Semiconductor Electronics : Materials Devices and Simple Circuits — Physics STD 12 Science — Question

A 10 μF capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt. The capacitance of second capacitor is

(a) 10 μF

(b) 20 μF

(c) 30 μF

(d) 15 μF

The angle of dip is the angle

(a) Between the vertical component of earth's magnetic field and magnetic meridian

(b) Between the vertical component of earth's magnetic field and geographical meridian

(c) Between the earth's magnetic field direction and horizontal direction

(d) Between the magnetic meridian and the geographical meridian

Evidence for the expanding universe is given by _______ of light spectrum received from them.

In Boolean algebra A.B=Y implies the:

For the stability of radiated nucleus:

What is the value of capacitance of a capacitor if it has a charge of 9C and voltage of 5V?

An electric bulb marked 40 W - 200 V is used in a circuit of supply voltage 100 V. Now its power is:

A cell of internal resistance 1.5Ω and of e.m.f. 1.5 volt balances 500 cm on a potentiometer wire. If a wire of 15 Ω  is connected between the balance point and the cell, then the balance point will shift

(a) To zero

(b) By 500 cm

(c) By 750 cm

(d) None of the above

A transmitter supplies 9 kW to the aerial when unmodulated. The power radiated when modulated to 40% is

(a) 5 kW

(b) 9.72 kW

(c) 10 kW

(d) 12 kW