1
JEE Main 2021 (Online) 26th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
The temperature of equal masses of three different liquids x, y and z are 10$$^\circ$$C, 20$$^\circ$$C and 30$$^\circ$$C respectively. The temperature of mixture when x is mixed with y is 16$$^\circ$$C and that when y is mixed with z is 26$$^\circ$$C. The temperature of mixture when x and z are mixed will be :
A
28.32$$^\circ$$C
B
25.62$$^\circ$$C
C
23.84$$^\circ$$C
D
20.28$$^\circ$$C
2
JEE Main 2021 (Online) 26th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
A cylindrical container of volume 4.0 $$\times$$ 10$$-$$3 m3 contains one mole of hydrogen and two moles of carbon dioxide. Assume the temperature of the mixture is 400 K. The pressure of the mixture of gases is :

[Take gas constant as 8.3 J mol$$-$$1 K$$-$$1]
A
249 $$\times$$ 101 Pa
B
24.9 $$\times$$ 103 Pa
C
24.9 $$\times$$ 105 Pa
D
24.9 Pa
3
JEE Main 2021 (Online) 26th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
A refrigerator consumes an average 35W power to operate between temperature $$-$$10$$^\circ$$C to 25$$^\circ$$C. If there is no loss of energy then how much average heat per second does it transfer?
A
263 J/s
B
298 J/s
C
350 J/s
D
35 J/s
4
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
An electric appliance supplies 6000 J/min heat to the system. If the system delivers a power of 90W. How long it would take to increase the internal energy by 2.5 $$\times$$ 103 J ?
A
2.5 $$\times$$ 102 s
B
4.1 $$\times$$ 101 s
C
2.4 $$\times$$ 103 s
D
2.5 $$\times$$ 101 s
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