Class IX Chapter : Gravitation Date of Taking Test : December 25, 2024 Time: 20 Minutes 1. Identify the correct statement with reference to universal law of gravitation. (a) F ∝ M/m (b) F ∝ m + M (c) F ∝ d (d) F ∝ 1/d2 None 2. The SI unit of universal gravitational constant, G is ____________ (a) Nm -2 kg -2 (b) Nm 2 kg 2 (c) Nm 2 kg -2 (d) Nm kg -2 None 3. If the distance between two bodies is decreased to 4 times, then the gravitational force between the bodies ___________. (a) remains unchanged (b) increases 4 times (c) decreases 4 times (d) becomes 16 times of initial value None 4. In universal law of gravitation, if d gets bigger by a factor of 5, F becomes __________ times smaller. (a) 1/5 (b) 1/10 (c) 1/25 (d) 1/50 None 5. Which of the following cannot be explained by universal law of gravitation? (a) Force that binds us to the earth (b) Motion of the moon around the earth (c) Floating of icebergs (d) Tides due to the gravitational force of moon and the Sun None 6. Identify the statement which is not true for an object falling towards the earth? (a) There is no change in the direction of motion of the object (b) There will be a change in the magnitude of the velocity (c) There will be no change in the magnitude of the velocity (d) There will be an acceleration in the motion of the object None 7. Which of the following statement is not true for mass? (a) Greater the mass, the greater is the inertia (b) Mass remains the same everywhere (c) Mass is independent of gravitational pull. (d) Mass of an object changes from place to place None 8. The ____________ of an object is the force with which it is attached towards the earth. (a) mass (b) weight (c) density (d) volume None 9. At a given place, the weight of an object is ___________ (a) directly proportional to the mass (b) inversely proportional to square of the mass (c) directly proportional to square of the mass (d) inversely proportional to the mass None 10. The weight of an object on the moon is the force with which the ___________ attracts that object. (a) Jupiter (b) sun (c) moon (d) earth None 11. Identify the incorrect statement. (a) A solid exerts pressure on a surface due to its weight (b) Fluids have weight, and they also exert pressure on the base of the container (c) Fluids exert pressure on the walls of the container (d) Pressure exerted in any confined mass of fluid is transmitted undiminished in lateral directions. None 12. Observe the diagram carefully and choose the correct option (a) The downward force acting on the nail is greater than the upthrust of water on the nail (b) The upward force acting on the nail is greater than the downward force acting on the nail. (c) There is no net force acting on the nail and the cork (d) The net force on the iron nail and the cork is in the same direction. None 13. Observe the given diagram and identify the correct relation (a) Density of cork > Density of water (b) Density of cork > Density of iron nail (c) Density of iron nail > Density of water (d) Density of iron nail < Density of water None 14. Objects of density less than that of a liquid ___________ on the liquid. The objects of density greater than that of a liquid _________ in the liquid. (a) float, sink (b) float, float (c) sink, float (d) sink, sink None 15. A solid of density 800 kg/m3 floats in oil as shown. The oil floats on liquid of density 900 kg/m3 as shown. The density of oil in kg/m3 could be (a) 850 (b) 900 (c) 950 (d) 1050 None 16. Assertion (A): Gravitational force can be attractive or repulsive Reason (R): Gravitational force acts between all the bodies which have mass. (a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true and R is NOT the correct explanation of A (c) A is true but R is false (d) A is false but R is true None 17. Assertion (A): Gravitational force between two bodies decreases with increase in distance between them. Reason (R): Gravitational force is inversely proportional to the square of the distance between two bodies. (a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true and R is NOT the correct explanation of A (c) A is true but R is false (d) A is false but R is true None 18. Assertion (A): The S.I. unit of universal gravitational constant is Nm2kg -2 Reason (R): The value of universal gravitational constant is 6.7 x 10 -11 Nm2kg -2 (a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true and R is NOT the correct explanation of A (c) A is true but R is false (d) A is false but R is true None 19. Assertion (A): Weight of an object is a constant. Reason (R): Weight of an object is the force with which the earth attracts that object towards itself. (a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true and R is NOT the correct explanation of A (c) A is true but R is false (d) A is false but R is true None 20. Assertion (A): An iron ship sails on water whereas an iron nail sinks Reason (R): When a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it. (a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true and R is NOT the correct explanation of A (c) A is true but R is false (d) A is false but R is true None 1 out of 1 Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Name * Email * Website Comment * Save my name, email, and website in this browser for the next time I comment.