neat structure of a neuron and label
(a) dendrite (b) axon

Q II A) Select the correct alternative from those given below each statement and
write the completed statement: (1)
a) Which of the following is an artificial ecosystem?
• Pond
• Crop field
• Lake
• Forest

b) Flow of energy in an ecosystem is always ________
• Unidirectional
• Bidirectional
• Multidirectional
• Having no specific direction

B 1) The electronic configuration of two elements X and Y are 2,8,7 and 2,8,8,3
respectively. Write the atomic numbers of X and Y. (1)

2..) The atomic radius of elements decreases across a period. Give reason. (1)

C 1. In the following table, the positions of six elements are given as they are in the
Modern Periodic Table (1)
Groups
1 2 3 -12 13 14 15 16 17 18
Periods
2 A B C D
3 E F

a) Name the element which is a non-metal with valency 3.
b) Write the common name for the group to which the elements D and F belong.

2.. An element X has atomic number 16 and mass number 32. Write to which Group
and Period of the Modern Periodic Table it belongs to. (1)

3. Observe the correlation in the first pair and complete the second pair. (1)
a) Charge : Coulomb :: Power : _________
b) Voltmeter : Potential difference :: Ammeter : _______

D 1. Observe the given figure and answer the following: (4)

Calculate
i) The equivalent resistance of the circuit
ii) The current flowing in the circuit

2. Fairy lights used to decorate a Christmas tree are connected in series. Write the
disadvantages of using a series circuit.

3.. State any two factors on which the resistance of a conductor depends on.

OR (4)
D 1. Amongst iron, silver, nichrome, tungsten and copper, which metal/alloy should
be used to make the

a) Heating element of an electric geyser.
b) Filament of an incandescent bulb

2. An electric iron has a rating of 750 W , 220 V. Calculate
a) the current used by the iron
b) its resistance when in use

3.. Electric bulbs are usually filled with chemically inactive nitrogen and argon gas. Give
reason.

Q III A) ) Select the correct alternative from those given below each statement and
write the completed statement:
Name the following: (1)
a) Exchange of genetic materials takes place place in.......
Vegetative reproduction
Asexual reproduction
Sexual reproduction
Budding

b) Mendel”s dihybrid ratio is .........
2:1 , 2:1:1 , 9: 3 :3 : 1 , 9: 3: 1.

Bi) Sachin was a famous footballer, but his son excelled in music. (1)
Why were Sachin’s skills not seen in his son?

ii) A pea plant with a blue colour (BB) is cross-bred with a pea plant with white
flowers (bb). (1)
a) What is the expected colour of the flowers in the F 1 progeny?
b) What will be the ratio of the blue to white flowers if the F1 progeny are self-
pollinated?

C) Attempt the following: (3)
(i) The father is responsible for the sex of the offspring.
a) Name the sex chromosomes present in the males.

b) State the number of pairs of chromosomes in a human body.
(ii) Given below are some organisms in an ecosystem.
Hawk, tiger, plants, mice , dragonfly

a) Create a three step food chain using any of the above given organisms.
b) Producers always occupy the first trophic level of any food chain. Give reason.

D (i). Observe the given figure and answer the question given below. (1)

The magnetic lines of force are crowded near the two poles of a magnet. Why?

(ii) What is a solenoid? (1 )
(iii) Most electrical appliances are provided with an earth wire. Give reason (1)
(iv) Write any two causes of overloading in a circuit. (1)

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Std X

Science Model Answer Key

Q I A ) 1. 13 ( ½ )
2. Carboxylic acid (½)

B. i) a. catenation (½)
b. benzene (½)

ii) ( ½ + ½ )
Alkane Alkene
a) General formula is CnH2n+2 . a. General formula is CnH2n
b) Single bond between carbon atoms b.) double bond between carbon atoms

