The minimum energy required to remove an electron is called
|
(a) Stopping potential |
(b) Kinetic energy |
(c) Work function |
(d) None of these |
(c) Work function
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Period of revolution increases in the order of
|
(a) Saturn, Uranus, Venus |
(b) Mars, Saturn, Pluto |
|
(c) Mercury, Neptune, Mars |
(d) Mars, Jupiter, Venus |
The radius of curvature for a convex lens is 40 cm, for each surface. Its refractive index is 1.5. The focal length will be
|
(a) 40 cm |
(b) 20 cm |
(c) 80 cm |
(d) 30 cm |
Refractive index for a material for infrared light is
|
(a) Equal to that of ultraviolet light |
|
(b) Less than for ultraviolet light |
|
(c) Equal to that for red colour of light |
|
(d) Greater than that for ultraviolet light |
Which of the following statement is not the true
|
(a) While taking reading of tangent galvanometer, the plane of the coil must be set at right angles to the earth’s magnetic meridian |
|
(b) A short magnet is used in a tangent galvanometer since a long magnet would be heavy and may not easily move |
|
(c) Measurements with the tangent galvanometer will be more accurate when the deflection is around 45o |
|
(d) A tangent galvanometer can not be used in the polar region |
In the Bohr model of the hydrogen atom, let R, v and E represent the radius of the orbit, the speed of electron and the total energy of the electron respectively. Which of the following quantity is proportional to the quantum number n
|
(a) R/E |
(b) E/v |
(c) RE |
(d) vR |