341. A certain wire has a resistance R; the resistance of another wire identical to the first except for having twice its diameter is?
(A) R/2
C) R/4
(B) 4R
(D) 2R
342. Electron volt is a unit of?
(A) Momentum
(B) Charge
C) Energy
(D) Potential difference
343. The law that governs the force between electric charges bears the name of?
A) Coulomb
(B) Bernoulli
(C) Ampere
(D) Newton
344. The physics underlying the operation of a refrigerator most closely resembles the physics underlying?
(A) The melting of ice
B) A heat engine
(C) The evaporation of water
(D) The freezing of water
345. The energy of the molecular motion appears in the form of?
(A) Heat
(B) Potential energy
(C) Friction
D) Temperature
346. The smallest sub-division of a compound that exhibits its characteristic properties is called?
A) A molecule
(B) An atom
(C) An element
(D) An elementary particle
347. The ratio between the energy dissipated in some process and the heat that appears as a result is the?
(A) Specific heat
(B) Triple point
(C) Enthalpy
D) Mechanical equivalent of heat
348. The apparent weight of a mass 1 kg falling freely is?
A. 1 N
B. Zero
C. 9.8 N
D. 98 N
349. A man ‘P’ of mass 80 kg runs up the same staircase in 12 seconds. Another man ‘Q’ of mass 60 kg runs up the same staircase in 11 seconds. The ratio of the power of man ‘P’ to man ‘Q’ is?
A. 4/3
B. 12/11
C. 49/33
D. 11/9
350. A crane can raise a body of mass 10 kg vertically upward with a speed of 10 m/s. How powerful is its engine?
A. 980 W
B. 100 W
C. 986 W
D. None of them
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