Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
4.5Ω
5Ω
1Ω
4Ω
Correct answer is A
E = 2V, r = 0.5Ω, I = 0.4A, P = ?
E = I( R + r )
R = \(\frac{ E}{I} - r \)
R = \(\frac{ 2}{0.4} - 0.5\)
R = 5 - 0.5 = 4.5Ω
massive body has a higher momentum.
massive body builds up a higher velocity.
lighter body has a higher momentum.
momenta of both bodies remain the same.
Correct answer is D
When a lightweight body and a massive body are acted upon by the same force for the same time, the momenta of both bodies remain the same.
Given that the momenta of both the heavy and light bodies are the same, it follows that the light body possesses a higher velocity compared to the heavy body.
a given mass of molten lead to vapour at constant temperature and pressure.
1 kg of molten lead to vapour at constant temperature and pressure.
1 kg of solid lead to vapour at constant temperature and pressure.
1 kg of molten lead to vapour for every degree rise in temperature.
Correct answer is B
The specific latent heat of vaporization of lead is the amount of thermal energy required to change 1 kg of molten lead to vapor at constant temperature and pressure.
most energetic molecules leave the surface and escape into the air.
least energetic molecules leave the surface and escape into air.
most energetic molecules leave the surface and return.
least energetic molecules leave the surface and return.
Correct answer is A
The statement that explains the observation is:
The most energetic molecules leave the surface and escape into the air.
This phenomenon is known as evaporation. In a liquid, molecules have varying energies, and the molecules with higher kinetic energies (the most energetic ones) are more likely to overcome the attractive forces within the liquid and transition into the gaseous phase. These molecules escape from the surface of the liquid into the air, gradually reducing the amount of liquid in the open dish. Evaporation is a process that occurs continuously as long as there is a liquid exposed to the air.
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