401. Which one of the following radiations has the strongest photon?
A. T.V waves
B. Microwaves
C. X-rays
D. γ-rays

402. 0.001 kg mass will be equivalent to_________________?
A. 2.50 GWh
B. 25.00 GWh
C. 0.26 GWh
D. 250 GWh

403. Mark the wrong statement ?
A. a frame of reference which is either at rest or moves with a constant velocity is called an inertial frame of reference
B. an un-accelerated frame of reference is called an inertial frame of reference
C. all the frames of reference in uniform rectilinear motion are equivalent
D. Newtons laws of motion are valid in an accelerated (non inertial) frame of reference

404. An observer shoots parallel to a meter stick at very high (relativistic) speed and finds that the length of meter stick is________________?
A. greater than one meter
B. less than one meter
C. one meter
D. a foolish question

405. Linear momentum of a photon is_______________?
A. zero
B. hv/c2
C. hv/c
D. c2/hv

406. The linear momentum of an X-ray photon of wavelength 0.1A is_______________?
A. 6.625x1023N-s
B. 66.25x1023N-s
C. 662.5x1023N-s
D. data is insufficient

407. Stopping potential for a metal surface in case of photoelectric emission depends on_____________?
A. the threshold frequency for the metal surface
B. the intensity of incident light
C. the frequency of incident light and work function of the metal surface
D. all of the above

408. The existence of Ether wind was experimentally rejected by__________________?
A. equal to its rest mass
B. double of its rest mass
C. infinite
D. zero

409. Select an alternative from of uncertainly principle from the following_______________?
A. ∆E = h/m∆c(1-cosθ)
B. ∆E . ∆t = h
C. mc2 = hv
D. Any of above

410. If a material object moves with speed of light its mass becomes ________________?
A. equal to its rest mass
B. double of its rest mass
C. infinite
D. zero

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