set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Assertion (A):
When a ship enters a sea from a river, it rises a little.
Reason (R):
The density of sea water is greater than that of river water.
In the context of the above statements, which of the following is true?

a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true

Question : 2

The load verses elongation graph for four wires is shown. The thinnest wire is

a) b

b) a

c) c

d) d

Question : 3

The maximum density of water is at

a) 277 Kelvin

b) 273 Kelvin

c) 373 Kelvin

d) 269 Kelvin

Question : 4

Assertion (A):
An iron ball floats on mercury but gets immersed in water.
Reason (R):
The specific gravity of iron is more than that of mercury.
Code

a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true