Electric Current and its Effects Test

Directions For Questions

Directions: Read the paragraph given below and answer the following question.

An electric source powers the electromagnet used in an electric bell. The switch which you press to sound an electric bell acts as the circuit breaker or the switch which completes the circuit.

When the switch (K) is pressed, the circuit loop is complete, which causes current to flow through the circuit. The arm (A) which strikes the gong (B) is connected to a spring (T) at one end and an iron ball at the other end. This is called a clapper or a striker. The arm is attached to an iron strip (I) which is attracted to the electromagnet (E) when the circuit is complete and current is flowing through it.

This is because the magnetic field created by the electromagnet attracts the iron strip towards it when the circuit is complete.

...view full instructions

Column I	Column II
(a) Bulb	(i) Electromagnet
(b) Crane	(ii) Heater coil
(c) Electric iron	(iii) Filament

Battery	Connecting Wire
(1) Between R and S	Between Q and T
(2) Between Q and S	Between R and S
(3) Between Q and R	Between S and T
(4) Between Q and T	Between R and S

	P	Q	R
(1)	Brass	Soft Iron	Steel Spring
(2)	Soft Iron	Brass	Soft Iron
(3)	Soft Iron	Soft Iron	Steel Spring
(4)	Steel	Brass	Copper Spring

Electric Curren...

Question 1

less current flows through the wire as compared to the filament

the wire has more resistance than the filament

the wire has less resistance than the filament

the filament element has a coating of fluorescent material on it

Question 2

The electric cell will burn due to large amount of current.

The chemicals in the electric cell get used up very fast.

The electric cell, due to the flow of large amounts of current, gets corroded.

All of the above

Question 3

increasing the current through the wire

increasing the number of loops in the coil

changing the core of the coil

All of the above

Question 4

There should be a temperature difference between the two points.

There should be a potential difference between the two points.

Both the points must be at the same potential.

Electrons can even flow without any temperature or potential differences between the two points.

Question 5

by rubbing certain types of materials against each other

by means of chemical reactions

using magnetic influence on conductors

All of these

Question 6

Both statement A and statement B are correct.

Statement A is correct, but statement B is incorrect.

Statement A is incorrect, but statement B is correct.

Both statements A and B are incorrect.

Question 7

it will not work if current is less than 8 A

it has a resistance of 8 ohms

it will work only if current is 8 A

it will burn if current exceeds 8 A

Question 8

low cost

high melting point

high electrical conductivity

low thermal conductivity

Question 9

A and B only

B and C only

A, C, and D only

All of them

Question 10

Close - S1, Close - S2, Open - S3, Open - S4

Close - S1, Open - S2, Close - S3, Open - S4

Open - S1, Close - S2, Open - S3, Close - S4

Close - S1, Open - S2, Open - S3, Close - S4

Question 11

A and C

C and D

A and D

No bulb will glow.

Question 12

A

B

C

D

Question 13

(a) - (iii), (b) - (ii), (c) - (i)

(a) - (i), (b) - (ii), (c) - (iii)

(a) - (iii), (b) - (i), (c) - (ii)

(a) - (ii), (b) - (iii), (c) - (i)

Question 14

(1)

(2)

(3)

(4)

Question 15

(1)

(2)

(3)

(4)

Question 16

The resistivity of the wire used in a heater element is high, while a fuse wire has low resistivity.

The resistivity of the wire used in a heater element is low, while a fuse wire has high resistivity.

The melting point of the wire used in a heater element is high, while a fuse wire has low melting point.

Close - S₁, Close - S₂, Open - S₃, Open - S₄

Close - S₁, Open - S₂, Close - S₃, Open - S₄

Open - S₁, Close - S₂, Open - S₃, Close - S₄

Close - S₁, Open - S₂, Open - S₃, Close - S₄