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.
P
Q
R
S
Correct answer is B
The determinant of the brightness of a bulb is the power (watts) of the circuit.
Recall that Power (P) = \(\frac{V^2}{R}\).
Since the resistance is to be used as a divisor, it means the smaller the resistance, the greater the power.
0.63A
0.50A
0.31A
0.22A
Correct answer is A
I = \(\frac{f}{n} = \frac{1}{6 - 2}\)
I = \(\frac{v}{R + r} = \frac{2}{3} + \frac{1}{6} = 0.63\)A
possesses low internal resistance
can be recharges
has shorter life span
possesses high e.m.f
Correct answer is D
No explanation has been provided for this answer.
6.0 x 10-5C
1.2 x 10-4C
2.4 x 10-4C
4.8 x 10-4C
Correct answer is C
C = \(C_1 + C_2 = 2 + 2 = 4 \mu F\)
but Q = CV
= 4 x 10\(^{-6}\) x 120
= 4.8 x 10\(^{-4}\)
\(\therefore\) Each of the capacitor has a charge of \(\frac{4.8 \times 10^{-4}}{2}\)
= 2.4 x 10\(^{-4}\) C
When two like charges are brought together, the potential energy of the system formed will
increase because work is done against the field
increase because work is done by the field
decrease because work is done by the field
decrease because work is done against the field
Correct answer is A
if two like charges are close together, they repel each other. moving them closer together requires working against repulsive force which increases the potential energy of the system.