Class 10 Sample Paper Science (Half Yearly)

SAMPLE
PAPER
Half Yearly Examination

Prepared For
NCERT BASED SYLLABUS
Applicable For
CBSE BOARD AND STATE BOARD USING NCERT

WWW.

HALF YEARLY EXAMINATION
SAMPLE QUESTION PAPER
Class - X Subject – Science
Time – 3 Hours Maximum Marks- 80

General Instructions:

(i) The question paper comprises four sections A, B, C and D. There are 36 questions in
the question paper. All questions are compulsory.

(ii) Section–A - question no. 1 to 20 - all questions and parts thereof are of one mark each.
These questions contain multiple choice questions (MCQs), very short answer

questions and assertion - reason type questions. Answers to these should be given in
one word or one sentence.

(iii) Section–B - question no. 21 to 26 are short answer type questions, carrying 2 marks
each. Answers to these questions should in the range of 30 to 50 words.

(iv) Section–C - question no. 27 to 33 are short answer type questions, carrying 3 marks
each. Answers to these questions should in the range of 50 to 80 words.

(v) Section–D – question no. - 34 to 36 are long answer type questions carrying 5 marks
each. Answer to these questions should be in the range of 80 to 120 words.

(vi) There is no overall choice. However, internal choices have been provided in some
questions. A student has to attempt only one of the alternatives in such questions.

(vii) Wherever necessary, neat and properly labeled diagrams should be drawn.

SECTION A

1. Why is respiration considered an exothermic reaction ? [1]

2. In the refining of silver,the recovery of silver from silver nitrate solution involves displacement
by copper.Write chemical equation involved. [1]

3. What happens when lead nitrate is heated strongly. Write the equation involved.

OR

Complete and balance the following:

CO + H2 340 atm [1]

4. A person needs a lens of -4.5 D for correction of her vision . What kind of defect in vision he is
suffering from and what is the focal length of the corrective lens? [1]

1

5. Draw neat labelled diagram to show the formation of image by a concave lens when an object is
placed in front of it . [1]
OR
Draw neat labelled diagram to show the formation of image by a convex lens when an object is
placed between F and 2F.
6. Name the factor on which the scattering of light depends. [1]
7. An old person is unable to see clearly nearby object as well as distant objects. What defect of
vision is he suffering from and what kind of lens will be required to see clearly the nearby as
well as distant objects [1]
8. Draw a schematic diagram of an electric circuit consisting of a battery of three cells each of
2V, and 5Ὼ, 8Ὼ, 12Ὼ resistors and a plug key, all connected in series along with ammeter and a
voltmeter. [1]
9. The resistance of an electrical component remains constant while the potential difference
across the two ends of the component decreases to half of its former value. What change
will occur in the current through it? [1]
10. How are the parts of CNS protected in our body? [1]
11. How does the food move forward in the alimentary canal?
[1]
OR
What are the adaptations of leaf for photosynthesis?

12. Why have reflex arc evolved in animals? [1]

OR
How the communication between the CNS and other part of the body facilitated?
13. Why plants appear to bend towards light? [1]

For question numbers 14 to 16, two statements are given one labeled
Assertion (A) and the other labeled Reason (R) . Select the correct answer to these
questions from the codes (a), (b ), ( c) and (d) as given below.
(a) Both A and R are true, and R is the correct explanation of the assertion.
(b) Both A and R are true, but R is not correct explanation of the assertion.
(c) A is true, but R is false.
(d) A is false, but R is true.

14. Assertion (A) : The aqueous solution of glucose and alcohol do not show acidic character.
Reason (R): Aqueous solution of glucose and alcohol do not give H+ ions.

15. Assertion : HCl converts pepsinogen into active enzyme pepsin.
Reason: Pepsin converts proteins into proteoses and peptones.
OR
Assertion : Human beings have a complex respiratory system.

Reason: Human skin is impermeable to gases.
16. Assertion : Abscisic acid is growth inhibitor.
Reason: It checks excessive transpiration by closing stomata.
2

17. Read the following paragraph and answer ANY FOUR questions. [1x4=4]
We eat various types of food which has to pass through the same digestive tract. Naturally the
food has to be processed to generate particles which are small and of the same texture .This is
achieved by crushing the food with our teeth.Since the lining of the canal is soft ,the food is
also wetted to make its passage smooth.
17.1 Identify the option that indicates the correct enzyme that is secreted in location L,M
and N.Where L,M and N represent Mouth cavity, Stomach and small intestine of the
human being.
L M N
A lipase Trypsin Pepsin
B Amylase Pepsin Trypsin
C Trypsin Amylase Lipase
D Lipase Amylase pepsin

