What will be the angular width of central maxima in Fraunhoffer diffraction when light of wavelength 6000 
is used and slit width is 12
|
(a) 2 rad |
(b) 3 rad |
(c) 1 rad |
(d) 8 rad |
(c) 1 rad
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While using an electric bulb, the reflection for street lighting should be from
|
(a) Concave mirror |
(b) Convex mirror |
(d) Parabolic mirror |
(d) Parabolic mirror |
A solenoid of 1.5 metre length and 4.0 cm diameter posses 10 turn per cm. A current of 5 ampere is flowing through it. The magnetic induction at axis inside the solenoid is
|
(a) 2π |
(b) 2π |
(c) 4π |
(d) 2π |
A particle moving in a magnetic field increases its velocity, then its radius of the circle
|
(a) Decreases |
(b) Increases |
(c) Remains the same |
(d) Becomes half |
When white light passes through the achromatic combination of prisms, then what is observed
|
(a) Only deviation |
(b) Only dispersion |
|
(c) Deviation and dispersion |
(d) None of the above |
The critical angle of a medium with respect to air is 45°. The refractive index of medium is
|
(a) 1.41 |
(b) 1.2 |
(c) 1.5 |
(d) 2 |
A nucleus decays by 
emission followed by a gamma emission. If the atomic and mass numbers of the parent nucleus are Z and A respectively, the corresponding numbers for the daughter nucleus are respectively.
|
(a) Z - 1 and A - 1 |
(b) Z + 1 and A |
(c) Z - 1 and A |
(d) Z + 1 and A - 1 |
