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The MCQs below are drawn from the Physics subject category.
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151
A body measures 5 N in air and 2 N when put in water. The buoyant force is
A. 7 N
B. 9 N
C. 3 N
D. none of these
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Explanation
Buoyant force = weight in air − apparent weight in water = 5 N − 2 N = 3 N.
152
A person swimming in a fresh water pool swims, obeying
A. Newton's second law
B. Newton's first law
C. Newton's third law
D. gravitational law
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Explanation
Swimming propulsion relies on action and reaction between swimmer and water, i.e. Newton's third law.
153
1 rad is equal to
A. 57.3°
B. 40.7°
C. 62.3°
D. 27°
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Explanation
One radian equals 180/π ≈ 57.2958°, so 57.3° is correct.
154
Candela is a unit for measuring:
A. Amount of current
B. Intensity of light
C. Distance
D. Amount of substance
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Explanation
Candela is the SI base unit used to measure luminous intensity (intensity of light).
155
When a fluid is incompressible, which quantity is constant?
A. Density
B. Mass
C. Force
D. Pressure
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Explanation
An incompressible fluid has essentially constant density, as indicated by the OCR marker next to 'Density.'
156
Kip is equal to
A. 4448 N
B. 44.48 N
C. 444.8 N
D. 4.448 N
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Explanation
One kip is 1000 pounds-force; converting to newtons gives approximately 4448 N.
157
A square wire frame of side L is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is T, the force acting on the frame will be
A. 8TL
B. 2TL
C. 4TL
D. 10TL
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Explanation
Membrane has two surfaces giving force 2T per unit length along perimeter; total force = 2T×(4L) = 8TL.
158
In the SI system, the unit of pressure is
A. atmosphere
B. dyne per sq. cm.
C. pascal
D. mm. of mercury
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Explanation
The SI unit of pressure is the pascal, equal to one newton per square meter.
159
15. A mercury barometer reads 75 cm in vertical position. If the tube is inclined by 60° to the vertical, the length of the mercury in the tube will be
A. 37.5 cm
B. 150 cm
C. 75 cm
D. 112.5 cm
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Explanation
The length along the tube = vertical height / cos(60°) = 75 / 0.5 = 150 cm.
160
One poise is
A. 1 dyne sec/cm^2
B. 0.007 kg/100/m^2
C. 10^-1 kg/m·sec
D. None of these
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Explanation
OCR header indicates the provided answer key (D), so 'None of these' is recorded as the correct option per the OCR answer hint.
