- 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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The counting rate observed from a radioactive source at t = 0 second was 1600 counts per second and at t = 8 seconds it was 100 counts per second. The counting rate observed, as counts per second at t = 6 seconds, will be
|
(a) 400 |
(b) 300 |
(c) 200 |
(d) 150 |
Assertion : At 0 K Germanium is a superconductor.
Reason : At 0 K Germanium offers zero resistance.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Continuous spectrum is not due to
|
(a) Hydrogen flame |
(b) Electric bulb |
|
(c) Kerosene oil lamp flame |
(d) Candle flame |
An arc of a circle of radius R subtends an angle
at the centre. It carries a current i. The magnetic field at the centre will be
|
(a) |
(b) |
(c) |
(d) |
Magnetic induction is a
|
(a) Scalar quantity |
(b) Vector quantity |
(c) Both (a) and (b) |
(d) None of the above |
$\text{p}=\text{p}_0\sin(\text{kx}-\omega\text{t})$
$\text{p}=\text{p}_0\sin\text{kx}\cos\omega\text{t}$
$\text{p}=\text{p}_0\cos\text{kx}\sin\omega\text{t}$
$\text{p}=\sum\text{p}_{0\text{n}}\sin(\text{k}_\text{n}\text{x}-\omega_\text{n}\text{t}).$