
- AMagnetic field
- ✓Static electric field
- CInduced electric field
- DGravitational field

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Which of the following phenomena suggests the presence of electron energy levels in atoms
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(a) Radio active decay |
(b) Isotopes |
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(c) Spectral lines |
(d) a -particles scattering |
Assertion : Two bulbs of same wattage, one having a carbon filament and the other having a metallic filament are connected in series. Metallic bulbs will glow more brightly than carbon filament bulb.
Reason : Carbon is a semiconductor.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A coil of 40 W resistance has 100 turns and radius 6 mm is connected to ammeter of resistance of 160 ohms. Coil is placed perpendicular to the magnetic field. When coil is taken out of the field, 32 m C charge flows through it. The intensity of magnetic field will be
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(a) 6.55 T |
(b) 5.66 T |
(c) 0.655 T |
(d) 0.566 T |
Einstein's photoelectric equation states that
. In this equation
refers to
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(a) Kinetic energy of all the emitted electrons |
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(b) Mean kinetic energy of the emitted electrons |
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(c) Maximum kinetic energy of the emitted electrons |
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(d) Minimum kinetic energy of the emitted electrons |
If the light moving in a straight line bends by a small but fixed angle, it may be a case of:
In the interference pattern, energy is
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(a) Created at the position of maxima |
(b) Destroyed at the position of minima |
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(c) Conserved but is redistributed |
(d) None of the above |