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NDA Science Practice Sets

According to which one of the following laws it is indicated that when two or more gases react with one another, their volumes bear a simple ratio?
(a) Law of mass action
(b) Law of multiple proportions
(c) Law of reciprocal proportions
(d) Law of combining volumes

Q2. Which one among the following nitrogen compounds has the least percentage of nitrogen by mass?
(a) (NH4)3 PO4
(b) NH3
(c) NH4OH
(d) NH4NO3

Q3. Which one of the following is not an allotrope of carbon?
(a) Soot
(b) Graphite
(c) Diamond
(d) Carborundum

Q4. The pure form of carbon is
(a) diamond
(b) graphite
(c) charcoal
(d) fullerene

Q5. The metal compound commonly found in Sindhoor or Kumkum is based on
(a) tin
(b) lead
(c) copper
(d) zink

Q6. Consider the following statements with regard to the properties of water I. Water is a good solvent for ionic compound but poor solvent for covalent compound.
II. Water is a good solvent for covalent compound but poor solvent for ionic compound.
III. Water has maximum density at the temperature 277 K.
Which of the statements given above are correct?
(a) I and III only
(b) II and III only
(c) I and II only
(d) I, II and III

Q7. During explosion of gunpowder, which of the following gases are evolved in the proportion of 1: 3?
(a) Oxygen: Nitrogen
(b) Nitrogen: Oxygen
(c) Nitrogen: Carbon dioxide
(d) Carbon dioxide: Nitrogen

Q8. Which one of the following fertilizers has the maximum percentage of nitrogen?
(a) Ammonium sulphate
(b) Urea
(c) Calcium cyanamide
(d) Calcium ammonium nitrate

Q9. Which one of the following is the most important characteristic of water to act as a good solvent?
(a) Purity fo water
(b) Ionizing power of water
(c) Polar nature of water
(d) Dissolving power of water

Q10. The metal atom, which is present in superphosphate, is
(a) sodium (Na)
(b) potassium
(c) calcium (Ca)
(d) magnesium (Mg)

Q11. In a redox reaction, Na2 S2O3 changes to Na2 S4O6. What is the equivalent weight of Na2 S2O3?
(a) Same as its molecular weight
(b) 1/2 × (its molecular weight)
(c) 1/3 × (its molecular weight)
(d) 1/4 × (its molecular weight)

Q12. Human stomach produces acid ‘X’ which helps in digestion of food. Acid ‘X’ is
(a) acetic acid
(b) methanoic acid
(c) hydrochloric acid
(d) citric acid

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

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