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NDA General Science Previous Year Questions


Q1.
When iron is left exposed in open air, it gets rusted. Which constituent(s) of air is /are responsible for rusting iron?
 1. Oxygen gas present in air
 2. Moisture present in air
 3. Carbon dioxide gas present in air
Select the correct answer using the code given below:
(a) 1 only
(b) 2 only
(c) 1 and 2
(d) 2 and 3

Q2. Which one among the following metals is more reactive than hydrogen?
(a) Mercury
(b) Copper
(c) Silver
(d) Tin

Q3. Bronze is often used to make statues and medals whereas brass is used in making utensils, scientific apparatus and cartridges. Both brass and bronze are copper containing alloys, yet they differ in their chemical composition for additionally containing
(a) zinc in brass and tin in bronze
(b) chromium in brass and nickel in bronze
(c) nickel in brass and tin in bronze
(d) iron in brass and nickel in bronze

Q4.  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.
51. Statement I: At high temperature, hydrogen can reduce Pb to elemental lead.
Statement II: Hydrogen has great affinity to oxygen.
(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.

Q5. Among the following sedimentary rocks, which one is of organic origin?
(a) Gypsum
(b) Limestone
(c) Nitre
(d) Rock salt

Q6. Consider the following: Crude oil is a direct source of
 1. Asphalt
 2. Paraffin wax
 3. Fatty acids
 4. Gas oil
Which of the above are correct?
(a) 1 and 2 only
(b) 2 and 3
(c) 1 and 4 only
(d) 1, 2 and 4

Q7. The major component used in preparation of different types of glasses is
(a) Silica
(b) Sodium borate
(c) Calcium silicate
(d) Sodium silicate

Q8. Arrange the following bases in increasing order of their, basic strength
 1. Sodium hydroxide
 2. Magnesium hydroxide
 3. Aluminium hydroxide
 4. Ammonium hydroxide
Select the correct answer using the code given below
(a) 4 2 1 3
(b) 4 1 2 3
(c) 4 3 2 1
(d) 1 2 3 4

Q9. The pH of fresh milk is 6. When it turns sour, the pH
(a) becomes < 6
(b) remains the same i.e., 6
(c) becomes > 6
(d) becomes neutral, i.e., 7

Q10. Flow velocities in an incompressible fluid can be measured with which one of the following?
(a) Barometer
(b) Venturi tube
(c) Strain gauge
(d) Manometer

Q11. Let us assume that air density(0.0013g/ cm3) remains constant as we go up in the atmosphere. In such a hypothetical case, what is the approximate height of atmosphere to have 1 atmospheric pressure?
(a) 4 km
(b) 8 km
(c) 40 km
(d) 80 km.

Q12. 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:
25.
Assertion (A): If a barometer carries water instead of mercury, the height of the column for a pressure equivalent to 76 cm of mercury increases.
Reason (R): The specific heat of water is greater than that of mercury.
(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

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

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