Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

If in a photoelectric experiment, the wavelength of incident radiation is reduced from 6000 Å to 4000 Å then

(a) Stopping potential will decrease

(b) Stopping potential will increase

(c) Kinetic energy of emitted electrons will decrease

(d) The value of work function will decrease

The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true

(a) Its kinetic energy increases and its potential and total energies decrease

(b) Its kinetic energy decreases, potential energy increases and its total energy remains the same

(c) Its kinetic and total energies decrease and its potential energy increases

(d) Its kinetic, potential and total energies decreases

The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to

(a)

(b)

(c) 1/

(d) 1/V

The phenomenon by which stars recedes from each other is explained by:

The S.I. unit of electric flux is

(a) Weber	(b) Newton per coulomb
(c) Volt  × metre	(d) Joule per coulomb

The capacitor offers zero resistance to.

The variation of anode current in a triode corresponding to a change in grid potential at three different values of the plate potential is shown in the diagram. The mutual conductance of the triode is

(a) 2.5 m mho

(b) 5.0 m mho

(c) 7.5 m mho

(d) 10.0 m mho

In the figure a capacitor is filled with dielectrics. The resultant capacitance is

(a)

(b)

(c) []

(d) None of these

 Maxwell in his famous equations of electromagnetism introduced the concept of:

Two bulbs are working in parallel order. Bulb A is brighter than bulb B. If  and   are their resistance respectively then

(a)

(b)

(c)

(d) None of these