set 5 MCQ Questions & Answers Detailed Explanation

Question : 1

At magnetic poles, the angle of dip is

a) zero

b) 45°

c) 30°

d) 90°

Question : 2

When electrical energy is converted into motion

a) Heat loss is 30 percent

b) There is no heat loss

c) Heat loss is 50 percent

d) Heat loss is 80 percent

Question : 3

Consider the following statements :

1. An ammeter is always connected in series in the circuit.
2. A voltmeter can only be connected in series in the circuit.
3. A voltmeter has low resistance.

a) 1 only

b) 1 and 2

c) 2 and 3

d) 3 only

Question : 4

Match list-I with list -II:

a) 2 1 4 3

b) 3 1 4 2

c) 3 4 1 2

d) 2 4 1 3

Question : 5

In a p-n junction

a) the p side is at higher electrical potential than n side

b) the n side is at higher electric potential than p side

c) the potential of p & n sides becomes higher alternately

d) both p & n sides are at same potential

Question : 6

Graphene is frequently in news recently. What is its importance?

1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and has high optical transparency.
4. It can be used as ‘conducting electrodes’ required for touch screens, LCDs and organic LEDs.

a) 1, 2 and 4 only

b) 1 and 2 only

c) 3 and 4 only

d) 1, 2, 3 and 4