MCQOPTIONS
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MCQOPTIONS
This section includes 72 Mcqs, each offering curated multiple-choice questions to sharpen your UPSEE knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
PSLV means |
| A. | Polar Satellite Launch Vehicle |
| B. | Polar Satellite Long Vehicle |
| C. | Position Satellite Land Vehicle |
| D. | Polar Satellite Land Vehicle |
| Answer» B. Polar Satellite Long Vehicle | |
| 52. |
A body of mass 'm' is raised through a height 'h' above surface of the Earth so that the increase in its PE is mgR/5, where R is the radius of Earth, then h = |
| A. | R |
| B. | R/4 |
| C. | R/5 |
| D. | R/8 |
| Answer» C. R/5 | |
| 53. |
If the radius of the earth decreases by 1% and its mass remains same, then the acceleration due to gravity. |
| A. | increase by 1% |
| B. | decrease by 1% |
| C. | increase by 2% |
| D. | decrease by 2% |
| Answer» D. decrease by 2% | |
| 54. |
A satellite is revolving in a circular orbit at a height h from the earth surface such that h ≪ R, where R is the radius of the earth. Assuming that the effect of earth’s atmosphere can be neglected the minimum increase in the speed required so that the satellite could escape from the gravitational field of earth is |
| A. | \(\sqrt {\frac{{gR}}{2}} \) |
| B. | \(\sqrt {gR} \) |
| C. | \(\sqrt {2gR} {\rm{\;}}\) |
| D. | \(\sqrt {gR} \left( {\sqrt 2 - 1} \right)\) |
| Answer» E. | |
| 55. |
If the distance between sun and earth were reduced to half its present value, then the number of days in one year would have been |
| A. | 65 |
| B. | 129 |
| C. | 258 |
| D. | 730 |
| Answer» C. 258 | |
| 56. |
If two satellites of masses m1 and m2 are revolving around a earth in a circular orbits of radius r1 and r2, then the ratio of their orbital velocities \(\dfrac{v_1}{v_2}\) is |
| A. | \(\sqrt{\dfrac{r_2}{r_1}}\) |
| B. | \(\sqrt{\dfrac{r_1}{r_2}}\) |
| C. | \(\dfrac{r_1}{r_2}\) |
| D. | \(\dfrac{r_2}{r_1}\) |
| Answer» B. \(\sqrt{\dfrac{r_1}{r_2}}\) | |
| 57. |
A body freely falling from rest has acquired a velocity ‘v’ after it falls through a distance ‘h’. The distance it has to fall down further for its velocity to become double is: |
| A. | 2h |
| B. | 4h |
| C. | 3h |
| D. | h |
| Answer» D. h | |
| 58. |
Four identical particles of mass M are located at the corners of a square of side ‘a’. What should be their speed if each of them revolves under the influence of others' gravitational field in a circular orbit circumscribing the square? |
| A. | \({\rm{}}1.35\sqrt {\frac{{{\rm{GM}}}}{{\rm{a}}}}\) |
| B. | \(1.16\sqrt {\frac{{{\rm{GM}}}}{{\rm{a}}}}\) |
| C. | \(1.21\sqrt {\frac{{{\rm{GM}}}}{{\rm{a}}}}\) |
| D. | \(1.41\sqrt {\frac{{{\rm{GM}}}}{{\rm{a}}}}\) |
| Answer» C. \(1.21\sqrt {\frac{{{\rm{GM}}}}{{\rm{a}}}}\) | |
| 59. |
A rice bag is weighed at a place near the equator and the same is taken to Antarctica. The weight of the bag will be_______. |
| A. | more at Antarctica |
| B. | same at both the places |
| C. | less at Antarctica |
| D. | zero at Antarctica |
| Answer» B. same at both the places | |
| 60. |
A satellite orbits the earth in a circle of radius 8000 km. At that distance from the earth, the velocity of the satellite is (g = 6.2 m/s2) |
| A. | 0.90 km/s |
| B. | 7.0 km/s |
| C. | 5.6 km/s |
| D. | 0.7 km/s |
| Answer» D. 0.7 km/s | |
| 61. |
At what height above the surface of the earth does the weight of an object reduce by 1%. Given the radius of the earth is 6400. |
| A. | 3.2 km |
| B. | 64 km |
| C. | 6.4 km |
| D. | 32 km |
| Answer» E. | |
| 62. |
In a planet that hosts an atmosphere, the number (n) of gas atoms and molecules per unit volume decreases exponentially (n = n0exp(-z/H) with altitude (z). The characteristic constant (H) of the exponential is known as |
| A. | Scale height |
| B. | Lapse rate |
| C. | Sheer coefficient |
| D. | Tapering rate |
| Answer» B. Lapse rate | |
| 63. |
Do you know the acceleration of the moon depends upon: |
| A. | Gravitational force exerted on the moon by the Sun |
| B. | Gravitational force exerted on the moon by the Planets |
| C. | Gravitational force exerted on the moon by the Earth |
| D. | Gravitational force exerted on the Earth by the Moon. |
| Answer» D. Gravitational force exerted on the Earth by the Moon. | |
| 64. |
Who said that in the universe every body exerts a gravitational force on every other body? |
| A. | Einstein |
| B. | Irene Curie |
| C. | Sir Isaac Newton |
| D. | Galileo Galilei |
| Answer» D. Galileo Galilei | |
| 65. |
Acceleration due to gravity decreases with: |
| A. | Height |
| B. | Weight |
| C. | Amplitude |
| D. | Altitude |
| Answer» E. | |
| 66. |
What is the unit of the magnitude of the weight? |
| A. | Distance (meter) |
| B. | Mass (grams) |
| C. | Force (Newton) |
| D. | None of the above |
| Answer» D. None of the above | |
| 67. |
Name the world’s first artificial Satellite? |
| A. | Sputnik 1 |
| B. | INSAT-1B |
| C. | Explorer 1 |
| D. | Aryabhata |
| Answer» B. INSAT-1B | |
| 68. |
When body falls towards earth its motion is due to: |
| A. | Gravitational force |
| B. | Motion due to gravity |
| C. | Acceleration due to gravity |
| D. | Because of zero weight |
| Answer» B. Motion due to gravity | |
| 69. |
The value of universal gravitational constant G is: |
| A. | 9.8 m/s2 |
| B. | 6.673×10-11 N m2 kg-2 |
| C. | 6.371 x 106 m |
| D. | 1.738 x 10 6 m |
| Answer» C. 6.371 x 106 m | |
| 70. |
When satellite orbits close to a planet, its time period depends upon: |
| A. | The mass of satellite |
| B. | Radius of the planet |
| C. | Mass of the planet |
| D. | Density of the planet |
| Answer» E. | |
| 71. |
If the mass of the earth is not changed and its radius decreased by 1% then the acceleration due to gravity on the surface of the earth would be: |
| A. | Increase by 2 % |
| B. | Decrease by 2 % |
| C. | Increase by 9.8 % |
| D. | Remains unchanged |
| Answer» B. Decrease by 2 % | |
| 72. |
The period of artificial geostationary satellite is: |
| A. | 8 hours |
| B. | 12 hours |
| C. | 24 hours |
| D. | 46 hours |
| Answer» D. 46 hours | |