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

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

Read the assertion and reason carefully to mark the correct option out of the options given below:

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.

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Assertion : Blue star is at high temperature than red star.

Reason : Wein's displacement law states that T∝(1/λ_m).

Read the assertion and reason carefully to mark the correct option out of the options given below:

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.

Read the assertion and reason carefully to mark the correct option out of the options given below:

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.

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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.

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.