Physics Past Questions and Answers

A submarine is observed to rise from a real depth off 80 m to 60 m in water. calculate the change in apparent depth.
[Refraction index of water (4)/3]

Non-luminous object can be seen because they

The wavelength of the first overtone of a note in a closed pipe of length 33 cm is?

A person can focus objects when they lie beyond 75 cm from his eyes. The focal length of the lens required to reduce his least distance of distinct vision to 25 cm is?

If two charged plates are maintained at a potential difference of 3 kv, the work done in taking a charge of 600 µC across the field is?