1
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
A particle of mass 20 g is released with an initial velocity 5 m/s along the curve from the point A, as shown in the figure. The point A is at height h from point B. The particle slides along the frictionless surface. when the particle reaches point b, its angular momentum about O will be :
(Take g = 10 m/s2)

JEE Main 2019 (Online) 12th January Evening Slot Physics - Work Power & Energy Question 89 English
A
6 kg-m2/s
B
8 kg-m2/s
C
2 kg-m2/s
D
3 kg-m2/s
2
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
An alpha-particle of mass m suffers 1-dimensional elastic collision with a nucleus at rest of unknown mass. It is scattered directly backwards losing, 64% of its initial kinetic energy. The mass of the nucleus is
A
2 m
B
4 m
C
1.5 m
D
3.5 m
3
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
For the given cyclic process CAB as shown for a gas, the work done is :

JEE Main 2019 (Online) 12th January Morning Slot Physics - Work Power & Energy Question 91 English
A
1 J
B
10 J
C
5 J
D
30 J
4
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
There is a uniform spherically symmetric surface charge density at a distance R0 from the origin. The charge distribution is initially at rest and starts expanding because of mutual repulsion. The figure that represents best the speed V (R(t)) of the distribution as a function of its instantaneous radius R (t) is :
A
JEE Main 2019 (Online) 12th January Morning Slot Physics - Work Power & Energy Question 90 English Option 1
B
JEE Main 2019 (Online) 12th January Morning Slot Physics - Work Power & Energy Question 90 English Option 2
C
JEE Main 2019 (Online) 12th January Morning Slot Physics - Work Power & Energy Question 90 English Option 3
D
JEE Main 2019 (Online) 12th January Morning Slot Physics - Work Power & Energy Question 90 English Option 4
JEE Main Subjects
EXAM MAP
Joint Entrance Examination
JEE MainJEE AdvancedWB JEEBITSAT
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN