Electric Current and its Effects Test

Result

Electric Current and its Effects Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Match the two columns and select the correct option.

Column I Column II

(a) Bulb (i) Electromagnet

(b) Crane (ii) Heater coil

(c) Electric iron (iii) Filament

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

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

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

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

Solution

Bulb contains filament, crane uses electromagnet and electric iron has heating element.
Question 2
1 / -0

What is the difference between the wires used in the elements of an electric heater and a fuse?

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

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

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

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

Solution

A fuse wire should have high resistivity and low melting point as fuse melts down to protect the electrical appliances by breaking the circuit when current more than the permissible value passes through it. The wire used in a heater element has high resistivity and high melting point as the heat produced in the element due to large resistivity (hence large resistance) is used to heat the water.
Question 3
1 / -0

What will happen to the strength of magnetic field if we increase the radius of the solenoid?

A
Will increase

B
No change

C
Will decrease

D
Will first increase and then become constant

Solution

Magnetic field inside the solenoid will decrease if we increase the radius of the solenoid.
Question 4
1 / -0

In which of the following is an electromagnet used?

A
Electric bells

B
Loudspeaker

C
Cranes to pick up cars

D
All of these

Solution

When a soft iron bar is placed inside a solenoid carrying current, it becomes a magnet as long as current flows through the solenoid. Such a magnet is known as an electromagnet. They are used to lift heavy iron pieces. They are fitted on cranes, which lift heavy masses of scrap iron.
They are also used in many devices, like electric bell, electric horn, telephone receiver, electric relay, microphones, television, loudspeakers, etc.
Question 5
1 / -0

Four cells, each of voltage `V` across them, are joined in parallel to form a battery. What will be the equivalent voltage of the battery?

A
V/4

B
4V

C
V

D
Zero

Solution

As the four cells are connected in parallel, the voltage remains the same whatever is the number of cells connected.
Hence, the equivalent voltage will be V.