- ACharge mobility
- BElectronic mobility
- CStatic electricity
- DCurrent electricity
Explanation:
The study of motion or dynamics of charges constitute an electric current. Therefore, the study of electric charges in motion is called current electricity.
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The radio waves of frequency 300 MHz to 3000 MHz belong to
|
(a) High frequency band |
(b) Very high frequency band |
|
(c) Ultra high frequency band |
(d) Super high frequency band |
A vibration magnetometer consists of two identical bar magnets placed one over the other such that they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is seconds. One of the magnets is removed and if the other magnet oscillates in the same field, then the time period in seconds is
|
(a) |
(b) |
(c) 2 |
(d) |
The shortest wavelength in the Lyman series of hydrogen spectrum is 912 Å corresponding to a photon energy of 13.6 eV. The shortest wavelength in the Balmer series is about
| (a) 3648 Å | (b) 8208 Å | (c) 1228 Å | (d) 6566 Å |
An electron microscope is superior to an optical microscope in
|
(a) Having better resolving power |
(b) Being easy to handle |
|
(c) Low cost |
(d) Quickness of observation |
The focal length of a convex mirror is 20 cm its radius of curvature will be
|
(a) 10 cm |
(b) 20 cm |
(c) 30 cm |
(d) 40 cm |
The current in the arm CD of the circuit will be

|
(a) |
(b) |
(c) |
(d) |
A hollow metal sphere of radius 5cm is charged such that the potential on its surface is 10V. The potential at a distance of 2cm from the centre of the sphere
|
(a) Zero |
(b) 10 V |
(c) 4 V |
(d) 10/3 V |