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NDA General Science Questions


Q1.
A man is sitting on a rotating stool with his arms outstretched. If suddenly he folds his arms the angular velocity of the man would
(a) increase
(b) decrease
(c) become zero
(d) remain constant

Q2. If the ratio of the weight of a man in a stationary lift and when it is moving downwards with uniform acceleration ‘a’ is 3: 2, then the value of ‘a’ is
(a) 3g/2
(b) g/3
(c) g
(d) 2g/3

Q3. A motor vehicle is moving on a circle with a uniform speed. The net acceleration of the vehicle is
(a) zero
(b) towards the centre of circle
(c) away from the centre along the radius of the circle
(d) perpendicular to the radius and along the velocity

Q4. Which of the following properties are most desirable for a cooking pot?
(a) High specific heat capacity and low conductivity
(b) Low specific heat capacity and high conductivity
(c) High specific heat capacity and high conductivity
(d) Low specific heat capacity and low conductivity

Q5. Which one among the following denotes the smallest temperature?
(a) 1° on the Celsius scale
(b) 1° on the Kelvin scale
(c) 1° on the Fahrenheit scale
(d) 1° on the Reaumur scale

Q6. The following questions consist of two statements, one labelled as the Assertion (A) and the other as ‘Reason (R), You are to examine these two statements carefully and select the answers to these items using the codes given below:
32.
Assertion (A): Ice melts at a temperature lower than 0°C at a pressure higher than the normal pressure.
Reason (R): The melting point of a substance always decreases with increase in pressure.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true and R is the NOT correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

Q7. A man standing between two parallel hills fires a gun and hears two echoes, one 2.5 s and the other 3.5 s after the firing. If the velocity of sound is 330 ms–1, how long will it take him to hear the third echo?
(a) 4 s
(b) 5 s
(c) 6s
(d) 8s

Q8. Which one among the following statements is not correct?
(a) In progressive waves, the amplitude may be constant and neighbouring points are out of phase with each other
(b) In air or other gases, a progressive antinode occurs at a displacement node and a progressive node occurs at a displacement antinode
(c) Transverse wave can be polarised while longitudinal wave cannot be polarised
(d) Longitudinal wave can be polarised while transverse wave cannot be polarised

Q9. Consider the following statements:
 1. The focal length of the objective of a microscope is less than the focal length of the eyepiece.
 2. The minimum distance between an object and its real image formed by a convex lens of focal length f is equal to 4 f.
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Q10. Different objects at different distances are seen by the eye. The parameter that remains constant is
(a) the focal length of the eye lens
(b) the object distance from the eye lens
(c) the radii of curvature of the eye lens
(d) the image distance from the eye lens

Q11. When a ray of light is going from one medium to another its
(a) wavelength remains same
(b) frequency remains same
(c) frequency increases
(d) wavelength increases

Q12. The human eye is like a camera and hence it contains a system of lens. The eye lens forms
(a) a straight or upright, real image of the object on the retina
(b) an inverted, virtual image of the object on the retina
(c) an inverted, real image of the object on the retina
(d) a straight or upright, real image of the object on the iris

 1. (a)2. (b)3. (b)4. 5. (b)6. (a)7. (c)8. (a)9. (c)10. (c)11. (b)12. (c)

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