Explanation:
In insulators, the electrons are very tightly bound to the nucleus. At a room temperature, thermal energy is not enough to push electrons into conduction band. The energy band gap is very high. Thus the conduction band is empty and the valence band is filled with electrons.
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A parallel plate capacitor has circular plates of 0.08m radius and 1.0 
separation. If a P.D. of 100 volt is applied, the charge will be
|
(a) 1.8 |
(b) 1.8 |
(c) 1.8 |
(d) None of these |
A charged particle of mass m and charge q travels on a circular path of radius r that is perpendicular to a magnetic field B. The time taken by the particle to complete one revolution is
|
(a) |
(b) |
(c) |
(d) |
Magnetic flux ∅ (in weber) linked with a closed circuit of resistance 10 ohm varies with time t (in seconds) as ∅ = 
The induced electromotive force in the circuit at t = 0.2 sec. is
|
(a) 0.4 volts |
(b) – 0.4 volts |
(c) – 2.0 volts |
(d) 2.0 volts |
A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature 36 cm. The distance of the object from the mirror is
|
(a) 5 cm |
(b) 12 cm |
(c) 10 cm |
(d) 20 cm |
The curve between current (i) and potential difference (V) for a photo cell will be
|
(a)
|
(b)
|
(c)
|
(d)
|
If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same
|
(a) Energy |
(b) Momentum |
(c) Velocity |
(d) Angular momentum |
