1. | A thief stole a box with valuable article of weight ‘W’ and jumped down a wall of height h. Before he reach the ground he experienced a load of (a) zero (b) W / 2 (c) W (d) 2 W |
2. | The acceleration due to gravity g and mean density of the earth r are related by which of the following relation? Where g is gravitational constant and R is radius of the earth (a) r = (b) r = (c) r = (d) r = |
3. | When the planet comes nearer the sun moves (a) fast (b) slow (c) constant at every point (d) none of the above |
4. | Kepler’s second law regarding constancy of arial velocity of a planet is a consequence of the law of conservation of (a) energy (b) angular momentum (c) linear momentum (d) none of these |
5. | The period of geostationary artificial satellite is (a) 24 hours (b) 6 hours (c) 12 hours (d) 48 hours |
6. | A geostationary satellite is orbiting the earth at a height of 6R above the surface of the earth, R being the radius of the earth. The time period of another satellite at a height of 2.5 R from the surface of earth is (a) 6 hr (b) 6 hr (c) 5 hr (d) 10 hr |
7. | The distance of Neptune and Saturn from the sun are nearly 1013 m and 1012 m respectively. Assuming that they move in circular orbits, their periodic times would be in the ratio of (a) 10 (b) 100 (c) 10 (d) 1000 |
8. | A satellite is orbiting close to the surface of the earth, then its speed is (a) (b) Rg (c) (d) |
9. | If the gravitational force between two objects were proportional to 1/R (and not as 1/R2) where R is separation between them, then a particle in circular orbit under such a force would have its orbital speed v proportional to (a) (b) R0 (c) R1 (d) |
10. | Imagine a light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between the planet and the star is proportional to then (a) T2 a R2 (b) T2 a (c) T2 a (d) T2 a R3 |
Answer
1. Ans.: (a)
2. Ans.: (c)
3.Ans.: (a)
4. Ans.: (b)
5. Ans.: (a)
6. Ans.: (a)
7. Ans.: (c)
8. Ans.: (c)
9. Ans.: (b)
10. Ans.: (b)