C i) a. Diabetes (½)
b.. Insulin (½)

ii) If we do not consume sufficient iodised salt, it would lead to a deficiency in
iodine which could then lead to goitre. (½+½)

iii) The function of the cerebellum: (½+½)
a) It is responsible for the precision of voluntary actions
b) It maintains the posture and balance of the body.
OR
C i) a. Dwarfism (½)
b. Gigantism ( ½ )

ii) The spinal cord is protected by the vertebral column ( 1)

iii) The reflex arcs are evolved in animals because the thinking process of the brain
is not fast enough. (1)

D 1. a. Ethane C2H6 (½ +½)
b.. (i) in a homologous group, the carbon compounds differ by a -CH2 unit
(ii) All members have the same functional group
(iii) All members have similar chemical properties
(iv) There is a gradation in the physical properties (any 2) ( ½ + ½ )

D 2.

Drawing ( 1 mark)
Labelling ( a) dendrite and (b) axon (½+½)

Q II A) a) Crop field (½)
b.) Unidirectional ( ½ )

B 1) The atomic number of X is 17 and atomic number of Y is 21 ( ½ + ½ )
2) The atomic radius of elements decreases across a period because electrons are

added to the same shell. So the attraction between the nucleus and the valence shell
increases due to which the outermost shell is pulled in closer to the nucleus. ( ½ + ½ )

C 1. a) Element C ( ½)
b.) Noble gases / inert gases ( ½ )

2. The electronic configuration of X is 2,8,6
Therefore it belongs to Group 16 and 3rd period (½+ ½)

3. a) Watt (½)
b) Electric current ( ½ )

D 1. 1/Rp= 1/8 + 1/8 = 2/8 = ¼
Therefore Rp = 4Ω
(i) Resistance of the circuit = R1 + Rp = 6Ω + 4Ω = 10 Ω (1 mark)

(ii) Current flowing I = V/R = 12 V/ 10Ω = 1.2 A ( 1 mark)

2. (i) Different components need different currents for their efficient functioning.
Hence in a series circuit, the current flowing through the different appliances will be
the same.
(ii) if one of the components of the series circuit fails, the circuit is broken and none
of the components work. (½+½)
OR
D 1. (a) Nichrome ( ½ )
(b) tungsten ( ½ )

2. a) P = 750 W , V = 220 V
P = VI
Therefore I = P/V = 750 W / 220 V = 3.4 A ( 1mark)

b.) R = V/I = 220 V / 3.4A = 64.5 Ω ( 1 mark)

3. Electric bulbs are usually filled with chemically inactive nitrogen and argon gas to
prolong the life of the filament. (1)

Q III A a) sexual reproduction ( ½ )

b.) 9:3:3:1 (½)

B i) Playing football is a skill that is acquired by a person during one’s lifetime and are
thus known as acquired traits and hence do not cause any changes in the reproductive
tissues of an individual, therefore, these traits cannot be passed on to the DNA of the
germ cells and are not inherited by the next generation. ( ½ + ½ )

(ii.) a) All blue flowers ( ½ )
b.) Ratio of blue to white flowers is 3:1 (½)

C (i) (a) X and Y (½)
(b) 23 pairs (½)

(ii.) a) Plants mice hawk ( 1)
b.) Producers always occupy the first trophic level of any food chain because they
depend on the sun to produce their own food. (1)

D (i) The magnetic lines of force are crowded near the two poles of a magnet because
the magnetic field is stronger at the poles. (1)

(ii.) A solenoid is a coil of many circular turns of insulated metallic wire wrapped
closely in the shape of a cylinder. (1)

(iii) Most electrical appliances are provided with an earth wire because the earth
wire provides a low resistance conducting path for the current.
In case of any leakage of current to the metallic body of any appliance, the
earth wire allows the current to flow into the earth and the person is saved
from electrical shock (½+½)

(iv) The causes of overloading in a circuit are ( ½ + ½ ) ( any 2)
a) When the live wire and the neutral wire come into direct contact.
b) An accidental hike in the supply voltage
c) By connecting too many electrical appliances to a single socket.