Class 9 Physics ICSE important question set1

1. Calculate the frequency of oscillation of Second’s pendulum. Does it depend upon the amplitude of oscillation?
2. Under what condition, the balance is in equilibrium?
3. The ratio of the velocities of two bodies thrown in an upward direction is 2:5. Prove that the ratio of their height attained will be h1:h2 = 4:25.
4. The walls of a barber shop are covered with a plane mirror and two movie films are made one recording the movements of the barber and the other of his mirror image. From viewing the films later, can an observer differentiate between the object and the image?
5. A ray of light is incident on a plane mirror at an angle of incidence of 50 degree. What is the angle (i) of reflection (ii) between the incident ray and the mirror (iii) between the reflected ray and the mirror (iv) of deviation (angle between the directions of the incident ray and the reflected ray)?
6. Define pitch of a screw gauge.
7. The thimble of a screw gauge has 50 divisions for one revolution. The spindle advances 1 mm when the screw is turned through two revolutions. What is the least count of the screw gauge? When the screw gauge is used to measure the diameter of the wire, the reading on the sleeve is found to be 0.05 cm and the reading on the thimble is found to be 27 divisions. What is the diameter of the wire in the CGS unit?
8. Ram throws a stone in the pond. It displaced 1.5 kg of water. Calculate the buoyant force acting on the stone. (g = 9.8 m/s2)
9. Write any two uses of convex mirrors.
10. A ray of light AB is inclined on a plane mirror M1M2 at an angle of 70degree from the mirror. The mirror turns through an angle of 10degree in the clockwise direction. Draw the ray diagram showing the new reflected ray and determine the angle between the incident ray and the final reflected ray.
11. A person standing on a ice at a place A in a freeze pond. He has a pistol and two bullets . How can he move from Place A to Place B and stop there ?

Important Question for class 9 Math ICSE Board. Set1