1
JEE Main 2021 (Online) 17th March Evening Shift
+4
-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]
A
1.44 $$\times$$ 107 Nm$$-$$2
B
1.44 $$\times$$ 109 Nm$$-$$2
C
1.96 $$\times$$ 107 Nm$$-$$2
D
2.26 $$\times$$ 109 Nm$$-$$2
2
JEE Main 2021 (Online) 17th March Morning Shift
+4
-1
When two soap bubbles of radii a and b (b > a) coalesce, the radius of curvature of common surface is :
A
$${{b - a} \over {ab}}$$
B
$${{a + b} \over {ab}}$$
C
$${{ab} \over {a + b}}$$
D
$${{ab} \over {b - a}}$$
3
JEE Main 2021 (Online) 16th March Evening Shift
+4
-1
What will be the nature of flow of water from a circular tap, when its flow rate increased from 0.18 L/min to 0.48 L/min? The radius of the tap and viscosity of water are 0.5 cm and 10$$-$$3 Pa s, respectively. (Density of water : 103 kg/m3)
A
B
C
Remains turbulent flow
D
4
JEE Main 2021 (Online) 16th March Morning Shift
+4
-1
The pressure acting on a submarine is 3 $$\times$$ 105 Pa at a certain depth. If the depth is doubled, the percentage increase in the pressure acting on the submarine would be :

(Assume that atmospheric pressure is 1 $$\times$$ 105 Pa density of water is 103 kg m$$-$$3, g = 10 ms$$-$$2)
A
$${{200} \over 5}$$%
B
$${{200} \over 3}$$%
C
$${{3} \over 200}$$%
D
$${{5} \over 200}$$%
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