As pressure is applied to ice, the melting point of the ice ?

D. First increases then decreases

Why are ice blocks covered with sawdust?

A. To provide necessary insulation from heat

B. To prevent the ice from melting due to pressure

C. To absorb moisture from the surrounding air

D. To increase the weight and stability of the ice blocks

Everyday Science · Physics in Everyday Life · page 20 of 41

Heat & Thermodynamics MCQs with Answers

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Heat & Thermodynamics MCQs (191–200)

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Past paper MCQs in this chapter · See all past papers

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191.
True/False: The density of water is maximum at 5°C.
Correct Answer: B. False
One-liner
The statement is False — the density of water is maximum at 4°C, not 5°C.
192.
Thermal energy transfer required per unit mass to increase the temperature by 1°C or 1 K is called?
Correct Answer: A. Specific heat capacity
One-liner
The thermal energy required per unit mass to raise the temperature by 1°C or 1 K is called specific heat capacity.
193.
By increasing the temperature, the movement of molecules ?
Correct Answer: A. Increases
One-liner
By increasing the temperature, the movement of molecules increases.
194.
As pressure is applied to ice, the melting point of the ice ?
Correct Answer: B. Decreases
One-liner
As pressure is applied to ice, its melting point decreases — a phenomenon known as regelation.
195.
Standard Temperature and Pressure (STP) is?
Correct Answer: D. Both A and C
One-liner
Standard Temperature and Pressure (STP) is defined as 0°C (273.15 K) and 1 atm pressure (760 mm of Hg) — both A and C are correct representations of the same condition.
196.
If ΔH < 0, the reaction is:
Correct Answer: B. Exothermic
One-liner
If ΔH < 0, the reaction is exothermic, meaning it releases heat to the surroundings.
197.
A mode of heat transfer that occurs by the mass motion of a fluid is called?
Correct Answer: B. Convection
One-liner
The mode of heat transfer that occurs by the mass motion of a fluid is called convection.
198.
Expansion in length of solids on heating is called _?
Correct Answer: B. Thermal expansion
One-liner
Expansion in length of solids on heating is called thermal expansion (specifically, linear thermal expansion).
199.
Why are ice blocks covered with sawdust?
Correct Answer: A. To provide necessary insulation from heat
One-liner
Ice blocks are covered with sawdust to provide necessary insulation from heat, as sawdust is a poor conductor of heat and slows down the melting process.
200.
Zeroth law of thermodynamics tells us about?
Correct Answer: C. Temperature
One-liner
The zeroth law of thermodynamics tells us about temperature and forms the basis for temperature measurement.

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Heat & Thermodynamics MCQs with Answers

Heat & Thermodynamics MCQs (191–200)

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