31) A jet engine works on the principle of conservation of
a) Linear momentum
b) Angular momentum
c) Energy Mass
d) Mass Velocity
32) The rotational effect of a force on a body about an axis of rotation is described in terms of the
a) Centre of gravity
b) Centripetal force
c) Centrifugal force
d) Moment of force
33) Identify the vector quantity from the following
a) Heat
b) Angular momentum
c) Time
d) Work
34) On a cold day when a room temperature is 15 DEGREE C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15 DEGREE C, because
a) metals have higher thermal capacity than plastics
b) plastics have a lower density than metals
c) metals are good conductor of heat
d) plastics have a higher thermal conductivity than metals
35) Which instrument is used to measure curvature of spherical objects ?
a)Spectroscope
b)Spherometer
c)Spectrometer
d)Sextant
36) Which instrument is used to record physical happenings at a distant place ?
a)Thermostat
b)Tonometer
c)Telemeter
d)Transponder
37) Which instrument is used in submarine to see the objects above sea level ?
a)Pykometer
b)Polygraph
c)Photometer
d)Periscope
38) Name of the instrument to measure atomspheric pressure ?
a)Barometer
b)Barograph
c)Bolometer
d)Callipers
39) What is refractive index ?
a)it is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
b)it is defined as the ratio of speed of light in vacuum to the speed of light in the medium .
c)it is defined as the product of speed of light in medium and in vacuum.
d)None of above
40) Young’s modulus is the property of
a) Gas only
b) Both Solid and Liquid
c) Liquid only
d) Solid only