Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

For the given combination of gates, if the logic states of inputs A, B, C are as follows A = B = C = 0 and A = B = 1, C = 0 then the logic states of output D are

(a) 0, 0

(b) 0, 1

(c) 1, 0

(d) 1, 1

Potential energy of a charged conductor is :

In hydrogen spectrum the wavelength of  line is 656 nm whereas in the spectrum of a distant galaxy,  line wavelength is 706 nm. Estimated speed of the galaxy with respect to earth is

(a) 2

(b) 2

(c) 2

(d) 2

As the electron in Bohr orbit of Hydrogen atom passes from state n = 2 to n = 1, the kinetic energy K and potential energy U change as

(a) K two-fold, U four-fold	(b) K four-fold, U two-fold
(c) K four-fold, U also four-fold	(d) K two-fold, U also two-fold

The direction of electric field is from:

The variation of wavelength λ  of the   line with atomic number Z of the target is shown by the following curve of

(a) A

(b) B

(c) C

(d) None of these

Two identical short bar magnets, each having magnetic moment of 10 Am², are arranged such that their axial lines are perpendicular to each other and their centres be along the same straight line in a horizontal plane. If the distance between their centres is 0.2 m, the resultant magnetic induction at a point  midway between them  is ( 

(a)  Tesla

(b)  Tesla

(c)  Tesla

(d)  Tesla

A steady potential difference of 100V produces heat at a constant rate in a resistor. The alternating voltage which will produce half the heating effect in the same resister will be.

The toroid of radius 10 cm has 100 turns. If a current of 0.1 ampere is flowing in it, then the value of the magnetic field on the axis of the toroid will be: