Temperature and its Measurement Part 2: MCQs (Q26–Q50)

Part 2 — Questions 26–50 (Conversions, thermometer use, precautions, heat vs. temperature)

26. The Fahrenheit equivalent of 0°C is

A. 273°F
B. 100°F
C. 32°F ← Correct Answer
D. 0°F
Explanation:
A/B/D) Incorrect values.
C) Correct — freezing point of water is 32°F.

27. The Fahrenheit equivalent of 100°C is

A. 212°F ← Correct Answer
B. 0°F
C. 98.6°F
D. 32°F
Explanation:
A) Correct — boiling point of water = 212°F.
B/C/D) Incorrect.

28. Which of the following is true for laboratory thermometers?

A. Range 35–42°C
B. Range –10 to 110°C ← Correct Answer
C. Has a kink in the tube
D. Used for body temperature
Explanation:
A/C/D) Features of clinical thermometer.
B) Correct — lab thermometers measure –10 to 110°C.

29. The “kink” in a clinical thermometer is useful because

A. Prevents heat loss
B. Prevents mercury from falling back quickly ← Correct Answer
C. Increases brightness
D. Protects glass
Explanation:
A/C/D) Wrong reasons.
B) Correct — kink traps mercury for easy reading.

30. Before using a clinical thermometer, it should be

A. Shaken to lower mercury level ← Correct Answer
B. Heated in boiling water
C. Kept in freezer
D. Broken at the bulb
Explanation:
A) Correct — mercury must be brought below normal body temp.
B/C/D) Dangerous or incorrect.

31. Heat is a form of

A. Matter
B. Energy ← Correct Answer
C. Force
D. Mass
Explanation:
A/D) Wrong.
B) Correct — heat is energy transferred due to temperature difference.
C) Force is different.

32. Which of the following is true about temperature and heat?

A. Same quantity
B. Heat is energy; temperature measures hotness ← Correct Answer
C. Heat is measured in °C
D. Temperature in joules
Explanation:
A) Wrong.
B) Correct — heat in joules, temp in °C/K.
C/D) Wrong units.

33. Which unit is used to measure heat?

A. Degree Celsius
B. Joule ← Correct Answer
C. Kelvin
D. Fahrenheit
Explanation:
A/C/D) Units of temperature.
B) Correct — joule is SI unit of heat.

34. Heat transfer between solids in direct contact is called

A. Radiation
B. Convection
C. Conduction ← Correct Answer
D. Fusion
Explanation:
A/B/D) Other processes.
C) Correct — conduction is heat transfer in solids by contact.

35. The heat transfer that does not need a medium is

A. Conduction
B. Convection
C. Radiation ← Correct Answer
D. Fusion
Explanation:
A/B) Need medium.
C) Correct — radiation travels even in vacuum (e.g., sunlight).
D) Phase change, not heat transfer.

36. When mercury expands in a thermometer, it indicates

A. Pressure change
B. Rise in temperature ← Correct Answer
C. Fall in temperature
D. No change
Explanation:
A/C/D) Wrong.
B) Correct — expansion = higher temperature.

37. The boiling point of water in Kelvin scale is

A. 373 K ← Correct Answer
B. 273 K
C. 212 K
D. 0 K
Explanation:
A) Correct — 100°C = 373 K.
B) 0°C = 273 K.
C/D) Wrong.

38. The freezing point of water in Kelvin scale is

A. 100 K
B. 373 K
C. 273 K ← Correct Answer
D. 0 K
Explanation:
A/B/D) Incorrect.
C) Correct — 0°C = 273 K.

39. Which thermometer is used in weather stations?

A. Clinical
B. Laboratory
C. Maximum–minimum thermometer ← Correct Answer
D. Digital
Explanation:
A/B/D) Not specific.
C) Correct — used to record daily max/min temperatures.

40. Which thermometer is suitable for measuring very high temperatures in furnaces?

A. Clinical
B. Mercury thermometer
C. Pyrometer ← Correct Answer
D. Alcohol thermometer
Explanation:
A/B/D) Not designed for extreme heat.
C) Correct — pyrometers measure very high temps.

41. Temperature is measured using which physical property of liquids?

A. Color change
B. Expansion on heating ← Correct Answer
C. Evaporation rate
D. Pressure change
Explanation:
A/C/D) Not reliable in thermometer.
B) Correct — expansion principle used.

42. Which of the following is the coldest temperature?

A. 0°C
B. 0 K
C. –100°C
D. –273°C ← Correct Answer
Explanation:
A/B/C) Warmer than absolute zero.
D) Correct — –273°C = absolute zero, coldest possible.

43. A laboratory thermometer has no kink because

A. Looks better
B. Saves mercury
C. It needs mercury to rise and fall freely with liquid temp ← Correct Answer
D. Easier to carry
Explanation:
A/B/D) Wrong.
C) Correct — free movement is required.

44. Digital thermometers show readings in

A. Analogue thread
B. Digital numbers ← Correct Answer
C. Color bands
D. Liquid columns
Explanation:
A/C/D) Not used.
B) Correct — numbers displayed on screen.

45. Which is NOT a good precaution while using a laboratory thermometer?

A. Keep upright
B. Bulb dipped in substance
C. Note without parallax error
D. Put bulb in mouth ← Correct Answer
Explanation:
A/B/C) Correct precautions.
D) Correct — lab thermometers never used on humans.

46. 20°C equals how many Kelvin?

A. 293 K ← Correct Answer
B. 253 K
C. 313 K
D. 373 K
Explanation:
A) Correct — 20 + 273 = 293 K.
B/C/D) Wrong conversions.

47. Heat always flows from

A. Hotter body to colder body ← Correct Answer
B. Colder to hotter
C. Same temperature to same
D. None
Explanation:
A) Correct — second law of thermodynamics.
B/C/D) Wrong.

48. Which thermometer is most suitable for measuring –50°C?

A. Alcohol thermometer ← Correct Answer
B. Mercury thermometer
C. Clinical thermometer
D. Digital thermometer only
Explanation:
A) Correct — alcohol works at low temp.
B/C) Not suitable.
D) Possible but alcohol thermometer is standard.

49. Which is NOT a use of temperature measurement?

A. Weather forecasting
B. Cooking control
C. Medical diagnosis
D. Measuring length ← Correct Answer
Explanation:
A/B/C) Require temperature.
D) Correct — length not measured by temperature.

50. Which of the following pairs is correct?

A. 0 K → 0°C
B. 0°C → 273 K
C. 100°C → 373 K ← Correct Answer
D. 32°C → 0°F
Explanation:
A/D) Wrong.
B) 0°C = 273 K but option C is more precise.
C) Correct — 100°C = 373 K.

CBSE Class 6 MCQs, NCERT Chapter 7 MCQs, Temperature Measurement MCQs, Online CBSE Revision, Board Exam Practice, CBSE Class 6 Temperature and Measurement MCQs with answers, NCERT Chapter 7 Class 6 Science MCQ practice online, important exam MCQs for CBSE Class 6 NCERT syllabus, downloadable Class 6 Science Chapter 7 MCQs with answer key, online learning MCQs for CBSE Class 6 board exam revision