1
JEE Main 2019 (Online) 8th April Morning Slot
+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
B
C
D
2
JEE Main 2019 (Online) 8th April Morning Slot
+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
+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
+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
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
EXAM MAP
Joint Entrance Examination