Which of the following statements are correct?
(i) Sound is produced by vibrations.
(ii) Sound requires a medium for propagation.
(iii) Light and sound both require a medium for propagation.
(iv) Sound travels slower than light.
(a) i & ii only
(b) i, ii & iii only
(c) ii, iii & iv only
(d) i, ii & iv only
The loudness of sound depends on:
(a) its amplitude. (c) its time period.
(b) its frequency. (d) its speed.
A list of mediums is given below.
(i) wood (iii) air (ii) water (iv) vacuum
In which of these mediums can sound travel?
(a) i & ii only (b) i, ii & iii only (c) iii & iv only (d) ii, iii & iv only
While travelling on a rickshaw, you might have experienced that
if the seat cover is very smooth, you tend to slip when brakes are
applied suddenly. Explain.
We have two identical metal sheets. One of them is rubbed with
sand paper and the other with ordinary paper. The one rubbed
with sand paper shines more than the other. Give reason
When the cutting edge of a knife is put against a fast rotating
stone to sharpen it, sparks are seen to fly. Explain the reason.
A father and son pushed their car to bring it to the side of road
as it had stalled in the middle of the road. They experienced that
although they had to push with all their might initially to move
the car, the push required to keep the car rolling was smaller,
once the car started rolling. Explain.
A marble is allowed to roll down an inclined plane from a fixed
height. At the foot of the inclined plane, it moves on a horizontal
surface (a) covered with silk cloth (b) covered with a layer of sand
and (c) covered with a glass sheet. On which surface will the
marble move the shortest distance. Give reason for your answer
Explain why the surface of mortar and pestle (silbatta) used for grinding is etched again after prolonged use?
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