NDA General Ability 16 April 2023 | Physics Question 55 | General Science

NDA General Ability 16 April 2023

MCQ (Single Correct Answer)

-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 :

v₁ = v₂

$\frac{1}{2}$M₁$v^2_1$ < $\frac{1}{2}$ M₂$v^2_2$

M₁v1 = M₂v2

M1v1 < M2v2

NDA General Ability 16 April 2023

MCQ (Single Correct Answer)

-1.33

Which one of the following statements is not true for a flute, a musical instrument?

Momentum of waves on the blowing jet determines the loudness of the produced note.

Arrival time of the waves on the blowing jet determines the pitch of the produced note.

Sound comes from a vibrating column of air inside the flute.

Sound comes from a vibrating column of air inside as well as outside the flute.

NDA General Ability 16 April 2023

MCQ (Single Correct Answer)

-1.33

A positive charge is moving towards south in a space where magnetic field is pointing in the north direction. The moving charge will experience :

a deflecting force towards north direction.

a deflecting force towards east direction.

a deflecting force towards west direction.

no deflecting force.

NDA General Ability 16 April 2023

MCQ (Single Correct Answer)

-1.33

Which one of the following astronomers proved that the Earth and other planets revolve around the Sun?

Copernicus

Kepler

Galileo

Newton

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