$Assertion :$ A tube light emits white light.
$Reason :$ Emission of light in a tube takes place at a very high temperature.
$Assertion :$ A tube light emits white light.
$Reason :$ Emission of light in a tube takes place at a very high temperature.
- [AIIMS 2003]
- A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
- B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
- C
If the Assertion is correct but Reason is incorrect.
- D
If both the Assertion and Reason are incorrect.
Similar Questions
A hollow copper sphere $S$ and a hollow copper cube $ C$ , both of negligible thin walls of same area, are filled with water at $90°C$ and allowed to cool in the same environment. The graph that correctly represents their cooling is
A hollow copper sphere $S$ and a hollow copper cube $ C$ , both of negligible thin walls of same area, are filled with water at $90°C$ and allowed to cool in the same environment. The graph that correctly represents their cooling is
Newton’s law of cooling, holds good only if the temperature difference between the body and the surroundings is
Newton’s law of cooling, holds good only if the temperature difference between the body and the surroundings is
$Assertion :$ Perspiration from human body helps in cooling the body.
$Reason :$ A thin layer of water on the skin enhances its emissivity.
$Assertion :$ Perspiration from human body helps in cooling the body.
$Reason :$ A thin layer of water on the skin enhances its emissivity.
- [AIIMS 2006]
A sphere and a cube of same material and same volume are heated upto same temperature and allowed to cool in the same surroundings. The ratio of the amounts of radiations emitted will be
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A cup of coffee cools from $90^{\circ} \mathrm{C}$ to $80^{\circ} \mathrm{C}$ in $\mathrm{t}$ minutes, when the room temperature is $20^{\circ} \mathrm{C}$. The time taken by a similar cup of coffee to cool from $80^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ at a room temperature same at $20^{\circ} \mathrm{C}$ is :
A cup of coffee cools from $90^{\circ} \mathrm{C}$ to $80^{\circ} \mathrm{C}$ in $\mathrm{t}$ minutes, when the room temperature is $20^{\circ} \mathrm{C}$. The time taken by a similar cup of coffee to cool from $80^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ at a room temperature same at $20^{\circ} \mathrm{C}$ is :
- [NEET 2021]