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NDA General Science Previous Year Questions

By which one among the following mechanisms, soap removes dirt (soil) from cloth?
(a) Soap dissolves the soil as such
(b) Soap reacts with soil and converts them into soluble silicates
(c) Soap takes away the oily part of the soil and thus separates the soil from the cloth
(d) The soap molecules bind with the soil, lift the soil and keep it suspended which can then be rinsed away

Q2. Which one of the following is correct? Due to continuous use of calcium superphosphates as fertilizer in soil, the pH of soil becomes
(a) more than 7
(b) less than 7
(c) equal to 7
(d) Cannot be predicted

Q3. In oxidation
 1. Hydrogen is displaced from a substance.
 2. an electropositive element is added to or proportion of electropositive element increases in a substance.
Select the correct answer using the code given below:
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Q4. A solid cube of iron (specific gravity = 8) is melted into sheets. The side of the cube is 1m. The sheets are used to make a hollow cube. This cube floats such that its whole volume is inside water. What should be the minimum length of side of such a cube?
(a) 2.0 m
(b) 2.5 m
(c) 2.75 m
(d) 3.0 m

Q5.  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

Q6. A vessel contains oil of density 0.8 gm/cm3 over mercury of density 13.6 gm/cm3. A homogeneous sphere floats with half of its volume immersed in mercury and the other half in oil. The density of the material of the sphere in CGS unit is
(a) 3.3
(b) 6.4
(c) 7.2
(d) 12.8

Q7. Consider the following statements:
 1. The gravitational force exerted by the sun on the moon is greater than the gravitational force exerted by the earth on the moon.
 2. A heavy body falls at a faster rate than a light body in vacuum.
Which of the following statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Q8. A cord is used to lower vertically a block of mass M through a distance d at a constant downward acceleration g 4 Consider the following statements:
 1. The block is freely falling under gravity.
 2. The cord is doing work one the block.
 3. The amount of work done is (3Mgd) 4 .
(a) 1 and 2 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 1, 2 and 3

Q9. If a light body and a heavy body have equal momentum, then
(a) the lighter body has greater kinetic energy than the heavier body
(b) the lighter body has lesser kinetic energy than the heavier body
(c) the kinetic energy of the lighter body is equal to the kinetic energy of the heavier body
(d) the kinetic energy of both the bodies are independent of momentum

Q10. A body is at rest on the surface of the earth. Which one among the following statements is correct regarding this?
(a) No force is acting on the body [2010-II]
(b) Only weight of the body acts on it
(c) Net downward force is equal to the net upward force
(d) None of the above

Q11. A body attached to a spring balance weighs 10 kg on the Earth. The body attached to the same spring balance is taken to a planet where gravity is half that of the Earth. The balance will read
(a) 20 kg
(b) 10 kg
(c) 5 kg
(d) 2.5 kg

Q12. If d denotes the distance covered by a car in time t and s r denotes the displacement by the car during the same time, then:

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

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