CBSE
Guess and Guide Sample Paper
Class IX Science (Physics)
Time 3 Hours M.M.20
Q.1. What is persistence of hearing? [1]
Q.2. What does the slope of
speed-time graph indicate? [2]
Q.3. What is one Newton? [1]
Q.4. Why will a sheet of paper fall
lower than one that is crumpled into a ball? [2]
Q.5. A stone is dropped from the edge
of a roof. [4]
(a) How long does it take to fall
4.9m?
(b) How fast does it move at
the end of that fall?
(c) How does it move at the end
of 7.9m?
(d) What is its acceleration after 1 second
and after 2 second?
Q.6. A boy and a girl do the same
work in 5 min and 10 min respectively. Which of these has more power and why? [1]
Q.7. (a) What name has been given to
the force with which two objects lying a part attract each other?
(b) What happens to the gravitational
force between two objects when the distance between them is - (i) doubled (ii) half [2]
Q.8. (a) What is the condition for a
force to do work on a body?
(b)
A boy throws a rubber ball vertically upwards. What type of work,
positive or negative is done: (i) By force applied by boy? (ii) By the
gravitational force of earth? [3]
Q.9. Name the characteristics of
sound which depends on: (i) Amplitude (ii)
Waveform [1]
Q.10. Give one use of ultrasound in
industry and one in hospitals? [1]
Q.11. A sonar station picks up a
return signal after 3seconds. How far away is object? (speed of sound in
water=1440m/s) [1]
Q.12.
Name that part of ear which vibrates when outside sound fall on it? [1]
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