17.2 When we consume lime juice while eating ,then
(a) Action of ptyalin on starch is enhanced
(b) Action of ptyalin on starch stops
(c) Action of ptyalin on starch is unaffected
(d) Action of ptyalin on starch is reduced.
17.3 Only two of the following statements accurately describe what happens in the mouth
1. Amylase breaks down large starch molecules into smaller maltose molecules.
2. Chewing increases the surface area of food digestion.
3. Saliva emulsifies fats into smaller droplets.
4. Teeth break up large insoluble molecules into smaller soluble molecules.
Which statements are correct?
(a) 1and 2
(b) 3and 4
(c) 2 and 3
(d) 1 and 4
17.4 (i),(ii),(iii) and(iv) represent mouth cavity,liver , first part of small intestine and
completes small intestine respectively of Human digestive system.
Match the labeling reffered in Column I and correlate with the function in Column II
Column I Column II
i a. The length of this depends on the food the organism eats
ii b. Initial phase of starch digestion
iii c. Increase the efficiency of lipase enzyme action
iv d. This is the site of the complete digestion of carbohydrates,
proteins and fats

(a) i- c; ii- d; iii- a; iv-d

(b) i- b; ii-c; iii- d; iv- a
(c) i- a; ii-c; iii –d; iv- b
(d) i-d; ii-a; iii- b; iv-c
17.5 Which is the correct sequence of parts in human alimentary canal?
3

(a) Mouth stomach-small intestine-oesophagus-large intestine
(b) Mouthoesophagusstomachlarge intestine-small intestine
(c) Mouthstomachoesophagussmall intestine large intestine
(d) Mouthoesophagusstomach-small intestinelarge intestine
18. Read the passage given below and answer any four questions [1x4]

Metals are electropositive elements. They can easily lose electrons to form ions. Metals show
distinguished physical and chemical properties. Generally most of the metals are ductile and
malleable.Reaction of a metal with water is one of the important chemical property. Metals
like sodium and potassium react with hot/cold water while magnesium reacts with hot water.
Metals like aluminium ,zinc do not react with hot/cold water but they easily react with
steam. When a metal react with hot/cold water the products are metal hydroxide and
hydrogen and when it reacts with steam , the products are metal oxide and hydrogen. Some
metals like sodium and potassium react violently with water.

1.When zinc reacts with steam it produces
(a) Zn(OH)2
(b) ZnO
(c ) O2
(d) ZnO2
2. During the reaction of calcium with water,pieces of metal start floating due to the formation
of
(a) Ca(OH)2
(b) CO2
(c) H2
(d) none of these
3. Consider the reactions:

Na + H2O → NaOH + H2--------------(i)
Ca + H2O →Ca(OH)2 + H2------------(ii)

(a) Reaction (i)is endothermic reaction
(b) Reaction (ii) is endothermic reaction
(c) Reaction (ii) is more exothermic than reaction (i)
(d) Reaction (i) is more exothermic than reaction (ii)
4. The metals which react with very dilute nitric acid to evolve hydrogen gas
(a) Pb,Cu
(b) Na,K
(c) Mg,Mn
(d) Al,Zn
5. The lustre of a metal is due to

(a) its high density
(b) its high polishing
(c) its chemical inertness
(d) presence of free electrons
4

19. Read the following and answer any four questions from 19 (i) to (v) [1x4=4]
The lenses form different types of images when object placed at different locations. When
a ray is incident parallel to the principal axis, then after refraction, it passes through the
focus or appears to come from the focus.
When a ray goes through the optical centre of the lens, it passes without any deviation. If the
object is placed between focus and optical centre of the convex lens, erect and magnified image
is formed. As the object is brought closer to the convex lens from infinity to focus, the image
moves away from the convex lens from focus to infinity. Also the size of image goes on
increasing and the image is always real and inverted.

(i) The location of image formed by a convex lens when the object is placed at infinity is
(a) at focus
(b) at 2F
(c) at optical center
(d) between F and 2F
(ii) When the object is placed at the focus of concave lens, the image formed is
(a) real and smaller
(b) virtual and inverted
(c) virtual and smaller
(d) real and erect
(iii) The size of image formed by a convex lens when the object is placed at the focus of convex
lens is
(a) small
(b) point in size
(c) highly magnified
(d) same as that of object
(iv) When the object is placed at 2F in front of convex lens, the location of image is
(a) at F
(b) at 2 F on the other side
(c) at infinity
(d) between F and optical center.
(v) At which location of object in front of concave lens, the image between focus and optical
centre is formed
(a) any where between centre and infinity
(b) at F
(c) at 2F
(d) infinity

20. Read the following and answer any four questions from 20 (i) to (v) [1x4=4]
The relationship between potential difference and current was first established by George
Simon Ohm called Ohms law. According to this law, the current through a metallic conductor
is proportional to the potential difference applied between v its ends, provided the
temperature of conductor remains constant that is I is proportional to V Or V= IR; where R is

constant for the conductor and it is called resistance of the conductor. Although Ohm's law has
been found valid over a large class of materials, there do exist materials and devices used in
electric circuits where the proportionality of V and I does not hold. [1 x4 =4]

