set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

A 100 watt electric bulb is used for 10 hours. What will be the cost of electricity consumed, if the consumption cost is Rs.5 per unit?

a) Rs.25

b) Rs.5

c) Rs.10

d) Rs.50

Question : 2

An object is placed at the focus of a concave mirror. The image will be

a) virtual, inverted, highly enlarged at infinity

b) real, inverted, same size at the focus

c) real, upright, same size at the focus

d) real, inverted, highly enlarged at infinity

Question : 3

Of the two bulbs in a house, one glows brighter than the other. In this context which of the following statements is correct?

a) The bright bulb has larger resistance

b) The brightness does not depend on the resistance

c) Both the bulbs have same the resistance

d) The dim bulb has larger resistance

Question : 4

Lenz’s law is a consequence of the law of conservation of

a) mass

b) energy

c) charge

d) momentum

Question : 5

The laws of electromagnetic induction have been used in the construction of a

a) voltmeter

b) electric motor

c) galvanometer

d) generator

Question : 6

The resistivity of a wire depends on

a) area of cross-section

b) material

c) length

d) all of these