1
JEE Main 2023 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1

A body cools in 7 minutes from $$60^{\circ} \mathrm{C}$$ to $$40^{\circ} \mathrm{C}$$. The temperature of the surrounding is $$10^{\circ} \mathrm{C}$$. The temperature of the body after the next 7 minutes will be:

A
$$34^{\circ} \mathrm{C}$$
B
$$28^{\circ} \mathrm{C}$$
C
$$32^{\circ} \mathrm{C}$$
D
$$30^{\circ} \mathrm{C}$$
2
JEE Main 2023 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1

The ratio of speed of sound in hydrogen gas to the speed of sound in oxygen gas at the same temperature is:

A
$$1: 1$$
B
$$1: 2$$
C
$$1: 4$$
D
$$4: 1$$
3
JEE Main 2023 (Online) 6th April Morning Shift
MCQ (Single Correct Answer)
+4
-1

A source supplies heat to a system at the rate of $$1000 \mathrm{~W}$$. If the system performs work at a rate of $$200 \mathrm{~W}$$. The rate at which internal energy of the system increases is

A
600 W
B
1200 W
C
500 W
D
800 W
4
JEE Main 2023 (Online) 6th April Morning Shift
MCQ (Single Correct Answer)
+4
-1

The number of air molecules per cm$$^3$$ increased from $$3\times10^{19}$$ to $$12\times10^{19}$$. The ratio of collision frequency of air molecules before and after the increase in number respectively is:

A
1.25
B
0.25
C
0.50
D
0.75
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