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The MCQs below are drawn from the Physics subject category.
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101
86. One Poise is equal to
A. 0.01 N-s/m2
B. 0.1 N-s/m2
C. 10 N-s/m2
D. 1 N-s/m2
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Correct Option
Explanation
1 Poise = 0.1 Pascal-second (Pa·s) and since Pa·s = N·s/m2, one poise equals 0.1 N·s/m2.
102
The temperature scale approved in SI units is:
A. Celsius scale
B. Kelvin scale
C. Fahrenheit scale
D. None of these
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Correct Option
Explanation
The SI unit for thermodynamic temperature is the Kelvin scale.
103
A wooden cube floats in water partially immersed. When a 200 gm weight is put on the cube, it is further immersed by 2 cm. The length of the side of cube is (Assume ρo < ρwater)
A. 15 cm
B. 20 cm
C. 10 cm
D. 25 cm
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Correct Option
Explanation
Added weight 0.2 kg displaces volume 200 cm³; with 2 cm extra immersion the base area is 100 cm², so side = √100 = 10 cm.
104
One newton is a force that produces an acceleration of 0.5 m/sec^2 in a body of mass:
A. 8 kg
B. 4 kg
C. 2 kg
D. 3 kg
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Correct Option
Explanation
Using F = ma, m = F/a = 1/0.5 = 2 kg, so option A is correct.
105
Time taken by light from Sun to reach Earth is:
A. 600 seconds
B. 400 seconds
C. 700 seconds
D. 500 seconds
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Correct Option
Explanation
Light takes about 8.3 minutes to travel from the Sun to Earth, which is approximately 500 seconds.
106
Bernoulli's equation includes as a special case
A. Torricelli's law
B. Hooke's law
C. Pascal's law
D. Archimede's principle
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Correct Option
Explanation
Torricelli's law (relation between efflux speed and head) is derived from Bernoulli's equation as a specific application.
107
The SI unit of stress is
A. N
B. N·m⁻¹
C. Pa
D. N·m⁻³
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Correct Option
Explanation
Stress is force per unit area with SI unit pascal (Pa), so option D is correct.
108
A uniform rod suffers a longitudinal strain of 2 x 10 ~. The Poisson's ratio of the material of the rod is 0.50. The percentage change in volume is
A. 0.1
B. 0.6
C. 0.2
D. zero
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Correct Option
Explanation
Fractional volume change ≈ ε(1 - 2ν); with ν = 0.5 this becomes zero, so percentage change is zero.
109
Pascal is a unit of:
A. Pressure
B. Power
C. Intensity of light
D. Magnetic field
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Correct Option
Explanation
The pascal (Pa) is the SI unit of pressure, equal to one newton per square meter.
110
179. Length can not be measured by
A. debye
B. light year
C. micron
D. fermi
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Correct Option
Explanation
The debye is a unit of electric dipole moment, not length; the other options are units of length, so B is correct.
