MCQOPTIONS
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MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A spacecraft of mass 2000 kg moving with a velocity of 600 m/s suddenly explodes into two pieces. One piece of mass 500 kg is left stationary. The velocity of the other part must be (in m/s) |
| A. | 1000 |
| B. | 600 |
| C. | 800 |
| D. | 1500 |
| Answer» D. 1500 | |
| 2. |
A boxer moves his head backwards when the opponent gives a punch to his head, so as to: |
| A. | increase the impulse |
| B. | increase the contact time which decreases the force |
| C. | decrease the contact time which increases the force |
| D. | increase the momentum and decrease the force |
| Answer» C. decrease the contact time which increases the force | |
| 3. |
A mass of 4 kg moving at 3 m/s collides with a mass of 6 kg moving at 2 m/s in the opposite direction and they stick together. The combined mass has velocity of: |
| A. | 5.6 m/s |
| B. | 2.4 m/s |
| C. | 4.8 m/s |
| D. | Zero |
| Answer» E. | |
| 4. |
A metal ball with the momentum mv strikes a wall and bounces back. The change in the ball's momentum is ideally |
| A. | 0 |
| B. | mv |
| C. | 2mv |
| D. | - 2mv |
| Answer» E. | |
| 5. |
A ball of mass 150 g moving with an acceleration 20 m/s2 is hit by a force which acts on it for 0·1 s. The impulse is |
| A. | 1·2 N s |
| B. | 0·3 N s |
| C. | 0·1 N s |
| D. | 0·5 N s |
| Answer» C. 0·1 N s | |
| 6. |
If the kinetic energy and momentum of an object of mass m are k and p respectively, then the relation between kinetic energy and momentum will be |
| A. | p = 2 km |
| B. | p = 2 k2 m |
| C. | \(p=\sqrt{2 \ km}\) |
| D. | \(p=\sqrt{\dfrac{2k}{m}}\) |
| Answer» D. \(p=\sqrt{\dfrac{2k}{m}}\) | |
| 7. |
A force F acts on a particle for a short time t. The product (F × t) will be equal to the change of |
| A. | kinetic energy |
| B. | impact energy |
| C. | momentum |
| D. | none of the above |
| Answer» D. none of the above | |
| 8. |
In a perfect elastic collision, the value of the coefficient of restitution is |
| A. | 1 |
| B. | 0.667 |
| C. | 0.5 |
| D. | 0.33 |
| Answer» B. 0.667 | |
| 9. |
A particle of mass ‘m’ is moving with speed ‘2v’ and collides with a mass ‘2m’ moving with speed ‘v’ in the same direction. After collision, the first mass is stopped completely while the second one splits into two particles each of mass ‘m’, which move at angle 45° with respect to the original direction.The speed of each of the moving particle will be: |
| A. | \(\sqrt 2 v\) |
| B. | \(2\sqrt 2 v\) |
| C. | \(\frac{v}{{2\sqrt 2 }}\) |
| D. | \(\frac{v}{{\sqrt 2 {\rm{}}}}\) |
| Answer» C. \(\frac{v}{{2\sqrt 2 }}\) | |
| 10. |
A rocket moves because of the conservation of |
| A. | Momentum |
| B. | Energy |
| C. | Mass |
| D. | Spin angular momentum |
| Answer» B. Energy | |
| 11. |
A bullet of mass 20 gm is fired from a rifle of mass 8 kg with a velocity of 100 m/s. The velocity of recoil of the rifle is: |
| A. | 250 m/s |
| B. | 2.5 m/s |
| C. | 25 m/s |
| D. | 0.25 m/s |
| Answer» E. | |
| 12. |
A particle of mass m1 moving with u1 velocity collide with another particle of mass m2 which is initially in rest. If collision is perfectly inelastic then the fractional loss in the kinetic energy is |
| A. | \(\dfrac{1}{4}m_1 u_1^2\) |
| B. | \(\dfrac{m_2}{m_1}\) |
| C. | \(\dfrac{m_2}{m_1+m_2}\) |
| D. | \(\dfrac{m_1}{m_1+m_2}\) |
| Answer» D. \(\dfrac{m_1}{m_1+m_2}\) | |
| 13. |
In an orbital motion, the angular momentum vector is: |
| A. | Along the radius vector |
| B. | Parallel to the linear momentum |
| C. | In the orbital plane |
| D. | Perpendicular to the orbital plane |
| Answer» E. | |
| 14. |
kgms-1 is the SI unit of ______ |
| A. | Momentum |
| B. | Pressure |
| C. | Force |
| D. | Velocity |
| Answer» B. Pressure | |
| 15. |
A rocket whose initial mass is 850 kg consumes fuel at the rate of 2.3 kgs-1, The speed of the exhaust gases relative to the rocket engine is 2000 ms-1. What thrust does the rocket engine provide? |
| A. | 5.47 x 106 N |
| B. | 4600 N |
| C. | 1217 N |
| D. | 6440 N |
| Answer» C. 1217 N | |
| 16. |
A body of mass 2 kg makes an elastic collision with a second body at rest and continues to move in the original direction but with one fourth of its original speed. What is the mass of the second body? |
| A. | 1.0 kg |
| B. | 1.5 kg |
| C. | 1.8 kg |
| D. | 1.2 kg |
| Answer» E. | |
| 17. |
If a body of mass M has momentum P, then Kinetic Energy will be _______? |
| A. | P2 / m |
| B. | P2 / 2m |
| C. | m2 / 2P |
| D. | P / 2m |
| Answer» C. m2 / 2P | |
| 18. |
A 4kg ball travelling with a speed of 5m/s strikes wall normally and rebounds with the same speed. If the ball is in contact with the wall for 0.05s, average force exerted on the wall is |
| A. | 400N |
| B. | 600N |
| C. | 800N |
| D. | 1000N |
| Answer» D. 1000N | |
| 19. |
A sphere of mass 2kg strikes another sphere of mass 3 kg at rest with a velocity of 5 m/s. if they move together after collision. What is their common velocity? |
| A. | 5 m/s |
| B. | 6 m/s |
| C. | 1 m/s |
| D. | 2 m/s |
| Answer» E. | |