1
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
$${{5} \over 200}$$%
2
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
$${{{T_2}{l_1} - {T_1}{l_2}} \over {{T_2} - {T_1}}}$$
3
JEE Main 2021 (Online) 26th February Morning Shift
+4
-1
A large number of water drops, each of radius r, combine to have a drop of radius R. If the surface tension is T and mechanical equivalent of heat is J, the rise in heat energy per unit volume will be :
A
$${{2T} \over J}\left( {{1 \over r} - {1 \over R}} \right)$$
B
$${{3T} \over J}\left( {{1 \over r} - {1 \over R}} \right)$$
C
$${{3T} \over rJ}$$
D
$${{2T} \over rJ}$$
4
JEE Main 2021 (Online) 26th February Morning Shift
+4
-1
The normal density of a material is $$\rho$$ and its bulk modulus of elasticity is K. The magnitude of increase in density of material, when a pressure P is applied uniformly on all sides, will be :
A
$${{\rho K} \over P}$$
B
$${{PK} \over \rho }$$
C
$${{\rho P} \over K}$$
D
$${K \over {\rho P}}$$
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
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Calculus
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