MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An arrow measure 1 m in length at rest. It is launched at a relativistic velocity of 80% of the velocity of light. What is the length of the arrow due to Lorentz-Fitzgerald contraction as measured by an observer, to whom the arrow is in motion? |
| A. | 0.60 m |
| B. | 1.66 m |
| C. | 0.20 m |
| D. | 5.0 m |
| Answer» B. 1.66 m | |
| 2. |
In Einstein's mass-energy equivalence relation E = mc2, 'c' stands for? |
| A. | Planck constant |
| B. | elementary charge |
| C. | atomic mass constant |
| D. | speed of light |
| Answer» E. | |
| 3. |
A metre stick move along its length with a certain speed. The apparent length of the moving metre stick as measured by a stationary observer on the ground is found to be 98 cm. Then, the velocity of the meter stick in terms of the speed of light in vacuum c will be: |
| A. | 0.17 c |
| B. | 0.19 c |
| C. | 0.98 c |
| D. | 0.14 c |
| Answer» C. 0.98 c | |
| 4. |
If the momentum of an object increases by 20%, its kinetic energy will increase by ______. |
| A. | 66% |
| B. | 77% |
| C. | 44% |
| D. | 55% |
| Answer» D. 55% | |
| 5. |
If the electric and magnetic fields (E and B respectively) are perpendicular to each other and also perpendicular to the velocity v of a charged particlethen the particles with velocity equal to _______ will pass through undeviated. |
| A. | E/B |
| B. | B/E |
| C. | √(E/B) |
| D. | √(B/E) |
| Answer» B. B/E | |
| 6. |
A body is falling freely under the action of gravity alone in vacuum. Which of the following quantities remains constant during the fall? |
| A. | Kinetic energy |
| B. | Potential energy |
| C. | Total mechanical energy |
| D. | Total linear momentum |
| Answer» D. Total linear momentum | |
| 7. |
Given below are two statements:Statement I: All moving objects, by virtue of their motion, are capable of doing work.Statement II: Potential energy is the energy of motion.In the light of the above statements, choose the correct answer from the options given below: |
| A. | Both Statement I and Statement II are true |
| B. | Both Statement I and Statement II are false |
| C. | Statement I is correct but Statement II is false |
| D. | Statement I is incorrect but Statement II is true |
| Answer» D. Statement I is incorrect but Statement II is true | |
| 8. |
If the linear momentum of a moving object gets doubled due to application of a force, then its kinetic energy will |
| A. | remain same |
| B. | to increase by four times |
| C. | to increase by two times |
| D. | to increase by eight times |
| Answer» C. to increase by two times | |
| 9. |
A cube has side L0 when at rest. If the cube moves with velocity V parallel to its one edge then its volume becomes |
| A. | \(L_0^3\) |
| B. | \(L_0^3{\left[ {1 - \left( {\frac{{{V^2}}}{{{C^2}}}} \right)} \right]^{ - \frac{1}{2}}}\) |
| C. | \(L_0^3\left[ {1 - \left( {\frac{{{V^2}}}{{{C^2}}}} \right)} \right]\) |
| D. | \(L_0^3{\left[ {1 - \left( {\frac{{{V^2}}}{{{C^2}}}} \right)} \right]^{\frac{1}{2}}}\) |
| Answer» E. | |