Class VIII Science Question Bank for SUMMATIVE ASSESMENT

QUESTION BANK CLASS-VIII

Q.1 Which of the following cannot be charged easily by friction? (a) A plastic scale (b) A copper rod (c) An inflated balloon (d) A woollen cloth Q.2 Describe the construction of a kaleidoscope. Q.3 A child staying in a coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason? Q.4

Word game: Use the clues to work out the words. Across 3. Protruding voice box in boys 4. Glands without ducts 7. Endocrine gland attached to brain 8. Secretion of endocrine glands

Q.5 The table below shows the data on likely heights of boys and girls as they grow in age. Draw graphs showing height and age for both boys and girls on the same graph paper. What conclusions can be drawn from these graphs?

9. Pancreatic hormone 10. Female hormone Down 1. Male hormone 2. Secretes thyroxin 3. Another term for teenage 5. Hormone reaches here through blood stream 6. Voice box 7. Term for changes at adolescence

Q.6 When a glass rod is rubbed with a piece of 62, Nitikhand-3 Indirapuram, Ghaziabad.|Call us +91-9910817866 +91-9990495952 +91-9310122993| http://apexiit.co.in/


silk cloth the rod

(a) Baby girl

(a) and the cloth both acquire positive

(b) Baby boy

charge.

(c) A man

(b) becomes positively charged while the

(d) A woman

cloth has a negative charge.

Q.14 Fill in the blanks with suitable words.

(c) and the cloth both acquire negative

(a) Time taken by an object to complete

charge.

one oscillation is called _________.

(d) becomes negatively charged while the cloth has a positive charge. Q.7 Does pure water conduct electricity? If not, what can we do to make it conducting? Q.8 Name the scale on which the destructive energy of an earthquake is measured. An

(b) Loudness is determined by the ________ of vibration. (c) The unit of frequency is _________. (d) Unwanted sound is called _________. (e) Shrillness of a sound is determined by the _________ of vibration.

earthquake measures 3 on this scale. Would

Q.15 The bulb does not glow in the setup shown

it be recorded by a seismograph? Is it likely

in Figure List the possible reasons. Explain

to cause much damage?

your answer.

Q.9 List three states in India where earthquakes are more likely to strike. Q.10 Explain how CO2 is able to control fires. Q.11 Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost

Q.16 Identify the part which vibrates to produce

part of the flame. Whose water will get

sound in the following instruments.

heated in a shorter time?

(a) Dholak

Q.12 What is the term used for secretions of endocrine glands responsible for changes taking place in the body? Q.13 Which of the following voices is likely to have minimum frequency?

(b) Sitar (c) Flute Q.17 Describe with the help of a diagram an instrument which can be used to detect a charged body.

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Q.18 Is it safe for the electrician to carry out

(a) Like charges attract each other. (T / F)

electrical repairs outdoors during heavy

(b) A charged glass rod attracts a charged

downpour? Explain.

plastic straw. (T / F)

Q.19 Compare LPG and wood as fuels.

(c) Lightning conductor cannot protect a building from lightning. (T/F)

Q.20 Choose the correct option. (a) Adolescents should be careful about

(d) Earthquakes can be predicted in advance. (T / F)

what they eat, because (i) proper diet develops their brains. (ii) proper diet is needed for the rapid growth taking place in their body. (iii) adolescents feel hungry all the time. (iv) taste buds are well developed in

Q.23 Name the unit in which the calorific value of a fuel is expressed. Q.24 Sketch larynx and explain its function in your own words. Q.25 Differentiate between regular and diffused

teenagers.

reflection. Does diffused reflection mean

(b) Reproductive age in women starts when

the failure of the laws of reflection?

their (i) menstruation starts. (ii) breasts start developing. (iii) body weight increases. (iv) height increases. (c) The right meal for adolescents consists of (i) chips, noodles, coke. (ii) chapatti, dal, vegetables. (iii) rice, noodles and burger. (iv) vegetable cutlets, chips and lemon drink.

Q.26 Fill in the blanks. (a) Most liquids that conduct electricity are solutions of ________, _______ and ________. (b) The passage of an electric current through a solution causes _________ effects. (c) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the __________ terminal of the battery. (d) The process of depositing a layer of any

Q.21 Gurmit wanted to perform Activity 16.8 using a laser torch. Her teacher advised her

desired metal on another material by means of electricity is called _________.

not to do so. Can you explain the basis of the teacher’s advice?

Q.27 Sometimes, a crackling sound is heard while taking off a sweater during winters.

Q.22 Write T against true and F against false in

Explain.

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Q.28 Suppose you are outside your home and an earthquake strikes. What precaution would you take to protect yourself? Q.29 Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30° as

Q.34 Explain why a charged body loses its charge if we touch it with our hand. Q.35 What is menstruation? Explain. Q.36 Can the process of rusting be called combustion? Discuss.

shown in Figure. Draw the reflected ray from the second mirror.

Q.37 Suggest three measures to protect ourselves from lightning. Q.38 Angle of incidence is equal to the angle of reflection. (a) Always

Q.30 Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane. Q.31 What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray? Q.32 Write notes on − (a) Adam’s apple.

(b) Sometimes (c) Under special conditions (d) Never Q.39 Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain. Q.40 Name three liquids, which when tested in the manner shown in Figure may cause the magnetic needle to deflect.

(b) Secondary sexual characters. (c) Sex determination in the unborn baby. Q.33 (a) Find out the position of the image of an object situated at A in the plane mirror (Figure). (b) Can Paheli at B see this image? (c) Can Boojho at C see this image? (d) When Paheli moves from B to C, where does the image of A move?

