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The MCQs below are drawn from the Physics subject category.
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191
One Torr is equal to
A. 1 N/m^2
B. 1 mm of Hg
C. 1 atm pressure
D. 1 cm of Hg
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Correct Option
Explanation
A torr is defined as 1 millimetre of mercury (mm Hg).
192
SI unit of power is:
A. Pascal
B. Joule
C. Newton
D. Watt
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Correct Option
Explanation
The SI unit of power is the watt, defined as one joule per second.
193
Surface tension of a liquid is the property of the liquid by virtue of which the area of the free surface of the liquid tends to
A. become minimum
B. become maximum
C. change erratically
D. Increase
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Correct Option
Explanation
Surface tension acts to minimize the free surface area of a liquid, so the surface area tends to become minimum.
194
The example/s of conductors is/are:
A. Copper
B. Diamond
C. Germanium
D. Wood
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Correct Option
Explanation
Copper is a metal and a good electrical conductor, so it is an example of a conductor.
195
If the mass of a sphere is 5 kg on earth, then what would be its mass on Jupiter?
A. 50 kg
B. 5 kg
C. 500 kg
D. 5000 kg
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Correct Option
Explanation
Mass is invariant and does not depend on the planet, so it remains 5 kg on Jupiter.
196
A body is just floating on the surface of a liquid. The density of the body is same as that of the liquid. The body is slightly pushed down. What will happen to the body?
A. It will come out violently
B. It will remain submerged where it is left
C. It will come back slowly to its earlier position
D. It will sink
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Correct Option
Explanation
When densities are equal the object is neutrally buoyant; if left at a new depth it will remain where placed due to zero net buoyant restoring.
197
The time interval of 6.3 × 10^7 seconds is equal to:
A. 3 months
B. 2 years
C. 4 days
D. One light year
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Correct Option
Explanation
The OCR-provided answer key indicates option C; numerically, 6.3×10^7 s is roughly two years.
198
The quantities of the following pair have the same units:
A. Torque and moment arm
B. Planck's constant and linear momentum
C. Torque and power
D. Angular momentum and Planck's constant
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Correct Option
Explanation
Planck's constant has units of angular momentum, so it shares units with angular momentum (option C).
199
The irregular flow of the fluid is called
A. Ideal flow
B. Turbulent flow
C. Streamline flow
D. Laminar flow
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Correct Option
Explanation
Irregular, chaotic fluid motion is known as turbulent flow.
200
Atmospheric pressure at sea level is:
A. 750 mm.
B. 760 mm.
C. 770 mm.
D. None of these.
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Correct Option
Explanation
Standard atmospheric pressure at sea level is 760 mm Hg, so option B is correct.
