MCQ
The distinction between conductors, insulators and semiconductors is largely concerned with:
- ATheir ability to conduct current
- BThe type of crystal lattice
- CBinding energy of their electrons
- DRelative widths of their energy gaps
Explanation:
According to band theory, distinction between conductors, insulators and semiconductors is based on relative width of energy gaps between valence band and conduction band.
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When the length and area of cross-section both are doubled, then its resistance
|
(a) Will become half |
(b) Will be doubled |
|
(c) Will remain the same |
(d) Will become four times |
The half life (T) and the disintegration constant (λ) of a radioactive substance are related as
|
(a) λT = 1 |
(b) λT = 0.693 |
(c) |
(d) |
How much energy in kilowatt hour is consumed in operating ten 50 watt bulbs for 10 hours per day in a month (30 days).
|
(a) 1500 |
(b) 5,000 |
(c) 15 |
(d) 150 |