CBSE-NET (UGC) Environmental Science (Paper-II & Paper-III): Questions 352 - 357 of 376

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Question number: 352

» Introduction of Environmental Science » Physico-Chemical and Biological Factors in Environment

Appeared in Year: 2009

MCQ▾

Question

Doppler effect is not commonly observed using light, because: (June)

Choices

Choice (4) Response
a.

Object has to be moving at a speed that is a significant fraction of the speed of light.

b.

Sound is audible

c.

Velocity of sound is much smaller than that of light

d.

Light is an electromagnetic wave

Question number: 353

» Soil » Soil Micro-Organisms and Functions

Appeared in Year: 2009

MCQ▾

Question

Which of the following have algae as Symbionts?

Choices

Choice (4) Response
a.

Mango tree

b.

Pinus

c.

Coralloid roots of cycas

d.

Walnut

Question number: 354

» Water Chemistry » Chemistry of Water

Appeared in Year: 2009

MCQ▾

Question

In colloidal chemical substance, the light undergoes: (June)

Choices

Choice (4) Response
a.

Polarization

b.

Scattering

c.

Diffraction

d.

Total internal reflection

Question number: 355

» Water Chemistry » Concept of DO, BOD, COD

Appeared in Year: 2009

MCQ▾

Question

A measure of the amount of oxygen consumed in the biological process that breaks down organic matter is known as: (June)

Choices

Choice (4) Response
a.

Bio concentration

b.

Bioaccumulation

c.

Biomagnification

d.

Biochemical oxygen demand

Question number: 356

» Energy Resources » Radioactive Waste and Radioactivity From Nuclear Reactors

Appeared in Year: 2009

MCQ▾

Question

After 560 days, 1 gm of a radioactive element is reduced to 116gm. The half-life of the radioactive element is:

Choices

Choice (4) Response
a.

280 days

b.

140 days

c.

70 days

d.

210 days

Question number: 357

» Ecology and Evolution » Origin of Life and Speciation

Appeared in Year: 2009

MCQ▾

Question

Which of the following was formed first? (June)

Choices

Choice (4) Response
a.

DNA

b.

RNA

c.

DNA & RNA

d.

Eukaryotic cell

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