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# NDA General Science Last Year Questions

Q1.
A far-sighted person has a near point at 100 cm. What must be the power of the correcting lens?
(a) – 0.8 D
(b) – 3.0 D
(c) + 0. 8 D
(d) + 3.0 D

Q2. The ratio of the focal length of the objective to the focal length of the eyepiece is greater than one for
(a) a microscope
(b) a telescope
(c) both microscope and telescope
(d) neither microscope nor telescope

Q3. The image formed by a convex mirror of a real object is larger than the object
(a) when u < 2f
(b) when u > 2f
(c) for all values of u
(d) for no value of u (u = object distance, f = focal length)

Q4. An object is placed at the focus of a concave mirror. The image will be
(a) real, inverted, same size at the focus
(b) real, upright, same size at the focus
(c) virtual, inverted, highly enlarged at infinity
(d) real, inverted, highly enlarged at infinity

Q5. A current is passed through a vertical spring from whose lower end a weight is hanging. What will happen to the weight?
(a) The weight shall go up
(b) The weight shall go down
(c) The position of the weight will remain the same
(d) The weight shall oscillate

Q6. If the current is flowing through a 10 ohm resistor, then in which one of the following cases maximum heat will be generated?
(a) 5 A in 2 min
(b) 4 A in 3 min
(c) 3 A in 6 min
(d) 2 A in 12 min

Q7. The resistance of a Wire that must be placed parallel with a 120 resistance to obtain a combined resistance of 4W is
(a) 2W
(b) 4W
(c) 6W
(d) 8W

Q8. If a heater coil is cut into two equal parts and only one part is used in the heater, the heat generated will be
(a) doubled
(b) four times
(c) one-fourth
(d) halved

Q9. The main power supply in India is at 220 V, whereas that in the US is at 110 V. Which one among the following statements in this regard is correct?
(a) 110 V is safer but more expensive to maintain
(b) 110 V is safer and cheaper to maintain
(c) 110 V leads to lower power loss
(d) 110 V works better at higher latitudes

Q10. A current-carrying wire is known to produce magnetic lines of force around the conducting straight wire, the direction of the lines of force may be described by:
(a) left-hand thumb rule for up-current and right-hand thumb rule for down current
(b) right-hand thumb rule for up-current and left-hand thumb rule for down current
(c) right-hand thumb rule for both up and down currents
(d) left-hand thumb rule for both up and down currents

Q11. Which one of the following is correct? The wavelength of the X-rays
(a) is longer than the wavelength of sound waves
(b) is longer than the wavelength of the yellow sodium light
(c) is longer than the wavelength of radio waves
(d) is of the order of 0.1 nanometer

Q12. A stable nucleus (light with A < 10) has
(a) exactly the same number of neutrons and protons
(b) more neutrons than protons
(c) no neutrons
(d) no protons

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

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