MCQ
Light from a tungsten filament lamp gives:
- AAbsorption spectrum
- BEmission spectrum
- CAtomic spectrum
- DDiscontinuous spectrum
Explanation:
Light from a tungsten filament lamp has an emission spectrum which is continuous in nature.
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Assertion : The colour of the green flower seen through red glass appears to be dark.
Reason : Red glass transmits only red light.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
The cathode rays have particle nature because of the fact that
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(a) They can propagate in vacuum |
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(b) They are deflected by electric and magnetic fields |
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(c) They produced fluorescence |
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(d) They cast shadows |
The distance of the eye-lens from the retina is x. For a normal eye, the maximum focal length of the eye-lens:
$\vec{\text{r}}.\vec{\text{F}}=0$ and $\vec{\text{F}}.\vec{\tau}=0$
$\vec{\text{r}}.\vec{\tau}=0$ but $\vec{\text{F}}.\vec{\tau}\neq0$
$\vec{\text{r}}.\vec{\tau}\neq0$ but $\vec{\text{F}}.\vec{\tau}=0$
$\vec{\text{r}}.\vec{\tau}\neq0$ and $\vec{\text{F}}.\vec{\tau}\neq0$
A semiconductor dopped with a donor impurity is
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(a) P-type |
(b) N-type |
(c) NPN type |
(d) PNP type |