(i) If the potential difference in a circuit is doubled, then -
5

(a) current remains same
(b) current is doubled
(c) current is halved
(d) current is quadrupled.
(ii) The slope of V - I graph ( V on x- axis and I on y- axis) gives :-
(a) current
(b) resistance
(c) reciprocal of resistance
(d) charge.
(iii) When battery of 9 V is connected across a conductor and the current flows is 0.1 A, the
resistance is :- -
(a) 9 Ohm
(b) 0.9 Ohm
(c) 90 Ohm
(d) 900 Ohm
(iv) By increasing the length of a conductor, the -
(a) resistivity will decrease
(b) resistance will increase
(c) resistivity and resistance will remain unchanged
(d) resistance will decrease.
(v) If the conductor resistance is 50 ohm and the current passing through it is 5 A. What is the
value of potential difference-
(a) 150 V
(b) 250 V
(c) 50 V
(d) 15 V
21. Give reason:- [1+1=2]
(a) Arteries form capillaries
(b)Ventricles have thicker muscular wall than atrium.
OR
(a) What happens if conducting tubes of circulatory system develops a leak?
(b) ”Lymph is another type of fluid involved in transportation.”Justify.

22. Why do multicellular organism need another means of communication between cells besides
nervous coordination? [2]

SECTION B

23. What is rancidity ? Suggest two methods to check rancidity. [2]

24. Why do ionic compounds conduct electricity only in the molten state and not in the solid
state? [2]

OR

What is bleaching powder chemically called?Give a reaction for its preparation .State one of its
use.
6

25. Define the term dispersion of white light. Name the colour of light which bends
(i) the most,
(ii) the least while passing through a glass prism. Draw a ray diagram to justify your answer.
[2]
26. (a) Define the resistivity of material of a conductor and give its SI unit.
(b) Write the factors affecting resistivity of the conductor. [2]

27. Pertaining to endocrine system what will you interpret if [1+1+1=3]
(a) You observe swollen neck in people living in the hills.
(b) Oversecretion of growth hormone during childhood.
(c) Facial hair develops in boys aged 13
OR
An old man is advised to take less sugar in his diet .
(a) Name the disease from which the man is suffering.
(b) Mention the hormone due to the imbalance of which he is suffering from this disease and
state the role of the hormone.
(c) Which endocrine gland secrete this hormone.

28. (a) How transpiration is different from translocation ?
(b) Why do plants have a slow transport system ? [2+1=3]

29. (a)Differentiate between cerebrum and cerebellum
(b)How does a muscle cell move in animals? [2+1=3]

SECTION C

30. (a) What is the chemical name of Plaster of Paris?Write the chemical formula of Plaster of
Paris.
(b) How is Plaster of Paris prepared? Write chemical equation of the reaction involved.
(c) Explain why Plaster of Paris should be stored in a moisture – proof container? [3]

31. In the electrolysis of water : [3]
(a) Name the gas collected at the cathode and anode respectively.
(b)Why is the volume of one gas collected at one electrode double than that at the other?
(c)How will you test the evolved gases?

32. (a) Distinguish between roasting and calcination.
(b) Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure
copper. [2+1]

33. A person is unable to see objects distinctly placed within 50 cm from his eyes. (a) Name the
defect of vision the person is suffering from and how it can be corrected (b) List two possible
causes of this defect of vision. (c) Draw a ray diagram to show this defect of vision and also

draw diagram for the correction of this defect. [3]

SECTION D
7

34. (a) Explain why is hydrochloric acid a strong acid and acetic acid a weak acid?
(b) Explain why an aqueous solution of an acid conducts electricity?
(c) You have four solutions A,B,C and D. The pH of solution A is 6,B is 9,C is 12 and D is 7.

Arrange the above four solutions in the increasing order of H+ ion concentration. [2+2+1]
OR

(a) Why should curd and sour substances not be kept in brass and copper vessels?
(b) What is the role of tartaric acid added to baking soda ?
(c) Name the sodium compound which is used for softening hard water. [2+2+1]

35. (a) Name any two components which are absorbed in the small intestine and again reabsorbed
in the kidney tubules.
(b) On what factor does the amount of water reabsorbed depends?
(c) Draw the structure of a human excretory unit and label the following parts:-
(i) Renal artery
(ii) Bowman’s capsule
(iii) Glomerulus
(iv) Collecting Duct [1+1+3=5]

SECTION- D

36. (a) The image of a candle flame placed at a distance of 30 cm from a mirror is formed on a
screen placed in front of the mirror at a distance of 60 cm from its pole. What is the nature
of the mirror? Find its focal length. If the height of the flame is 2.4 cm, find the height of its
image. State whether the image formed is erect or inverted.
(b) The linear magnification produced by a spherical mirror is +3. Analyse this value and state
the (i) type of mirror and (ii) position of the object with respect to the pole of the mirror.
Draw a ray diagram to show the formation of image in this case. [3+2=5]
OR
(a) State the laws of refraction of light. Explain the term absolute refractive index of a medium’
and write an expression to relate it with the speed of light in vacuum.
(b) The absolute Refractive index of two media 'A' and 'B' are 2.0 and 1.5 respectively. If the
speed of light in medium 'B' is 2.0 × 108 m/s, calculate the speed of light in (i) vacuum (ii)
medium 'A'.

8

AglaSem Earn while Learn Program. Send your papers and get paid.
Contact: support@