- AThere are no free electrons at 0 K.
- BThere are no free electrons at any temperature.
- CThe number of free electrons increases with pressure.
- DThe number of fre electrons is more than that in a conductor.
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Two electric lamps of 40 watt each are connected in parallel. The power consumed by the combination will be
|
(a) 20 watt |
(b) 60 watt
|
(c) 80 watt |
(d) 100 watt |
A uniform wire of 16 Ω is made into the form of a square. Two opposite corners of the square are connected by a wire of resistance 16 Ω. The effective resistance between the other two opposite corners is
|
(a) 32 Ω |
(b) 20 Ω |
(c) 8 Ω |
(d) 4 Ω |
The ionisation potential of H-atom is 13.6 V. When it is excited from ground state by monochromatic radiations of 970.6
the number of emission lines will be (according to Bohr’s theory)
|
(a) 10 |
(b) 8 |
(c) 6 |
(d) 4 |
Ionization potential of hydrogen atom is 13.6 V.
Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. The spectral lines emitted by hydrogen atoms according to Bohr's theory will be
|
(a) One |
(b) Two |
(c) Three |
(d) Four |
As the temperature of hot junction of a thermo‑couple is increased (while cold junction is at constant temperature), the thermo e.m.f.
|
(a) Increases uniformly at constant rate |
|
(b) Increases slowly in the beginning and more rapidly at higher temperatures |
|
(c) Increases more rapidly in the beginning but less rapidly at higher temperatures |
|
(d) In minimum at neutral temperature |
A charge of 40 μC is given to a capacitor having capacitance C = 10 μF. The stored energy in ergs is
|
(a) 80 |
(b) 800 |
(c) 80 |
(d) 8000 |