- APermittivity.
- BDielectric constant.
- CElectric susceptibility.
- DDielectric strength.
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In the Young's double slit experiment, the spacing between two slits is 0.1 mm. If the screen is kept at a distance of 1.0 m from the slits and the wavelength of light is 5000 Å, then the fringe width is
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(a) 1.0 cm |
(b) 1.5 cm |
(c) 0.5 cm |
(d) 2.0 cm |
Three equal resistors connected in series across a source of e.m.f. together dissipate 10 watt. If the same resistors are connected in parallel across the same e.m.f., then the power dissipated will be
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(a) 10 watt |
(b) 30 watt |
(c) 10/3 watt |
(d) 90 watt |
Assertion : A parallel plate capacitor is connected across battery through a key. A dielectric slab of constant K is introduced between the plates. The energy which is stored becomes K times.
Reason : The surface density of charge on the plate remains constant or unchanged.
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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. |
When 2 amperes current is passed through a tangent galvanometer, it gives a deflection of 30o. For 60o deflection, the current must be
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(a) 1 amp |
(b) 2 |
(c) 4 amp |
(d) 6 amp |
A sodium atom is in one of the states labeled 'Lowest excited levels'. It remains in that state for an average time of 10–8 sec, before it makes a transition back to a ground state. What is the uncertainty in energy of that excited state
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(a) 6.56 × 10–8 eV |
(b) 2 × 10–8 eV |
(c) 10–8 eV |
(d) 8 × 10–8 eV |