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Std8 Revision Quiz

Total questions: 42

Worksheet time: 26mins

Name
Class
Date
1.
The strongest part of a magnet is...
a)
the bars.
b)
the force field.
c)
the poles. 
d)
the middle.
2.

Ramon puts two magnetic toy trains very close to each other on a track. What will happen next, and why?

a)

The trains will move closer to each other because the magnetic force will pull the trains together.

b)

The trains will not move because the magnets are not touching

c)

The trains will move away from each other because the magnetic force will push the trains apart.

d)

The trains will move away from each other because the magnets are not touching.

3.
This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
a)
Add more coils of wire to the nail.
b)
Use a smaller battery.
c)
Reverse the poles of the magnet.
d)
Remove all the coils and the nail.
4.
What would increase the strength of an electromagnet?
a)
Increasing the amount of current flowing through the wire.
b)
Inserting a wooden core inside the coil
c)
Changing the direction of the current
d)
Decreasing the number of coils of wire
5.

Select the diagram with the weakest magnetic field

a)
b)
c)
6.

Are the magnetic field lines in the picture correct?

a)

Yes, because they point from north to south.

b)

No, because they point from north to south (they're supposed to go the other way).

c)

Yes, because the North pole is on the left in all pictures.

d)

No, because the North pole is on the left in all pictures (it's supposed to be on the right).

7.

Where was magnets first discovered?

a)

Asia minor

b)

Asia major

c)

Magnes

d)

Maldives

8.

To make temporary magnets, what material is most commonly used?

a)

Ferrrite

b)

Iron

c)

Soft Iron

d)

Chromium

9.
Consider the conduction charging shown. 
a)
Electrons move from the insulating stand into the sphere.
b)
Protons move from the bar into the sphere.
c)
Electrons move from the charged metal bar into the sphere.
d)
Protons move from the sphere into the negatively charged bar.
10.
A glass rod becomes positively charged when it is rubbed with silk. This net positive charge accumulates because the glass rod
a)
gains electrons
b)
loses electrons
c)
gains protons
d)
loses protons
11.
Two electrically neutral metal spheres, A and B, on insulating stands are placed in contact with each other. A negatively charged rod is brought near, but does not touch the spheres, as shown in the diagram below. How are the spheres now charged?
a)
A is positive and B is positive.
b)
A is negative and B is positive.
c)
A is positive and B is negative.
d)
A is negative and B is negative.
12.
An electrostatic force of magnitude F exists between two metal spheres having identical charge q. The distance between their centers is r. Which combination of changes would produce no change in the electrostatic force between the spheres?
a)
doubling q on both spheres while halving r
b)
doubling q on one sphere while halving r
c)
doubling q on one sphere while doubling r
d)
doubling q on both spheres while doubling r
13.

An atom of oxygen has 8 protons and 10 electrons, this means the atom is ____________

a)

positively charged because it has excess electrons

b)

negatively charged because it has excess electrons

c)

positively charged because it has a deficiency of electrons

d)

negatively charged because it has a deficiency of electrons

14.

Identify the figure which you are supposed do during lightning.

a)
b)
c)
15.

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

16.

The process of transferring of charge from a charged object to the earth is called —————-

a)

Charging

b)

Uncharging

c)

Earthing

d)

All

17.

How many types of charges are gained by rubbing objects?

a)

2

b)

1

c)

3

d)

4

18.

Identify the Y shaped structure in the given figure

a)

Lightning rod

b)

Plastic rod

c)

Water pipe

19.
A neutral electroscope
a)
A
b)
C
c)
D
d)
E
20.
Your arm hair raising as you approach a television is an example of charging by induction
a)
true
b)
false
21.

A negatively charged rod is touched to the top of an electroscope. Which shows the resulting charge?

a)

A

b)

B

c)

C

d)

D

e)

E

22.

What charge will the metal plate have?

a)

positive; protons attract protons

b)

positive; protons attract electrons

c)

negative; protons attract electrons

d)

negative; protons attract protons

23.

A positively charged rod is brought close to, but not touching a neutral electroscope. Which shows the resulting charge?

a)

A

b)

B

c)

C

d)

D

e)

E

24.

Which of the following uses the principle of expansion of matter?

a)

Air conditioner

b)

Mercury in a thermometer

c)

The handle of a pan is made of plastic

d)

Walls of houses are painted white

25.

Diagram shows an investigation carried out by Manjit. What conclusion can be made from the investigation?

a)

Heat in the air flows through convection.

b)

Heat in the air flows through conduction.

c)

The air in the flask expands when heated up.

d)

The air in the flask contracts when heated up.

26.

Thermostats functions on the principle that:

a)

some metals expands and contracts at different rates

b)

all metal expands and contracts at different rates

c)

all metals expands and contracts at the same rates

27.

What can be done to ensure that the tracks do not become crooked like this? You may choose more than one answer.

a)

Expansion gap should be included between adjacent tracks.

b)

Rollers should be placed below the train tracks.

c)

A longer track should be used.

d)

Expansion bends should be included in the train track design

28.

In this experiment, what is the temperature shown on the thermometer above the trough (T1) at last?

a)

40 C

b)

00 C

c)

100 C

29.

Water has minimum volume and maximum density at

a)

4 degree Celsius

b)

zero degree Celsius

c)

100 degree Celsius

d)

none of these

30.

What is the melting point of ice in kelvin scale?

(a)  

31.

From the graph it is evident that the volume of water ______ from 0 to 40C and volume of water ______ from 4 to 100C . Write increases or decreases or remains same separated by a comma.

(a)  

32.

What type of wave is pictured?

a)

Transverse wave

b)

Longitudinal wave

c)

Wave, what wave?

d)

Slinky wave

33.
Material (matter) through which a wave travels
a)
medium
b)
Doppler Effect
c)
sound
d)
pitch
34.
When a sound is louder what measurement gets bigger?
a)
Frequency 
b)
Amplitude 
c)
Wavelength 
d)
Crest
35.
What is B?
a)
crest
b)
trough
c)
compression
d)
rarefaction
36.
A wave that requires a medium through which to travel
a)
mechanical wave
b)
chemical wave
c)
electromagnetic wave
d)
pitch
37.
If you want to change the pitch of a sound, you have to change the ___
a)
frequency
b)
amplitude
c)
speed
d)
volume
38.
Which is a tool that is used in medicine to view internal organs and pregnancy.
a)
radar
b)
doppler
c)
ultrasound
d)
sonar
39.
The distance between the crest of a wave and the crest of the next wave is:
a)
3mm
b)
frequency
c)
amplitude
d)
wavelength
40.

Calculate the speed of sound if a sound wave travels 680 m in 2 seconds.

a)

1360 m/s

b)

340 m/s

c)

The speed of sound is always the same

d)

250 m/s

41.

which wave has a shorter wave length

a)
b)
42.

The graph shows how the vertical height of a travelling wave varies with distance along the path of the wave.


The speed of the wave is 20 cm s–1.


What is the period of the wave?

a)

0.1 s

b)

0.2 s

c)

5.0 s

d)

10.0 s

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