1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
A force F = 20 + 10y acts on a particle in y-direction where F is in newton and y in meter. Work done by this force to move the particle from y = 0 to y = 1 m is :
A
5 J
B
25 J
C
20 J
D
30 J
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
Ionized hydrogen atoms and $$\alpha $$-particles with same momenta enters perpendicular to a constant magnetic field, B. The ratio of their radii of their paths rH : r$$\alpha $$ will be :
A
1 : 2
B
4 : 1
C
1 : 4
D
2 : 1
3
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
A disc of radius 2 m and mass 100 kg rolls on a horizontal floor. Its centre of mass has speed of 20 cm/s. How much work is needed to stop it?
A
1 J
B
2 J
C
3 J
D
30 kJ
4
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
Body A of mass 4m moving with speed u collides with another body B of mass 2 m, at rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is :
A
$${5 \over 9}$$
B
$${4 \over 9}$$
C
$${8 \over 9}$$
D
$${1 \over 9}$$