2μF capacitance has potential difference across its two terminals 200 volts. It is disconnected with battery and then another uncharged capacitance is connected in parallel to it, then P.D. becomes 20 volts. Then the capacity of another capacitance will be
|
(a) 2 μF |
(b) 4 μF |
(c) 18 μF |
(d) 10 μF |
(c) 18 μF
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The inductance of a solenoid 0.5 m long of cross-sectional area 20 cm2 and with 500 turns is
|
(a) 12.5 mH |
(b) 1.25 mH |
(c) 15.0 mH |
(d) 0.12 mH |
Light of two different frequencies whose photons have energies 1eV and 2.5eV respectively, successively illuminates a metal of work function 0.5eV. The ratio of maximum kinetic energy of the emitted electron will be
|
(a) 1 : 5 |
(b) 1 : 4 |
(c) 1 : 2 |
(d) 1 : 1 |
An electromagnetic wave, going through vacuum is described by
. Which of the following is independent of wavelength
| (a) k | (b) w | (c) k/w | (d) kw |
The equation 
is
|
(a) b -emission |
(b) a -emission |
(c) e– capture |
(d) Fission |
Smaller pieces of heavy stones and metals which on entering earth's atmosphere burns out are
|
(a) Comets |
(b) Meteorites |
(c) Asteroids |
(d) All of these |
The characteristic impedance of a coaxial cable is of the order of
|
(a) 50 W |
(b) 200 W |
(c) 270 W |
(d) None of these |