1
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following colours may be obtained by combining green and red colours?
A
Blue
B
Magenta
C
Pink
D
Yellow
2
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which of the following are the primary colours of light?
A
Yellow, Red and Green
B
Blue, Red and Green
C
Violet, Red and Yellow
D
Indigo, Violet and Green
3
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
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?
A
It applies only to spherical mirrors
B
It applies only to spherical lenses
C
It applies to spherical mirrors as well as spherical lenses
D
It is an invalid formula
4
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following statements is not correct for light rays?
A
Light travels at different speeds in different media
B
Light travels at almost 300 million metres per second in air
C
Light speeds down as it leaves a water surface and enters the air
D
Light speeds up as it leaves a glass surface and enters the air
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