1.When salt is properly mixed with ice, the melting point of ice –
(a) is lowered
(b) is raised
(c) remains the same
(d) becomes infinite
2. Sound is produced when objects
(a) vibrate
(b) accelerated
(c) displaced
(d) frictionised
3. The sound travels fastest in
(a) solids
(b) liquids
(c) gases
(d) none of these
4. The unit to measure intensity of sound is
(a) decibel
(b) joule
(c) candulla
(d) none of these
5. Echo is a type of
(a) reflected sound
(b) refracted sound
(c) polarised sound
(d) none of these
6. Sound cannot travel though –
(a) solids
(b) liquids
(c) gases
(d) vacuum
7. One hertz is equivalent to –
(a) one cycle per second
(b) one second
(c) one meter per second
(d) one second per meter
8. The unit of frequency of sound is
(a) metre/second
(b) metre/second
(c) hertz
(d) none of these
9. Speed of sound at constant temperature depends on –
(a) Pressure
(b) Density of gas
(c) both (a) & (b)
(d) None of the above
10. The waves in which the particles of the medium vibrate in a direction perpendicular to the direction of wave motion is known as –
(a) Transverse wave
(b) Longitudinal waves
(c) Propagated waves
(d) None of these
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