- Athe distance between the light source and the metal
- Bintensity of incident light
- ✓the nature of the metal and its surface
- Dthe intensity of emiting light
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When a radioactive substance emits an a -particle, its position in the periodic table is lowered by
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(a) One place |
(b) Two places |
(c) Three places |
(d) Four places |
The binding energies per nucleon for a deuteron and an α- particle are x1 and x2 respectively. What will be the energy Q released in the reaction
|
(a) 4 |
(b) 4 |
(c) 2( |
(d) 2 |
A wire carrying current i is shaped as shown. Section AB is a quarter circle of radius r. The magnetic field is directed

|
(a) At an angle π/4 to the plane of the paper |
|
(b) Perpendicular to the plane of the paper and directed in to the paper |
|
(c) Along the bisector of the angle ACB towards AB |
|
(d) Along the bisector of the angle ACB away from AB |
Which of the following element was discovered by study of Fraunhofer lines
|
(a) Hydrogen |
(b) Oxygen |
(c) Helium |
(d) Ozone |
The internal resistance of a cell of e.m.f. 12V is 5 . It is connected across an unknown resistance. Voltage across the cell, when a current of 60 A is drawn from it, is
|
(a) 15 V |
(b) 12 V |
(c) 9 V |
(d) 6 V |