JEE Main 2021 (Online) 20th July Evening Shift | Properties of Matter Question 80 | Physics

JEE Main 2021 (Online) 20th July Evening Shift

MCQ (Single Correct Answer)

-1

Two small drops of mercury each of radius R coalesce to form a single large drop. The ratio of total surface energy before and after the change is :

$${2^{{1 \over 3}}}:1$$

$$1:{2^{{1 \over 3}}}$$

2 : 1

1 : 2

JEE Main 2021 (Online) 20th July Morning Shift

MCQ (Single Correct Answer)

-1

The value of tension in a long thin metal wire has been changed from T₁ to T₂. The lengths of the metal wire at two different values of tension T₁ and T₂ are l₁ and l₂ respectively. The actual length of the metal wire is :

$${{{l_1} + {l_2}} \over 2}$$

$$\sqrt {{T_1}{T_2}{l_1}{l_2}} $$

$${{{T_1}{l_2} - {T_2}{l_1}} \over {{T_1} - {T_2}}}$$

$${{{T_1}{l_1} - {T_2}{l_2}} \over {{T_1} - {T_2}}}$$

JEE Main 2021 (Online) 17th March Evening Shift

MCQ (Single Correct Answer)

-1

An object is located at 2 km beneath the surface of the water. If the fractional compression $${{\Delta V} \over V}$$ is 1.36%, the ratio of hydraulic stress to the corresponding hydraulic strain will be ____________. [Given : density of water is 1000 kgm^$$-$$3 and g = 9.8 ms^$$-$$2]

1.44 $$\times$$ 10⁷ Nm^$$-$$2

1.44 $$\times$$ 10⁹ Nm^$$-$$2

1.96 $$\times$$ 10⁷ Nm^$$-$$2

2.26 $$\times$$ 10⁹ Nm^$$-$$2

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

When two soap bubbles of radii a and b (b > a) coalesce, the radius of curvature of common surface is :

$${{b - a} \over {ab}}$$

$${{a + b} \over {ab}}$$

$${{ab} \over {a + b}}$$

$${{ab} \over {b - a}}$$