1. With the increase in temperature, the density of a substance, in general,
(a) Increases
(b) Decreases
(c) First increase then decreases
(d) First decrease then increases
2. The normal temperature of the human body is
(a) 370C
(b) 380C
(c) 36.80C
(d) None of these
3. Two spheres of the same size are made of the same metal, but one is hollow and the other is solid. They are heated to the same temperature. Then,
(a) The hollow sphere will expand more
(b) The solid sphere will expand more
(c) Both spheres will expand almost equally
(d) Only the solid sphere will expand
4. Water evaporates under atmospheric pressure. Without changing the temperature, the same water is placed under partial vacuum. The rate of evaporation will
(a) Increase
(b) Drop to zero
(c) Decrease
(d) Remain unaffected
5. A mercury thermometer, with a concave reflector fire. Which of the following combinations will cause the smallest reading on the thermometer?
(a) Black reflector, black bulb
(b) Black reflector, shiny bulb
(c) Shiny reflector, shiny bulb
(d) Temperature will remain same for any combinations.
6. A block of wood is floating on water at 00C with a certain volume V above water level. The temperature of water is slowly raised from 00C. How will the volume V change with the rise of temperature?
(a) V will be unchanged
(b) V will decrease from 00C
(c) V will decrease till 40C and then increase
(d) V will increase till 40C and then decrease
7. Coefficient of linear expansion always ------- with the increase in temperature.
(a) Increases
(b) Decreases
(c) Remains the same
(d) Doubles itself
8. A thermometer is used to measure
(a) Heat
(b) Thermal capacity
(c) water equivalent
(d) temperature
9. A circular disc of copper has a symmetrical hole at its centre. The disc is uniformly heated. The diameter of the hole will
(a) Increase
(b) Decrease
(c) Remain the same
(d) Become indeterminate
10. When water is heated from 00C, its volume
(a) Increases
(b) Decreases till 40C
(c) Remains the same
(d) First increases then decreases
11. The most commonly used thermometric substance is
(a) Water
(b) Alcohol
(c) Mercury
(d) None of these
12. In summer, the clocks
(a) Become slow
(b) become fast
(c) gives correct time
(d) lose time
13. Therm is the unit of
(a) Heat
(b) Temperature
(c) Thermometry
(d) Work
14. Absolute zero corresponds to
(a) – 273 K
(b) 2730C
(c) 2730R
(d) None of these
15. The temperature of water at the bottom of a large waterfall is higher than that of the water at the top, because
(a) The falling water absorbs heat from the sun
(b) The KE of the falling water is converted into heat
(c) The water at the bottom has greater PE
(d) Rocks on the bed of the river give out heat
16. When salt is property mixed with ice, the melting point of ice.
(a) Is lovered
(b) Remains the same
(c) Is raised
(b) Becomes infinite
17. Steam at 1000C cause more severe burns than water at the same temperature because
(a) Steam is a gas
(b) Steam cannot do work
(c) Steam can provide more heat
(d) Steam is highly combustible
18. When an inflated type bursts, the air escaping out
(a) Will get heated up
(b) Will be cooled
(c) Will not undergo any change in its temperature
(d) Will be liquefied
19. A thermos bottle containing coffee is vigorously shaken. If the coffee is considered as a system, then the temperature of the coffee will
