WB JEE 2019 | Heat and Thermodynamics Question 27 | Physics

WB JEE 2019

MCQ (Single Correct Answer)

-0.25

Two black bodies A and B have equal surface areas are maintained at temperatures 27$$^\circ$$C and 177$$^\circ$$C respectively. What will be the ratio of the thermal energy radiated per second by A to that by B?

4 : 9

2 : 3

16 : 81

27 : 177

WB JEE 2019

MCQ (Single Correct Answer)

-0.25

What will be the molar specific heat at constant volume of an ideal gas consisting of rigid diatomic molecules?

$${3 \over 2}R$$

$${5 \over 2}R$$

WB JEE 2019

MCQ (Single Correct Answer)

-0.25

Consider the given diagram. An ideal gas is contained in a chamber (left) of volume V and is at an absolute temperature T. It is allowed to rush freely into the right chamber of volume V which is initially vacuum. The whole system is thermally isolated. What will be the final temperature of the equilibrium has been attained?

WB JEE 2019 Physics - Heat and Thermodynamics Question 40 English

WB JEE 2019 Physics - Heat and Thermodynamics Question 40 English

$${T \over 2}$$

$${T \over 4}$$

WB JEE 2019

MCQ (Single Correct Answer)

-0.5

A horizontal fire hose with a nozzle of cross-sectional area $${5 \over {\sqrt {21} }} \times {10^{ - 3}}{m^2}$$ delivers a cubic metre of water in 10s. What will be the maximum possible increase in the temperature of water while it hits a rigid wall (neglecting the effect of gravity)?

$$1^\circ $$C

$$0.1^\circ $$C

$$10^\circ $$C

$$0.01^\circ $$C

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