NDA General Ability 18 April 2021 | Physics Question 394 | General Science

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NDA General Ability 18 April 2021

MCQ (Single Correct Answer)

-1.33

Which one of the following colours may be obtained by combining green and red colours?

Blue

Magenta

Pink

Yellow

NDA General Ability 18 April 2021

MCQ (Single Correct Answer)

-1.33

Which of the following are the primary colours of light?

Yellow, Red and Green

Blue, Red and Green

Violet, Red and Yellow

Indigo, Violet and Green

NDA General Ability 18 April 2021

MCQ (Single Correct Answer)

-1.33

According to the New Cartesian Sign Convention, which one of the following is correct is respect of the formula $\dfrac{1}{f} = \dfrac{1}{v}+ \dfrac{1}{u}$, where symbols have their usual meanings?

It applies only to spherical mirrors

It applies only to spherical lenses

It applies to spherical mirrors as well as spherical lenses

It is an invalid formula

NDA General Ability 18 April 2021

MCQ (Single Correct Answer)

-1.33

Which one of the following statements is not correct for light rays?

Light travels at different speeds in different media

Light travels at almost 300 million metres per second in air

Light speeds down as it leaves a water surface and enters the air

Light speeds up as it leaves a glass surface and enters the air

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