NDA Exam I 2016 – 17th April 2016
(Science)

1.  Petroleum is a combination of chains of hydrogen and_______ present in earth’s crust.
A.butane
B.hydrocarbon
C.Carbon
D.propylene
Ans: C

2. Which of the following is the heaviest metal?
A.Osmium
B.Mercury
C.Iron
D.Nickel
Ans: B

 3. Which of the following is not a greenhouse gas?
A.Carbon Dioxide
B.Methane
C.Carbon monoxide
D.Water vapours
Ans: C

4. What is the result of presence of green gases in excess?
A.Deforestation
B.Decay of Earth’s crust
C.Excess of heat
D.More snow on Earth
Ans: C

5. The greenhouse gases spread ______ energy.
A.Short Wave
B.Long Wave
C.Mid Wave
D.Ultra Wave
Ans: A

6.Why does the water drops are spherical?
A.Viscosity
B.Density
C.Polarity
D.Surface tension
Ans: D

 7. Which one of the following metals does not react with water to produce Hydrogen?
A.Cadmium
B.Lithium
C.Potassium
D.Sodium
Ans: A

8. Consider the following statements:
I. Green chemistry focuses on effects of chemical pollutants on nature.
II. Environmental chemistry focuses on technological approach to prevent pollution.
Which statement(s) is/are correct?
A.Only I
B.Only II
C.Both I & II
D.Neither I nor II
Ans-D

9.  Which of the following is used for clean oxidation?  
A. Supercritical carbon dioxide
B. Supercritical hydrogen
C.  Aqueous hydrogen peroxide
D. All of these
Ans-C

10. Green solvents are derived from ______.
A. Renewable resources
B. Carbon resources
C. Non-renewable resources
D. All of these
Ans-A

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