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MCQOPTIONS
This section includes 23 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Kinematics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A wooden block is kept on a polished wooden plank and the inclination of the plank is gradually increased. It is found that the block starts slipping when the plank makes an angle of 18° with the horizontal. However, once started the block can continue with uniform speed if the inclination is reduced to 15°. Find the coefficient of kinetic friction between the block and the plank. |
| A. | tan 180 |
| B. | tan 150 |
| C. | tan 330 |
| D. | tan 30 |
| Answer» C. tan 330 | |
| 2. |
A wooden block is kept on a polished wooden plank and the inclination of the plank is gradually increased. It is found that the block starts slipping when the plank makes an angle of 18° with the horizontal. However, once started the block can continue with uniform speed if the inclination is reduced to 15°. Find the coefficient of static friction between the block and the plank. |
| A. | tan 180 |
| B. | tan 150 |
| C. | tan 330 |
| D. | tan 30 |
| Answer» B. tan 150 | |
| 3. |
A boy (30 kg) sitting on his horse whips it. The horse speeds up at an average acceleration of 2.0 m/s 2.If the boy slides back during the acceleration, what can be said about the coefficient of static friction between the horse and the boy. |
| A. | 0.1 |
| B. | 0.20 |
| C. | 0.30 |
| D. | 0.40 |
| Answer» C. 0.30 | |
| 4. |
A boy (30 kg) sitting on his horse whips it. The horse speeds up at an average acceleration of 2.0 m/s 2.If the boy does not slide back, what is the force of friction exerted by the horse on the boy ? |
| A. | 20 N |
| B. | 30 N |
| C. | 40 N |
| D. | 60 N |
| Answer» E. | |
| 5. |
A heavy box of mass 20 kg is pulled on a horizontal surface by applying a horizontal force. If the coefficient of kinetic friction between the box and the horizontal surface is 0.25, find the force of friction exerted by the horizontal surface on the box. |
| A. | 29 N |
| B. | 39 N |
| C. | 49 N |
| D. | 59 N |
| Answer» D. 59 N | |
| 6. |
A body of mass 400 g slides on a rough horizontal surface. If the frictional force is 3.0 N, find the magnitude of the contact force. |
| A. | 5 N |
| B. | 10 N |
| C. | 15 N |
| D. | 20 N |
| Answer» B. 10 N | |
| 7. |
A body of mass 400 g slides on a rough horizontal surface. If the frictional force is 3.0 N, find the angle made by the contact force on the body with the vertical. |
| A. | 350 |
| B. | 360 |
| C. | 370 |
| D. | 380 |
| Answer» D. 380 | |
| 8. |
The magnitude of the limiting friction (F ) bears a constant ratio to the normal reaction (RN) between the two surfaces. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
The magnitude of the force of friction is ____________ to the force, which tends the body to move. |
| A. | equal |
| B. | different |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» B. different | |
| 10. |
A_BODY_OF_MASS_400_G_SLIDES_ON_A_ROUGH_HORIZONTAL_SURFACE._IF_THE_FRICTIONAL_FORCE_IS_3.0_N,_FIND_THE_MAGNITUDE_OF_THE_CONTACT_FORCE.?$ |
| A. | 5 N |
| B. | 10 N |
| C. | 15 N |
| D. | 20 N |
| Answer» B. 10 N | |
| 11. |
A boy (30 kg) sitting on his horse whips it. The horse speeds up at an average acceleration of 2.0 m/s 2.If the boy does not slide back, what is the force of friction exerted by the horse on the boy ?$ |
| A. | 20 N |
| B. | 30 N |
| C. | 40 N |
| D. | 60 N |
| Answer» E. | |
| 12. |
A_heavy_box_of_mass_20_kg_is_pulled_on_a_horizontal_surface_by_applying_a_horizontal_force._If_the_coefficient_of_kinetic_friction_between_the_box_and_the_horizontal_surface_is_0.25,_find_the_force_of_friction_exerted_by_the_horizontal_surface_on_the_box.$ |
| A. | 29 N |
| B. | 39 N |
| C. | 49 N |
| D. | 59 N |
| Answer» D. 59 N | |
| 13. |
A wooden block is kept on a polished wooden plank and the inclination of the plank is gradually increased. It is found that the block starts slipping when the plank makes an angle of 18° with the horizontal. However, once started the block can continue with uniform speed if the inclination is reduced to 15°. Find the coefficient of kinetic friction between the block and the plank.$ |
| A. | tan 18<sup>0</sup> |
| B. | tan 15<sup>0</sup> |
| C. | tan 33<sup>0</sup> |
| D. | tan 3<sup>0</sup> |
| Answer» C. tan 33<sup>0</sup> | |
| 14. |
A wooden block is kept on a polished wooden plank and the inclination of the plank is gradually increased. It is found that the block starts slipping when the plank makes an angle of 18° with the horizontal. However, once started the block can continue with uniform speed if the inclination is reduced to 15°. Find the coefficient of static friction between the block and the plank.$ |
| A. | tan 18<sup>0</sup> |
| B. | tan 15<sup>0</sup> |
| C. | tan 33<sup>0</sup> |
| D. | tan 3<sup>0</sup> |
| Answer» B. tan 15<sup>0</sup> | |
| 15. |
A_boy_(30_kg)_sitting_on_his_horse_whips_it._The_horse_speeds_up_at_an_average_acceleration_of_2.0_m/s_2.If_the_boy_slides_back_during_the_acceleration,_what_can_be_said_about_the_coefficient_of_static_friction_between_the_horse_and_the_boy. |
| A. | 0.10 |
| B. | 0.20 |
| C. | 0.30 |
| D. | 0.40 |
| Answer» C. 0.30 | |
| 16. |
A body of mass 400 g slides on a rough horizontal surface. If the frictional force is 3.0 N, find the angle made by the contact force on the body with the vertical? |
| A. | 35<sup>0</sup> |
| B. | 36<sup>0</sup> |
| C. | 37<sup>0</sup> |
| D. | 38<sup>0</sup> |
| Answer» D. 38<sup>0</sup> | |
| 17. |
For moderate speeds, the force of friction |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 18. |
The ratio of magnitude of the kinetic friction to the normal reaction between the two surfaces is_____________ than that in case of limiting friction. |
| A. | greater |
| B. | less |
| C. | equal |
| D. | none of the mentioned |
| Answer» C. equal | |
| 19. |
The force of friction does not depends upon the roughness of the surfaces. |
| A. | True |
| B. | False |
| Answer» C. | |
| 20. |
The force of friction is _____________ of the area of contact, between the two surfaces. |
| A. | dependent |
| B. | independent |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» C. both of the mentioned | |
| 21. |
The magnitude of the limiting friction (F ) bears a constant ratio to the normal reaction (RN) between the two surfaces. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 22. |
The magnitude of the force of friction is ____________ to the force, which tends the body to move. |
| A. | equal |
| B. | different |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» B. different | |
| 23. |
The force of friction always acts in a direction, ___________ to that in which the body tends to move. |
| A. | same |
| B. | opposite |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» C. both of the mentioned | |