NDA/NA SOLVED PAPER 2015-I (GENERAL KNOWLEDGE)

Total Questions: 100

21. Which one among the following happens when a swing rises to a certain height from its rest position?

Correct Answer: (b) Its kinetic energy decreases while potential energy increases
Solution:As the swing rises, its kinetic energy changes to potential energy; as with height potential energy P.E. =mgh increases. And according to law of conservation of energy total energy E = K.E + P. E constant.

22. Which one among the following is used in making gunpowder ?

Correct Answer: (b) Potassium nitrate
Solution:Gunpowder is a mixture of sulfur, charcoal, and potassium nitrate (saltpeter).

23. The cleaning action of soap and detergent in water is due to the formation of

Correct Answer: (a) Micelle
Solution:A spherical aggregate of soap molecules in the soap solution in water is called micelle. When soap is dissolved in water, it forms a colloidal suspension in which the soap molecules cluster together to form spherical micelles.

24. The chemical used as a fixer/developer in photography is

Correct Answer: (c) Sodium thiosulphate
Solution:Fixation is commonly achieved by treating the film or paper with a solution of thiosulfatesalt. Popular salts are sodium thiosulfate-commonly called hypo-and ammonium thiosulfate-commonly used in modern rapid fixer formulae.

25. Rain shadow effect is associated with

Correct Answer: (b) Orographic rainfall
Solution:The condition exists because warm moist air rises by orographic lifting to the top of a mountain range. As atmospheric pressure decreases with increasing altitude, the air has expanded and adiabatically cooled to the point that the air reaches its adiabatic dew point. At the adiabatic dew point, moisture condenses onto the mountain and it precipitates on the top and windward sides of the mountain.

26. Match List I with List II and select the correct answer using the code given below the Lists:

List-I (Place)List-II (Industry)
A. Jabalpur1. Petro-chemical industry
B. Bengaluru2. IT industry
C. Mathura3. Paper industry
D. Ballarpur4. Automobile industry
Code:ABCD
(a)4123
(b)3214
(c)4213
(d)3124
Correct Answer: (c)
Solution:Jabalpur is the place of commercial automobiles. Bangalore is the IT hub. Mathura is famous for its petro-chemical industries. Ballarpur has paper industries.

27. Which one of the following irrigation canals is the most important in terms of area coverage in Haryana?

Correct Answer: (b) The Western Yamuna canal
Solution:The total length of the canal along with its distributaries is 3,200 km and it irrigates about 4 lakh hectares in Ambala, Kurukshetra, Kamal, Panipat, Rohtak, Hissar, Sirsa, Faridabad and Jind districts. It's important branches are, the Delhi, the Hansi and the Sirsa branch.

28. Which one of the following is the smallest unit showing the properties of life such as capacity for metabolism, response to the environment, growth and reproduction ?

Correct Answer: (d) Cell
Solution:Cells are the smallest unit of life that can replicate independently, and are often called the "building blocks of life"

29. In plants, which one of the following gases is released during Photosynthesis ?

Correct Answer: (b) Oxygen
Solution:In photosynthesis, oxygen is also released as a waste product.

30. Match List I with List II and select the correct answer using the code given below the Lists:

List-I (Physical quantity)List-II (Unit)
A. Distance1. Mole
B. Amount of material2. Coulomb
C. Amount of electrical change3. Light year
D. energy4. Watt hour
Code:ABCD
(a)3124
(b)3214
(c)4213
(d)4123
Correct Answer: (a)
Solution:Large distance is measured in light year. Amount of a material is measured by mole. Amount of electrical charge is measured in coulomb. Energy is measured in watt hour.