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NDA Science Quiz

Why doesn’t Archimedes’ principle hold for a vessel under a free fall?
(a) The effective value of g increases
(b) The effective value of g decreases
(c) The body immersed in the vessel will become weightless
(d) The density of air increases

Q2. When oil floats on water, the surface tension of water
(a) vanishes immediately
(b) decreases considerably
(c) increases considerably
(d) remains unaffected

Q3. If the linear momentum of a body is increased by 5%, by what percentage shall the kinetic energy increase(approx.)?
(a) 10%
(b) 20%
(c) 25%
(d) 50%

Q4. Which among the following is the necessary condition for simple harmonic motion?
(a) Constant period
(b) Constant acceleration
(c) Displacement and acceleration are proportional
(d) Displacement and torque are proportional

Q5. Which one among the following is the correct value of the gravitational force of the Earth acting on a body of mass 1 kg?
(a) 8. 9 N
(b) 9. 8 N
(c) 89 N
(d) 98 N

Q6. Which zone of a candle flame is the hottest?
(a) Dark innermost zone
(b) Outermost zone
(c) Middle luminous zone
(d) Central zone

Q7. Metal pipes used to carry water sometimes burst in the winter. This is because
(a) water expands when it freezes
(b) metal contracts more than water
(c) outside of the pipe contracts more than inside
(d) metal expands more than water

Q8. This question consists 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.
Statement I: A thermos flask is made of double-walled glass bottles. Statement II: Metals are good conductors while gas and air are poor conductors of heat.
(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.

Q9. The simple harmonic motion of a particle is given by y = 3 sin wt + 4 cos wt. Which one of the following is the amplitude of this motion?
(a) 1
(b) 5
(c) 7
(d) 12

Q10. Which one among the following waves are called waves of heat energy?
(a) Radio waves
(b) Infrared waves
(c) Ultraviolet waves
(d) Microwaves

Q11. In a simple microscope, the lens is held at a distance d from the eye and the image is formed at the least distance (D) of the distinct vision from the eye. What is the magnifying power of the microscope?
(a) D/f
(b) 1 + (D /f)
(c) 1 + (D – d )/f}
(d) 1+ {(D + d)/f}

Q12. The radius of curvature of a plane mirror
(a) is zero
(b) is infinity
(c) can be anywhere between zero and infinity
(d) None of the above

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

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