- AMetals increases and of semiconductor decreases.
- BSemeconductors increases and metals decreases.
- CIn both metals and semiconductors increases.
- DIn both metal and semiconductor decreases.
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The sodium nucleus
contains
|
(a) 11 electrons |
(b) 12 protons |
(c) 23 protons |
(d) 12 neutrons |
Two resistances are joined in parallel whose resultant is ohm. One of the resistance wire is broken and the effective resistance becomes 2Ω. Then the resistance in ohm of the wire that got broken was
|
(a) 3/5 |
(b) 2 |
(c) 6/5 |
(d) 3 |
A mass m = 20 g has a charge q = 30 mC. It moves with a velocity of 20 m/s and enters a region of electric field of 80 N/C in the same direction as the velocity of the mass. The velocity of the mass after 3 seconds in this region is
|
(a) 80 m/s |
(b) 56 m/s |
(c) 44 m/s |
(d) 40 m/s |
Find the equivalent resistance between the points a and b
|
(a) 2 W |
(b) 4 W |
(c) 8 W |
(d) 16 W |
The core of a transformer is laminated to reduce energy losses due to
|
(a) Eddy currents |
(b) Hysteresis |
|
(c) Resistance in winding |
(d) None of these |
Radio waves and visible light in vacuum have
|
(a) Same velocity but different wavelength |
|
(b) Continuous emission spectrum |
|
(c) Band absorption spectrum |
|
(d) Line emission spectrum |