NDA General Ability 18 April 2021 | Physics Question 389 | General Science

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NDA General Ability 18 April 2021

MCQ (Single Correct Answer)

-1.33

Twinkling of stars is due to

Particular frequencies of the starlight

reflection of starlight from the oceanic surface

atmospheric refraction of starlight

magnetic field of Earth

NDA General Ability 18 April 2021

MCQ (Single Correct Answer)

-1.33

Which one of the following cannot be the unit of frequency of a sound wave?

s^-1

min^-1

NDA General Ability 18 April 2021

MCQ (Single Correct Answer)

-1.33

'Beats' is a phenomenon that occurs when frequencies of two harmonic waves are

equal

far apart

multiples of each other

nearly same

NDA General Ability 18 April 2021

MCQ (Single Correct Answer)

-1.33

Light waves are incident on an air-glass boundary. Some of the light waves are reflected and some are refracted in the glass. Which one of the following properties is the same for the incident wave and the refracted wave?

Speed

Direction

Brightness

Frequency

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