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Heat

179 MCQ questions with answers and explanations · page 2 of 8

Test yourself▶ 25 question test▶ 50 question test

Q26. How much temperature can be measured by radiation pyrometer?

  1. A100-250°C
  2. BUp to 100°C
  3. C250-500°C
  4. DAbove 800°C
Show answer & explanation

Answer: D) Above 800°C

Q27. Thermocouple is made by……….

  1. Atwo nonmetals
  2. Btwo similar metals
  3. Ctwo dissimilar metals
  4. Dnone of these
Show answer & explanation

Answer: C) two dissimilar metals

Q28. The temperature of the sun is measured

  1. Aby platinum thermometer
  2. Bby gas thermometer
  3. Cby pyrometer thermometer
  4. Dby vapor pressure thermometer
Show answer & explanation

Answer: C) by pyrometer thermometer

Q29. Which of the following thermometers is called pyrometer?

  1. Athermoelectric thermometer
  2. Bradiation thermometer
  3. Cgas thermometer
  4. Dliquid thermometer
Show answer & explanation

Answer: B) radiation thermometer

Q30. Which of the following is correct?

  1. A(F+32)/9=C/5
  2. B(F-32)/9=C/5
  3. C(C-5)/9=F/32
  4. D(F-5)/9=C/32
Show answer & explanation

Answer: B) (F-32)/9=C/5

Q31. The boiling point (BP) and freezing point (FP) of water on the Celsius scale are, respectively-

  1. A0°C and 100°C
  2. B100°C and 0°C
  3. C212°C and 32°C
  4. D32°C and 212°C
Show answer & explanation

Answer: B) 100°C and 0°C

Q32. On the Celsius scale of temperature, absolute zero is the temperature of-

  1. A0°C
  2. B32°C
  3. C100°C
  4. D40°C
Show answer & explanation

Answer: D) 40°C

Q33. The normal temperature of the human body in Kelvin is-

  1. A280
  2. B290
  3. C300
  4. D- 273°C
Show answer & explanation

Answer: D) - 273°C

Q34. At what temperature will two thermometers, one in Fahrenheit and the other in Celsius, have numerically identical readings?

  1. A- 40°
  2. B0°
  3. C-273
  4. D100°
Show answer & explanation

Answer: A) - 40°

Q35. The lowest possible temperature is

  1. AB35°C
  2. B0°C
  3. C- 300°C
  4. D1°C
Show answer & explanation

Answer: A) B35°C

Q36. The temperature of an object on the Fahrenheit scale is 212°F. Its temperature on the Celsius scale would be

  1. A- 32°C
  2. B40°C
  3. C100°C
  4. D112°C
Show answer & explanation

Answer: C) 100°C

Q37. 0°C on the Celsius scale is equal to how many degrees on the Fahrenheit scale?

  1. A50°
  2. B32°
  3. C64°
  4. D273°
Show answer & explanation

Answer: B) 32°

Q38. The normal human body temperature is 98.4°F. Its equivalent temperature in °C is

  1. A40.16
  2. B36.891
  3. C35.72
  4. D32.36
Show answer & explanation

Answer: B) 36.891

Q39. The temperature of boiling water at normal atmospheric pressure on the Fahrenheit scale is The temperature of boiling water at normal atmospheric pressure on the Fahrenheit scale is?

  1. A32°F
  2. B100°E
  3. C180°F
  4. D212°F
Show answer & explanation

Answer: D) 212°F

Q40. If the boiling point of water in Delhi is 100°C, what will be the temperature of water in Mussoorie?

  1. A100°C
  2. Bless than 100°C
  3. CMore than 100°C
  4. DAll is false
Show answer & explanation

Answer: B) less than 100°C

Q41. If the temperature of a human being is 60°C, what will be his temperature in Fahrenheit?

  1. A140°F
  2. B120°F
  3. C130°F
  4. D98°F
Show answer & explanation

Answer: A) 140°F

Q42. The normal body temperature of a human being is-

  1. A98°F
  2. B98°C
  3. C68°F
  4. D66°F
Show answer & explanation

Answer: A) 98°F

Q43. Water is used in hot water bags because-

  1. AIt is easily available.
  2. BIt is cheap and not harmful.
  3. CIts specific heat is high
  4. DIt is easy to heat water
Show answer & explanation

Answer: C) Its specific heat is high

Q44. Why do metal teapots have wooden handles?

  1. Awood is a poor conductor of heat
  2. BIt does not consume electricity
  3. CThis makes the character look beautiful
  4. DIt is clean/
Show answer & explanation

Answer: A) wood is a poor conductor of heat

Q45. When hot water is poured over a thick glass tumbler, it shatters. What is the reason for this?

  1. ASuddenly the glass expands.
  2. BSuddenly the glass shrinks.
  3. CThe water evaporates.
  4. DGlass is chemically repelled by water.
Show answer & explanation

Answer: A) Suddenly the glass expands.

Q46. At what temperature is the density of water maximum?

  1. Aat 0°C
  2. Bat 4°C
  3. Cat -4°C
  4. Dat 100°C
Show answer & explanation

Answer: B) at 4°C

Q47. When ice is heated from 0°C to 10°C, the volume of water-

  1. Agrows uniformly
  2. Bdecreases uniformly
  3. Cfirst increases and then decreases
  4. Dfirst decreases and then increases
Show answer & explanation

Answer: D) first decreases and then increases

Q48. If water is cooled from 10°C to 0°C then-

  1. AThe volume of water will decrease up to 4°C and then increase.
  2. BThe density of water will continue to increase and reach a maximum at 4°C
  3. CThe volume of water will continuously decrease and will reach its minimum at 4°C
  4. DThe density of water will decrease up to 4°C and then increase.
Show answer & explanation

Answer: A) The volume of water will decrease up to 4°C and then increase.

Q49. Why do bicycle tubes burst mostly in summer?

  1. AThe tube bursts due to heat.
  2. BRubber becomes very weak due to heat.
  3. CHeat causes the rubber to harden and not expand to accommodate air.
  4. Dnone of the above
Show answer & explanation

Answer: A) The tube bursts due to heat.

Q50. When a glass rod is kept in steam, its length increases but its width-

  1. Aremains unaffected
  2. Bdecreases
  3. Cincreases
  4. Dis disorganized
Show answer & explanation

Answer: D) is disorganized

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