Class 8 Question Paper 2024 Science (with Answers)

ANNUAL EXAMINATION

Question Paper
2024

NCERT BASED SYLLABUS
FOR CBSE AND STATE BOARD
FOLLOWING NCERT

Annual Exam Question Paper 2024

SESSION ENDING EXAM (2023-24)
CLASS : VIII SUBJECT:SCIENCE
TIME 2½ HOURS MM: 60

GENERAL INSTRUCTIONS:
1. Section A contains Question no. 1 to 8 MCQ’s of 1 mark each.
2. Section B contains Question no. 9 to 13 are of 2 marks each.
3. Section C contains Question no. 14 to 17are of 3 marks each.
4. Section D contains Question no. 18 to 20 are of 5 marks each.
5. Section E contains CCT Question no. 21to 23 are of 5 marks each.

SECTION A

1. Image formed by a plane mirror is 1
(a) virtual, behind the mirror and enlarged.
(b) virtual, behind the mirror and of the same size as the object.
(c) real at the surface of the mirror and enlarged.
(d) real, behind the mirror and of the same size as the object.

2. The loudness of a sound depends on: 1
(a) its amplitude.
(b) its frequency.
(c) its time period.
(d) its speed.

3. Thyroid gland releases- 1
(a)Adrenaline
(b)Thyroxine
(c)Testosterone
(d)Oestrogen

4. A tadpole develops into an adult frog by the process of- 1
(a)Fertilization
(b)Metamorphosis
(c)Embedding
(d)Budding

5. Ignition temperature is- 1
(a)Lowest temperature at catch fire
(b) Higher temperature at catch fire
(c) Any temperature
(d) None of these

6. The chemical substances which are secreted from endocrine glands are called- 1
(a)Puberty
(b) Adolescence
(c) Hormones

(d) None of these

7. Which of the following is incorrect? 1
(a) Oviparous animals give birth to young ones.
(b) Each sperm is a single cell.
(c) External fertilisation takes place in the frog.
(d) Binary fission is a method of asexual reproduction.

8. Which of the following diseases is caused by a bacterium? 1
(a)Chicken pox
(b)Tuberculosis
(c)Dengue
(d)Polio

SECTION B

9. Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30° as shown 2
in Fig. Draw the reflected ray from the second mirror.

10. The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 2
vibrations per second. What is the time period of the vibration?
11. What are antibiotics? What precautions must be taken while taking antibiotics? 2
12. Give the differences between a zygote and a foetus. 2
13. (a) Most liquids that conduct electricity are solutions of ______________ and 2
______________.
(b) The passage of an electric current through a solution causes ______________ effects.
SECTION C

14. Write a short paragraph on the harmful effects of microorganisms. 3
15. Describe with the help of a diagram an instrument which can be used to detect a charged 3
body.
16. Compare LPG and wood as fuels. 3
17. Make a labelled diagram of a candle flame. 3
SECTION D
18. a) Draw a labelled sketch of the human eye. 3+2
b) State the laws of reflection.
19. a)The bulb does not glow in the setup shown in Fig. List the possible reasons. 3+2

b) Does pure water conduct electricity? If not, what can we do to make it conducting?
20. Prepare a table having two columns depicting names of any 5 endocrine glands and hormones
secreted by them. 5
OR
List changes in the body that take place at puberty.

SECTION E(CCT)
21. During thunderstorms, air currents move upwards, and water droplets move downwards. This 5
causes the separation of charges between clouds and between clouds and the Earth. When the
magnitude of charges increases, air (normally a bad conductor) starts conducting and allows
the flow of electricity. This is called lightning, as this flow of charge is accompanied by bright
streaks of light and sound.

The process of flow of charge from cloud to cloud or from cloud to earth due to the separation
of positive and negative charges is called an electric discharge. Lightning conductors help to
protect buildings during lightning. They consist of a metal rod that is taller than the building,
which is installed within the walls during construction. They run all the way to the earth and
act as a direct passage for electric discharge during lightning.
Attempt any five(5) from following questions given below:
1. An electroscope is a device which is used to find if an object is
(a) charged
(b) magnetic
(c) free of cracks
(d) hot
2. Two charged objects are brought close to each other. Choose the most appropriate
statement from the following options:
(a) they may attract
(b) they may repel
(c) they may attract or repel depending on the type of charges they carry
(d) there will be no effect
3.If a charged plastic straw is brought near another uncharged plastic straw, what will happen?
4. Plastic straws A and B are rubbed with a dry cotton cloth. What will happen if they are
brought near each other?
5. What does a lightning conductor do?
6. How is Burj khalifa protected from lighting?

22. 5

Sound is produced by vibrating objects. We hear a variety of sounds in our surroundings. In
human beings, the vibration of the vocal cords produces sound. The eardrum senses the
vibrations of sound, it sends the signals to the brain. This process is called hearing. The
frequency is expressed in Hertz (Hz). Unpleasant sounds are called noise. Attempts should be
made to minimise noise pollution Plantation on the roadside and elsewhere can reduce noise

pollution. Sound travels through a medium (gas, liquid or solid). It cannot travel in a vacuum.
Excessive or unwanted sounds lead to noise pollution. Noise pollution may pose health
problems for human beings. The higher the frequency of vibration, the higher the pitch, and
the shriller the sound.
Attempts should be made to minimise noise pollution.
1. The loudness of a sound depends on:
(a) its amplitude.
(b) its frequency.
(c) its time period.
(d) its speed.
2. Which of the following statements is incorrect?
(a) Sound is produced by vibrations.
(b) Sound requires a medium for propagation.
(c) Light and sound both require a medium for propagation.
(d) Sound travels slower than light.
3. Ultra sound has a frequency of vibration
(a)between 20 and 20,000 Hz
(b)below 20 Hz
(c)above 20,000 Hz
(d)between 500 and 10,000 Hz
4. Which of the following voices is likely to have minimum frequency?
(a)Baby girl
(b)Baby boy
(c)A man
(d)A woman
5. Pitch of sound is determined by its
(a) frequency
(b) amplitude
(c) speed
(d) loudness

