Verified past-paper data not yet uploaded
No verified paper has been uploaded for PMS Paper Physics 2006 MCQs yet.
The MCQs below are drawn from the Physics subject category.
Showing 91–100
of 15721 MCQs
Page 10 / 1573
91
Light year is a measure of
A. Distance
B. Intensity of light
C. Velocity
D. Time
Discuss
Save
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
Discuss
Save
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
Discuss
Save
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
Discuss
Save
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
Discuss
Save
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
Discuss
Save
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
Discuss
Save
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
Discuss
Save
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
Discuss
Save
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
Discuss
Save
Correct Option
Explanation
A mean solar day is 24 hours and 24 × 3600 = 86400 seconds.
