JEE Main 2019 (Online) 8th April Morning Slot | Heat and Thermodynamics Question 226 | Physics

JEE Main 2019 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

Two identical breakers A and B contain equal volumes of two different liquids at 60°C each and left to cool down. Liquid in A has density of 8 × 102 kg/m³ and specific heat of 2000 J kg^–1 K^–1 while liquid in B has density of 103 kg m^–3 and specific heat of 4000 J kg^–1 K^–1. Which of the following best describes their temperature versus time graph schematically? (assume the emissivity of both the beakers to be the same)

JEE Main 2019 (Online) 8th April Morning Slot Physics - Heat and Thermodynamics Question 227 English Option 1

JEE Main 2019 (Online) 8th April Morning Slot Physics - Heat and Thermodynamics Question 227 English Option 2

JEE Main 2019 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

A thermally insulated vessel contains 150g of water at 0°C. Then the air from the vessel is pumped out adiabatically. A fraction of water turns into ice and the rest evaporates at 0°C itself. The mass of evaporated water will be closest to : (Latent heat of vaporization of water = 2.10 × 10⁶ J kg^–1 and Latent heat of Fusion of water = 3.36 × 10⁵ J kg^–1)

35 g

130 g

20 g

150 g

JEE Main 2019 (Online) 12th January Evening Slot

MCQ (Single Correct Answer)

-1

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

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