#### centum ten mark questions

10th Standard

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Science

Use blue pen alone
Time : 01:30:00 Hrs
Total Marks : 100

Part - A

Answer all the following questions

5 x 10 = 50
1. When a constant force acts of 10 s on a body of mass 10 kg, which is initially at rest, moves a distance of 500 cm in 10 s. Calculate the frictional force required to bring the body to rest.

2. A pistol fired a bullet of mass 50 g triggered with a speed 250 ms-1 penetrated into a wooden plank comes to rest at 1 ms. Find the impulse and average force offered by the planks.

3. Force of 50 N acts perpendicular on a body, which is fixed at a point O. The distance of point of action of force from O is 5 cm. Find the moment of force.

4. A person of weight 50 kg is moving down in an elevator Calculate downward acceleration offered by the elevator whose reaction force is 400 N on the surface.

5. Calculate the force of gravitation between two bodies of weight 50 kg and 10 kg respectively place at 10 m apart. If their distance increased to 100 % then find the change in percentage of force. (New force is 75% less than the original force)

6. Part - B

Answer all the following questions

5 x 10 = 50
7. State the universal law of gravitation and derive its mathematical expression

8. Give the applications of gravitation.

9. Two blocks of masses 8 kg and 2 kg respectively lie on a smooth horizontal surface in contact with one other. They are pushed by a horizontally applied force of 15 N. Calculate the force exerted on the 2 kg mass.

10. A heavy truck and bike are moving with the same kinetic energy. If the mass of the truck is four times that of the bike, then calculate the ratio of their momenta. (Ratio of momenta = 1:2)

11. “Wearing helmet and fastening the seat belt is highly recommended for safe journey” Justify your answer using Newton’s laws of motion.