Q.41 Your parents are going to buy a house. They have been offered one on the roadside and another three lanes away from the roadside. Which house would you suggest



your parents should buy? Explain your

involving electrical equipment.

answer.

(b) LPG is a better domestic fuel than

Q.42 Explain in what way noise pollution is harmful to humans.

wood. (c) Paper by itself catches fire easily whereas a piece of paper wrapped around

Q.43 Make a labelled diagram of a candle flame. Q.44 Fill in the blanks: (a) Burning of wood and coal causes _________ of air. (b) A liquid fuel used in homes is ___________. (c) Fuel must be heated to its ___________ before it starts burning. (d) Fire produced by oil cannot be controlled by _________. Q.45 What is the difference between noise and

an aluminium pipe does not. Q.52 In the following statements, tick ‘T’ against those which are true, and ‘F’ against those which are false. (a) Sound cannot travel in vacuum. (T / F) (b) The number of oscillations per second of a vibrating object is called its time period. (T / F) (c) If the amplitude of vibration is large, sound is feeble. (T / F) (d) For human ears, the audible range is 20

music? Can music become noise

Hz to 20,000 Hz. (T / F)

sometimes?

(e) The lower the frequency of vibration,

Q.46 Draw a labelled sketch of the human eye. Q.47 What are sex hormones? Why are they named so? State their function.

the higher is the pitch. (T / F) (f) Unwanted or unpleasant sound is termed as music. (T / F) (g) Noise pollution may cause partial

Q.48 List changes in the body that take place at

hearing impairment. (T/F)

puberty. Q.53 In case of a fire, before the firemen use the Q.49 Explain why a charged balloon is repelled

water hoses, they shut off the main

by another charged balloon whereas an

electrical supply for the area. Explain why

uncharged balloon is attracted by another

they do this.

charged balloon? Q.54 The weather department has predicted that Q.50 List sources of noise pollution in your surroundings. Q.51 Give reasons. (a) Water is not used to control fires

a thunderstorm is likely to occur on a certain day. Suppose you have to go out on that day. Would you carry an umbrella? Explain.



Q.55 Mention against each of the following whether regular or diffused reflection will

eyes. Q.61 A tester is used to check the conduction of

take place when a beam of light strikes.

electricity through two liquids, labelled A

Justify your answer in each case.

and B. It is found that the bulb of the tester

(a) Polished wooden table

glows brightly for liquid A while it glows

(b) Chalk powder

very dimly for liquid B. You would

(c) Cardboard surface

conclude that

(d) Marble floor with water spread over it

(i) liquid A is a better conductor than liquid

(e) Mirror

B.

(f) Piece of paper

(ii) liquid B is a better conductor than

Q.56 The sound from a mosquito is produced

liquid A.

when it vibrates its wings at an average rate

(iii) both liquids are equally conducting.

of 500 vibrations per second. What is the

(iv) conducting properties of liquid cannot

time period of the vibration?

be compared in this manner.A tester is used

Q.57 In an experiment 4.5 kg of a fuel was

to check the conduction of electricity

completely burnt. The heat produced was

through two liquids, labelled A and B. It is

measured to be 180,000 kJ. Calculate the

found that the bulb of the tester glows

calorific value of the fuel.

brightly for liquid A while it glows very dimly for liquid B. You would conclude

Q.58 State the laws of reflection. Q.59 Fill in the blanks in the following.

that (i) Liquid A is a better conductor than

(a) A person 1 m in front of a plane mirror

liquid B.

seems to be ____ __ m away from his

(ii) Liquid B is a better conductor than

image.

liquid A.

(b) If you touch your ________ ear with

(iii) Both liquids are equally conducting.

your right hand in front of a plane mirror, it

(iv) Conducting properties of liquid cannot

will be seen in the mirror that your right ear

be compared in this manner.

is touched with your _________. (c) The size of the pupil becomes ________

Q.62 Which zone of a flame does a goldsmith use for melting gold and silver and why?

when you see in dim light. (d) Night birds have _________ cones than rods in their eyes.

Q.63 Explain how the use of CNG in automobiles has reduced pollution in our cities.

Q.60 Explain how you can take care of your 62, Nitikhand-3 Indirapuram, Ghaziabad.|Call us +91-9910817866 +91-9990495952 +91-9310122993| http://apexiit.co.in/


Q.64 Choose the correct answer. Sound can travel through

Q.71 Define adolescence. Q.72 When the free ends of a tester are dipped

(a) gases only

into a solution, the magnetic needle shows

(b) solids only

deflection. Can you explain the reason?

(c) liquids only (d) solids, liquids and gases.

Q.73 Prepare a list of objects around you that are electroplated.

Q.65 It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.

Q.74 How many images of a candle will be formed if it is placed between two parallel

Q.66 Image formed by a plane mirror is

plane mirrors separated by 40 cm?

(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

Q.75 A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.

enlarged. (d) real, behind the mirror and of the same size as the object. Q.67 Lightning and thunder take place in the sky at the same time and at the same distance from us. Lightning is seen earlier and thunder is heard later. Can you explain? Q.68 Prepare a table having two columns depicting names of endocrine glands and hormones secreted by them. Q.69 Paheli had heard that rain water is as good as distilled water. So, she collected some rain water in a clean glass tumbler and tested it using a tester. To her surprise, she found that the compass needle showed deflection. What could be the reasons? Q.70 List conditions under which combustion can take place.


Class VIII Science Question Bank for SUMMATIVE ASSESMENT

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