JEE Main 2023 (Online) 31st January Evening Shift | Properties of Matter Question 73 | Physics

JEE Main 2023 (Online) 31st January Evening Shift

MCQ (Single Correct Answer)

-1

Under the same load, wire A having length $5.0 \mathrm{~m}$ and cross section $2.5 \times 10^{-5} \mathrm{~m}^{2}$ stretches uniformly by the same amount as another wire B of length $6.0 \mathrm{~m}$ and a cross section of $3.0 \times 10^{-5}$ $\mathrm{m}^{2}$ stretches. The ratio of the Young's modulus of wire A to that of wire $B$ will be :

$1: 2$

$1: 4$

$1: 1$

$1: 10$

JEE Main 2023 (Online) 31st January Morning Shift

MCQ (Single Correct Answer)

-1

If 1000 droplets of water of surface tension $$0.07 \mathrm{~N} / \mathrm{m}$$, having same radius $$1 \mathrm{~mm}$$ each, combine to from a single drop. In the process the released surface energy is :-

$$\left( {\mathrm{Take}\,\pi = {{22} \over 7}} \right)$$

$$7 .92 \times 10^{-4} \mathrm{~J}$$

$$7 .92 \times 10^{-6} \mathrm{~J}$$

$$8 .8 \times 10^{-5} \mathrm{~J}$$

$$9 .68 \times 10^{-4} \mathrm{~J}$$

JEE Main 2023 (Online) 30th January Evening Shift

MCQ (Single Correct Answer)

-1

A force is applied to a steel wire 'A', rigidly clamped at one end. As a result elongation in the wire is $0.2 \mathrm{~mm}$. If same force is applied to another steel wire ' $\mathrm{B}$ ' of double the length and a diameter $2.4$ times that of the wire ' $\mathrm{A}$ ', the elongation in the wire ' $\mathrm{B}$ ' will be (wires having uniform circular cross sections)

$6 .9 \times 10^{-2} \mathrm{~mm}$

$6.06 \times 10^{-2} \mathrm{~mm}$

$2.77 \times 10^{-2} \mathrm{~mm}$

$3.0 \times 10^{-2} \mathrm{~mm}$

JEE Main 2023 (Online) 30th January Morning Shift

MCQ (Single Correct Answer)

-1

The height of liquid column raised in a capillary tube of certain radius when dipped in liquid A vertically is, $$5 \mathrm{~cm}$$. If the tube is dipped in a similar manner in another liquid $$\mathrm{B}$$ of surface tension and density double the values of liquid $$\mathrm{A}$$, the height of liquid column raised in liquid $$\mathrm{B}$$ would be __________ m.

0.05

0.20

0.5

0.10

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