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NDA Science Previous Year Questions


Q1.
The most important raw materials used in the manufacture of cement are
(a) Potassium nitrate, charcoal and sulphur
(b) Limestone, clay and gypsum
(c) Transition metal oxides, sodium hydroxide or potassium hydroxide
(d) Limestone, sodium carbonate and silica

Q2. Which one among the following is not a property of salt?
(a) Salts have ordered packing arrangements called lattices
(b) Salts have low melting points but high boiling points
(c) Salts are brittle
(d) Salts conduct electricity when dissolved in water or even in the molten state

Q3. DIRECTIONS : “This question 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.
Statement I: Metal ions are Lewis acids.
Statement II: Metal ions are electron pair acceptors.
(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.

Q4. The mass of water vapour per unit volume of air is known
(a) relative humidity
(b) specific humidity
(c) absolute humidity
(d) variable humidity

Q5. A syringe is a hollow glass tube with lower end tapered to a nozzle. Due to which one of the following liquid can be drawn into a syringe?
(a) Partial vacuum produced inside the glass tube
(b) Diffusion
(c) Surface tension effect
(d) Capillary action

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:
27.
Assertion (A): A test tube is filled up with 1 4 of its volume with water and immersed in a glass of water. The upper portion of the test tube looks bright.
Reason (R): This is due to dispersion of light.
(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. Consider the following statements:
A body weighs less at the equator than at the poles because:
 1. earth rotates about its axis.
 2. the ice cap at the poles increases gravitational pull.
 3. equatorial diameter is greater than the polar diameter.
 4. of some unknown facts.
Which of the statements given above is/are incorrect?
(a) 1 and 2
(b) 3 only
(c) 1 and 3
(d) 4 only

Q8. One light year is equal to
(a) 9.46×10–15m
(b) 9.46 × 1015m
(c) 9.46×10–13m
(d) 9.46 × 1013m

Q9. For a simple pendulum in simple harmonic motion, which of the following statements is/are correct?
 1. The kinetic energy is maximum at the mean position.
 2. The potential energy is maximum at the mean position.
 3. Acceleration is maximum at the mean position. Select the correct answer using the code given below: Code:
(a) 1 only
(b) 2 only
(c) 1 and 3
(d) 2 and 3

Q10. Momentum of a body is
 1. a vector quantity.
 2. a conserved quantity in an isolated system.
 3. same as force in linear motion. Select the correct answer using the code given below:
(a) 1 and 3 only
(b) 2 and 3 only
(c) 1 and 2 only
(d) 1, 2 and 3

Q11. The displacement of a particle is given by x = cos2 wt. The motion is
(a) simple harmonic
(b) periodic but not simple harmonic
(c) non-periodic
(d) None of the above

Q12. The thermal capacity of a substance is 5 cal/°F. What is water equivalent of the substance?
(a) 5g
(b) 9 g
(c) 25/9 g
(d) 5 kg

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

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