1
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Two Carnot engines A and B operate in series such that engine A absorbs heat at T1 and rejects heat to a sink at temperature T. Engine B absorbs half of the heat rejected by Engine A and rejects heat to the sink at T3. When workdone in both the cases is equal, to value of T is :
A
$${2 \over 3}{T_1} + {3 \over 2}{T_3}$$
B
$${1 \over 3}{T_1} + {2 \over 3}{T_3}$$
C
$${3 \over 2}{T_1} + {1 \over 3}{T_3}$$
D
$${2 \over 3}{T_1} + {1 \over 3}{T_3}$$
2
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Find the truth table for the function Y of A and B represented in the following figure.

JEE Main 2021 (Online) 27th July Evening Shift Physics - Semiconductor Question 80 English
A
JEE Main 2021 (Online) 27th July Evening Shift Physics - Semiconductor Question 80 English Option 1
B
JEE Main 2021 (Online) 27th July Evening Shift Physics - Semiconductor Question 80 English Option 2
C
JEE Main 2021 (Online) 27th July Evening Shift Physics - Semiconductor Question 80 English Option 3
D
JEE Main 2021 (Online) 27th July Evening Shift Physics - Semiconductor Question 80 English Option 4
3
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Figure A and B shown to long straight wires of circular cross-section (a and b with a < b), carrying current I which is uniformly distributed across the cross-section. The magnitude of magnetic field B varies with radius r and can be represented as :

JEE Main 2021 (Online) 27th July Evening Shift Physics - Magnetic Effect of Current Question 83 English
A
JEE Main 2021 (Online) 27th July Evening Shift Physics - Magnetic Effect of Current Question 83 English Option 1
B
JEE Main 2021 (Online) 27th July Evening Shift Physics - Magnetic Effect of Current Question 83 English Option 2
C
JEE Main 2021 (Online) 27th July Evening Shift Physics - Magnetic Effect of Current Question 83 English Option 3
D
JEE Main 2021 (Online) 27th July Evening Shift Physics - Magnetic Effect of Current Question 83 English Option 4
4
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Two identical particles of mass 1 kg each go round a circle of radius R, under the action of their mutual gravitational attraction. The angular speed of each particle is :
A
$$\sqrt {{G \over {2{R^3}}}} $$
B
$${1 \over 2}\sqrt {{G \over {{R^3}}}} $$
C
$${1 \over {2R}}\sqrt {{1 \over G}} $$
D
$${{2G} \over {{R^3}}}$$
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