Rajasthan Board Class 12 Environmental Science Question Paper 2026 PDF with Solutions - Available

If the COD value is low then -

• (A) The level of quality of water is low
• (B) The level of quality of water is high
• (C) The level of quality of water is medium
• (D) None of above

Which of the following is non-degradable?

• (A) \(CO_2\)
• (B) DDT
• (C) \(O_3\)
• (D) \(SO_2\)

The warning limit for noise pollution is-

• (A) 85dB
• (B) 90dB
• (C) 70dB
• (D) 80dB

Photovoltaic solar panels are manufactured from -

• (A) Carbon
• (B) Silver
• (C) Silicon
• (D) Germanium

The Stockholm conference was held in-

• (A) In 1972
• (B) In 2004
• (C) In 1975
• (D) In 1986

It was first used for insulin production -

• (A) Plasmodium
• (B) Eisenia fetida
• (C) GMO Bacteria
• (D) Fungi

Which of the following layers is electrically charged?

• (A) Mesosphere
• (B) Stratosphere
• (C) Troposphere
• (D) Ionosphere

Which type of radiation from sunlight is absorbed by ozone before it reaches the earth's surface?

• (A) UV-rays
• (B) X-rays
• (C) α-rays
• (D) γ-rays

The plants in the Minimata valley were infected from-

• (A) Methyl Mercury
• (B) Lead
• (C) Zinc
• (D) Methyl Orange

The plants in the Minimata valley were infected from-

• (A) Methyl Mercury
• (B) Lead
• (C) Zinc
• (D) Methyl Orange

Where was the world's first environmental conference held?

• (A) Brazil
• (B) Stockholm
• (C) New York
• (D) London

Write the importance of the Ozone layer in the atmosphere, write the reason for its depletion.

Write the definition of soil pollution and its effects.

Explain the traditional waste water treatment processes in India.

Explain the method of vermi composting technique.

Write the importance of Ozone layer in the atmosphere, write the reason for its depletion.