In a P-type semiconductor
|
(a) Current is mainly carried by holes |
|
(b) Current is mainly carried by electrons |
|
(c) The material is always positively charged |
|
(d) Doping is done by pentavalent material |
(a) Current is mainly carried by holes
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In the Young’s double slit experiment, for which colour the fringe width is least
|
(a) Red |
(b) Green |
(c) Blue |
(d) Yellow |
A negatively charged plate has charge density of 2 
. The initial distance of an electron which is moving toward plate, cannot strike the plate, if it is having energy of 200 eV
|
(a) 1.77 mm |
(b) 3.51 mm |
(c) 1.77 cm |
(d) 3.51 cm |
A group of bright and faint stars is called
|
(a) Galaxy |
(b) Comet |
(c) Black hole |
(d) Constellation |
For a given thermocouple, the thermo e.m.f. can be
|
(a) Zero |
(b) Positive |
(c) Negative |
(d) All of the above |
A diffraction is obtained by using a beam of red light. What will happen if the red light is replaced by the blue light
|
(a) Bands will narrower and crowd full together |
|
(b) Bands become broader and further apart |
|
(c) No change will take place |
|
(d) Bands disappear |
de-Broglie wavelength of a body of mass 1 kg moving with velocity of 2000 m/s is
|
(a) 3.32 × 10–27 Å |
(b) 1.5 × 107 Å |
(c) 0.55 × 10–22 Å |
(d) None of these |
Drift velocity 
varies with the intensity of electric field as per the relation
|
(a) |
(b) |
(c) |
(d) |
Compton effect shows that
|
(a) X-rays are waves |
(b) X-rays have high energy |
|
(c) X-rays can penetrate matter |
(d) Photons have momentum |
