set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

When the distance between the object and the plane mirror increases

a) the distance between the image and the plane mirror increases

b) the image remains same

c) the size of the image will become less than the size of the object

d) the distance between the image and the plane mirror decreases

Question : 2

When pressure on piece of ice is increases its melting point

a) increases

b) decreases

c) remains unchanged

d) first increases and then decreases

Question : 3

The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason ?

a) Since the surface of the lake is at the same temperature as the air, no heat is lost.

b) Ice is a bad conductor of heat.

c) The density of water is maximum at 4°C.

d) None of the statements (a), (b) and (c) given is correct.

Question : 4

In fibre optics communication, the signal travels in the form of

a) Micro wave

b) Radio wave

c) Light wave

d) Electric wave

Question : 5

Find out the odd colour from the following options.

a) Red

b) Brown

c) Green

d) Yellow

Question : 6

A Centigrade thermometer and Fahrenheit thermometer are dipped in boiling water. The temperature of water is lowered till the Fahrenheit thermometer registers half of its upper fixed point. What is the corresponding fall temperature registered by the Centrigrade thermometer?

a) Approximately 41°C

b) Half of its range of temperature between the upper and the lower fixed points

c) Approximately 59°C

d) 18°C