1
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
$${{ab} \over {b - a}}$$
2
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
3
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
$${{5} \over 200}$$%
4
JEE Main 2021 (Online) 26th February Evening Shift
+4
-1
The length of metallic wire is l1 when tension in it is T1. It is l2 when the tension is T2. The original length of the wire will be :
A
$${{{T_1}{l_1} - {T_2}{l_2}} \over {{T_2} - {T_1}}}$$
B
$${{{l_1} + {l_2}} \over 2}$$
C
$${{{T_2}{l_1} + {T_1}{l_2}} \over {{T_1} + {T_2}}}$$
D
$${{{T_2}{l_1} - {T_1}{l_2}} \over {{T_2} - {T_1}}}$$
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