Current Electricity — Physics STD 10 — Question

Two waves A and B have wavelength 0.01 Å and 9000 Å respectively.
(a) Name the two waves.
(b) Compare the speeds of these waves when they travel in vacuum.

How do infrared and γ-rays differ in penetrating power.

How is e.m.f. in primary and secondary coils of a transformer related with the number of turns in these coils?

What do you mean by focal plane of a lens?

Name a machine which is used to change the direction for force applied.

Name the type of energy possessed by the bob of a simple pendulum when it is at the mean position

Arrange the following radiations in the order of their increasing wavelength:
X-rays, infrared rays, ratio waves, gamma ray and micro waves?

How will you differentiate between a convex and a concave lens by looking at a distant object.

Name a common device where a hot cathode ray tube is used.