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.
The direction of induced current in a straight wire placed in magnetic field is determined by using?
Fleming's right hand rule
Maxwell's screw rule
Faraday's law
Lenz's law
Correct answer is D
Lenz's law, in electromagnetism, statement that an induced electric current flows in a direction such that the current opposes the change that induced it.
One difference between a reactance and a resistance in an alternating current circuit is
resistance is larger than reactance
energy is not diaaipated in a reactance
energy is stored in a resistance but not in a reactance
the current in a reactance is lower than in the resistance
Correct answer is D
No explanation has been provided for this answer.
10V
20V
25V
400V
Correct answer is B
\(V^2 = PR = V = \sqrt{4} \times 100\)
= 20V
A lamp is rated 240V 60W, calculate the resistance of its filament
240\(\Omega\)
360\(\Omega\)
960\(\Omega\)
1440\(\Omega\)
Correct answer is C
R = \(\frac{V^2}{P} = \frac{240^2}{60} = 960\Omega\)
100.0C
10.0C
1.0C
0.1C
Correct answer is A
Q = it
= 10 x 10 = 100C