1
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
The mass of a hydrogen molecule is 3.32 $$\times$$ 10-27 kg. If 1023 hydrogen molecules strike, per second, a fixed wall of area 2 cm2 at an angle of 45o to the normal, and rebound elastically with a speed of 103 m/s, then the pressure on the wall is nearly:
A
2.35 $$\times$$ 103 N m-2
B
4.70 $$\times$$ 103 N m-2
C
2.35 $$\times$$ 102 N m-2
D
4.70 $$\times$$ 102 N m-2
2
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
A proton of mass m collides elastically with a particle of unknown mass at rest. After the collision, the proton and the unknown particle are seen moving at an angle of 90o with respect to each other. The mass of unknown particle is :
A
$${m \over 2}$$
B
m
C
$${m \over {\sqrt 3 }}$$
D
2 m
3
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Two particles A and B of equal mass M are moving with the same speed $$\upsilon$$ as shown in the figure. They collide completely inelastically and move as a single particle C. The angle $$\theta$$ that the path of C makes with the X-axis is given by :

A
tan $$\theta$$ = $${{\sqrt 3 + \sqrt 2 } \over {1 - \sqrt 2 }}$$
B
tan $$\theta$$ = $${{\sqrt 3 - \sqrt 2 } \over {1 - \sqrt 2 }}$$
C
tan $$\theta$$ = $${{1 - \sqrt 2 } \over {\sqrt 2 \left( {1 + \sqrt 3 } \right)}}$$
D
tan $$\theta$$ = $${{1 - \sqrt 3 } \over {1 + \sqrt 2 }}$$
4
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
A neutron moving with a speed ‘v’ makes a head on collision with a stationary hydrogen atom in ground state. The minimum kinetic energy of the neutron for which inelastic collision will take place is :
A
10.2 eV
B
16.8 eV
C
12.1 eV
D
20.4 eV
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