Basic Sciences Questions for NDA

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Q. 1 The working principle of a washing machine is:

(a) centrifugation

(b) dialysis

(c) reverse osmosis

(d) diffusion

Q. 2 When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in

(a) pitch, loudness and quality

(b) Pitch and loudness

(c) quality only

(d) loudness only

Q. 3 Who among the following anticipated Newton by declaring that all things gravitate to the earth?

(a) Aryabhatta

(b) Varahamihira

(c) Buddhagupta

(d) Brahmagupta

Q. 4 Optical fibre works on the principle of:

(a) total internal reflection

(b) refraction

(c) scattering

(d) interference

Q. 5 Suppose a rocketship is receding from the earth at a speed of 2/ 10th the velocity of light. A light in the rocketship appears blue to the passengers on the ship. What colour would it appear to an observer on the earth?

(a) Blue

(b) Orange

(c) Yellow

(d) Yellow-orange

Q. 6 Cryogenic engines find applications in:

(a) sub-marine propulsion

(b) frost-free refrigerators

(c) rocket technology

(d) researches in superconductivity

Q. 7 The clouds float in the atmosphere because of low:

(a) temperature

(b) velocity

(c) pressure

(d) density

Q. 8 Given below are two statements, one labelled as Assertion (A) and other labelled as

Reason (R)

Assertion (A) : A diamond sparkles more than a glass imitation cut to the same shape.

Reason (R) : The refractive index of diamond is less than that of glass.

In context of the above two statements, which one of the following is correct?

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true and R is not a correct explanation of A

(c) A is true but R is false

(d) A is false but R is true

Q. 9 An air bubble in water will act like a

(a) convex mirror

(b) convex lens

(c) concave mirror

(d) cancave lens

Q. 1O When a mirror is rotated by an angle 10, the reflected ray will rotate by:

(a) 0°

(b) 5°

(c) 10°

(d) 20°

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