Electricity and Magnetism Test

Result

Electricity and Magnetism Test - 5

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Good conductors have many loosely bound

A
atoms

B
molecules

C
protons

D
electrons

Solution

Free electrons promote the flow of electricity.
Question 2
1 / -0

The property of a material, when it opposes or limits the flow of electric current through it is called

A
potential difference

B
electric resistance

C
conductivity

D
power

Solution

The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor.
Question 3
1 / -0

Ampere-second stands for the unit of

A
power

B
energy

C
e.m.f.

D
electric charge

Solution

Ampere- Unit of current
Second= Unit of time
Current* time= Charge
Question 4
1 / -0

In a simple voltaic cell, the negative electrode is of

A
zinc

B
copper

C
carbon

D
silver

Solution

The zinc is the more reactive, and is the negative electrode, releasing electrons.
Question 5
1 / -0

The simplest way of maintaining a potential difference between the two ends of a conductor is

A
to connect it to a battery or dry cell

B
to bring the two ends of conductor near each other

C
to mark the two ends of conductor away from each other

D
none of these
Question 6
1 / -0

The net e.m.f. of a normal dry cell is

A
2 volt

B
1 volt

C
1.5 volt

D
3.0 volt

Solution

A common dry cell is the zinc–carbon battery, sometimes called the dry Leclanché cell, with a nominal voltage of 1.5 volts, the same as the alkaline battery (since both use the same zinc–manganese dioxide combination).
Question 7
1 / -0

Tungsten is mainly used for making filaments of electric bulbs because of its

A
low cost

B
high melting point

C
high electrical conductivity

D
low thermal conductivity

Solution

The filaments in bulbs have to withstand high temperatures; hence a substance with high melting point is needed.
Question 8
1 / -0

Coating of iron with zinc is known as

A
galvanization

B
electroplating

C
ionization

D
none of these

Solution

Galvanization ( as it is most commonly called in that industry) is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which parts are submerged in a bath of molten zinc.
Question 9
1 / -0

When a current flowing through a resistance increases four times, the heat developed will increase

A
two times

B
four times

C
eight times

D
sixteen times

Solution

Energy = I²Rt
Question 10
1 / -0

Chemical identity of an atom can be changed by

A
changing the number of protons in an atom`s nucleus

B
changing the number of neutrons in an atom`s nucleus

C
changing the number of neutrons and protons in an atom`s nucleus

D
chemical identity cannot be changed
Question 11
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 12
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 13
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 14
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 15
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 16
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 17
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 18
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 19
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 20
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.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Electricity and Magnetism Test - 5

Result

Electricity and Magnetism Test - 5

Score

-

Rank

-

SHARING IS CARING

Question 1

atoms

molecules

protons

electrons

Solution

Question 2

potential difference

electric resistance

conductivity

power

Solution

Question 3

power

energy

e.m.f.

electric charge

Solution

Question 4

zinc

copper

carbon

silver

Solution

Question 5

to connect it to a battery or dry cell

to bring the two ends of conductor near each other

to mark the two ends of conductor away from each other

none of these

Question 6

2 volt

1 volt

1.5 volt

3.0 volt

Solution

Question 7

low cost

high melting point

high electrical conductivity

low thermal conductivity

Solution

Question 8

galvanization

electroplating

ionization

none of these

Solution

Question 9

two times

four times

eight times

sixteen times

Solution

Question 10

changing the number of protons in an atom`s nucleus

changing the number of neutrons in an atom`s nucleus

changing the number of neutrons and protons in an atom`s nucleus

chemical identity cannot be changed

Question 11

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 12

by rubbing certain types of materials against each other

by means of chemical reactions

by influence of magnetism on conductors

all of these

Question 13

63% tin and 37% lead

63% lead and 37% tin