Temperature and its Measurement Part 4: MCQs (Q76–Q100)
Part 4 — Questions 76–100 (Advanced applications, conversions & revision)
76. Which scale is based on absolute zero?
A. Celsius
B. Fahrenheit
C. Kelvin ← Correct Answer
D. Reaumur
Explanation:
A/B/D) Arbitrary zero points.
C) Correct — Kelvin starts at 0 K (absolute zero).
77. Why is mercury dangerous if a thermometer breaks?
A. Evaporates quickly
B. Toxic and poisonous metal ← Correct Answer
C. Causes glass to shatter
D. Burns skin like acid
Explanation:
A/C/D) Not main reason.
B) Correct — mercury vapors are poisonous.
78. Which of the following is NOT used to measure temperature?
A. Thermometer
B. Pyrometer
C. Hygrometer ← Correct Answer
D. Digital probe
Explanation:
A/B/D) All measure temperature.
C) Correct — hygrometer measures humidity, not temperature.
79. Which thermometer is safest for children?
A. Mercury clinical
B. Laboratory
C. Digital thermometer ← Correct Answer
D. Alcohol thermometer
Explanation:
A/B/D) Glass breakage risks.
C) Correct — digital thermometers avoid mercury hazards.
80. The Celsius equivalent of 212°F is
A. 100°C
B. 32°C
C. 100°C ← Correct Answer
D. 0°C
Explanation:
A/C are the same.
212°F = 100°C.
B/D) Incorrect.
81. Which property of liquids is used in thermometers?
A. Freezing
B. Expansion with temperature ← Correct Answer
C. Melting point
D. Evaporation
Explanation:
B) Correct — liquids expand when heated, principle of thermometers.
82. A thermometer without mercury uses
A. Water
B. Alcohol or digital sensors ← Correct Answer
C. Salt solution
D. Air
Explanation:
A/C/D) Not suitable.
B) Correct — alcohol or electronic sensors are alternatives.
83. Which of the following is the correct order of scales from smallest to largest increment?
A. Celsius < Kelvin < Fahrenheit
B. Fahrenheit < Celsius = Kelvin ← Correct Answer
C. Kelvin < Fahrenheit < Celsius
D. All equal
Explanation:
B) Correct — 1°F smaller than 1°C or 1 K (same size increments).
84. The laboratory thermometer should never be held by the bulb because
A. Mercury escapes
B. Heat of hand affects reading ← Correct Answer
C. Scale disappears
D. Glass melts
Explanation:
B) Correct — hand warms bulb, gives wrong reading.
85. Which thermometer uses bimetallic strips?
A. Clinical thermometer
B. Room or industrial thermostats ← Correct Answer
C. Digital thermometer
D. Pyrometer
Explanation:
A/C/D) Not strip-based.
B) Correct — bimetallic strips bend with heat, used in thermostats.
86. 100 K corresponds to
A. –173°C
B. –173°C ← Correct Answer
C. 100°C
D. 373°C
Explanation:
Convert: 100 – 273 = –173°C.
B) Correct.
87. Which of these is the hottest?
A. 0°C
B. 100°F
C. 100°C ← Correct Answer
D. 273 K
Explanation:
A = 32°F; B ≈ 37.7°C; D = 0°C.
C) Correct — 100°C is hottest.
88. Why should we not use mercury thermometers in refrigerators?
A. Mercury too heavy
B. Glass breaks
C. Mercury freezes below –39°C ← Correct Answer
D. Gives high readings
Explanation:
A/B/D) Not main.
C) Correct — below –39°C mercury freezes, can’t measure.
89. Which of the following is measured in °C?
A. Heat
B. Energy
C. Temperature ← Correct Answer
D. Work
Explanation:
A/B/D) Measured in joules.
C) Correct — °C is unit of temperature.
90. Which of the following is the coldest?
A. 0°C
B. 273 K
C. 32°F
D. –40°C ← Correct Answer
Explanation:
D) Correct — –40°C is colder than all others listed.
91. Which of these is a precaution for clinical thermometer?
A. Shake after use
B. Don’t dip in boiling water
C. Do not bite bulb
D. All of the above ← Correct Answer
Explanation:
D) Correct — all precautions are necessary.
92. A body at 20°C is heated till its temperature doubles on the Kelvin scale. What is the new temperature?
A. 40°C
B. 293 K
C. 566 K (293 × 2) = 293°C ← Correct Answer
D. 0°C
Explanation:
Convert 20°C = 293 K → doubled = 566 K → 293°C.
C) Correct.
93. Which of these thermometers is used for meteorological studies?
A. Clinical thermometer
B. Maximum–minimum thermometer ← Correct Answer
C. Digital thermometer
D. Alcohol thermometer
Explanation:
B) Correct — used for recording daily highs/lows in weather.
94. Why is alcohol dyed in thermometers?
A. Looks beautiful
B. Prevents freezing
C. Makes level visible ← Correct Answer
D. Prevents evaporation
Explanation:
A/B/D) Wrong.
C) Correct — dye improves visibility.
95. Which thermometer is commonly used in kitchen ovens?
A. Clinical thermometer
B. Laboratory thermometer
C. Oven thermometer (dial or digital) ← Correct Answer
D. Maximum–minimum thermometer
Explanation:
A/B/D) Not designed for ovens.
C) Correct — special oven thermometers withstand high temps.
96. Which one shows temperature change without contact?
A. Mercury thermometer
B. Infrared thermometer ← Correct Answer
C. Laboratory thermometer
D. Alcohol thermometer
Explanation:
A/C/D) Contact needed.
B) Correct — infrared detects heat radiation remotely.
97. Why are thermometers calibrated?
A. Decoration
B. To ensure accuracy in readings ← Correct Answer
C. To look uniform
D. To make them fragile
Explanation:
B) Correct — calibration aligns with standard points.
98. Which of these statements is true?
A. 0 K = 0°C
B. 0 K = –273°C ← Correct Answer
C. 0°C = 0 K
D. 100 K = 100°C
Explanation:
B) Correct — absolute zero is –273°C.
99. Why are digital thermometers replacing mercury thermometers?
A. More expensive
B. Safer, no mercury, quick accurate results ← Correct Answer
C. More toxic
D. Harder to read
Explanation:
B) Correct — digital are eco-friendly and safe.
100. Final revision: Which is the correct summary?
A. Heat and temperature are same
B. Temperature in joules
C. Heat in °C
D. Heat is energy in joules, temperature is degree of hotness in °C/K/F ← Correct Answer
Explanation:
D) Correct — clear difference between heat and temperature.
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