Which one is reverse-biased
|
(a) |
(b) |
(c) |
(d) |
Which one is reverse-biased
|
(a) |
(b) |
(c) |
(d) |
(c)
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
When a certain circuit consisting of a constant e.m.f. E an inductance L and a resistance R is closed, the current in, it increases with time according to curve 1. After one parameter (E, L or R) is changed, the increase in current follows curve 2 when the circuit is closed second time. Which parameter was changed and in what direction

|
(a) L is increased |
(b) L is decreased |
(c) R is increased |
(d) R is decreased |
Two charged spheres of radii 10 cm and 15 cm are connected by a thin wire. No current will flow, if they have
|
(a) The same charge on each |
(b) The same potential |
|
(c) The same energy |
(d) The same field on their surfaces |
Two parallel pillars are 11 km away from an observer. The minimum distance between the pillars so that they can be seen separately will be
|
(a) 3.2 m |
(b) 20.8 m |
(c) 91.5 m |
(d) 183 m |
Diffraction effects are easier to notice in the case of sound waves than in the case of light waves because
|
(a) Sound waves are longitudinal |
(b) Sound is perceived by the ear |
|
(c) Sound waves are mechanical waves |
(d) Sound waves are of longer wavelength |
On an electric heater 220 volt and 1100 watt are marked. On using it for 4 hours, the energy consumed in kWh will be
|
(a) 2 |
(b) 4.4 |
(c) 6 |
(d) 8 |