set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

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 : 3

Water is flowing through a horizontal pipe line having a restriction. Then

a) pressure will be greater at the restriction.

b) pressure will be the same throughout the length of the pipe.

c) pressure will be greater in the wider portion.

d) None of these

Question : 4

The rain drops are spherical because

a) The air has resistance

b) The water has surface tension

c) They fall from big height

d) None of the above

Question : 5

Which of the following elements was first produced artificially?

a) Plutonium

b) Francium

c) Neptunium

d) Technetium

Question : 6

When an air bubble at the bottom of lake rises to the top, it will

a) Decreased in size

b) Maintain its size

c) Increased in size

d) Flatten into a disc like shape