A light ray enters from air into glass. How does its speed, frequency, and wavelength change? MCQ with Answer and Explanation
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Question #1
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Which color of light is scattered most by atmosphere?
Question #2
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A transformer has 50 turns in the primary coil and 1000 turns in the secondary coil. If the primary voltage is 220V, what is the secondary voltage?
Correct Answer: Option C
Explanation:
The transformer equation relates voltages to the number of turns: V_secondary / V_primary = N_secondary / N_primary. We have N_p = 50, N_s = 1000, and V_p = 220V. Substituting the values gives V_s / 220 = 1000 / 50. V_s = 220 * 20 = 4400 Volts. This is a step-up transformer, increasing the voltage strictly by a factor of 20.
The transformer equation relates voltages to the number of turns: V_secondary / V_primary = N_secondary / N_primary. We have N_p = 50, N_s = 1000, and V_p = 220V. Substituting the values gives V_s / 220 = 1000 / 50. V_s = 220 * 20 = 4400 Volts. This is a step-up transformer, increasing the voltage strictly by a factor of 20.
Question #3
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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:
Correct Answer: Option B
Explanation:
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.
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.
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