1
JEE Main 2023 (Online) 24th January Evening Shift
+4
-1

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A : Steel is used in the construction of buildings and bridges.

Reason R : Steel is more elastic and its elastic limit is high.

In the light of above statements, choose the most appropriate answer from the options given below

A
Both A and R are correct and R is the correct explanation of A
B
A is correct but R is not correct
C
Both A and R are correct but R is NOT the correct explanation of A
D
A is not correct but R is correct
2
JEE Main 2023 (Online) 24th January Evening Shift
+4
-1

The frequency ($$\nu$$) of an oscillating liquid drop may depend upon radius ($$r$$) of the drop, density ($$\rho$$) of liquid and the surface tension (s) of the liquid as $$\nu=r^a\rho^b s^c$$. The values of a, b and c respectively are

A
$$\left( {{3 \over 2},{1 \over 2}, - {1 \over 2}} \right)$$
B
$$\left( { - {3 \over 2}, - {1 \over 2},{1 \over 2}} \right)$$
C
$$\left( {{3 \over 2}, - {1 \over 2},{1 \over 2}} \right)$$
D
$$\left( { - {3 \over 2},{1 \over 2},{1 \over 2}} \right)$$
3
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
$$\mathrm{6.25\times10^{-3}~m}$$
4
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
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