- AFluorescent lamp
- BIncandescent lamp
- CCFL
- DBoth (A) and (C)
Explanation:
Fluroscent lamp and compact fluroscent lamp works based on the low pressure gas discharge principle.
The glass tube if low pressure gas discharge lamp is filled with noble gas at low pressure and small quantity of mercury.
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Electric field strength due to a point charge of 5μC at a distance of 80 cm from the charge is
|
(a) |
(b) 7 |
(c) 5 |
(d) 4 |
In a double slit arrangement fringes are produced using light of wavelength 4800 Å. One slit is covered by a thin plate of glass of refractive index 1.4 and the other with another glass plate of same thickness but of refractive index 1.7. By doing so the central bright shifts to original fifth bright fringe from centre. Thickness of glass plate is
|
(a) 8 mm |
(b) 6 mm |
(c) 4 mm |
(d) 10 mm |
Two copper balls, each weighing 10g are kept in air 10 cm apart. If one electron from every
atoms is transferred from one ball to the other, the coulomb force between them is (atomic weight of copper is 63.5)
|
(a) 2.0 |
(b) 2.0 |
(c) 2.0 |
(d) 2.0 |
Two like magnetic poles of strength 10 and 40 SI units are separated by a distance 30 cm. The intensity of magnetic field is zero on the line joining them
|
(a) At a point 10 cm from the stronger pole |
|
(b) At a point 20 cm from the stronger pole |
|
(c) At the mid-point |
|
(d) At infinity |