A. to produce parallel beams of light
B. to filter the light rays
C. to make them
D. no function
Related Mcqs:
- A mass spectrograph (spectrometer) sorts out____________?
A. Molecules
B. Ions
C. Elements
D. Isotopes - Unit of power of a lens is________________?
A. meter
B. watt
C. diopter
D. horsepower - The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is________________?
A. 30°
B. 60°
C. 90°
D. 120° - The charge on alpha particles is________________?
A. Plus one
B. Plus two
C. Minus two
D. Minus one - Velocity of fluid increases where the pressure is________________?
A. Low
B. High
C. Constant
D. Changes continuously - The waveform of S.H.M. is________________?
A. Standing wave
B. Sine wave
C. Square wave
D. None - 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 - A photon is________________?
A. A unit of energy
B. A positively charged particle
C. A quantum of electromagnetic radiation
D. A unit of wavelength - In a half-wave rectifier the r.m.s. value of the A.C. component of the wave is________________?
A. Equal to D.C. value
B. More than D.C. value
C. Less than D.C. value
D. Zero - The work done in the isochoric process is________________?
A. constant
B. variable
C. zero
D. depends on situation
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