1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L + $$l$$). The elastic potential energy stored in the extended wire is :
A
Mgl
B
mgL
C
$${1 \over 2}$$Mgl
D
$${1 \over 2}$$MgL
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
Two point charges A and B, having charges +Q and – Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes :
A
F
B
$${{16F} \over 9}$$
C
$${{9F} \over {16}}$$
D
$${{4F} \over 3}$$
3
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
4
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