JEE Main 2023 (Online) 29th January Morning Shift | Properties of Matter Question 81 | Physics

Surface tension of a soap bubble is $$2.0 \times 10^{-2} \mathrm{Nm}^{-1}$$. Work done to increase the radius of soap bubble from $$3.5 \mathrm{~cm}$$ to $$7 \mathrm{~cm}$$ will be:

Take $$\left[\pi=\frac{22}{7}\right]$$

$$18 .48 \times 10^{-4} \mathrm{~J}$$

$$5.76 \times 10^{-4} \mathrm{~J}$$

$$0.72 \times 10^{-4} \mathrm{~J}$$

$$9.24 \times 10^{-4} \mathrm{~J}$$

JEE Main 2023 (Online) 29th January Morning Shift

MCQ (Single Correct Answer)

-1

A bicycle tyre is filled with air having pressure of $$270 ~\mathrm{kPa}$$ at $$27^{\circ} \mathrm{C}$$. The approximate pressure of the air in the tyre when the temperature increases to $$36^{\circ} \mathrm{C}$$ is

262 kPa

360 kPa

270 kPa

278 kPa

JEE Main 2023 (Online) 25th January Morning Shift

MCQ (Single Correct Answer)

-1

Match List I with List II

	List I		List II
A.	Surface tension	I.	$$\mathrm{kg~m^{-1}~s^{-1}}$$
B.	Pressure	II.	$$\mathrm{kg~ms^{-1}}$$
C.	Viscosity	III.	$$\mathrm{kg~m^{-1}~s^{-2}}$$
D.	Impulse	IV.	$$\mathrm{kg~s^{-2}}$$

Choose the correct answer from the options given below :

A-IV, B-III, C-I, D-II

A-IV, B-III, C-II, D-I

A-I, B-I, C-III, D-IV

A-III, B-IV, C-I, D-II

JEE Main 2023 (Online) 25th January Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

A bowl filled with very hot soup cools from 98$$^\circ$$C to 86$$^\circ$$C in 2 minutes when the room temperature is 22$$^\circ$$C. How long it will take to cool from 75$$^\circ$$C to 69$$^\circ$$C?

2 minutes

0.5 minute

1.4 minutes

1 minute

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