Q.32 Out of the following which is not emitted by radioactive substance?
(A) Electrons
(B) Electromagnetic radiations
(C) Alpha particles
(D) Neutrons
Q.33 Lux is the SI unit of
(A) intensity of illumination
(B) luminous efficiency
(C) luminous flux
(D) luminous intensity
Q.34 On a rainy day, small oil films on water show brilliant colours. This is due to
(A) dispersion
(B) interference
(C) diffraction
(D) polarization
Q.35 Point A is at a lower electrical potential than point B. An electron between them on the line joining them will.
(A) move towards A
(B) move towards B
(C) move at right angices to the line joining A and B
(D) remain at rest
Q. 36 Material for rain-proof coats and tents owe their water-proof properties to
(A) surface tension
(B) viscosity
(C) specific gravity
(D) elasticity
Q.37 RADAR is used for
(A) locating submerged submarines
(B) receiving a signal in a radio receiver
(C) locating geostationary satellites
(D) detecting and locating the position of objects such as airplanes
Q.38 Sound of frequency below 20 Hz is called.
(A) audio sounds
(B) infrasonic
(C) ultrasonic
(D) supersonics
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