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NDA General Science Quiz

Which one of the following salts when dissolved in water makes the solution basic?
(a) Sodium chloride
(b) Copper sulphate
(c) Ferric chloride
(d) Sodium acetate

Q2. Bases turn red litmus blue and acids turn blue litmus red. A student tested a liquid with a red litmus paper and it stayed red with no change. This shows that the liquid
(a) must be pure water
(b) must be an acid
(c) is not a base
(d) is neither a base nor an acid

Q3.  Consider the following statements: If there were no capillarity,
 1. it would be impossible to use a kerosene lamp.
 2. one would not be able to use a straw to consume a soft drink.
 3. the blotting paper would fail to function.
 4. there would have been no plants on the earth.
Which of the statements given above are correct?
(a) 1, 2 and 4
(b) 1, 3, 4
(c) 2, 3
(d) 1, 2, 3, 4

Q4. The specific gravity of a substance is measured by a hydrometer at the sea level. If the measurement is done at the top of a mountain, what would be the specific gravity?
(a) Zero
(b) More than that measured at the sea level
(c) Less than that measured at the sea level
(d) Same as that measured at the sea level

Q5. The density of cast iron having specific gravity 7.20 is
(a) 7.20 kg/m3
(b) 720 kg/m3
(c) 72 kg/m3
(d) 7200 kg/m3

Q6. How does the weight of a body vary while moving from the earth to the moon?
(a) It gradually decreases till it reaches the moon surface.
(b) It gradually increases till it reaches the moon surface.
(c) First it gradually decreases to zero value and then increases till it reaches the moon surface
(d) First it gradually increases and then decreases till it reaches the moon surface.

Q7. A bullet travelling horizontally hits a block kept at rest on a horizontal surface and gets embedded into it, the two together then move with a uniform velocity. Which one of the following conservation laws holds?
(a) Conservation of angular momentum
(b) Conservation of kinetic energy
(c) Conservation of linear momentum
(d) Conservation of velocity

Q8. The weight of a body is 9.8 N at the place where g = 9.8 ms–2. Its mass is
(a) zero
(b) 9.8 kg
(c) 10 kg
(d) 1 kg

Q9. Which one among the following is correct for resultant of balanced forces?
(a) It is zero
(b) It is non-zero
(c) It varies continuously
(d) None of the above

Q10. An ant is moving on thin (negligible thickness) circular wire. How many coordinates do you require to completely describe the motion of the ant?
(a) One
(b) Two
(c) Three
(d) Zero

Q11. Two equal amounts of water are mixed by gently pouring both into an insulated cup. One part is initially at 90°C, and the other part is initially at Ti °C. If the final temperature of the mixture is 131°C, what is the value of T?
(a) 90°
(b) 68
(c) 20
(d) 0

Q12. In a pressure cooker, cooking is faster because the increases in vapour pressure
(a) increases the specific heat
(b) decreases the specific heat
(c) decreases the boiling point
(d) increases the boiling point

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

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