51. If the door of a refrigerator is kept open, than which of the following is true?
52. The normal temperature of human body on the Kelvin scale is
53. °F = . . . . . . . . . °C
54. Assertion (A): Black hole is such a celestial existence which cannot be seen by telescope.
Reason (R): The gravitational field of black hole is much strong that even light does not escape from it.
Reason (R): The gravitational field of black hole is much strong that even light does not escape from it.
55. Refers to absolute zero temperature-
56. Assertion (A): Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluorocarbons.
Reason (R): Ammonia can be liquefied at ambient temperatures at low pressures.
Reason (R): Ammonia can be liquefied at ambient temperatures at low pressures.
57. When hot liquid is poured into a thick glass tumbler, it cracks because glass
58. Maximum temperature inside pressure cooker depends on
59. Why is it difficult to measure the coefficient of expansion of a liquid than solid?
60. When ice melts, then
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