MCQ
At temperature 0K, the germanium behaves as a/ an:
- AConductor.
- BInsulator.
- CSuper-conductor.
- DFerromagnetic.
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Davission and Germer experiment proved
|
(a) Wave nature of light |
(b) Particle nature of light |
|
(c) Both (a) and (b) |
(d) Neither (a) nor (b) |
The thermo e.m.f. of a thermocouple varies with the temperature θ of the hot junction as
in volts where the ratio a/b is 700℃. If the cold junction is kept at 0℃, then the neutral temperature is
|
(a) 700℃ |
|
(b) 350℃ |
|
(c) 1400℃ |
|
(d) No neutral temperature is possible for this thermocouple |
Why are red coloured lights are used in traffic signals to stop the vehicles?