Light is incident normally on a diffraction grating through which the first order diffraction is seen at 32o. The second order diffraction will be seen at
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(a) 48o |
|
(b) 64o |
|
(c) 80o
|
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(d) There is no second order diffraction in this case |
(d) There is no second order diffraction in this case
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If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be
|
(a) 9 : 4 |
(b) 4 : 3 |
(c) 3 : 8 |
(d) 3 : 2 |
Some equipotential surfaces of the magnetic scalar potential are shown in the figure. Magnetic field at a point in the region is
|
(a) |
(b) 2 |
(c) 0.5 |
(d) None of these |
A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be 2 seconds. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be 2 seconds. Then the angle of dip is
|
(a) 0o |
(b) 30o |
(c) 45o |
(d) 90o |
For germanium crystal, the forbidden energy gap in joules is
|
(a) 1.12 |
(b) 1.76 |
(c) 1.6 |
(d) Zero |
A charge particle is free to move in an electric field. It will travel
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(a) Always along a line of force |
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(b) Along a line of force, if its initial velocity is zero |
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(c) Along a line of force, if it has some initial velocity in the direction of an acute angle with the line of force |
|
(d) None of the above |
A beam of light is converging towards a point I on a screen. A plane glass plate whose thickness in the direction of the beam = t, refractive index = μ, is introduced in the path of the beam. The convergence point is shifted by
|
(a) |
(b) |
(c) |
(d) |
In a transformer the primary has 500 turns and secondary has 50 turns. 100 volts are applied to the primary coil, the voltage developed in the secondary will be
|
(a) 1 V |
(b) 10 V |
(c) 1000 V |
(d) 10000 V |
