Home
News
Colleges
Courses
Admission
Lectures
Online Test
Past Papers
Date Sheets
Results
Study Abroad
Jobs
Tutors
More
Apps
Physics Fsc Part 1 Chapter 11 Online Test
| Sr. # | Questions | Answers Choice |
|---|---|---|
| 1 | A photon is particle of light. What is its mass when it moves with 0.9 C? |
<p>9.1 x 10<sup>-31</sup> kg</p> <p>1.67 x 10<sup>-19</sup> kg</p> <p>1.67 x 10<sup>-27</sup> kg</p> <p>Zeri</p> |
| 2 | it the rest mass of a particle mo increased to m due to its high speed then its kinetic energy is. |
<p>( m - mo ) c<sup>2</sup></p> <p>1/2 mv2</p> <p>1/2 mc<sup>2</sup></p> <p>1/2 (m -m<sub>o</sub>0</p> |
| 3 | If a space craft of rest legnth 'lo' is movng with a speed equal to speed of light, then its relativstic legnth l , will be |
<p>l = l<sub>o</sub></p> <p>l = l<sub>o</sub>/2</p> <p>l = 0</p> <p>All of these</p> |
| 4 | The length of rod at rest as measurd by an observer moving parallel to it with relativistic speed is given by |
<p>l = l<sub>o</sub> [1 - V2/C2]</p> <p>l = l<sub>0</sub> 1 -V2/C2</p> <p>l = l<sub>o</sub> / 1- V<sup>2</sup>C<sup>2</sup></p> <p>l0 = l 1- V<sup>2</sup>/C<sup>2</sup></p> |
| 5 | The mass of an object will be doubled at the speed. |
<p>2.6 x 10 <sup>7</sup> m/s</p> <p>1.6 x 10<sup>8</sup> m/s</p> <p>2.6 x 10<sup>8</sup> m/s</p> <p>None of these</p> |
| 6 | The energy 'E' eqivalent to mass given by |
<p>Ec2</p> <p>E/C2</p> <p>E/C</p> <p>C2/E</p> |
| 7 | If a material object moves with the speed of light 'c' its mass becomes |
<p>Equal to its rest mass</p> <p>Infinite</p> <p>Four times of its rst mass</p> <p>Double of its rest mass</p> |
| 8 | The theory of relativity was proposed in |
<p>1920</p> <p>1905</p> <p>1915</p> <p>1895</p> |
| 9 | A no intertial frame of reference. |
<p>Moves with some acceleration </p> <p>Is always rest on earth</p> <p>Moves with uniform velocity</p> <p>All of the above</p> |
| 10 | A rod at rest appears to an observer just a mere point when he moves across it as speed. |
<p>Equal to the speed of light</p> <p>Double the speed of light</p> <p>Three-fourth the speed of light</p> <p>None of the above</p> |
| 11 | Relativistic velocity is of the order of. |
<p>1/15 of the velocity of light</p> <p>1/20 of the velocity of light</p> <p>1/10 of the velocity of light</p> <p>1/25 of the velocity of light</p> |
| 12 | Which one of the following physical quantities is indpednent of relativistic speed. |
<p>Charge</p> <p>Length</p> <p>Mass</p> <p>Time</p> |
| 13 | The speed of beam light of a car while moving with high speed as compared to its rest positionis |
<p>Greater</p> <p>Less</p> <p>Same</p> <p>Zero</p> |
| 14 | If an observeris moving in the same direction as a sound wave, the velocity of the wave seems to be |
<p>Less</p> <p>More</p> <p>Constant</p> <p>Sum of the two velocities</p> |
| 15 | Relativistic mechanics yields results different from classical mechanics for objects moving with. |
<p>Low velocity</p> <p>Velocity equal to that of sound waves</p> <p>Veloitiy geater than sound waves</p> <p>Velocity approaching that of lignt</p> |
