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NDA Science Previous Year Questions

Which one of the following is the correct statement? If pieces of copper and germanium are cooled from room temperature to liquid nitrogen temperature, then the
(a) resistance of each increases
(b) resistance of each decreases
(c) resistance of copper decreases while that of germanium increases
(d) resistance of copper increases while. that of germanium decreases

Q2. A proton and an electron having equal velocity are allowed to pass through a uniform magnetic field. Which one of the following statements is correct in this connection?
(a) The proton and the electron experience equal and opposite force
(b) The proton experiences greater force then does the electron
(c) The electron experiences more force than does the proton
(d) No moving charged particle experiences a force in a magnetic field

Q3. The magnetic lines of force due to the bar magnet
(a) intersect inside the body of the magnet
(b) intersect at neutral points only
(c) intersect only at north and south poles
(d) cannot intersect at all

Q4. Magnets attract magnetic substances are iron, nickel, cobalt, etc. They can also repel
(a) paramagnetic substances
(b) ferromagnetic substances
(c) diamagnetic substances
(d) non-magnetic substances

Q5. In India, distribution of electricity for domestic purpose is done in the form of
(a) 220 V; 50 Hz
(b) 110 V; 60 Hz
(c) 220 V; 60 Hz
(d) 110 V; 50 Hz

Q6. 2 Consider the following statements:
 1. X-rays show transverse wave characteristics.
 2. X-rays can eject electrons from certain metal surfaces
 3. X-rays of 0.1 Å are harder than X-rays of 0.2 Å.
Which of the statements given above is/are, correct?
(a) 1 only
(b) l and 2 only
(c) 2 and 3 only
(d) 1, 2 and 3

Q7. Which of the following is the range of frequency used in optical communication?
(a) 103– 104 Hz
(b) 108– 109 Hz
(c) 1013– 1014 Hz
(d) 1016– 1017Hz

Q8. This question 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:
Assertion (A): Radio does not work in a moving train unless aerial is put outside the window.
Reason (R): The train compartment acts as a hollow cylinder and charge is centred which does not allow radio to work.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is NOT the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true .

Q9. Which one of the following is the correct statement? The force binding the nucleons inside the nucleus is:
(a) charge dependent
(b) strong and highly repulsive
(c) a central force
(d) charge independent

Q10. Which of the statements with regard to Isotopes and Isobars is/are correct?
 1. Isotopes have same mass number.
 2. Isobars have same atomic number.
Select the correct answer using the code given below:
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Q11. Calcium carbonate is naturally available as limestone and can also be synthesized from quick lime. It is seen that the compositions of the elements in both the natural and synthetic calcium carbonate are same. The validity of which one among the following laws is confirmed by this observation?
(a) Law of conservation of mass
(b) Law of definite proportion
(c) Law of multiple proportion
(d) Avogadro’s law

Q12. Which one among the following is the equivalent weight of sulphuric acid? (Atomic weight: H = 1, S = 32, O = 16)
(a) 98
(b) 60
(c) 100
(d) 49

1. 2. (a)3. (d)4. (c)5. (a)6. d7. 8. c9. (d)10. (d)11. (b)12. (d)

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