Electricity and Magnetism Test

Result

Electricity and Magnetism Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

The rod or stem in a gold leaf electroscope is made up of

A
wood

B
brass

C
glass

D
ebonite

Solution

Brass is the correct option to be chosen. It consists of a vertical metal rod, usually brass, from the end of which hang two parallel strips of thin flexible gold leaf. A disc or ball terminal is attached to the top of the rod, where the charge to be tested is applied.
Question 2
1 / -0

What is the current in a wire through which 20.0 C of charge passes in 4.00 s?

A
2.00 A

B
8.00 A

C
4.00 A

D
5.00 A
Question 3
1 / -0

A conductor carries a current of 0.3 A for 20 s. How many electrons will flow in this time interval if charge on one electron is 1.6 10^-19 C?

A
3.75 10^-19

B
2.67 10^-20

C
3.75 10¹⁹

D
2.67 10^-18
Question 4
1 / -0

The current flowing in a conductor of resistance `R` ohm is `I` mpere. What amount of current will be flowing in a conductor, if the resistance of conductor is doubled keeping the potential difference across it the same?

A
2 I

B
4 I

C

D
Question 5
1 / -0

On which of the following factors does electrical resistivity of a given metallic wire depend?

A
Length

B
Thickness

C
Shape

D
Nature of the material
Question 6
1 / -0

A cylindrical conductor of length '' and uniform area of cross-section 'A' has resistance R. What will be the area of cross-section of another conductor of the same material but of length '2' and resistance 'R'?

A
A/2

B
4A

C
A/4

D
2A

Solution

since the material is same, hence volume of the cylinder remains constant:
and R' = R
therefore ;2l x A' = l x A
A' = A/2
Question 7
1 / -0

Electron volt is the unit of

A
energy

B
charge to mass

C
charge

D
potential difference
Question 8
1 / -0

When a fuse is rated 8 A, it means

A
it will not work if current is less than 8 A

B
it has a resistance of 8 ohm

C
it will work only if current is 8 A

D
it will burn, if current exceeds 8 A
Question 9
1 / -0

In a household circuitry, the appliances are connected in

A
series combination

B
parallel combination

C
series parallel combination

D
all of these
Question 10
1 / -0

An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?

A
1 A

B
2 A

C
4 A

D
5 A
Question 11
1 / -0

A 6V, 12 W lamp is connected in series with a resistor R and a source of 12 V supply. What is the value of the resistor R for the proper working of the lamp?

A
0.5

B
2

C
3

D
6
Question 12
1 / -0

An electric bulb is rated 220 V and 110 W. When it is operated on 110 V, what amount of power will be consumed?

A
55 W

B
27.5 W

C
220 W

D
20 W
Question 13
1 / -0

What is the current flowing into a microwave oven that requires 800 W of power if the potential difference is 220 V?

A
3.64 A

B
0.275 A

C
2.20 A

D
8.20 A
Question 14
1 / -0

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

A
both the pieces will lose their magnetism

B
one piece will act as North Pole and the other as South Pole

C
both the pieces will behave as complete magnets

D
one of the pieces will lose its magnetism
Question 15
1 / -0

The strength of an electromagnet can be influenced by

A
increasing the current through the wire

B
increasing the number of loops in the coil

C
changing the core of the coil

D
All of the above

Solution

The magnetic field strength of an electromagnet can be influenced by
(1) increasing the current through the wire
(2) increasing the number of loops in the coil
(3) changing the core of the coil, use of alnico can produce stronger magnetic field.
Hence, the correct answer is option (4).
Question 16
1 / -0

Three students A, B and C took a permanent magnet each and tried to damage it. Student A exposed it to a very high temperature, while student B hammered it strongly and student C dropped it from a very tall building.
The magnet of which of the following students is likely to be damaged?

A
Only A

B
Only B

C
Only C

D
A, B and C
Question 17
1 / -0

If `F` is the magnitude of force acting on a current (I) carrying conductor placed in a magnetic field in a direction perpendicular to it, then

A
F I^-1

B
F I²

C
F I

D
F I^-2
Question 18
1 / -0

The direction of force on a current carrying conductor placed in a magnetic field is obtained by

A
Fleming`s left hand rule

B
Fleming`s right hand rule

C
Right hand thumb rule

D
Maxwell`s rule
Question 19
1 / -0

How will the direction and magnitude of force be changed, if the current is reversed in the conductor placed in a magnetic field?

A
Direction of force will remain the same but its magnitude will be increased.

B
Direction of force and its magnitude will remain the same.

C
Direction of force will be reversed and its magnitude will be increased.

D
Direction of force will be reversed and its magnitude will remain the same.
Question 20
1 / -0

The diagram shows two coils, coil-1connected with a battery and coil-2 with a galvanometer as shown in the figure below. Current is induced in coil-2 when current in coil-1 is changed.

What happens to the needle of galvanometer if the current in the coil is increased?

A
The needle would stay the same.

B
The needle would point towards the left.

C
The needle would point more towards the right.

D
There would be no deflection in the galvanometer.