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.
6.5 cm
7.5 cm
8.5 cm
4.5 cm
Correct answer is B
u + v = 40
\(\frac{v}{u}\) = 3
v = 3u
u + 3u = 40
4u = 40
u = 10cm
v = 3u = 30cm
f = \(\frac{uv}{u + v} = \frac{10(30)}{10 + 30} = \frac{300}{40}\)
= 7.5 cm
When the temperature of a liquid is increased, its surface tension?
increases
decreases
remain constant
increases then decreases
Correct answer is B
Surface tension or elasticity of a fluid decreases with increased temperature
Ripple in a power supply unit is caused by
using an alternating current source
forward voltage drop
heavy load
using a zener diode
Correct answer is A
The fluctuation of d.c signal results from the rectification of A.C source to d.c.
Which of the following equations is the correct definition of the reactance of an indicator L?
Reactance = (Amplitude of voltage) \(\div\) (Amplitude of current)
Reactance = (Amplitude of voltage) x (Amplitude of current)
Reactance = (Amplitude of current)\(^2\) \(\div\) (Amplitude of voltage)
Reactance = (Amplitude of current)\(^2\) \(\div\) (Amplitude of voltage)\(\frac{1}{2}\)
Correct answer is A
Reactance is the value of an indicator or a capacitor in ohms
I only
II only
I & II only
I, II & III only
Correct answer is C
Rutherford assumed that (I) energy is radiated when electrons are revolving (II) energy is radiated in a continuous mode. These are limitations of Rutherford's model