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Worksheets

Class 8

Total questions: 77

Worksheet time: 46mins

Name
Class
Date
1.
A sound with a high frequency has a _____ pitch. A sound with a ____ frequency has a low pitch.
a)
high, low
b)
low, high
c)
medium, high
d)
high, medium
2.
A sound that bounces off a surface is called an ________.
a)
loud sound
b)
echo
c)
repeat
d)
quiet sound
3.
A back and forth movement of matter
a)
volume
b)
vibration
c)
pitch
d)
frequency
4.
how high or low a sound is
a)
frequency
b)
volume
c)
vibration
d)
pitch
5.
Sound travels FASTEST through which of these materials?
a)
Air
b)
Empty space
c)
Metal
d)
Water
6.
Sound is caused by? 
a)
force
b)
vibrations
c)
instruments
7.
Sound is a form of? 
a)
energy
b)
pitch
c)
volume
8.
Why is sound able to travel faster through a solid than a gas?
a)
Gas molecules are packed tightly.
b)
Sound does not travel faster through a solid than a gas.
c)
Solid molecules are packed tightly.
d)
Gas molecules move slowly.
9.
Sound does not travel in space because
a)
Space is too far away.
b)
There is no matter in space.
c)
Space is the final frontier
d)
Space has planets.
10.
Why is the school library covered with carpet?
a)
So everyone can make a lot of noise
b)
to help absorb sounds to keep it quiet
c)
because it looks good
d)
to help absorb sounds so it can stay noisy
11.

______________ sounds have a larger amplitude

a)

quiet

b)

loud

12.

What are the units for intensity?

a)

hertz

b)

decibels

c)

dopplars

d)

sonars

13.

Which property of a sound wave determines how close together the particles are in the compression region?

a)

amplitude

b)

frequency

c)

wavelength

d)

wave speed

14.
What is Pitch?
a)
How loud or soft a sound is
b)
muscle that holds vocal cords
c)
movement back and forth
d)
how high or low a sound is
15.
How does sound travel?
a)
Sounds travels in waves
b)
sound travels slow
c)
sound travels fast
d)
sound doesn't travel
16.
If there are two forces going in the same direction how would you find the net force?
a)
Subtract
b)
Add
c)
Neither
d)
Multiply
17.
Forces that have a net force of zero ( the object is still).
a)
Balanced force
b)
Unbalanced force
18.
What is the net force?
a)
5 N
b)
45 N to the left
c)
5 N to the right
d)
45 N to the right
19.
Is this and example of a balanced or unbalanced force?
a)
balanced
b)
KITTIES!
c)
unbalanced
d)
pshhh
20.
If these boys are pulling with the same amount of force.  What will happen?
a)
The boy in blue will win.
b)
They will not move at all.
c)
The boy in red will win.
d)
Both will fall down.
21.
Two teams were having a tug of war.  Team A had four people on the team, and each of them pulled with 25N of force.  Team B had three people on the team, and each of them pulled with 35 N of force.  Which team won, and how much greater was their net force on the rope?
a)
Team B by 5 N
b)
Team B by 30 N
c)
Team A by 20 N
d)
Team B by 65 N
22.

What type of force is this man using to push his grocery cart?

a)

Normal Force

b)

Gravity

c)

Air Resistance

d)

Applied Force

23.

What is the net force on the box shown in the picture?

a)

10 N to the left

b)

10 N to the right

c)

60 N to the left

d)

50 N to the right

24.
Calculate the net force shown in the  diagram?
a)
0N
b)
400 N
c)
600 N
d)
800 N
25.

Stretching of a spring describes effect of force on

a)

Change of speed

b)

Change of shape

c)

Change of direction

d)

All the above

26.

Moon orbiting around Earth is due to?

a)

Contact force

b)

Non contact force

c)

Balanced force

d)

Unbalanced force

27.

While you are playing with magnets ,we observe that like poles repel. It is due to

a)

Contact forces

b)

Non contact forces

c)

Unbalanced

d)

Balanced

28.

Why playing cricket is an example of muscular contact force?

a)

We hit the ball using or hand

b)

We hit the bat using our hand

c)

We hit the ball using the bat, held in our hands

d)

Bat hits the ball without any help from hand

29.

A moving object can be brought to rest by?

a)

Applying force in same direction

b)

Applying force in opposite direction

c)

By not applying any force

30.

Which of the following does not satisfy requirement of non-contact force?

a)

Gravity

b)

Friction

c)

Magnetic

d)

Electrostatic

31.

friction is a _________ force

a)

Non contact

b)

Contact

c)

magnetic

d)

electrostatic

32.

Friction always

a)

Helps in motion

b)

Opposes motion

c)

Both of these

d)

None of these

33.
How does friction affect speed?
a)
more friction decreases speed
b)
more friction increases speed
c)
less friction decreases speed
d)
less friction doesn't affect speed
34.

What type of friction is it when the object doesnot move even when external force is applied on it?

a)

static

b)

sliding

c)

fluid

d)

rolling

35.

A force of friction which balances the applied force during the stationary state of a body is called _________

a)

force

b)

Sliding friction

c)

Static friction

d)

Rolling friction

36.

Sliding friction is _________ than the static friction

a)

less

b)

more

c)

equal

d)

zero

37.

Rolling friction is _______ than sliding and static friction

a)

Lesser

b)

Equal to

c)

Greater

d)

None of the above

38.

What kind of substances are known as lubricants?

a)

Increase friction

b)

Decrease friction

c)

Increase or decrease friction

d)

None of these

39.

