Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Assertion :   Mass of moving photon varies inversely as the wavelength.

Reason     : Energy of the particle = Mass ×

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

The measurement of voltmeter in the following circuit is

(a) 2.4 V

(b) 3.4 V

(c) 4.0 V

(d) 6.0 V

If q is the charge per unit area on the surface of a conductor, then the electric field intensity at a point on the surface is

(a)  normal to surface	(b)  normal to surface
(c)   tangential to surface	(d)   tangential to surface

The figure here gives the electric field of an EM wave at a certain poiunt and a certain instrant. the wave is transporting energy in the negative z direction. what is tha direction of the magnetic field of the wave at that point and instant.

Which of the following is used as standard for determination of atomic mass unit?

The dimension ML^-1 T^-2 can correspond to:

1. Moment of a force.
2. Surface tension.
3. Modulus of elasticity.
4. Moefficient of viscosity.

A wire elongates by 1.0mm when a load W is hung from it. If this wire goes over a a pulley and two weights W each are hung at the two ends, he eloogation of he wire will be:

1. 0.5m
2. 1.0mm
3. 2.0mm
4. 4.0mm.

Those atoms which have the same atomic number but different mass number are called :

A p-n junction diode cannot be used:

A cell of emf 6 V and resistance 0.5 ohm is short circuited.  The current in the cell is

(a) 3 amp

(b) 12 amp

(c) 24 amp

(d) 6 amp