JEE Main 2019 (Online) 12th January Morning Slot | Heat and Thermodynamics Question 346 | Physics

For the given cyclic process CAB as shown for a gas, the work done is :

JEE Main 2019 (Online) 12th January Morning Slot Physics - Heat and Thermodynamics Question 346 English

JEE Main 2019 (Online) 12th January Morning Slot Physics - Heat and Thermodynamics Question 346 English

1 J

10 J

5 J

30 J

JEE Main 2019 (Online) 12th January Morning Slot

MCQ (Single Correct Answer)

-1

A cylinder of radius R is surrounded by a cylindrical shell of inner radius R and outer radius 2R. The thermal conductivity of the material of the inner cylinder is K₁ and the of the outer cylinder is K₂. Assuming no loss of heat, the effective thermal conductivity of the system for heat flowing along the length of the cylinder is :

K₁ + K₂

$${{{K_1} + 3{K_2}} \over 4}$$

$${{{K_1} + {K_2}} \over 2}$$

$${{2{K_1} + 3{K_2}} \over 5}$$

JEE Main 2019 (Online) 12th January Morning Slot

MCQ (Single Correct Answer)

-1

An ideal gas occupies a volume of 2m³ at a pressure of 3 $$ \times $$ 10⁶ Pa. The energy of the gas is :

6 $$ \times $$ 10⁴ J

9$$ \times $$ 10⁶ J

3 $$ \times $$ 10² J

10⁸ J

JEE Main 2019 (Online) 11th January Evening Slot

MCQ (Single Correct Answer)

-1

In a process, temperature and volume of one mole of an ideal monoatomic gas are varied according to the relation VT = K, where K is a constant. In this process the temperature of the gas is increased by $$\Delta $$T. The amount of heat absorbed by gas is (R is gas constant) :

$${1 \over 2}$$ KR$$\Delta $$T

$${1 \over 2}$$ R$$\Delta $$T

$${3 \over 2}$$ R$$\Delta $$T

$${2K \over 3}$$ $$\Delta $$T

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