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.

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Electric Curren...

Question 1

Plastic

Copper

Iron

All of the above

Question 2

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.

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

Question 3

10 C

20 C

30 C

40 C

Question 4

they have the same quantity of charge

they are at the same potential

they have the same capacity

they have the same ratio of potential per unit charge

Question 5

1

2

4

6

10

Question 6

51.2 × 1019

5.12 × 1024

3.2 × 1019

2 × 1019

Question 7

The bell will start ringing louder.

The bell will not ring at all.

The strip will remain attached to the electromagnet.

Sometimes the bell will ring, sometimes it will not ring.

Question 8

3 103 V

4 104 V

5 104 V

6 103 V

Question 9

2.33 A

1.33 A

0.33 A

0.23 A

Question 10

Only (a)

Only (b) and (c)

Only (a) and (c)

Only (a) and (b)

Question 11

Electric bells

Loudspeaker

Cranes to pick up cars

All of these

Question 12

Because the wire gets overheated

Because the wire breaks the circuit and melts

Because the current-carrying wire behaves like a magnet

Because the wire is made of conductive material

Question 13

2 min and 40 seconds

6 min and 40 seconds

12 min

20 min

Question 14

4 C

6 C

7 C

8 C

Question 15

V/4

4V

V

Zero

None of these

User

Question Analysis

51.2 × 10¹⁹

5.12 × 10²⁴

3.2 × 10¹⁹

2 × 10¹⁹

3 10³ V

4 10⁴ V

5 10⁴ V

6 10³ V