CLASS 9 / REVISION WORKSHEET -1

CLASS 9 / REVISION WORKSHEET-1 / PHYSICS

PREVIOUS YEAR QUESTION PAPER’S QUESTIONS 

(2013-14)

1. Which face of cuboid of ‘15 cm x 10 cm x 5 cm’will exert maximum and minimum pressure? What will be the pressure in each case if weight of block is 5 Kg. (3 M)

2. a) Define 1 watt.
b) An electric bulb of 60 watts is used for 6 hrs per day. Calculate the units of energy consumed in one day by the bulb.( 2 M)

3. Draw a diagram of inner part of the ear and label important parts of it.( 3 M)

4. How can you find buoyant force acting on a stone when fully immersed in water?(2 M)

5. Which will exert more pressure – person standing on one leg or person standing on two legs? Why?(2 M)

6. A strong transverse horizontal pulse, created at one end of the string, is observed to complete 5 journey along its length, before fading out. The initial reading of stopwatch was 5 s and final reading was 55 s. if the length of the string for one journey is ‘L’ meter. Find the speed of the pulse through the string? (2 M).

7. a) State Archimedes's principal. What are it’s applications?
b) Why does a block of plastic release under water comes up to the surface of water?(3 M)

8. a) Define buoyancy.
b) A solid body of mass 150 g occupies 60 cm cube volume. Will the solid sink or float? If density of water is 1 g cm-3. (3 M)

9. What do you understand by intensity of sound? How is it different from loudness? Determine the wavelength of an ultrasonic wave of frequency 4.2 MHz. The speed of the wave is 1.7 Km s-1. (5 M)

10. a) What is SONAR? Write its full form.
b) How does a SONAR detects the depth of submerged objects?
c) Which property determines pitch of sound?(5 M)

11. a) Define work and its unit also.
b) the kinetic energy of an object of mass ‘m’moving with a velocity of 5 m/s is 25 J. What will be its kinetic energy if its velocity is doubled? What will be its kinetic energy when velocity is increased by three times? (5 M)

(2014-15)

12. Calculate the electric energy consumed in joules if a toaster of 60 W is used for 30 minutes.(2 M)

13. What type of a waves are produced in a slinky when it is stretched along its length and released? What kinds of a wave are produced in a violin?(2 M)

14. A force of 400 N acts on a surface of 25 square centimeter. Calculate thrust and pressure. Calculate the change pressure if now the thrust is 600 N.( 3 M)

15. a) Define Power..
b) Work done.
c) Kinetic energy.

16. a) Explain the working of SONAR.
b) A radar signal is reflected by an aeroplane and is received after 2 x 10-5 sec. If the speed of these waves is 3 x 108 m/s. How far is the aeroplane from radar?(3 M).

17. An object of mass 10 Kg is dropped from a height of  100 cm. Find its: kinetic energy and velocity, it just reaches the ground( g = 10) (3 M)

18. a) Define relative density. Give its mathematical formula.
b) Define density. Give its S.I. unit.
c) A solid weighs 80 g in air, 64 g in water. Calculate the relative density  of object. When kept in water, state if the object will sink or float?( 5 M)

19. a) Define the work done. Write its S.I. unit and define its S.I. unit.
b) A 3000 Kg truck moving at a speed of 90 m/s stops after covering some distance. The force applied by the brakes is 27000 N. Compute the distance covered and work done by this force.( 5 M)

(2015-16)

20. Differentiate between kinetic and potential energy. Give one example of each.(2 M)

21. Define quality of sound. What type of waves are produced in air, when a piano is played? (2 M)

22. a) Explain why a completely immersed closed empty bottle in water when released bounces back on surface.
b) Why does a bucket of water weighs less inside the well? ( 3 M)

23. a) State the laws of reflection of sound.
b) For hearing the loudest ticking sound of the table clock, what should be the angle x?
c) What is the value of angle of incident?(3 M)

24. In a house 2 bulbs of 50 W each are used for 5 hrs a day and 70 W each fans are used 10 hrs a day. Calculate the units consumed in a month of 30 days.( 3 M)

25. a) What is upthrust?
b) write applications of – lactometer and hydrometer.( 3 M)

26. a) Define power. Give its units.
b) A moving body of mass 20 Kg has 40 J of kinetic energy. Calculate its speed.
c) A person carrying a load of 20 Kg climbs 4 m in 10 sec. Calculate work done and its power.( 5 M)

27. a) A particular transmitter of akashvani broadcasts at 420.5  m wavelength. Given the speed of radio waves 3 x 108 m/s. Calculate the frequency at which the radio station broadcasts the program.
b) what is the direction of oscillation of the medium particles through which:
I. transverse wave is propagating
II. longitudinal wave is propagating?
III. Give one example of each.(5 M)