Light waves
(a) Can travel in perfect vacuum
(b) Require air to travel through
(c) Require an electric field to travel through
(d) Require a magnetic field to travel through
Physics MCQs
Radio waves, microwaves, infra-red spectrum, ultraviolet rays, X-rays and gamma rays are classified as
(a) Light wives
(b) Electromagnetic waves
(c) Electric waves
(d) Magnetic waves
Escape velocity from ‘the Earth’s surface is
(a) Equal to that from the Moon’s surface
(b) Greater than that from the Moon’s surface
(c) Less than that from the Moon’s surface
(d) Equal -to that from the Sun’s surface
Which of the following is an insulator?
(a) Mica
(b) Ebonite
(c) Plastic
(d) All the above
Bodies which do not allow the charge to pass through are called
(a) Conductors
(b) Capacitors
(c) Insulators
(d) Resistors
Bodies which allow the charge to pass through are called
(a) Conductors
(b) Insulators
(c) Dielectrics
(d) None of the above
Soft iron is used to manufacture electromagnets, because their
(a) Magnetic saturation limit is high and retentivity and coercive force are small
(b) Retentivity is high
(c) Coercive force is high
(d) Area of hysteresis is .large
The splitting of different colors of light in a prism is
(a) Reflection of light
(b) Dispersion of light
(c) Diffraction of light
(d) Refraction of light
The speed of light will be minimum while passing through
(a) Glass
(b) Vacuum
(c) Water
(d) Air
The basic reason for the extraordinary sparkle of a suitably cut diamond is that
(a) It has a very high transparency
(b) It has a very high refractive index
(c) It is very hard
(d) It has well defined cleavage planes