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. Thermal capacity
B. Latent heat of vaporization
C. Latent heat of fusion
D. Specific heat 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:
Polarization requires transverse waves. Sound in air is longitudinal (oscillations ∥ propagation) ⇒ cannot be polarized. EM waves (light, radio, X-rays) are transverse ⇒ can be polarized. Memory tip: 'Polarization ⇒ transverse only; sound = longitudinal ⇒ no polarization'. Wave property frequently tested in competitive exams.
Explanation:
Centripetal force acts towards centre, necessary for circular motion. Centrifugal is pseudo-force in rotating frame. In uniform circular motion, centripetal force = mv²/r.
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