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

If a rod has resistance 4 W and if rod is turned as half cycle then the resistance along diameter

(a) 1.56 W

(b) 2.44 W

(c) 4 W

(d) 2 W

The dual nature of light is exhibited by

(a) Photoelectric effect	(b) Refraction and interference
(c) Diffraction and reflection	(d) Diffraction and photoelectric effect

Forward biasing is that in which applied voltage:

White light may be considered to be a mixture of waves with l ranging between 3900 Å and 7800 Å. An oil film of thickness 10,000 Å is examined normally by reflected light. If m = 1.4, then the film appears bright for

(a) 4308 Å, 5091 Å, 6222 Å	(b) 4000 Å, 5091 Å, 5600 Å
(c) 4667 Å, 6222 Å, 7000 Å	(d) 4000 Å, 4667 Å, 5600 Å, 7000Å

The magnetic compass is not useful for navigation near the magnetic poles, since:

In the disintegration series  the values of Z and A respectively will be

(a) 92, 236

(b) 88, 230

(c) 90, 234

(d) 91, 234

Binding energy per nucleon for C¹² is 7.68 MeV and for C¹³ is 7.74MeV. The energy required to remove a neutron from C¹³ is:

The graph gives the magnitude B(t) of a uniform magnetic field that exists throughout a conducting loop, perpendicular to the plane of the loop. Rank the five regions of the graph according to the magnitude of the emf induced in the loop, greatest first

(a) b > (d = e) < (a = c)	(b) b > (d = e) > (a = c)
(c) b < d < e < c < a	(d) b > (a = c) > (d = e)

A metal rod moves at a constant velocity in a direction perpendicular to its length. A constant uniform magnetic field exists in space in a direction perpendicular to the rod as well as its velocity. Select the correct statement(s) from the following

(a) The entire rod is at the same electric potential

(b) There is an electric field in the rod

(c) The electric potential is highest at the centre of the rod and decreases towards its ends

(d) The electric potential is lowest at the centre of the rod and increases towards its ends

The device, which can be used to detect whether an object is charged, is: