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NDA General Science Questions

In a sitar wire which one of the following types of vibration is produced?
(a) Progressive longitudinal
(b) Stationary longitudinal
(c) Progressive transverse
(d) Stationary transverse

Q2. Which one among the following is not produced by sound waves in air?
(a) Polarization
(b) Diffraction
(c) Reflection
(d) Refraction

Q3. Consider the following statement: The principle of total internal reflection is applicable to explain the
 1. Formation of mirage in desert.
 2. Formation of image in microscope.
 3. Colour of evening sky.
 4. Operation of optical fibres. Which of the statement given above are correct?
(a) 1 and 4
(b) 3 and 4
(c) 2 and 3
(d) 1 and 2

Q4. A ray of light falls on a transparent glass plate. A part of it is reflected and a part is refracted. The reflected and refracted rays can be perpendicular to each other for
(a) angle of incidence equal to 90°
(b) angle of incidence equal to zero
(c) only one angle of incidence
(d) more than one angle of incidence

Q5. Which one among the following is used to make periscope?
(a) Concave lens
(b) Concave mirror
(c) Plane mirror
(d) None of the above

Q6. DIRECTIONS : The following questions consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answer to these items using the codes given below.
57. Statement I: A myopic person is advised to use concave lens.
Statement II: The eye lens of a myopic person focuses the parallel rays coming from distant objects in front of the retina.
(a) Both the statements individually true and Statement II is the correct explanation of Statement I.
(b) Both the statements are individually true but Statement II is not correct explanation of Statement I.
(c) Statement I is true but Statement II is false.
(d) Statement I is false but Statement II is true.

Q7. When an electric bulb breaks, what is the reason for a mild bang?
(a) A chemical reaction between the enclosed gases
(b) Compressed gases rush out suddenly
(c) The air rushes in to fill the evacuated space
(d) None of the above

Q8. An electric iron of resistance 20 W takes a current of 5 A. The heat developed in joules in 30 s is
(a) 5 kJ
(b) 10 kJ
(c) 15 kJ
(d) 20 kJ

Q9. The material used for electric fuse is an alloy of tin and lead. This alloy should have
(a) high specific resistance and low melting point
(b) low specific resistance and high melting point
(c) low specific resistance and low melting point
(d) high specific resistance and high melting point

Q10. Two metallic wires A and B are of same material and have equal length. If the cross-sectional area of B is double that of A, then which one among the following is the electrical resistance of B?
(a) Twice that of A
(b) 4 times that of A
(c) 1/4 that of A
(d) 1/2 that of A

Q11. A current I flows through a potential difference V in an electrical circuit containing a resistance R. The product of V and I, i.e., VI may be understood as
(a) resistance R
(b) heat generated by the circuit
(c) thermal power radiated by the circuit
(d) rate of change of resistance

Q12. The neutron, proton, electron and alpha particle are moving with equal kinetic energies. How can the particles be arranged in the increasing order of their velocities?
(a) alpha particle-neutron-proton-electron
(b) proton-electron-neutron-alpha particle
(c) electron-proton-neutron-alpha particle
(d) neutron-proton-electron-alpha particle

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

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