(a) Increase slightly
(b) Fall
(c) Remain the same
(d) Never be determined
20. A container having some gas was kept in a moving train. The temperature of the gas in the container will
(a) Increase slightly
(b) Remain the same
(c) Decrease
(d) Become infinite
21. Two glass tumblers have been stuck together (one into the other). They can be separated by
(a) Placing hot water in the inner tumbler
(b) Placing the tumblers in cold water
(c) Placing the outer tumbler in hot water
(d) Hammering them vigorously
22. Glaciers always melt at the ---------first.
(a) Top surface
(b) Sides
(c) Bottom
(d) Middle surface
23. Heat flows as a result of difference of
(a) Temperature
(b) Weight
(c) Mass
(d) None of these
24. The unit of specific heat is
(a) Cal0C
(b) Cal/g
(c) Cal/g
(d) None of these
25. The unit of latent heat is
(a) Cal-g
(b) Cal/0C
(c) Cal/g
(d) None of these
26. Calorimeters are generally made of
(a) Copper
(b) Brass
(c) Aluminum
(d) Zinc
27. One joule is approximately equal to
(a) 0.28 cal
(b) 0.32 cal
(c) 0.24 cal
(d) 4.2 cal
28. When air is saturated, it cannot hold
(a) More water vapour
(b) More air
(c) More carbon dioxide
(d) More oxygen
29. If RH is high
(a) We feel sultry
(b) We perspire less
(c) Clothes do not dry easily
(d) All the above are correct
30. At dew point, RH is
(a) 10%
(b) 20%
(c) 50%
(d) 100%
31. The most comfortable value for RH is
(a) 10%
(b) 30%
(c) 50%
(d) 90%
32. The first thermometer was developed by
(a) Joule
(b) Fahrenheit
(c) Galileo
(d) Watt
33. Burning of a meteorite in the earth's atmosphere is an example of change of
(a) Heat energy into kinetic energy
(b) Kinetic energy into heat energy
(c) Kinetic energy into potential energy
(d) Potential energy into heat energy
34. Soda bottles are made of thick glass so that they can withstand the
(a) Pressure in summer
(b) Temperature in summer
(c) Decrease in viscosity
(d) Increase in potential energy
35. The relative humidity is 50%, if air contains about
(a) 2.55 g of water vapour at 400C
(b) 25.5 g of water vapour at 400C
(c) 2.55 kg of water vapour at 400C
(d) 25.5 kg of water vapour at 400C
36. Evaporation is the process of changing liquid into vapour
(a) At any temperature
(b) Above its boiling point
(c) At its boiling point
(d) Below its boiling point
37. When we cool a gas below its condensation point, the KE of its molecules
(a) Increases
(b) Decreases
(c) Remains the same
(d) First increases then decreases
38. A piece of ice of 00C is added to a vessel containing water at 00C, then
(a) All of the ice will melt
(b) Some ice will melt
(c) No ice will melt
(d) The temperature will decrease further
39. At high temperature, the molecules of a substance
(a) Move more vigorously
(b) Move less vigorously
(c) Become stationary
(d) Are attracted strongly
40. Fahrenheit scale divides two fixed points into
(a) 180 parts
(b) 212 parts
(c) 100 parts
(d) 32 parts
41. Celsius scale divides two fixed points into
(a) 180 parts
(b) 212 parts
(c) 100 parts
(d) 32 parts
42. In hot water bottles, water is used because
(a) Its specific heat is low
(b) Its specific heat is high
(c) It is cheap
(d) It is easily available
43. Two rods, one of iron and the other of aluminum, are heated to the same temperature. Then,
(a) The iron rod will expand less
(b) The iron rod will expand more
(c) Both rods will expand equally
(d) The iron rod will not expand at all
44. When steam condenses into water its
(a) Temperature remains the same
(b) Heat dissipates
(c) Temperature increases
(d) Temperature decreases
45. What metallic wire is fused in glass?
(a) Copper
(b) Platinum
(c) Tungsten
(d) Silver
46. When cold water is dropped on a hot chimney it breaks, because
(a) Water changes into vapour
(b) The chimney contracts
(c) The chimney expands
(d) Any unknown reason
47. Water is used to cool the radiators of engines in motor cars because of its
(a) Low density
(b) Easy availability
(c) High specific heat
(d) Low temperature
48. Two bodies are in thermal equilibrium if they have same
(a) Temperature
(b) Amount of heat
(c) Specific heat
(d) Thermal capacity
49. The saturated vapour pressure of water at 1000C is
(a) 750 mm of Hg
(b) 760 mm of Hg
(c) 76 mm of Hg
(d) 7.6 mm of Hg
50. A breaker of water is placed on a table. it can be made to boil quickly by passing
(a) Steam through it at atmospheric pressure
(b) Steam through it at a pressure lower than atmospheric
(c) Steam through it at a pressure higher than atmospheric
(d) Hot water
51. Rice takes longest to cook
(a) At sea level
(b) At Simla
(c) At Mt. Everest (if tried)
(d) In a submarine 100 m below the sureface of sea
52. We feel comfortable in a fan because
(a) It gives us cool air
(b) It evaporates water from our body
(c) Our body radiates more heat due to air of fan
(d) None of these
53. On increasing the external pressure, the melting point of wax
(a) Decreases
(b) Increases
(c) Remains unaffected
(d) None of these
54. Skating of ice is possible because of the phenomenon of
(a) Friction
(b) Sublimation
(c) Regelation
(d) Latent heat of fusion
55. On increasing the external pressure, the boiling point of a liquid
(a) Is raised
(b) Is lower
(c) Remains unaffected
(d) None of these
56. Water evaporates under the atmosphere pressure. If now the same water is placed under vacuum then the rate of evaporation will
(a) Increase
(b) Decrease
(c) Remain unchanged
(d) Nothing can be decided
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