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.
An object is placed 15cm in front of a concave mirror of radius 40cm. The image formed is
virtual and 60cm behind the mirror
real and 60cm behind the mirror
virtual and at infinity
real and at infinity
virtual and 40cm from the mirror
Correct answer is A
u = f
50cm
70cm
100cm
150cm
200cm
Correct answer is A
\(\lambda\) = \(\frac{v}{f}\)
= \(\frac{340}{170}\)
= 2m ; for closed pipe
L = \(\frac{1}{4}\)\(\lambda\)
= \(\frac{1}{4}\) x \(\frac{2}{1}\)
= 0.5m
= 50cm
When a sound wave passes from air into water its
speed and frequency increases but its wavelength remains the same
speed and wavelength increases but its frequency remains the same
speed decreases
speed remains the same but its frequency and wavelength change
speed increases but its frequency and wavelength decreases
Correct answer is C
No explanation has been provided for this answer.
0.75km
1.50km
2.20km
3.00km
3.75km
Correct answer is A
Echo time = 1 \(\div\) 2 = 0.5sec
depth = velocity x time
= 1500 x 0.5
= 750m = 0.75km
Which of the following phenomena CANNOT be explained by the molecular theory of matter?
Expansion
Conduction
Convection
Radiation
Evaporation
Correct answer is D
No explanation has been provided for this answer.