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May 21, 2022

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Escape velocity on earth is 11.2 km/s. What would be the escape velocity on a planet whose mass is 1000 times and radius is 10 times that of earth

(a)  112 km/s                           (b)  11.2 km/s (c)   1.12 km/s                          (d)  3.7 km/s Answer: a (6)

57. A wire of length L and radius r is rigidly fixed at one end. On stretching the other end of the wire with a force F, the increase in its length is l. If another wire of same material but of length 2L and radius 2r is stretched with a force of 2F, the increase in its length will be

(a)       l                                     ...

56. Liquids have no Poisson’s ratio, because

(a)  It has no definite shape (b)   It has greater volume (c)   It has lesser density than solid (d)   None...

The angular velocity of rotation of star (of mass M and radius R) at which the matter start to escape from its equator will be

Answer: c (3)

55. If Young’s modulus for a material is zero, then the state of material should be

(a)       Solid                                                (b)   Solid but powder (c)   Gas                         ...

54. The elastic limit for a gas

(a)  Exists (b)   Exists only at absolute zero (c)   Exists for a perfect gas (d)   Does not exist Answer-a (30)

52. If the density of the material increases, the value of Young’s modulus

(a)  Increases (b)  Decreases (c)   First increases then decreases (d)   First decreases then increases Answer-a (20)

51. The longitudinal strain is only possible in

(a)       Gases                                               (b)   Fluids (c)   Solids                             ...

49.The quality of the material which opposes the change in shape, volume or length is called

(a)   Intermolecular repulsion (b)   Intermolecular behaviour (c)   Viscosity (d)   Elasticity Answer-d (9)

Given mass of the moon is 1/81 of the mass of the earth and corresponding radius is 1/4 of the earth. If escape velocity on the earth surface is 11.2 km/s, the value of same on the surface of the moon is

(a)      0.14 km/s                         (b)  0.5 km/s (c)   2.5 km/s                            (d)  5 km/s Answer:  c (9)

47. When compared with solids and liquids, the gases have

(a)   Minimum volume elasticity (b)   Maximum volume elasticity (c)   Maximum Young’s modulus (d)   Maximum modulus of rigidity Answer-a (15)

The escape velocity of a body on the surface of the earth is 11.2 km/s. If the earth’s mass increases to twice its present value and the radius of the earth becomes half, the escape velocity would become

(a)      5.6 km/s                                    (b)  11.2 km/s (remain unchanged) (c)   22.4 km/s (d)  44.8 km/s Answer: c (6)

The escape velocity on earth is 11.2 km/s. On another planet having twice radius and 8 times mass of the earth, the escape velocity will be

(a)      3.7 km/s                          (b)  11.2 km/s (c)   22.4 km/s                          (d)  43.2 km/s Answer: c (5)

45. In suspended type moving coil galvanometer, quartz suspension is used because

(a)   It is good conductor of electricity (b)   Elastic after effects are negligible (c)   Young’s modulus is greater (d)   There...

The s – block element used as a catalyst in the manufacture of Buna – S rubber is

a.  Mg b. Ca c. Ba d. Na Ans. c (4)
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