The pointer of a dead-beat galvanometer gives a steady deflection because
|
(a) Eddy currents are produced in the conducting frame over which the coil is wound |
|
(b) Its magnet is very strong |
|
(c) Its pointer is very light |
|
(d) Its frame is made of abonite |
(a) Eddy currents are produced in the conducting frame over which the coil is wound
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When N-type of semiconductor is heated
|
(a) Number of electrons increases while that of holes decreases |
|
(b) Number of holes increases while that of electrons decreases |
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(c) Number of electrons and holes remains same |
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(d) Number of electrons and holes increases equally |
Which radiation in sunlight, causes heating effect
|
(a) Ultraviolet |
(b) Infrared |
(c) Visible light |
(d) All of these |
The expression for thermo e.m.f. in a thermocouple is given by the relation E = 40 θ - 
, where θ is the temperature difference of two junctions. For this, the neutral temperature will be
|
(a) 100℃ |
(b) 200℃ |
(c) 300℃ |
(d) 400℃ |
In a parallel beam of white light is incident on a converging lens, the colour which is brought to focus nearest to the lens is
|
(a) Violet |
(b) Red |
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(c) The mean colour |
(d) All the colours together |
In a PN-junction
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(a) P and N both are at same potential |
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(b) High potential at N side and low potential at P side |
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(c) High potential at P side and low potential at N side |
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(d) Low potential at N side and zero potential at P side |
$\overrightarrow{\text{F}}\times\overrightarrow{\text{a}}$
$\overrightarrow{\text{v}}\times\overrightarrow{\text{r}}$
$\overrightarrow{\text{a}}\times\overrightarrow{\text{r}}$
$\overrightarrow{\text{F}}\times\overrightarrow{\text{r}}$