MCQ
Electrostatic is the branch of physics which deals with the:
- AForces between charges in motion.
- BForces between charges in rest.
- CBoth a and b.
- DNone.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A plano convex lens (f = 20cm) is silvered at plane surface. Now f will be
|
(a) 20 cm |
(b) 40 cm |
(c) 30 cm |
(d) 10 cm |
The heating coils rating at 220 volt and producing 50 cal/sec heat are available with the resistances 55Ω,110 Ω, 220 Ω and 440 Ω. The heater of maximum power will be of
|
(a) 440 Ω |
(b) 220 Ω |
(c) 110 Ω |
(d) 55 Ω |
In X-ray tube when the accelerating voltage V is halved, the difference between the wavelength of Ka line and minimum wavelength of continuous X-ray spectrum
|
(a) Remains constant |
(b) Becomes more than two times |
|
(c) Becomes half |
(d) Becomes less than two times |
The light when enters the human eye experiences most of the refraction while passing through
|
(a) Cornea |
(b) Aqueous humour |
(c) Vitrous humour |
(d) Crystalline lens |
The activity of a radioactive sample
|
(a) Can be increased by heating it |
(b) Is independent of physical parameter |
|
(c) Cannot be increased by any method |
(d) Both (b) and (c) |