Electricity and Magnetism Test

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Electricity and Magnetism Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

For the movement of electrons between two points, there must be a

A
temperature difference between two points

B
potential difference between two points

C
both points must be at the same potential

D
electrons can even flow without any temperature and potential difference between two points

Solution

Current flows only across a potential difference.
Question 2
1 / -0

Voltage can be generated

A
by rubbing certain types of materials against each other

B
by means of chemical reactions

C
by influence of magnetism on conductors

D
all of these
Question 3
1 / -0

Fuse wire is made up of

A
63% tin and 37% lead

B
63% lead and 37% tin

C
63% tin and 37% aluminium

D
63% lead and 37% aluminium
Question 4
1 / -0

How many 100 watt bulbs may be safely used on 220 volt with five amperes fuse?

A
22

B
11

C
10

D
5

Solution

We know,
P=VI
For 'n'identical bulbs,
Total power = n x 100 watts
n *100 = 220 volts x 5 amperes
n = 220 x 5 / 100
=11
Question 5
1 / -0

One should not connect a number of electric appliances to the same power sockets because

A
this can damage the appliances

B
this can damage the domestic wiring due to over-heating

C
the appliances will not get full voltage

D
the appliances will not get proper current
Question 6
1 / -0

You are given three bulbs of 25, 40 and 60 watt all operating at 220 V. Which of the three bulbs has the lowest resistance?

A
60 watt bulb

B
40 watt bulb

C
25 watt bulb

D
Data insufficient

Solution

P=V²/R
Power is inversely proportional to the square of resistance.
Question 7
1 / -0

Current always flows from

A
high potential to low potential

B
low potential to high potential

C
both of the above

D
none of these
Question 8
1 / -0

Find out the correct statement.

A
A freely suspended bar magnet points north.

B
A freely suspended bar magnet is constantly oscillating.

C
A freely suspended bar magnet always points east.

D
A freely suspended bar magnet will set itself at an angle to the horizontal.

Solution

A freely suspended magnet aligns itself to the earth`s magnetic field. The north pole of magnet points towards the magnetic south pole of earth, which is at the geographical north.
Question 9
1 / -0

If a magnet is cut into two pieces of equal length,

A
both pieces will lose their magnetism

B
one piece will act as north pole and the other as south pole

C
both pieces will behave as complete magnets

D
one of the pieces will lose its magnetism

Solution

Magnetic monopoles do not exist. Magnets will form new north and south poles.
Question 10
1 / -0

When a bar magnet is immersed in a heap of iron filings and is then taken out, it is observed that iron filings stick to the surface of the bar magnet. The iron filings would be observed to

A
stick uniformly throughout the surface of the bar magnet

B
stick randomly on the surface of the bar magnet

C
have maximum concentration at the two ends of the bar magnet

D
have maximum concentration slightly away from the two ends of the bar magnet

Solution

Magnets have maximum magnetic strength at the ends and the minimum strength towards the centre, so iron filings would stick at the ends of the magnet.

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Re-Attempt Weekly Quiz Competition

Electricity and Magnetism Test - 2

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Electricity and Magnetism Test - 2

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SHARING IS CARING

Question 1

temperature difference between two points

potential difference between two points

both points must be at the same potential

electrons can even flow without any temperature and potential difference between two points

Solution

Question 2

by rubbing certain types of materials against each other

by means of chemical reactions

by influence of magnetism on conductors

all of these

Question 3

63% tin and 37% lead

63% lead and 37% tin

63% tin and 37% aluminium

63% lead and 37% aluminium

Question 4

22

11

10

5

Solution

Question 5

this can damage the appliances

this can damage the domestic wiring due to over-heating

the appliances will not get full voltage

the appliances will not get proper current

Question 6

60 watt bulb

40 watt bulb

25 watt bulb

Data insufficient

Solution

Question 7

high potential to low potential

low potential to high potential

both of the above

none of these

Question 8

A freely suspended bar magnet points north.

A freely suspended bar magnet is constantly oscillating.

A freely suspended bar magnet always points east.

A freely suspended bar magnet will set itself at an angle to the horizontal.

Solution

Question 9

both pieces will lose their magnetism

one piece will act as north pole and the other as south pole

both pieces will behave as complete magnets

one of the pieces will lose its magnetism

Solution

Question 10

stick uniformly throughout the surface of the bar magnet

stick randomly on the surface of the bar magnet

have maximum concentration at the two ends of the bar magnet

have maximum concentration slightly away from the two ends of the bar magnet

Solution

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