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TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A

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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A

12th Standard Zoology - Environmental Issues English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021

Published on: 05/11/2020

Download Tamil Nadu 12th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Std: 12th Standard - Biology

chapter: - Model Question paper

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Questions:

Multiple Choice Question

10 x 1 = 10

The most abundant green house gas is_________.

(a)

Carbon-dioxide

(b)

Methane

(c)

Sulphur-dioxide

(d)

Nitrous oxide

Stratosphere is mainly depleted by_________

(a)

Excess CO

(b)

CFC's

(c)

Ozone

(d)

Excess CO₂

Eutrophication is a result of__________

(a)

Agricultural and sewage waste

(b)

Vehicle emission

(c)

Pesticides

(d)

Industrial effluent

The molecular formula for ozone is______

(a)

O₂

(b)

O₄

(c)

O₃

(d)

O₇

According to noise pollution rules 2000, the permissible level of noise in commercial area is ________ during day and ________during night

(a)

55 db, 65 db

(b)

65 db, 55 db

(c)

70 db, 60 db

(d)

75 db, 65 db

DB is a standard abbreviation used for the quantitative expression of

(a)

The density of bacteria in a medium

(b)

A particular pollutant

(c)

The dominant bacillus in a culture

(d)

A certain pesticide

PCB is a major component of ______________

(a)

e-waste

(b)

Agro waste

(c)

sewage

(d)

Plastics

Oil spills can lead to ________________

(a)

increase of BOD

(b)

decrease of BOD

(c)

No change in BOD

(d)

None of the above

The Ozone Day is observed every year on September 16 as on this day in 1987 the ___________was signed for launching efforts to arrest the depletion of the fragile ozone layer in the stratosphere that prevents the harmful ultra-violet rays of the sun from reaching the earth. Fill the correct word in blank.

(a)

Montreal Protocol

(b)

Geneva Protocol

(c)

Kyoto Protocol

(d)

Nagoya Protocol

10.

With which of the following, the Agenda 21’ of Rio Summit, 1992 is related to?

(a)

Sustainable development