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.
20,000 ohms in parallel
19,990 ohms in series
1990 ohms in series
100 ohms in series
Correct answer is C
No explanation has been provided for this answer.
The heat produced in a conductor carrying an electric current is
inversely proportional to the current and the resistance
directly proportional to the current, resistance and the time
inversely proportional to of the resistance, current and the time
directly proportional to the square of the current, the resistance and the time
Correct answer is D
No explanation has been provided for this answer.
Which of the following apparatus will require the smallest fuse rating for its protection?
60W, 240V
60W, 40V
40W, 12V
40W, 5V
Correct answer is A
I = \(\frac{P}{V}\) = \(\frac{60}{240}\) = 0.25A
I = \(\frac{P}{V}\) = \(\frac{60}{40}\) = 1.5A
I = \(\frac{P}{V}\) = \(\frac{40}{12}\) = 3.3A
I = \(\frac{P}{V}\) = \(\frac{40}{5}\) = 8A
2.5\(\mu\)C
10.0\(\mu\)C
20.0\(\mu\)C
50.0\(\mu\)C
Correct answer is B
Q = cv
= 2 x 10-6 x 5
= 10 x 10-6C
= 10.0\(\mu\)C
1.5 x 10-4m2
1.0 x 10-4m2
2.7 x 10-5m2
7.3 x 10-6m2
Correct answer is B
Resistivity = \(\frac{\text {Resiatance x Area}}{length}\)
1.6 x 10-6 = \(\frac{15 \times Area}{0.27}\)
Area = 1.0 x 10-4m2