- AConducting substances.
- BNon-conducting substances.
- CSemi-conducting substances.
- DNone of the option.
Explanation:
Dielectrics are non-conducting substances.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
For television broadcasting, the frequency employed is normally
|
(a) 30-300 MHz |
(b) 30-300 GHz |
(c) 30-300 KHz |
(d) 30-300 Hz |
The resistance of a galvanometer is 25 ohm and it requires 50μA for full deflection. The value of the shunt resistance required to convert it into an ammeter of 5 amp is
|
(a) 2.5 |
(b) 1.25 |
(c) 0.05 ohm |
(d) 2.5 ohm |
A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black:
A step-up transformer has transformation ratio of 3 : 2. What is the voltage in secondary if voltage in primary is 30 V
| (a) 45 V | (b) 15 V |
(c) 90 V |
(d) 300 V |
A plano-convex lens is made of refractive index of 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
|
(a) 400 cm |
(b) 200 cm |
(c) 100 cm |
(d) 50 cm |
Two charges are at a distance ‘d’ apart. If a copper plate (conducting medium) of thickness is placed between them, the effective force will be
|
(a) 2F |
(b) F / 2 |
(c) 0 |
(d) |