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Hi buddy here I am looking for National Defence Academy Sample Papers so would you plz tell me from where I can do download it

#2
 Super Moderator Join Date: May 2011 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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