1
JEE Main 2022 (Online) 26th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A water drop of radius $$1 \mathrm{~cm}$$ is broken into 729 equal droplets. If surface tension of water is 75 dyne/ $$\mathrm{cm}$$, then the gain in surface energy upto first decimal place will be :

(Given $$\pi=3.14$$ )

A
$$8.5 \times 10^{-4} \mathrm{~J}$$
B
$$8.2 \times 10^{-4} \mathrm{~J}$$
C
$$7.5 \times 10^{-4} \mathrm{~J}$$
D
$$5.3 \times 10^{-4} \mathrm{~J}$$
2
JEE Main 2022 (Online) 26th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The percentage decrease in the weight of a rocket, when taken to a height of $$32 \mathrm{~km}$$ above the surface of earth will, be :

$$($$ Radius of earth $$=6400 \mathrm{~km})$$

A
1%
B
3%
C
4%
D
0.5%
3
JEE Main 2022 (Online) 26th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

As per the given figure, two blocks each of mass $$250 \mathrm{~g}$$ are connected to a spring of spring constant $$2 \,\mathrm{Nm}^{-1}$$. If both are given velocity $$v$$ in opposite directions, then maximum elongation of the spring is :

JEE Main 2022 (Online) 26th July Morning Shift Physics - Work Power & Energy Question 62 English

A
$$\frac{v}{2 \sqrt{2}}$$
B
$$\frac{v}{2}$$
C
$$\frac{v}{4}$$
D
$$ \frac{v}{\sqrt{2}} $$
4
JEE Main 2022 (Online) 26th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A monkey of mass $$50 \mathrm{~kg}$$ climbs on a rope which can withstand the tension (T) of $$350 \mathrm{~N}$$. If monkey initially climbs down with an acceleration of $$4 \mathrm{~m} / \mathrm{s}^{2}$$ and then climbs up with an acceleration of $$5 \mathrm{~m} / \mathrm{s}^{2}$$. Choose the correct option $$\left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right)$$.

A
$$T=700 \mathrm{~N}$$ while climbing upward
B
$$T=350 \mathrm{~N}$$ while going downward
C
Rope will break while climbing upward
D
Rope will break while going downward
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