- ADielectrics.
- BPolarisation.
- CElectric field.
- DElectric dipole moment.
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Intrinsic semiconductor is electrically neutral. Extrinsic semiconductor having large number of current carriers would be
|
(a) Positively charged |
|
(b) Negatively charged |
|
(c) Positively charged or negatively charged depending upon the type of impurity that has been added |
|
(d) Electrically neutral |
Threshold wavelength for photoelectric effect on sodium is 5000 Å. Its work function is
|
(a) 15 J |
(b) 16 |
(c) 4 |
(d) 4 |
A metallic sphere has a charge of 10μC. A unit negative charge is brought from A to B both 100 cm away from the sphere but A being east of it while B being on west. The net work done is
|
(a) Zero |
(b) 2/10 joule |
(c) -2/10 joule |
(d) -1/10 joule |
In the figure, current through the 3 Ω resistor is 0.8 ampere, then potential drop through 4 Ω resistor is

|
(a) 9.6 V |
(b) 2.6 V |
(c) 4.8 V |
(d) 1.2 V |
Kα wavelength emitted by an atom of atomic number Z = 11 is λ. Find the atomic number for an atom that emits Kα radiation with wavelength 4l
|
(a) Z = 6 |
(b) Z = 4 |
(c) Z = 11 |
(d) Z = 44 |
A current of 16 ampere flows through molten NaCl for 10 minute. The amount of metallic sodium that appears at the negative electrode would be
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(a) 0.23 gm |
(b) 1.15 gm |
(c) 2.3 gm |
(d) 11.5 gm |