1
JEE Main 2021 (Online) 25th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Match List - I with List - II :

List I List II
(a) h (Planck's constant) (i) $$[ML{T^{ - 1}}]$$
(b) E (kinetic energy) (ii) $$[M{L^2}{T^{ - 1}}]$$
(c) V (electric potential) (iii) $$[M{L^2}{T^{ - 2}}]$$
(d) P (linear momentum) (iv) $$[M{L^2}{I^{ - 1}}{T^{ - 3}}]$$


Choose the correct answer from the options given below :
A
(a) $$ \to $$ (ii), (b) $$ \to $$ (iii), (c) $$ \to $$ (iv), (d) $$ \to $$ (i)
B
(a) $$ \to $$ (i), (b) $$ \to $$ (ii), (c) $$ \to $$ (iv), (d) $$ \to $$ (iii)
C
(a) $$ \to $$ (iii), (b) $$ \to $$ (ii), (c) $$ \to $$ (iv), (d) $$ \to $$ (i)
D
(a) $$ \to $$ (iii), (b) $$ \to $$ (iv), (c) $$ \to $$ (ii), (d) $$ \to $$ (i)
2
JEE Main 2021 (Online) 25th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Two satellites A and B of masses 200 kg and 400 kg are revolving round the earth at height of 600 km and 1600 km respectively.

If TA and TB are the time periods of A and B respectively then the value of TB $$-$$ TA :

JEE Main 2021 (Online) 25th February Morning Shift Physics - Gravitation Question 130 English
[Given : radius of earth = 6400 km, mass of earth = 6 $$\times$$ 1024 kg]
A
1.33 $$\times$$ 103 s
B
4.24 $$\times$$ 102 s
C
3.33 $$\times$$ 102 s
D
4.24 $$\times$$ 103 s
3
JEE Main 2021 (Online) 25th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Two coherent light sources having intensity in the ratio 2x produce an interference pattern. The ratio $${{{I_{\max }} - {I_{\min }}} \over {{I_{\max }} + {I_{\min }}}}$$ will be :
A
$${{2\sqrt {2x} } \over {2x + 1}}$$
B
$${{2\sqrt {2x} } \over {x + 1}}$$
C
$${{\sqrt {2x} } \over {x + 1}}$$
D
$${{\sqrt {2x} } \over {2x + 1}}$$
4
JEE Main 2021 (Online) 25th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
An engine of a train, moving with uniform acceleration, passes the signal-post with velocity u and the last compartment with velocity v. The velocity with which middle point of the train passes the signal post is :
A
$${{u + v} \over 2}$$
B
$$\sqrt {{{{v^2} - {u^2}} \over 2}} $$
C
$${{v - u} \over 2}$$
D
$$\sqrt {{{{v^2} + {u^2}} \over 2}} $$
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