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.
Temperature is the property of a body which is proportional to the ____.
total kinetic energy of its molecules
average kinetic energy of its molecules
average speed of its molecules
maximum speed of its molecules
Correct answer is B
The last postulate of the kinetic molecular theory states that the average kinetic energy of a gas particle depends only on the temperature of the gas. Thus, the average kinetic energy of the gas particles increases as the gas becomes warmer
What flows to the positively charged conductor by connecting it to the earth?
Electrons
Ion
Neutron
Proton
Correct answer is A
Earth acts as a ground of zero potential. So when a positively charged conductor is connected to the earth, positive charge flows into the earth and as a result, electrons flow from earth to the conductor.
15.0\(^o\)C
45.0\(^o\)C
52.5\(^o\)C
60.0\(^o\)C
Correct answer is B
Time = 2mins = 2 × 60 = 120secs
Energy = power × time
1000 × 120 = 120,000J
Energy = mc(θ\(_2\) – θ\(_1\))
120,000 = 2 × 4000(θ\(_2\) – θ\(_1\))
θ2 = 30 + 15 = 45 \(^o\) C
15\(^o\)
18\(^o\)
22\(^o\)
24\(^o\)
Correct answer is C
X = \(\frac{4}{3}\) r = ?
Shell’s law:. = \(\frac{Sin i^0}{ Sin r^0}\)
= \(\frac{Sin 30^0}{Sin r^0}\)
Sin\(r^0\) = \(\frac{3 Sin 30^0}{4}\)
Sin \(r^0\) = 0.375
R \(^o\) = Sin-1 (0.375)
R \(^o\) = 22.02 \(^o\)
R \(^o\) = 22 \(^o\)
The resistance of a 40W car head lamp, drawing current from a 12V battery is ____.
0.3Ω
3.3Ω
3.6Ω
4.8Ω
Correct answer is C
Power delivered to head lamp = \(\frac{V_2}{R}\)
= 40W
R = \(\frac{V_2}{40}\)
= \(\frac{(12 × 2)}{40}\)
= 3.6Ω