1
JEE Main 2023 (Online) 24th January Morning Shift
+4
-1 A 100 m long wire having cross-sectional area $$\mathrm{6.25\times10^{-4}~m^2}$$ and Young's modulus is $$\mathrm{10^{10}~Nm^{-2}}$$ is subjected to a load of 250 N, then the elongation in the wire will be :

A
$$\mathrm{6.25\times10^{-6}~m}$$
B
$$\mathrm{4\times10^{-3}~m}$$
C
$$\mathrm{4\times10^{-4}~m}$$
D
$$\mathrm{6.25\times10^{-3}~m}$$
2
JEE Main 2022 (Online) 29th July Morning Shift
+4
-1 Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Clothes containing oil or grease stains cannot be cleaned by water wash.

Reason (R): Because the angle of contact between the oil/grease and water is obtuse.

In the light of the above statements, choose the correct answer from the option given below.

A
Both (A) and (R) are true and (R) is the correct explanation of (A)
B
Both (A) and (R) are true but (R) is not the correct explanation of (A)
C
(A) is true but (R) is false
D
(A) is false but (R) is true
3
JEE Main 2022 (Online) 29th July Morning Shift
+4
-1 If the length of a wire is made double and radius is halved of its respective values. Then, the Young's modulus of the material of the wire will :

A
remain same
B
become 8 times its initial value
C
become $$\frac{1}{4}$$ of its initial value
D
become 4 times its initial value
4
JEE Main 2022 (Online) 28th July Evening Shift
+4
-1 A pressure-pump has a horizontal tube of cross sectional area $$10 \mathrm{~cm}^{2}$$ for the outflow of water at a speed of $$20 \mathrm{~m} / \mathrm{s}$$. The force exerted on the vertical wall just in front of the tube which stops water horizontally flowing out of the tube, is :

[given: density of water $$=1000 \mathrm{~kg} / \mathrm{m}^{3}$$]

A
300 N
B
500 N
C
250 N
D
400 N
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