Heat and Thermodynamics| Practice MCQs Physics for Mdcat | mosaicbro.com

Heat and Thermodynamics| Practice MCQs Physics for Mdcat

7 of 106 questions (Page 9 of 16)

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57 Heat gained (or lost) by a body of mass $m$ and specific heat $c$ when its temperature is raised through $\Delta T$, is given by:
Correct Answer: C
Explanation: The formula is $\Delta Q = m c \Delta T$.
58 The amount of heat needed to raise the temperature of 1 gram of water through $1 C^\circ$ is called:
Correct Answer: B
Explanation: 1 calorie is the heat needed to raise 1 gram of water by $1^\circ C$.
59 The amount of heat needed to raise the temperature of 1 kg of water through $1K^\circ$ is called:
Correct Answer: B
Explanation: 1 kilocalorie is the heat needed to raise 1 kg of water by $1 K$.
60 The heat capacity per unit mass of a body is called:
Correct Answer: C
Explanation: Specific heat is heat capacity per unit mass.
61 Heat needed to melt 1kg of ice at its melting point without change of temperature is called:
Correct Answer: D
Explanation: This is the definition of latent heat of fusion.
62 The quantity of heat needed to raise the temperature of 1 mole of a substance through $1K^\circ$ is called:
Correct Answer: B
Explanation: Molar heat capacity is heat per mole per Kelvin.
63 For a monoatomic gas, if $C_p$ and $C_v$ represent specific heats at constant pressure and at constant volume respectively, then:
Correct Answer: C
Explanation: For monoatomic gases, $C_p > C_v$ due to work done during expansion.
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