1
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-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)
A
JEE Main 2019 (Online) 8th April Morning Slot Physics - Heat and Thermodynamics Question 227 English Option 1
B
JEE Main 2019 (Online) 8th April Morning Slot Physics - Heat and Thermodynamics Question 227 English Option 2
C
JEE Main 2019 (Online) 8th April Morning Slot Physics - Heat and Thermodynamics Question 227 English Option 3
D
JEE Main 2019 (Online) 8th April Morning Slot Physics - Heat and Thermodynamics Question 227 English Option 4
2
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-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)
A
35 g
B
130 g
C
20 g
D
150 g
3
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-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
A
0.5 $$ \times $$ 10$$-$$8 s
B
4 $$ \times $$ 10$$-$$8 s
C
3 $$ \times $$ 10$$-$$6 s
D
2 $$ \times $$ 10$$-$$7 s
4
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
An ideal gas occupies a volume of 2m3 at a pressure of 3 $$ \times $$ 106 Pa. The energy of the gas is :
A
6 $$ \times $$ 104 J
B
9$$ \times $$ 106 J
C
3 $$ \times $$ 102 J
D
108 J
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