
- A$0.1$ mA
- B10 mA
- C$0.1$ A
- Dnone of these

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When a ray of light passes from a denser to a rarer medium, some part of it gets ....... into the denser medium:
The energy stored in the condenser is
|
(a) QV |
(b) |
(c) |
(d) |
The alloys constantan and manganin are used to make standard resistance due to they have
|
(a) Low resistivity |
(b) High resistivity |
|
(c) Low temperature coefficient of resistance |
(d) Both (b) and (c) |
The splitting of line into groups under the effect of electric or magnetic field is called
|
(a) Zeeman's effect |
(b) Bohr's effect |
|
(c) Heisenberg's effect |
(d) Magnetic effect |
The field due to a long straight wire carrying a current I is proportional to
|
(a) I |
(b) |
(c) |
(d) 1/I |
The wavelength of
line for an element of atomic number 43 is
. Then the wavelength of
line for an element of atomic number 29 is
|
(a) |
(b) |
(c) |
(d) |
Which one of the following is true in photoelectric emission
|
(a) Photoelectric current is directly proportional to the amplitude of light of a given frequency |
|
(b) Photoelectric current is directly proportional to the intensity of light of a given frequency at moderate intensities |
|
(c) Above the threshold frequency, the maximum K.E. of photoelectrons is inversely proportional to the frequency of incident light |
|
(d) The threshold frequency depends upon the wavelength of incident light |