Explanation:
Statements B,C and D are correct whereas the statement "Fringes are due to limited portion of the wave front" is incorrect.
Interference fringes are formed due to the whole portion of wave front.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A long straight wire carries an electric current of 2A. The magnetic induction at a perpendicular distance of 5m from the wire is
|
(a) 4 |
(b) 8 |
(c) 12 |
(d) 16 |
Two particles A and B of masses 
and 
respectively and having the same charge are moving in a plane. A uniform magnetic field exists perpendicular to this plane. The speeds of the particles are 
and 
respectively, and the trajectories are as shown in the figure. Then
|
(a) |
(b) |
|
(c) |
(d) |
A condenser of capacity 
is charged to a potential 
. The electrostatic energy stored in it is 
. It is connected to another uncharged condenser of capacity 
in parallel. The energy dissipated in the process is
|
(a) |
(b) |
(c) |
(d) |
A polariser is used to
|
(a) Reduce intensity of light |
(b) Produce polarised light |
|
(c) Increase intensity of light |
(d) Produce unpolarised light |
The error in measuring the current with a tangent galvanometer is minimum when the deflection is about
|
(a) 0o |
(b) 30o |
(c) 45o |
(d) 60o |
How does the red shift confirms that the universe is expanding
|
(a) Due to Wien's law |
(b) Due to Stefan's law |
|
(c) Due to Kirchhoff's law |
(d) Due to Doppler's effect |
In the figure given the value of X resistance will be, when the p.d. between B and D is zero
|
(a) 4 ohm |
(b) 6 ohm |
(c) 8 ohm |
(d) 9 ohm |
A capacitor of capacitance 6μF is charged upto 100 volt. The energy stored in the capacitor is
|
(a) 0.6 Joule |
(b) 0.06 Joule |
(c) 0.03 Joule |
(d) 0.3 Joule |
