1
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Blocks of masses m, 2m, 4m and 8m are arranged in a line on a frictionless floor. Another block of mass m, moving with speed v along the same line (see figure) collides with mass m in perfectly inelastic manner. All the subsequent collisions are also perfectly inelastic. By the time the last block of mass 8m starts moving the total energy loss is p% of the original energy. Value of 'p' is close to : JEE Main 2020 (Online) 4th September Morning Slot Physics - Center of Mass and Collision Question 70 English
A
37
B
77
C
87
D
94
2
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
For a transverse wave travelling along a straight line, the distance between two peaks (crests) is 5 m, while the distance between one crest and one trough is 1.5 m. The possible wavelengths (in m) of the are :
A
1, 3, 5, .....
B
$${1 \over 1},{1 \over 3},{1 \over 5},$$ .....
C
1, 2, 3, .....
D
$${1 \over 2},{1 \over 4},{1 \over 6},$$
3
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will be seen on the galvanometer G attached across the coil? JEE Main 2020 (Online) 4th September Morning Slot Physics - Electromagnetic Induction Question 87 English
Three positions shown describe :
(a) the magnet's entry
(b) magnet is completely inside and
(c) magnet's exit.
A
JEE Main 2020 (Online) 4th September Morning Slot Physics - Electromagnetic Induction Question 87 English Option 1
B
JEE Main 2020 (Online) 4th September Morning Slot Physics - Electromagnetic Induction Question 87 English Option 2
C
JEE Main 2020 (Online) 4th September Morning Slot Physics - Electromagnetic Induction Question 87 English Option 3
D
JEE Main 2020 (Online) 4th September Morning Slot Physics - Electromagnetic Induction Question 87 English Option 4
4
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A wire A, bent in the shape of an arc of a circle, carrying a current of 2 A and having radius 2 cm and another wire B, also bent in the shape of arc of a circle, carrying a current of 3 A and having radius of 4 cm, are placed as shown in the figure. The ratio of the magnetic fields due to the wires A and B at the common centre O is : JEE Main 2020 (Online) 4th September Morning Slot Physics - Magnetic Effect of Current Question 147 English
A
4 : 6
B
6 : 4
C
2 : 5
D
6 : 5
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