1
NDA General Ability 16 April 2023
+4
-1.33
Two forces of 5⋅0 N each are acting on a point mass. If the angle between the forces is 60°, then the net force acting on the point mass has magnitude close to :
A
8⋅6 N
B
4⋅3 N
C
50 N
D
6⋅7 N
2
NDA General Ability 16 April 2023
+4
-1.33

A rectangle ABCD is kept in front of a concave mirror of focal length f with its corners A and B being, respectively, at distances 2f and 3f from the mirror with AB along the principal axis as shown in the figure. It forms an image A'B'C'D' in front of the mirror. What is the ratio of B'C' to A'D'?

A
1
B
2
C
$\frac{1}{2}$
D
$\frac{2}{3}$
3
NDA General Ability 16 April 2023
+4
-1.33

Shown in the figure are two plane mirrors XY and YZ (XY ⊥ YZ) joined at their edge. Also shown is a light ray falling on one of the mirrors and reflected back parallel to its original path as a result of this arrangement. The two mirrors are now rotated by an angle θ to their new position X'YZ', as shown. As a result the new reflected ray is at an angle α from the original reflected ray. Then :

A
α = 0
B
α = θ
C
α = 2θ
D
α = 4θ
4
NDA General Ability 16 April 2023
+4
-1.33
A railway wagon (open at the top) of mass M1 is moving with speed v1 along a straight track. As a result of rain, after some time it gets partially filled with water so that the mass of the wagon becomes M2 and speed becomes v2. Taking the rain to be falling vertically and the water stationery inside the wagon, the relation between the two speeds v1 and v2 is :
A
v1 = v2
B
$\frac{1}{2}$M1$v^2_1$ < $\frac{1}{2}$ M2$v^2_2$
C
M1v1 = M2v2
D
M1v1 < M2v2
EXAM MAP
Medical
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