Current Electricity — Physics STD 12 Science — Question

The charge on any one of the 2 μF  capacitors and 1 μF  capacitor will be given respectively (in μC ) as

(a) 1, 2

(b) 2, 1

(c) 1, 1

(d) 2, 2

Which series of hydrogen atom's spectrum does not lie in infrared region ?

If the refractive indices of crown glass for red, yellow and violet colours are 1.5140, 1.5170 and 1.5318 respectively and for flint glass these are 1.6434, 1.6499 and 1.6852 respectively, then the dispersive powers for crown and flint glass are respectively

(a) 0.034 and 0.064

(b) 0.064 and 0.034

(c) 1.00 and 0.064

(d) 0.034 and 1.0

The transistor are usually made of:

The magnetic flux linked with a coil, in webers, is given by the equations  ∅ =  Then the magnitude of induced e.m.f. at t = 2 second will be

(a) 2 volt

(b) 4 volt

(c) 8 volt

(d) 16 volt

When we remove polyester or woollen clothes in dark, we can see a spark and hear a crackling sound. Which of the following is responsible for it?

In a coaxial, straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero:

1. Outside the cable.
2. Inside the inner conductor.
3. Inside the outer conductor.
4. In between the tow conductors.

Of the following about capacitive reactance which is correct?

To deposit one gm equivalent of an element at an electrode, the quantity of electricity needed is

(a) One ampere

(b) 96000 amperes

(c) 96500 farads

(d) 96500 coulombs