31. If the distance between two objects exceeds the normal distance by 6 times, the force of gravity will be-
32. Who among the following anticipated Newton by declaring that all things gravitate to the Earth?
33. F = GM m/d2 what is G called in the formula?
34. Suppose the gravitational force changes inversely from the n power of the distance, then the time period of the planet revolving around the Sun in a circular orbit of R radius, will be proportional-
35. Which of the following pairs is correctly matched?
List-I
List-II
a. Radium
1. Alexander Fleming
b. Penicillin
2. Madam Curie
c. X-ray
3. Edward Jenner
d. Smallpox
4. W.K. Roentgen
| List-I | List-II |
| a. Radium | 1. Alexander Fleming |
| b. Penicillin | 2. Madam Curie |
| c. X-ray | 3. Edward Jenner |
| d. Smallpox | 4. W.K. Roentgen |
36. A girl is swinging on a swing in sitting position. When the girl stands up, the period of the swing will
37. If pieces of equal size of woods, wax and iron falling from a same height, which one will reach the surface of the Earth first?
38. Who gave the theory of gravity?
39. Where is the center of gravity of an object hanging freely?
40. The Law of Gravitation was given by . . . . . . . .
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