set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

A and B are two wires. The radius of A is twice that of B. They are stretched by the same load. Then the stress on B is

a) four times that on A

b) equal to that on A

c) two times that on A

d) half that on A

Question : 2

The lift of an air plane is based on

a) bernoulli’s theorem

b) Torricelli’s theorem

c) law of gravitation

d) conservation of linear momentum

Question : 3

The clouds float in the atmosphere because of their low

a) Velocity

b) Pressure

c) Temperature

d) Density

Question : 4

Consider the figure of a fountain with four holes, given below.Which one of the holes in the fountain will throw the water farthest?

a) 3

b) 2

c) 4

d) 1

Question : 5

In cold weather, aquatic animals survive even when water at the top layer of the lake freezes into ice because

a) They have enough of accumulated oxygen inside them

b) Their body structure is such that they can survive without oxygen

c) They can breathe in ice

d) Water has the highest density at 4°C so underneath the top layer of ice there is a layer of water

Question : 6

Two pieces of metal when immersed in a liquid have equal upthrust on them; then

a) both pieces must have equal densities

b) both pieces must have equal weights

c) both pieces must have equal volumes

d) both are floating to the same depth