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91
Light year is a measure of
Correct Option
Option A
Explanation
A light-year is the distance that light travels in one year, so it is a unit of distance.
92
On putting a capillary tube in a pot filled with water, the level of water rises upto a height of 4 cm in the tube. If a tube of half the diameter is used instead, the water will rise to a height of nearly
Correct Option
Option B
Explanation
Capillary rise h ∝ 1/r; halving the tube diameter (halving radius) doubles the height from 4 cm to about 8 cm.
93
If Young's modulus of iron is 2 × 10^11 N/m^2 and the interatomic spacing between two molecules is 3 × 10^-10 m, the interatomic force constant is
Correct Option
Option A
Explanation
Using the approximate relation k ≈ E·a, k = 2×10^11 × 3×10^-10 ≈ 60 N/m, matching option A.
94
The amount of a substance is measured in:
Correct Option
Option C
Explanation
Amount of substance is measured in moles; kilogram measures mass and litre measures volume.
95
S.I unit of intensity of light is:
Correct Option
Option D
Explanation
The SI base unit for luminous intensity is the candela, so option C is correct.
96
If we convert 1 m s^-1 into 1 km h^-1, then it is equal to
Correct Option
Option B
Explanation
1 m/s = (1×3600)/1000 = 3.6 km/h.
97
Steradian is the angle subtended at the centre of the:
Correct Option
Option B
Explanation
A steradian is defined as the solid angle subtended at the center of a sphere by a portion of its surface.
98
Which of the following is a set of supplementary units?
Correct Option
Option C
Explanation
The supplementary (geometrical) units in SI are the radian and steradian.
99
Two wires of the same material and radius but having lengths in the ratio of 1 : 2 are stretched with the same force. The ratio of the work done in two cases is
Correct Option
Option C
Explanation
With same force, extension is proportional to length, so work (½FΔL) ratios follow the length ratio 1:2.
100
In mean solar day, the number of seconds are:
Correct Option
Option C
Explanation
A mean solar day is 24 hours and 24 × 3600 = 86400 seconds.
