1
JEE Main 2021 (Online) 16th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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
MCQ (Single Correct Answer)
+4
-1
Change Language
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
MCQ (Single Correct Answer)
+4
-1
Change Language
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
MCQ (Single Correct Answer)
+4
-1
Change Language
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
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
CBSE
Class 12