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# NDA General Science Practice Test

Q1.
Kinetic viscosity of a given liquid is the ratio of the
(a) coefficient of viscosity to the density
(b) coefficient of viscosity to the surface tension
(c) density to the coefficient of viscosity
(d) surface tension to the coefficient of viscosity

Q2. 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:
Assertion(A): In summer a block of iron is hotter than a block of wood.
Reason(R): The relative density of iron is more than the relative density of wood.
(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

Q3. What would be the power of an engine which supplies 18 kJ of energy per minute?
(a) 200 W
(b) 250 W
(c) 300 W
(d) 1080 W

Q4. A long jumper runs before jumping because he
(a) covers a greater distance
(b) maintains momentum conservation
(c) gains energy by running
(d) gains momentum

Q5. For a particle revolving in a circular path, the acceleration of the particle is
(a) along the tangent
(b) along the radius
(c) zero
(d) along the circumference of the circle

Q6. A body is thrown upward against the gravity ‘g’ with initial velocity ‘u’. Which one among the following is the correct expression for its final velocity when attains the maximum height?
(a) u2 /(2g)
(b) 2g/u2
(c) u2g/2
(d) None of the above

Q7. An object is undergoing a non-accelerated motion. Its rate of change of momentum is
(a) a non-zero constant
(b) zero
(c) not a constant
(d) None of the above

Q8. A Centigrade thermometer and Fahrenheit thermometer are dipped in boiling water. The temperature of water is lowered till the Fahrenheit thermometer registers half of its upper fixed point. What is the corresponding fall temperature registered by the Centigrade thermometer?
(a) Half of its range of temperature between the upper and the lower fixed points
(b) Approximately 41°C
(c) Approximately 59°C
(d) 18°C

Q9. The sun is constantly radiating energy and yet its surface temperature is nearly constant at 6000°C. The constancy of solar temperature is due to
(a) fission
(b) radioactivity
(c) fusion
(d) black hole evaporation

Q10. Assertion (A): Water gets heated quickly although it is a bad conductor of heat.
Reason (R): Water gets heated mainly by the mode of convection.
(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

Q11. Some common mediums in which speed of sound waves is measured are mentioned below?
1. Air
2. Steel
3. Copper
4. Water What is the correct increasing order of the speed of sound ?
(a) 1 < 4 < 2 < 3
(b) 4 < 1 < 2 < 3
(c) 1 < 4 < 3 < 2
(d) 4 < 1 < 3 < 2

Q12. Bats can ascertain distance, directions, nature and size of the obstacles at night. This is possible by reflection of the emitted
(a) ultrasonic waves from the bat
(b) ultrasonic waves from the distant objects
(c) supersonic waves from the bat
(d) supersonic waves from the distant objects

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

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