List of top Environmental Sciences Questions

Which of the following phosphate species does not exist in water?

When ice starts melting from 0°C to 8.5°C, its density will:

What will be the unit of equilibrium constant for the following reaction?
CH₃COCH₃ + HCN ⇌ CH₃C(OH)(CN)CH₃

Which of the following microbial species are helpful in the denitrification process?
Microbial species:
A. Rhizobium sp
B. Achromobacter
C. Pseudomonas
D. Nitrosomonas
E. Azotobacter
Choose the correct answer from the options given below:

Which of the following codons are called nonsense codons?

Cooking pans made from which of the following metals would need less heat to achieve a certain cooking temperature?

Match List I with List II:

LIST I (Experiment)	LIST II (Conclusion)
A. Photoelectric effect	I. Ether medium does not exist
B. Michelson-Morley	II. Light is made up of photons
C. Stern-Gerlach	III. Quantization of electronic orbit
D. Franck-Hertz	IV. Electron spin moment

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Arrange the following II B (or 12) group elements in the increasing order of their Pauling electronegativities:
Elements:
A. Zn
B. Hg
C. Cd
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What will be the molar concentration of ammonium ion in a 100 ppb ammoniacal solution?

In which of the following pairs of chemical species does sulfur (S) not have the same oxidation number?

Which of the following chemical species will dominantly exist in water having a pH of less than 5?

Which of the following were the characteristics of the prebiotic primitive Earth?
Characteristics:

1. A. Presence of \( \text{CO}_2 \)
2. B. Presence of \( \text{CH}_4 \)
3. C. Presence of \( \text{H}_2\text{O} \) vapour
4. D. Presence of \( \text{O}_2 \)

Choose the correct answer from the options given below:

What is the hardness of corundum in the Mohs scale of hardness?

Match List I with List II:

LIST I	LIST II
A. Feldspar	I. Halide
B. Gypsum	II. Silicate
C. Azurite	III. Carbonate
D. Halite	IV. Sulfate

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Which of the following minerals have platy crystal habit?
Minerals:
A. Muscovite
B. Sillimanite
C. Asbestos
D. Biotite
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What is the plutonic equivalent of rhyolite?

In the asthenosphere, the velocity of S-waves in partly molten rocks:
A. Increases
B. Decreases
C. Remain Constant
D. First increases then decreases
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Water that got trapped during the formation of sedimentary rock is referred to as:

The coal mining carried out by landowners/local miners in Meghalaya state of India in the form of a long narrow opening is known as:

A black body has a temperature of 2900 K. The wavelength of peak emission ($λ_{max}$) of the radiation emitted from it is approximately equal to:

Identify the correct statements:
Statements:
A. Eddy diffusion is a dominant mixing process in the stratosphere.
B. Height of the troposphere at poles is less than that over the equator.
C. Mean free path of molecules in the mesosphere is longer than that in the troposphere.
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Earthquakes occur in:

Arrange the following minerals in the correct sequence of crystallization starting from a cooling magma:
Minerals:
A. Oligoclase
B. Muscovite
C. Anorthite
D. Quartz
Choose the correct answer from the options given below:

What will be the energy of 1 mole of photons having a wavelength of 200 nm?
Planck’s constant, \( h = 6.6 \times 10^{-34} \, \mathrm{Js} \) and Speed of light, \( c = 3.0 \times 10^8 \, \mathrm{ms^{-1}} \)