- AElastomers
- BConductors
- CInsulators
- DPolymers
Explanation:
When an electric field is applied across the ends of conductors, the electrons begin to move under the action of the electric field. The flow of electrons constitutes electric current through the conductor.
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The bending of beam of light around corners of obstacles is called
|
(a) Reflection |
(b) Diffraction |
(c) Refraction |
(d) Interference |
A man of length h requires a mirror, to see his own complete image of length at least equal to
|
(a) |
(b) |
(c) |
(d) h |
A lens of focal power 0.5 D is
|
(a) A convex lens of focal length 0.5 m |
|
(b) A concave lens of focal length 0.5 m |
|
(c) A convex lens of focal length 2 m |
|
(d) A concave lens of focal length 2 m |
A long solenoid of length L has a mean diameter D. It has n layers of windings of N turns each. If it carries a current ‘i’ the magnetic field at its centre will be
|
(a) Proportional to D |
(b) Inversely proportional to D |
|
(c) Independent of D |
(d) Proportional to L |
A charge moves in a circle perpendicular to a magnetic field. The time period of revolution is independent of
|
(a) Magnetic field |
(b) Charge |
|
(c) Mass of the particle |
(d) Velocity of the particle |