set 5 MCQ Questions & Answers Detailed Explanation

Question : 1

An object is kept 5 cm in front of a concave mirror of focal length 15 cm. What will be the nature of the image?

a) Real, not magnified

b) Virtual, not magnified

c) Virtual, magnified

d) Real, magnified

Question : 2

Alternating current is converted to direct current

a) By Transformer

b) By Dynamo

c) By Motor

d) By Rectifier

Question : 3

In which one of the following cases Ohm’s law is not valid?

a) Junction diode

b) Wire bound resistor

c) Potentiometer

d) Electric bulb

Question : 4

Consider the following statements :

1. An ammeter should have low resistance
2. An ammeter should have high resistance
3. A voltmeter should have low resistance
4. A voltmeter should have high resistance

a) 2 and 3

b) 1 and 4

c) 1 and 3

d) 2 and 4

Question : 5

The heating element of an electric heater should be made with a material, which should have

a) high specific resistance and low melting point

b) low specific resistance and low melting point

c) high specific resistance and high melting point

d) low specific resistance and high melting point

Question : 6

The part of a transistor which is most heavily doped to produce large number of majority carriers is

a) base

b) collector

c) emmiter

d) can be any of the above three