set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

If the force on the surface is doubled and area is reduced to half, pressure will

a) become 3 times

b) become 2 times

c) become 4 times

d) remain unchanged

Question : 2

At which temperature density of water is maximum?

a) 0°C

b) – 4°C

c) 4°C

d) – 8°C

Question : 3

Four wires of same material and dimensions as mentioned below are stretched by a load of same magnitude separately. Which one of them will be elongated maximum?

a) Wire of 2 m length and 2 mm diameter

b) Wire of 3 m length and 1.5 mm diameter

c) Wire of 1 m length and 2 mm diameter

d) Wire of 1 m length and 1 mm diameter

Question : 4

Why does an iron nail float on mercury while it sinks in water?

a) Iron is heavier than water and lighter than mercury

b) Iron has greater density than water and lesser than mercury

c) Due to less chemical interaction of iron with mercury than it is with water

d) Mercury is heavier than water

Question : 5

According to Hooke’s law of elasticity, if stress is increased, then the ratio of stress to strain

a) remains constant

b) becomes zero

c) decreases

d) increases

Question : 6

For a fluid which is flowing steadily, the level in the vertical tubes is best represented by

a)

b)

c)

d)