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Question 1 reset

Natural gas is composed primarily of :

Methane

n-butane

n-octane

A mixture of n-octane and n-butane

Question 2 reset

Which one of the following chemical species of mercury is highly toxic to living system?

Atomic mercury

Organo mercurials

Mercuric ion

Mercurous ion

Question 3 reset

Which of the following can be considered in Environmental Risk Assessment?

Exposure period

Potency of a toxic material

Quality of models

All of the above

Question 4 reset

An earthquake is rated as 'major' if its magnitude in Richter Scale is in the range of :

4.0 – 4.9

5.0 – 5.9

6.0 – 6.9

7.0 – 7.9

Question 5 reset

What is the proportion of the frequency of occurrence of La Nina compared to El Nino?

Half

Twice

One-third

Two-third

Question 6 reset

An element in soil will be considered as a trace element if its concentration is ____

< 1 wt %

< 0.1 wt %

< 2 wt %

< 0.2 wt %

Question 7 reset

Which one of the following can be estimated by Flame Photometer?

Sodium and Potassium

Cadmium and Cobalt

Chlorine and Bromine

Mercury and Arsenic

Question 8 reset

When an atmosphere has an isothermal profile, it is :

Unstable

Very stable

Slightly stable

Very unstable (turbulent)

Question 9 reset

What is the wavelength range of UV-C radiation?

120 - 240 nm

240 - 280 nm

280 - 360 nm

360 - 480 nm

Question 10 reset

What can be the maximum theoretical efficiency of a silicon solar cell?

15%

30%

45%

60%

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