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Assertion & Reason Test: Thermal Properties of Matter - NEET MCQ


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10 Questions MCQ Test Topic-wise MCQ Tests for NEET - Assertion & Reason Test: Thermal Properties of Matter

Assertion & Reason Test: Thermal Properties of Matter for NEET 2024 is part of Topic-wise MCQ Tests for NEET preparation. The Assertion & Reason Test: Thermal Properties of Matter questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: Thermal Properties of Matter MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Thermal Properties of Matter below.
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Assertion & Reason Test: Thermal Properties of Matter - Question 1
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Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion : A body that is a good radiator is also a good absorber of radiation at a given wavelength.

Reason : According to Kirchhoff's law the absorptivity of a body is equal to its emissivity at a given wavelength.

Detailed Solution for Assertion & Reason Test: Thermal Properties of Matter - Question 1
According to Kirchhoff's law, a = e. or the absorptivity of a body equals its emissivity. A good absorber is a good emitter. As a good absorber is poor reflector, emitting (or radiating) ability of body is oppositely related to its ability to reflect. Therefore good emitter (or radiator) is a poor reflector.
Assertion & Reason Test: Thermal Properties of Matter - Question 2
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Assertion : Temperatures near the sea coast are moderate.

Reason : Water has a high thermal conductivity.

Detailed Solution for Assertion & Reason Test: Thermal Properties of Matter - Question 2
During the day when water is cooler than the land, the wind blows off the water onto the land (as warm air rises and cooler air fills the place). Also at night, the effect is reversed (since the water is usually warmer than the surrounding air on land). Due to this wind flow the temperature near the sea coast remains moderate.
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Assertion & Reason Test: Thermal Properties of Matter - Question 3
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Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion : Bodies radiate heat at all temperatures.

Reason : Rate of radiation of heat is proportional to the fourth power of absolute temperature.

Detailed Solution for Assertion & Reason Test: Thermal Properties of Matter - Question 3
Assertion is false because at absolute zero (0, K), heat is neither radiates nor absorbed. Reason is the statement of Stefan’s law, as E ∝ T4.
Assertion & Reason Test: Thermal Properties of Matter - Question 4
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Assertion :The equivalent thermal conductivity of two plates of same thickness in contact is less than the smaller value of thermal conductivity

Reason: For two plates of equal thickness in contact the equivalent thermal conductivity is given by:
1/K=1/K1+1/K2

 
Detailed Solution for Assertion & Reason Test: Thermal Properties of Matter - Question 4

Assertion & Reason Test: Thermal Properties of Matter - Question 5
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Assertion : If the temperature of a star is doubled then the rate of loss of heat from it becomes 16 times.

Reason : Specific heat varies with temperature.
Detailed Solution for Assertion & Reason Test: Thermal Properties of Matter - Question 5
This is in accordance with the Stefan?s law E∝T4.
Assertion & Reason Test: Thermal Properties of Matter - Question 6
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Assertion : Blue star is at high temperature than red star.

Reason : Wein's displacement law states that T∝(1/λm).
Detailed Solution for Assertion & Reason Test: Thermal Properties of Matter - Question 6

From Wein's displacement law, temperature (T)∝1/λm (where λm is the maximum wavelength). Thus temperature of a body is inversely proportional to the wavelength. Since blue star has smaller wavelength and red star has maximum wavelength, therefore blue star is at higher temperature then red star.

Assertion & Reason Test: Thermal Properties of Matter - Question 7
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Assertion : A brass tumbler feels much colder than a wooden tray on a chilly day.

Reason : The thermal conductivity of brass is less than that of wood.
Detailed Solution for Assertion & Reason Test: Thermal Properties of Matter - Question 7
The thermal conductivity of brass is high i.e., brass is a good conductor of heat. So, when a brass tumbler is touched, heat quickly flows from human body to tumbler. Consequently, the tumbler appears colder, on the other hand wood is a bad conductor. So, heat does not flow from the human body to the wooden tray in this case. Thus it appears comparatively hotter.
Assertion & Reason Test: Thermal Properties of Matter - Question 8
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Assertion : For higher temperature, the peak emission wavelength of a black body shifts to lower wavelengths.

Reason : Peak emission wavelength of a blackbody is proportional to the fourth power of temperature.
Detailed Solution for Assertion & Reason Test: Thermal Properties of Matter - Question 8
According to Wein's law, λmT = constant

Thus peak emission wavelength λm ​∝ 1/T

Hence for higher temperature, peak emission wavelength for a black body shifts to lower wavelength.

Assertion & Reason Test: Thermal Properties of Matter - Question 9
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Assertion : It is hotter over the top of a fire than at the same distance on the sides.

Reason : Air surrounding the fire conducts more heat upwards.
Detailed Solution for Assertion & Reason Test: Thermal Properties of Matter - Question 9
Heat is carried away from a fire sideways mainly by radiations. Above the fire, heat is carried by both radiation and by convection of air. The latter process carries much more heat.
Assertion & Reason Test: Thermal Properties of Matter - Question 10
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Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion : Woolen clothes keep the body warm in winter.

Reason : Air is a bad conductor of heat.
Detailed Solution for Assertion & Reason Test: Thermal Properties of Matter - Question 10
Woolen fibres encloses a large amount of air in them. Both wool and air are the bad conductors of heat and the coefficient of thermal conductivity is small. So, they prevent any loss of heat from our body.
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