JEE Main 2019 (Online) 12th January Evening Slot | Heat and Thermodynamics Question 294 | Physics

An ideal gas is enclosed in a cylinder at pressure of 2 atm and temperature 300 K. The mean time between two successive collisions is 6 $$ \times $$ 10^–8 s. If the pressure is doubled and temperature is increased to 500 K, the mean time between two successive collisions will be close to

0.5 $$ \times $$ 10^$$-$$8 s

4 $$ \times $$ 10^$$-$$8 s

3 $$ \times $$ 10^$$-$$6 s

2 $$ \times $$ 10^$$-$$7 s

JEE Main 2019 (Online) 12th January Morning Slot

MCQ (Single Correct Answer)

-1

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 295 English

JEE Main 2019 (Online) 12th January Morning Slot Physics - Heat and Thermodynamics Question 295 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