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91
Light year is a measure of
A. Distance
B. Intensity of light
C. Velocity
D. Time
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Correct Option
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
A. 2 cm
B. 8 cm
C. 4 cm
D. 11 cm
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Correct Option
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
A. 60 N/m
B. 3 N/m
C. 180 N/m
D. 120 N/m
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Correct Option
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:
A. Kilogram
B. Litre
C. Mole
D. Both A and C
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Correct Option
Explanation
Amount of substance is measured in moles; kilogram measures mass and litre measures volume.
95
S.I unit of intensity of light is:
A. Mole
B. Joule
C. Ampere
D. Candela
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Correct Option
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
A. 36 km h^-1
B. 3.6 km h^-1
C. 72 km h^-1
D. 7.2 km h^-1
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Correct Option
Explanation
1 m/s = (1×3600)/1000 = 3.6 km/h.
97
Steradian is the angle subtended at the centre of the:
A. Circle
B. Sphere
C. Square
D. Any of these
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Correct Option
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?
A. Steradian and candela
B. Radian and mole
C. Radian and steradian
D. Radian and kelvin
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Correct Option
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
A. 2:1
B. 1 : 8
C. 1 : 2
D. 1 : 3
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Correct Option
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:
A. 24 seconds
B. 3600 seconds
C. 86400 seconds
D. 1440 seconds
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Correct Option
Explanation
A mean solar day is 24 hours and 24 × 3600 = 86400 seconds.
