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NDA General Science Last Year Questions


Q1.
What is the term used to denote the critical temperature at which the air becomes saturated with vapour and below which the condensation is likely to begin?
(a) Condensation point
(b) Evaporation point
(c) Dew point
(d) Point of critical temperature

Q2. The number of protons in a negatively charged atom (anion) is
(a) more than the atomic number of the element
(b) less than the atomic number of the element
(c) more than the number of electrons in the atom
(d) less than the number of electrons in the atom

Q3. 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: Conversion of blue copper sulphate to black cupric oxide on heating is a physical change.
Statement II: A change in which chemical composition does not change is called physical change.
(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. A bee-sting leaves an acid which causes pain and irritation. The injected acid is
(a) acetic acid
(b) sulphuric acid
(c) citric acid
(d) methanoic acid

Q5. Which one of the following elements cannot displace hydrogen gas from a dilute acid?
(a) Zinc
(b) Copper
(c) Magnesium
(d) Iron

Q6. Which one of the following is a transition metal?
(a) Aluminium (Al)
(b) Manganese (Mn)
(c) Magnesium (Mg)
(d) Calcium (Ca)

Q7. Solutions in test tubes containing H2O and aqueous NaOH can be differentiated with the help of
(a) red litmus
(b) blue litmus
(c) Na2CO3
(d) HCl (aqueous)

Q8.  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.
52. Statement I: Water is a high boiling point liquid.
Statement II: Hydrogen bonding in water is responsible for high boiling point of water.
(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. Which one of the following pairs is not correctly matched?
(a) Major components of air Nitrogen and oxygen gases
(b) Components of air Carbon dioxide and water responsible for vapours Photosynthesis
(c) Components of air Rare gases responsible for air pollution
(d) Component of air Nitrogen gas essential for growth and development of plants

Q10. Alum is used as
(a) an analgesic
(b) a fertilizer
(c) a disinfectant
(d) a purifier for water

Q11. The reaction that takes place in soap making is called saponification. Basically soap is sodium or potassium salts of
(a) long chain monocarboxylic acids
(b) glycerol
(c) long chain dicarboxylic acids
(d) long chain tricarboxylic acids

Q12. The concentration of hydrochloric acid in a given solution is 10–8 M. What is the value of pH for this solution?
(a) 7
(b) > 7 but not 14
(c) < 7
(d) 14

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

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