McqMate
Chapters
| 1. |
Force acting on two point masses is directly proportional to |
| A. | sum of masses |
| B. | difference of masses |
| C. | distance between masses |
| D. | product of masses |
| Answer» D. product of masses | |
| 2. |
Mass of Earth when it's radius is 6400 km and gravitational field strength is 9.81 N kg -1 is {{}} |
| A. | 6.0 × 1024 kg |
| B. | 5 × 1023 kg |
| C. | 40 × 109 kg |
| D. | 9 × 10 24 kg |
| Answer» A. 6.0 × 1024 kg | |
| 3. |
On scale of building, gravitational field is |
| A. | increasing |
| B. | decreasing |
| C. | uniform |
| D. | varying |
| Answer» C. uniform | |
| 4. |
Decrease in field strength on top of Mount Everest is |
| A. | 10% |
| B. | 5% |
| C. | 1% |
| D. | 0.3% |
| Answer» D. 0.3% | |
| 5. |
Work done on an object to bring it to certain point in space is called |
| A. | gravitational potential energy |
| B. | potential energy |
| C. | kinetic energy |
| D. | mechanical energy |
| Answer» A. gravitational potential energy | |
| 6. |
N kg-1is equivalent to{{}} |
| A. | m s-2 |
| B. | m s-1 |
| C. | m s |
| D. | m s-3 |
| Answer» A. m s-2 | |
| 7. |
Mass of satellite orbiting Earth is |
| A. | considered |
| B. | irrelevant |
| C. | should be infinite |
| D. | should be zero |
| Answer» B. irrelevant | |
| 8. |
Spacing between field lines indicates |
| A. | direction of field lines |
| B. | strength of field lines |
| C. | magnitude of field lines |
| D. | work done by field lines |
| Answer» B. strength of field lines | |
| 9. |
Square of orbital period is proportional to |
| A. | radius |
| B. | square of radius |
| C. | cube of radius |
| D. | square of diameter |
| Answer» C. cube of radius | |
| 10. |
Number of satellites in geostationary orbits are |
| A. | 100 |
| B. | 200 |
| C. | 300 |
| D. | 400 |
| Answer» C. 300 | |
| 11. |
Geostationary satellites have lifetime of nearly |
| A. | 20 years |
| B. | 10 years |
| C. | 50 years |
| D. | 60 years |
| Answer» B. 10 years | |
| 12. |
Time taken to complete a revolution around a planet is called |
| A. | orbital period |
| B. | time period |
| C. | frequency |
| D. | wavelength |
| Answer» A. orbital period | |
| 13. |
As distance increases, value of gravitational field strength |
| A. | also increases |
| B. | decreases |
| C. | remains constant |
| D. | may increase or decrease |
| Answer» B. decreases | |
| 14. |
All objects are attracted towards |
| A. | center of Earth |
| B. | sun |
| C. | mars |
| D. | moon |
| Answer» A. center of Earth | |
| 15. |
Satellite around Earth follows a circular path because |
| A. | gravitational force is parallel to velocity |
| B. | gravitational force is anti parallel to velocity |
| C. | gravitational force is perpendicular to velocity |
| D. | gravitational force is anti perpendicular to |
| Answer» C. gravitational force is perpendicular to velocity | |
| 16. |
Each 1 kg mass experiences force of |
| A. | 7 N |
| B. | 9.81 N |
| C. | 20 N |
| D. | 100 N |
| Answer» B. 9.81 N | |
| 17. |
Gravitational potential is always |
| A. | infinite |
| B. | zero |
| C. | positive |
| D. | negative |
| Answer» D. negative | |
| 18. |
The closer satellite is to Earth, its speed should be |
| A. | more fast |
| B. | more slow |
| C. | zero |
| D. | any constant value |
| Answer» A. more fast | |
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