23. When a disease-carrying microbe enters our healthy body produces antibodies, body fights 5
and kills them by these antibodies. The body remembers how to fight the microbe if it enters
again. The antibodies remain in the body for a long time and protect us from the
disease-causing microbe. The substance which is injected into the body to trigger the body to
initiate this entire process is called a vaccine. Evidence exists that the Chinese employed
smallpox inoculation (or variolation, such use of smallpox material was called) as early as
1000 CE. It was practiced in Africa and Turkey as well, before it spread to Europe and the
America.
Edward Jenner’s innovation, begun with his successful 1796 use of cowpox material to create
immunity to smallpox, quickly made the practice widespread. His method underwent medical
and technological changes over the next 200 years, and eventually resulted in the eradication
of smallpox.
Louis Pasteur’s 1885 rabies vaccine was the next to make an impact on human disease. And
then, at the dawn of bacteriology, rapidly followed. Antitoxins and vaccines against
diphtheria, tetanus, anthrax, cholera, plague, typhoid, tuberculosis, and more developed
through the 1930s.
Do any 5 questions from the following:-
1. Name one of disease caused by virus?

2. Vaccine for smallpox is discovered by
a) Louis Pasteur b) Alexander Fleming c) Edward Jenner
d) John Mendel
3. Antibodies remain in the body for a long time, it is true or false?
4. Louis Pasteur in 1885 discovered vaccine for which disease?
5. Write importance of vaccine
6. Sumit is suffering from chicken pox .Doctor asked his mother if had taken vaccine for
chicken pox or not? Why doctor ask his mother this question?

SESSION ENDING EXAMINATION 2023-24
CLASS8 SCIENCE
MARKINGSCHEME
SECTION A
1. (b) virtual, behind the mirror and of the same size as the object. 1

2. (a) its amplitude. 1
3. (b)Thyroxine 1
4. (b)Metamorphosis 1
5. (a) Lowest temperature at catch fire 1
6. (c)Hormones 1
7. (a) Oviparous animals give birth to young ones. 1
8. (b)Tuberculosis 1

SECTION B

9. 2

10. Oscillation frequency = 500 Hz 2

The time period of the vibration = 1/500 = 0.002 s

11. Chemical agents that kill or stop the growth of disease-causing 2
microorganisms are called antibiotics. Antibiotics should be taken only on the
advice of a qualified doctor. Also, one must complete the course prescribed by
the doctor.

12. Any 2 points 2
Zygote:

 It is the earliest stage of development
 It is formed by the fusion of male and female gametes
 It is a single cell
 The zygote divides several times to form an embryo
 The zygote normally lasts a week and then develops into its next stage.

Foetus

 It is the last developmental stage of an organism
 The stage of the embryo shows all the main recognisable body parts of a
mature organism.
 The foetus stage occurs after the embryo stage
 Foetus mainly undergoes internal development

13. (a)acids, bases and salts 2

(b)chemical

SECTION C

14. Microorganisms cause diseases in plants and animals. For example, Cholera in 3
humans is caused by bacteria called Vibrio cholera. In animals, the virus
causes foot and mouth diseases. Microorganisms spoil food by decomposing
the food material. Some microorganisms spoil leather and clothes.
Microorganisms are also responsible for food poisoning.
15. 3

It consists of a metal rod on which two leaves of aluminium foil are fixed to one
end and a metal disc at the other end. The leaves are kept inside a conical
flask, and it is corked to isolate them from the atmospheric air.
When a charged body comes in contact with the metal disc, the aluminium
leaves move away from each other because some charges get transferred to
aluminium leaves through the metal rod. This process is called charging by
conduction. The charges on the leaves and the charged body are of the same
in nature, and thus, the leaves of aluminium repel each other. If the body is not
charged then they would attract each other.
16. Any 3 points 3
17. Candle Flame diagram 3

SECTION D
18. a) Correct labelled diagram of human eye 3
b)Correct laws of reflection (two points) 2
19. 3
a. i) The liquid may be non-conducting. In this case, the circuit is
incomplete, and the current does not pass through the liquid.

ii). Electric current may be weak for the circuit is made up of a material
which is not a good conductor of electricity, or there is insufficient energy
in the battery to generate electricity.

b) No, but pure water conducting electricity when salt dissolves in it. 2
20. ½*5
Any 5 endocrine glands and hormones secretedbythem. ½*5

OR
Any 5 changes.

SECTION E CCT

21. 1. (a) charged 1
2. (c) they may attract or repel depending on the type of charges they carry 1
3. Plastic straws will attract each other 1
4. They will repel each other. 1
5. A lightning conductor protects buildings. 1
6. A lighting conductor is a device use to protect the buildings.
22. 1. (a) its amplitude. 1
2.(c) Light and sound both require a medium for propagation. 1
3.(b) above 20,000 Hz 1
4. (c)A man 1
5.(a) frequency 1

23. a) smallpox, polio, aids etc. 1
b) c Edward Jenner 1
c) true 1
d) rabies 1
e) Correct importance of vaccine. 1
f) Doctor ask her this question because vaccine produce antibodies in the
Sumit body which will remain in his body.

END

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