Friction produced due to fluids is called

a)

Sliding Fiction

b)

Rolling friction

c)

Static friction

d)

Drag

40.

Which is a/ are streamlined object?

a)

Aeroplane

b)

Boat

c)

Ship

d)

All the above

41.

It is difficult to walk on an oily floor because

a)

Force of friction is very less

b)

Force of friction is very high

c)

we don't like to walk on oily floor

d)

None of these

42.
What does friction produce?
a)
light
b)
sound
c)
heat
d)
gravity
43.
Which of the following is an example of friction that is harmful?
a)
Pencil marking on paper
b)
Engine parts wearing out
c)
sand placed on ice in the winter
d)
Using an eraser to erase marks
44.
What are the units on the force due to friction?
a)
none
b)
Newtons
c)
meters
d)
kilograms
45.

The faster you are the more air resistance

a)

True

b)

False

46.

The body will move only when

a)

Force of friction = applied force

b)

Force of friction > applied force

c)

Force of friction < applied force

d)

All of the above

47.

What is fluid friction?

a)

friction is friction between two surfaces that aren't moving relatively to each other

b)

friction between a rolling object and the surface that it is rolling on

c)

friction where an object slides rubs against another surface

d)

friction of something going through any type of liquid or air

48.

A smooth shining surface, which rebounds the light back in same or in different direction, is called

a)

Mirror

b)

Incident ray

c)

Lens

d)

Idealisation

49.

Front balged part of the eyeball is called

a)

PUPIL

b)

CORNEA

c)

RETINA

d)

IRIS

50.

The splitting of white light into its seven constituent colours is called

a)

refraction

b)

dispersion

c)

deviation

d)

reflection

51.

The iris is the coloured part of the eye

a)

true

b)

false

52.

What makes objects visible ?

a)

the absorption of light by objects

b)

the reflected light from the object

c)

the total internal reflection taking place in an object

53.

If the angle of incidence of light falling on a plane mirror is 30°, what will be the angle of reflection?

a)

60°

b)

30°

c)

55°

d)

40°

54.

When we stand in front of our dressing table, our left hand seems to be right and right seems to be left. This is called

a)

mirage

b)

Up -side down phenomenon

c)

Left-right confusion

d)

Lateral inversion

55.

Angle of incidence is always

a)

equal to angle of reflection

b)

equal to angle of refraction

c)

more than angle of reflection

d)

less than refraction

56.

The angle of reflection is equal to the angle of incidence.

a)

sometimes

b)

always

c)

never

d)

under special case

57.

If you are standing 2m away from a plane mirror the distance between you and your image are

a)

2m

b)

4m

c)

6m

d)

8m

58.

the lens focuses light on the back of the eye, on a layer called

a)

retina

b)

optic nerves

c)

pupil

d)

iris

59.

The impression of an image does not vanish immediately from the retina.It persits there for about ___________ of a second.

a)

1/16 th

b)

1/5 th

c)

1

d)

6

60.

An interesting feature of a ____________ is that you will never see the same pattern again.

a)

periscope

b)

telescope

c)

kaledioscope

d)

mirror

61.

sunlight called white light consits of __________________

colours

a)

1

b)

5

c)

0

d)

7

62.

Diffused / irregular reflection takes place from

a)

rough surface

b)

smooth surface

63.

An electroscope is a device which is used to find if an object is

a)

charged

b)

magnetised

c)

hot

d)

free of cracks

64.

The outermost layer of earth is called

a)

mantle

b)

outer core

c)

inner core

d)

crust

65.

Which of the following cannot be charged easily by friction?

a)

A plastic scale

b)

A copper rod

c)

An inflated balloon

d)

A woolen cloth

66.

When two bodies are rubbed against each other, they acquire

a)

Equal and similar charges

b)

Equal and opposite charges

c)

Unequal and similar charges

d)

Unequal and opposite charges

67.

Which of the following produces charge ?

a)

gum

b)

amber

c)

lac

d)

fructose

68.

Like charges

a)

can repel or attract each other depending on the quantity of charge

b)

can repel or attract each other depending on conditions

c)

always repel each other

d)

always attract each other

69.

When an uncharged body B is brought into contact with a positively charged body A:

a)

A loses its charge

b)

B acquires positive charge

c)

B acquire no charge

d)

B acquires negative charge

70.

The place of origin of an earthquake is called

a)

Focus

b)

epicenter

c)

Disc

d)

None of these

71.

Which of the following is negatively charged particle?

a)

proton

b)

electron

c)

neutron

d)

all of these

72.

An earthquake of magnitude 8-9 is

a)

not felt

b)

mild

c)

strong

d)

very strong

73.

During the development of thunderstorm, the charges accumulate near the upper edges of the cloud is –

a)

positive

b)

negative

c)

neutral

d)

none of these

74.

Name the scientist who showed that lightening and spark from our clothes are essentially the same phenomenon ?

a)

Thomas Alva Edison

b)

Franklin D. Roosevelt

c)

Issac Newton

d)

Benjamin Franklin

75.

Which device is used to protect building from lightning ?

a)

Seismograph

b)

Barometer

c)

Lightning conductor

d)

Thermal conductor

76.

The movement of the earth’s plates causes

a)

cyclones

b)

lightning

c)

earthquakes

d)

thunderstorms

77.

Interaction of charges is called _______.

a)

lightning

b)

electrical discharge

c)

earthing

d)

electricity

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