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National Defence Academy Sample Papers Download |

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Re: National Defence Academy Sample Papers Download
As you are looking for National Defence Academy Sample Papers soon your demand I am providing same for you Q.1. Which Boolean algebra property allows us to group operands in an expression in any order without affecting the results of the operation [for example, A + B = B + A]? associative commutative Boolean distributive Answer: B Q.2. Light from the Sun reaches us in nearly 2 minutes 4 minutes 8 minutes 16 minutes Answer: C Q.3. Nuclear sizes are expressed in a unit named Fermi angstrom newton tesla Answer: A Q.4. The minimum age of the voter in India is 15 years 18 years 21 years 25 years Answer: B Q.5. Siphon will fail to work if: the densities of the liquid in the two vessels are equal the level of the liquid in the two vessels are at the same height both its limbs are of unequal length the temperature of the liquids in the two vessels are the same Answer: B Q.6. The systematic reduction of logic circuits is accomplished by: using Boolean algebra symbolic reduction TTL logic using a truth table Answer: A Q.7. Which of the following expressions is in the sum-of-products (SOP) form? (A + B)(C + D) (A)B (CD) AB (CD) AB + CD Answer: D Q.8. An AND gate with schematic “bubbles” on its inputs performs the same function as a(n)________ gate. NOT OR NOR NAND Answer: C Q.9. Pick out the scalar quantity force pressure velocity acceleration Answer: B Q.10. Metals are good conductors of electricity because they contain free electrons the atoms are lightly packed they have high melting point All of the above Answer: A Q.11. Rectifiers are used to convert Direct current to Alternating current Alternating current to Direct current high voltage to low voltage low voltage to high voltage Answer: B Q.12. Which of the following expressions is in the sum-of-products (SOP) form? (A + B)(C + D) (A)B(CD) AB(CD) AB + CD Answer: D Q.13. The problem of the VOH (min) of a TTL IC being too low to drive a CMOS circuit and meet the CMOS requirement of VIH (min) is usually easily overcome by: adding a fixed voltage-divider bias resistive network at the output of the TTL device avoiding this condition and only using TTL to drive TTL adding an external pull-down resistor to ground adding an external pull-up resistor to VCC Answer: D Q.14. The normal stress is the same in all directions at a point in a fluid, when the fluid is A. Non-viscous B. Incompressible C. both (a) and (b) D. having no motion of one fluid layer relative to the other. Answer: D Q.15. Multiplication of 1112 by 1012 is 1100112 1000112 1111002 0001012 Answer: None of the above Q.16. If an analog signal is to be converted to an 8-bit resolution, how many comparators are used in a parallel-encoded ADC? 127 128 255 256 Answer: D Q.17. A large cube is formed from the material obtained by melting three smaller cubes of 3, 4 and 5 cm side. What is the ratio of the total surface areas of the smaller cubes and the large cube? 2 : 1 3 : 2 25 : 18 27 : 20 Answer: C Q.18. The value of log2 16 is: 1/8 4 8 16 Answer: B Q.19. If logx y = 100 and log2 x = 10, then the value of y is: 210 2100 21000 210000 Answer: C Q.20. A farmer travelled a distance of 61 km in 9 hours. He travelled partly on foot @ 4 km/hr and partly on bicycle @ 9 km/hr. The distance travelled on foot is: 14 km 15 km 16 km 17 km Answer: C Q.21. Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour? 9 10 12 20 Answer: B Q.22. Two trains 140 m and 160 m long run at the speed of 60 km / hr and 40 km / hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is: 9 9.6 10 10.8 Answer: D Q.23. Two stations A and B are 110 km apart on a straight line. One train starts from A at 7 a.m. and travels towards B at 20 kmph. Another train starts from B at 8 a.m. and travels towards A at a speed of 25 kmph. At what time will they meet? 9 a.m. 10 a.m. 10.30 a.m. 11 a.m. Answer: B Q.24. Two ships are sailing in the sea on the two sides of a lighthouse. The angle of elevation of the top of the lighthouse is observed from the ships are 30° and 45° respectively. If the lighthouse is 100 m high, the distance between the two ships is: A. 173 m B. 200 m C. 273 m D. 300 m Answer: C Q.25. From a point P on a level ground, the angle of elevation of the top tower is 30º. If the tower is 100 m high, the distance of point P from the foot of the tower is: 149 m 156 m 173 m 200 m Answer: C Q.26. Which of the following functional groups would make a carbon-based compound the least polar? Phosphate Methyl Carboxyl Amino Answer: Option B Q.27. Hydrogen bonds in a-helices are: more numerous than Vander Waals interactions not present at Phe residues analogous to the steps in a spiral staircase roughly parallel to the helix axis Answer: D Q.28. The oldest eukaryotic organisms are considered to be: diplomonads like Giardia archaea fungi animals Answer: B Q.29. All the following are considered eukaryotes except archaea fungi protozoa humans Answer: A Q.30. Which of the following organelles contain DNA, divides and possesses some degree of autonomy? Golgi apparatus Ribosome Chloroplast Peroxisomes Answer: C
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