MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The angular acceleration of a body = 3t2. What will be its speed at t=10s, if initial speed = 10rad/s? |
| A. | 1010 rad/s |
| B. | 300 rad/s |
| C. | 1310 rad/s |
| D. | 1000rad/s |
| Answer» B. 300 rad/s | |
| 2. |
A ring of diameter 1m is rotating about a central axis perpendicular to its diameter. It is rotating with a speed of 10rad/s. What force should be applied on it tangentially to stop it in exactly 3 rotations? Let the mass of the ring be 2kg. |
| A. | 10 N |
| B. | 25/3 N |
| C. | 50/3 N |
| D. | 12.5/3 N |
| Answer» C. 50/3 N | |
| 3. |
A body is under an angular deceleration of 5rad/s2. Its initial speed is 3rad/s. How much angular distance will it cover before coming to rest? |
| A. | 0.8 rad |
| B. | 0.9 rad |
| C. | 9 rad |
| D. | 2 rad |
| Answer» C. 9 rad | |
| 4. |
A circular disc is rotating about a central axis perpendicular to its diameter with a speed of 5rad/s. If a constant force of 2N is applied tangentially on it, in how much time will it come to a stop? Radius of disc = 1m & mass = 1kg. |
| A. | 0.257s |
| B. | 5s |
| C. | 1.25s |
| D. | 2.5s |
| Answer» D. 2.5s | |
| 5. |
A body is in pure rotational motion about an axis. Its angular acceleration is given by: a = 2t. What is the angular distance covered by the body from t=2s to t=3s? It starts from rest at t=0. |
| A. | 19/3 rad |
| B. | 0 rad |
| C. | 2/3 rad |
| D. | 5/3 rad |
| Answer» B. 0 rad | |
| 6. |
A body has a moment of inertia = 5kgm2 about an axis. What should be the torque for increasing its angular speed from 0 to 10rad/s in 4s? Assume that the body rotates purely about that axis. |
| A. | 25Nm |
| B. | 2.5Nm |
| C. | 12.5Nm |
| D. | 1.25Nm |
| Answer» D. 1.25Nm | |
| 7. |
The angular speed of a body is 2rpm. What should be the angular acceleration for the angular speed to double up in 5s? |
| A. | -2 /75 rad/s<sup>2</sup> |
| B. | - /75 rad/s<sup>2</sup> |
| C. | /75 rad/s<sup>2</sup> |
| D. | 2 /75 rad/s<sup>2</sup> |
| Answer» D. 2 /75 rad/s<sup>2</sup> | |
| 8. |
The rate of change of angular speed is constant. What will be the expression for change in angular speed after time dt, if angular acceleration is a ? The initial angular speed is w . |
| A. | a*dt |
| B. | w a*dt |
| C. | w + a*dt |
| D. | There is no change |
| Answer» B. w a*dt | |