Note- Take g = 10 m/s², wherever necessary

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1. A heavy box is solid across a rough floor with an initial speed of 4 m/s. It stops moving after 8 seconds. If the average resisting force of friction is 10 N, the mass of the box (in kg) is-

A. 40

B. 20

C. 5

D. 2.5

2. If a block moving up an inclined plane at 30° with a velocity of 5 m/s, stops after 0.5 s, then coefficient of friction will be nearly –

A. 0.5

B. 0.6

C. 0.9

D. 1.1

3. A metallic chain 1 m long lies on a horizontal surface of a table. The chain starts sliding on the table if 25 cm (or more of it) hangs over the edge of a table. The correct value of the coefficient of friction between the table and the chain is –

A. 1/3

B. 2/3

C. 1/4

D. 1/5

4. A block of mass m placed on an inclined plane of angle of inclination θ slides down the plane with constant speed. The coefficient of kinetic friction between block and inclined plane is –

A. sin θ

B. cos θ

C. tan θ

D. cosec θ

5. A horizontal force 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2, the weight of the block is –

A. 5 N

B. 7 N

C. 2 N

D. 10 N