The amount of heat required to change the state of 1 kg of a substance from solid to liquid at its melting point without any change in temperature is called: MCQ with Answer and Explanation
The amount of heat required to change the state of 1 kg of a substance from solid to liquid at its melting point without any change in temperature is called:
A. Latent heat of vaporization
B. Specific heat capacity
C. Latent heat of fusion
D. Thermal capacity
Answer: Option C
Solution (By JKSSB Mock Tests)
The heat required to change a solid into a liquid at its melting point without a temperature rise is called the Latent Heat of Fusion. The word 'latent' means hidden, because this heat energy breaks intermolecular bonds to change the phase rather than increasing the kinetic energy (temperature) of the molecules.
Explanation:
In solids, heat flows by conduction (lattice vibrations and free electrons). Metals are good conductors due to free electrons. Convection in fluids, radiation no medium.
Explanation:
A rocket works on the principle of conservation of linear momentum. As the exhaust gases are expelled downward at high velocity, they carry downward momentum. To conserve the total momentum of the system (which is initially zero), the rocket must acquire an equal and opposite (upward) momentum, propelling it forward.
Explanation:
An isochoric process is a thermodynamic process in which the volume of the closed system remains constant (delta V = 0). Because there is no change in volume, the system does zero pressure-volume work (W = Pdelta V = 0). According to the first law of thermodynamics, any heat added goes entirely into increasing the internal energy. Isobaric is constant pressure; isothermal is constant temperature.
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