An air filled parallel plate capacitor has capacity C. If distance between plates is doubled and it is immersed in a liquid then capacity becomes twice. Dielectric constant of the liquid is
|
(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |
(d) 4
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A parallel plate capacitor carries a charge q. The distance between the plates is doubled by application of a force. The work done by the force is
|
(a) Zero |
(b) |
(c) |
(d) |
X-rays of 
have frequency
|
(a) 3 |
(b) 3 |
(c) |
(d) |
Light of different colours propagates through air
|
(a) With the velocity of air |
|
(b) With different velocities |
|
(c) With the velocity of sound |
|
(d) Having the equal velocities |
What will be the angular width of central maxima in Fraunhoffer diffraction when light of wavelength 6000 
is used and slit width is 12
|
(a) 2 rad |
(b) 3 rad |
(c) 1 rad |
(d) 8 rad |
Three long, straight parallel wires carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire C is
|
(a) 10-3 N |
(b) 2.5 ×10-3 N |
(c) Zero |
(d) 1.5 × 10-3 N |
A thin mica sheet of thickness 2 
and refractive index μ = 1.5 is introduced in the path of the first wave. The wavelength of the wave used is 5000 Å. The central bright maximum will shift
|
(a) 2 fringes upward |
(b) 2 fringes downward |
(c) 10 fringes upward |
(d) None of these |
