1
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Choose the correct waveform that can represent the voltage across R of the following circuit, assuming the diode is ideal one :

JEE Main 2021 (Online) 31st August Morning Shift Physics - Semiconductor Question 70 English
A
JEE Main 2021 (Online) 31st August Morning Shift Physics - Semiconductor Question 70 English Option 1
B
JEE Main 2021 (Online) 31st August Morning Shift Physics - Semiconductor Question 70 English Option 2
C
JEE Main 2021 (Online) 31st August Morning Shift Physics - Semiconductor Question 70 English Option 3
D
JEE Main 2021 (Online) 31st August Morning Shift Physics - Semiconductor Question 70 English Option 4
2
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A uniform heavy rod of weight 10 kg ms$$-$$2, cross-sectional area 100 cm2 and length 20 cm is hanging from a fixed support. Young modulus of the material of the rod is 2 $$\times$$ 1011 Nm$$-$$2. Neglecting the lateral contraction, find the elongation of rod due to its own weight.
A
2 $$\times$$ 10$$-$$9 m
B
5 $$\times$$ 10$$-$$8 m
C
4 $$\times$$ 10$$-$$8 m
D
5 $$\times$$ 10$$-$$10 m
3
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Two plane mirrors M1 and M2 are at right angle to each other shown. A point source 'P' is placed at 'a' and '2a' meter away from M1 and M2 respectively. The shortest distance between the images thus formed is : (Take $$\sqrt 5 $$ = 2.3)

JEE Main 2021 (Online) 31st August Morning Shift Physics - Geometrical Optics Question 77 English
A
3a
B
4.6a
C
2.3a
D
2$$\sqrt {10} $$a
4
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Match List - I with List - II.

List - I List - II
(a) Torque (i) MLT$$^{ - 1}$$
(b) Impulse (ii) MT$$^{ - 2}$$
(c) Tension (iii) ML$$^{ 2}$$T$$^{ - 2}$$
(d) Surface Tension (iv) MLT$$^{ - 2}$$


Choose the most appropriate answer from the option given below :
A
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
B
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
C
(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
D
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
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