APEX INSTITUTE was conceptualized in May 2008, keeping in view the dreams of young students by the vision & toil of Er. Shahid Iqbal. We had a very humble beginning as an institute for IIT-JEE / Medical, with a vision to provide an ideal launch pad for serious JEE students . We actually started to make a difference in the way students think and approach problems. We started to develop ways to enhance students IQ. We started to leave an indelible mark on the students who have undergone APEX training. That is why APEX INSTITUTE is very well known of its quality of education and the dedication towards its target.

1. 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/

2. QUESTION BANK CLASS-VIII
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.
62, Nitikhand-3 Indirapuram, Ghaziabad.|Call us +91-9910817866 +91-9990495952 +91-9310122993| http://apexiit.co.in/

3. QUESTION BANK CLASS-VIII
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.
the following statements.
62, Nitikhand-3 Indirapuram, Ghaziabad.|Call us +91-9910817866 +91-9990495952 +91-9310122993| http://apexiit.co.in/

4. QUESTION BANK CLASS-VIII
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
62, Nitikhand-3 Indirapuram, Ghaziabad.|Call us +91-9910817866 +91-9990495952 +91-9310122993| http://apexiit.co.in/

5. QUESTION BANK CLASS-VIII
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.
62, Nitikhand-3 Indirapuram, Ghaziabad.|Call us +91-9910817866 +91-9990495952 +91-9310122993| http://apexiit.co.in/

6. QUESTION BANK CLASS-VIII
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/

7. QUESTION BANK CLASS-VIII
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.
62, Nitikhand-3 Indirapuram, Ghaziabad.|Call us +91-9910817866 +91-9990495952 +91-9310122993| http://apexiit.co.in/