Current Electricity — Physics STD 12 Science — Question

A 10 pF capacitor is connected to a 50 V battery. How much electrostatic energy is stored in the capacitor

(a) 1.25

(b) 2.5

(c) 3.5

(d) 4.5

 Which among the following has a frequency range of 500 kHz to 1000 MHz?

A source emits light of wavelength 4700Å, 5400 Å and 6500 Å. The light passes through red glass before being tested by a spectrometer. Which wavelength is seen in the spectrum

(a) 6500 Å

(b) 5400 Å

(c) 4700 Å

(d) All the above

Let Q and W denote the amount of heat given to an ideal gas and the work done by it in an adiabatic process.

1. Q = 0
2. W = 0
3. Q = W
4. Q ≠ W

The distance between the plates of a parallel plate capacitor is d. A metal plate of thickness d/2 is placed between the plates. The capacitance would then be

(a) Unchanged

(b) Halved

(c) Zero

(d) Doubled

The two ends of a spring are displaced along the length of the spring. All displacement have equal magnitudes. In which case or cases the tension or compression in the spring will have a maximum magnitude?

1. The right end is displaced towards right and the left end towards left.
2. Both ends are displaced towards right.
3. Both ends are displaced towards left.
4. The right end is displaced towards left and the left end towards right.

The size of the nucleus is approximately :

The SI unit of capacitance is:

When moving electron comes closer to other stationary electron, then its kinetic energy and potential energy respectively _____ and _____.