Which particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field
|
(a) |
(b) Electron |
(c) Proton |
(d) |
(a) 
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A point object is placed at a distance of 10 cm and its real image is formed at a distance of 20 cm from a concave mirror. If the object is moved by 0.1 cm towards the mirror, the image will shift by about
|
(a) 0.4 cm away from the mirror |
(b) 0.4 cm towards the mirror |
|
(c) 0.8 cm away from the mirror |
(d) 0.8 cm towards the mirror |
Assertion : The whole charge of a conductor cannot be transferred to another isolated conductor.
Reason : The total transfer of charge from one to another is not possible.
|
(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 magnetic flux through a circuit of resistance R changes by an amount ∆∅ in time ∆t, Then the total quantity of electric charge Q, which passing during this time through any point of the circuit is given by
|
(a) Q = |
(b) Q = |
(c) Q = |
(d) Q = |
A ray of light travelling inside a rectangular glass block of refractive index 
is incident on the glass–air surface at an angle of incidence of 45°. The refractive index of air is 1. Under these conditions the ray
|
(a) Will emerge into the air without any deviation |
|
(b) Will be reflected back into the glass |
|
(c) Will be absorbed |
|
(d) Will emerge into the air with an angle of refraction equal to 90° |
If in a photoelectric experiment, the wavelength of incident radiation is reduced from 6000 Å to 4000 Å then
|
(a) Stopping potential will decrease |
|
(b) Stopping potential will increase |
|
(c) Kinetic energy of emitted electrons will decrease |
|
(d) The value of work function will decrease |
A conducting ring of radius 1 meter is placed in an uniform magnetic field B of 0.01Telsa oscillating with frequency 100Hz with its plane at right angles to B. What will be the induced electric field
|
(a) π volt/m |
(b) 2 volt/m |
(c) 10 volt/m |
(d) 62 volt/m |
