JKBOSE 8th Class Model Paper 2023 Science

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Summative Assessment

Model Paper for Class 8th

Subject: Science Max. Marks: 40 Time allowed: 2 ½ Hours
Learning Outcomes: The Learner

✓ SCI809- draws labelled diagram/ Flowchart, e.g., structure of cell, eye, human
reproductive organs; experimental set ups. etc.
✓ SCI807- measures angles of incidence and reflection, etc.
✓ SCI805- explains processes and phenomenon, e.g., reproduction in human and animals;
production and propagation of sound; chemical effects of electric current; formation of
multiple images; structure of flame, etc.
✓ SCI811- applies learning of scientific concepts in day to-day life, e.g., purifying water;
segregating biodegradable and non-biodegradable wastes; increasing crop production;
using appropriate metals and non-metals for various purposes; increasing/ reducing
friction; challenging myths and taboos regarding adolescence, etc.
✓ SCI713- applies learning of scientific concepts in day-to-day life, e.g., dealing with acidity;
testing and treating soil; taking measures to prevent corrosion; cultivation by vegetative
propagation; connecting two or more electric cells in proper order in devices; taking
measures during and after disasters; suggesting methods for treatment of polluted water
for reuse, etc.
✓ SCI801- differentiates materials and organisms; such as liquids as electric conductors and
insulators, etc.
✓ SCI804- relates processes and phenomenon with causes, e.g., smog formation with the
presence of pollutants in air; deterioration of monuments with acid rain, etc.

SECTION A: Long Answer Type Questions

Q1) Draw a labeled diagram of human eye and explain its working with the help
of the given figure.

Light enters the eye The pupil adjusts in
light onto the retina
The lens focuses the

through the cornea response to the light

The optic nerve transmits The photoreceptors are
visual information to the made up of rods and cones
brain

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Or

Two mirrors MM′ and NM′ meet at right angles. An incident ray falls on NM′ at
an angle of 40º as shown in figure below.

A

a) What is the angle of reflection of the ray incident on NM′ at an angle of 40º?
b) At which angle the ray reflected by NM′ is incident on MM′?
c) Draw the reflected ray from NM′.
d) Draw the reflected ray from MM′.
e) If an object ‘A’ is placed between these two mirrors, how many images of ‘A’
are formed?

Q2)

a) Match the following
Female gametes Sperm duct

Male organ Asexual reproduction

Binary fission Ova(eggs)

Animals that lay eggs Asexual reproduction

Reproduction in which only a single oviparous
parent is involved

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b) Discuss budding as one of the mode of asexual reproduction with the help of
the given figure.

Or

Draw the flowchart of the events that take place in human fertilization. Explain the
development of zygote to embryo.

( 2 x 5 = 10)

SECTION B: Short Answer Type Questions

Q3) Water is one of the most important natural resource and it is impossible to
live without it. But, we are continuously polluting water which adversely
effects the humans, animals and plants. Write ‘Good’(no colour, odor or taste)
or ‘Bad’ to determine whether the water you are using is polluted or not. Give
one reason of pollution of water in your area and one suggestion of its
prevention. If water in your area does not have any pollution, then, write how
are you saving water bodies of your area from getting dirty.

S. Source /Place Colour Smell Taste
No.

1 Drinking Water in Good/Bad Good/Bad Good/Bad
home

2 Drinking water in Good/Bad Good/Bad Good/Bad
school

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3 Water of any nearby Good/Bad Good/Bad Good/Bad
spring

4 Water of any stream Good/Bad Good/Bad Good/Bad
in your area

Q4) Name three liquids, which when tested in a manner shown in figure below, may
cause a magnetic needle to deflect.

Liquid

Q5) Observe the graph between the applied force on the spring balance and the
force of friction given below. Why the magnitude of dynamic friction is
slightly less than the magnitude of limiting friction?

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Q6) Complete the cross-word puzzle using the hints given below.

ACROSS

1. The process of the fusion of the gametes.

6. The type of fertilization in hen.

7. The term used for bulges observed on the sides of the body of Hydra.

8. Eggs are produced here.

DOWN

2. Sperms are produced in these male reproductive organs.
3. Another term for the fertilized egg.
4. These animals lay eggs.
5. A type of fission in amoeba.

( 4 x 3 = 12)

SECTION C: Very Short Answer Type Questions (Do Any Four)

Q7) Increase in the carbon dioxide content in the atmosphere can make

greenhouse effect life threatening. Comment.

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Q8) Asma made an electric circuit is by using a potato as shown below. Can it
conduct electricity or not? If greenish blue spot appeared on the potato around
the left wire, then which is the negative terminal of the battery used in the
circuit?

Q9) Why you cannot see objects in a dark room.

Q10) What is the nature of the image formed by a plane mirror?

Q11) Why is sewing machine often oiled?

( 4 x 2 = 8)

SECTION D: Objective Type Questions

Q12)
Fill in the blanks with the appropriate words given:

i) Cells present in retina sensitive to bright light are called __________.
ii) The most common supporter of combustion around us is_________ .
iii) The process of depositing a layer of any desired metal on another material by
means of electricity is called ________.

Multiple Choice Questions

iv) One of the disadvantages of friction is:
a) It enables us to walk on ground
b) It causes match stick to lit up

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c) It causes wear and tear in machines
d) It allows the vehicles to move on roads

v) The fusion of male and female gamete is called:

a) Budding
b) Metamorphosis
c) Fertilization
d) Asexual reproduction

vi) The maximum force required to make one body slide over another body is
called:

a) Static friction
b) Limiting friction
c) Dynamic friction
d) Rolling friction

vii) When a ray of light is incident on the mirror normally then the angle of
reflection will be:

a) <r = 0°
b) <r = 90°
c) <r = 180°
d) <r = 45°

viii) You might have seen that the word ‘AMBULANCE’ is written inverted on
the hospital van to convey the vehicle in front of it, that it is an ambulance.
It follows the phenomenon of :

a) Inversion
b) Reflection

c) Refraction
d) Lateral inversion

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ix) The type of reproduction in which only a single parent is involved is called:

a) Sexual reproduction
b) Metamorphosis
c) Asexual reproduction
d) Fertilization
x) The trapping of the radiations of the sun by the earth’s atmosphere is called:
a) Red effect
b) Green effect
c) Greenhouse effect
d) Whitehouse effect (10 x 1 =10)