Two capacitors each of 1μF capacitance are connected in parallel and are then charged by 200 volts d.c. supply. The total energy of their charges (in joules) is
|
(a) 0.01 |
(b) 0.02 |
(c) 0.04 |
(d) 0.06 |
(c) 0.04
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The de-Broglie wavelength is proportional to
|
(a) λ ∝ |
(b) λ ∝ |
(c) λ ∝ |
(d) λ ∝ p |
Light of wavelength 5000 Å falls on a sensitive plate with photoelectric work function of 1.9 eV. The kinetic energy of the photoelectron emitted will be
|
(a) 0.58 eV |
(b) 2.48 eV |
(c) 1.24 eV |
(d) 1.16 eV |
How much energy in kilowatt hour is consumed in operating ten 50 watt bulbs for 10 hours per day in a month (30 days).
|
(a) 1500 |
(b) 5,000 |
(c) 15 |
(d) 150 |
Figure shows the cross-sectional view of the hollow cylindrical conductor with inner radius 'R' and outer radius '2R', cylinder carrying uniformly distributed current along it's axis. The magnetic induction at point 'P' at a distance 
from the axis of the cylinder will be
|
(a) Zero |
(b) |
(c) |
(d) |
Two voltameters, one of copper and another of silver, are joined in parallel. When a total charge q flows through the voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are 
and 
respectively the charge which flows through the silver voltameter is
|
(a) |
(b) |
(c) |
(d) |
The equivalent quantity of mass in electricity is
|
(a) Charge |
(b) Potential |
(c) Inductance |
(d) Current |
Material A has critical angle 
and material B has critical angle 
. Then which of the following is true
(i) Light can be totally internally reflected when it passes from B to A
(ii) Light can be totally internally reflected when it passes from A to B
(iii) Critical angle for total internal reflection is 
(iv) Critical angle between A and B is 
|
(a) (i) and (iii) |
(b) (i) and (iv) |
(c) (ii) and (iii) |
(d) (ii) and (iv) |
