1
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language

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'?

NDA General Ability 16 April 2023 General Science - Physics Question 118 English

A
1
B
2
C
$\frac{1}{2}$
D
$\frac{2}{3}$
2
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language

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 :

NDA General Ability 16 April 2023 General Science - Physics Question 117 English

A
α = 0
B
α = θ
C
α = 2θ
D
α = 4θ
3
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
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
4
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following statements is not true for a flute, a musical instrument?
A
Momentum of waves on the blowing jet determines the loudness of the produced note.
B
Arrival time of the waves on the blowing jet determines the pitch of the produced note.
C
Sound comes from a vibrating column of air inside the flute.
D
Sound comes from a vibrating column of air inside as well as outside the flute.
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