A. Polyethylene
B. Polypropylene
C. Poly lactic acid
D. Polyester
✅ The correct answer is option C.
Example for a bio-degradable polymer is Poly lactic acid.
Example for a bio-degradable polymer is Poly lactic acid.
General Knowledge
Boost your exam preparation with the latest General Knowledge MCQs with answers and explanations. Our collection covers current affairs, world geography, history, Pakistan studies, sports, science, technology, and important international organizations. These General Knowledge multiple-choice questions are designed for students, job seekers, and competitive exam aspirants preparing for NTS, PPSC, FPSC, CSS, PMS, university entry tests, and recruitment exams. Practice online with updated General Knowledge MCQs to improve awareness, sharpen memory, and score higher in tests and interviews.
1712. Nuclear accidents mostly release radioactive __________ into the atmosphere
A. Carbon
B. Iodine
C. Phosphorus
D. Sulphur
✅ The correct answer is option B.
Nuclear accidents mostly release radioactive iodine into the atmosphere.
Nuclear accidents mostly release radioactive iodine into the atmosphere.
1713. Energy flow in ecosystem is
A. Unidirectional
B. Bidirectional
C. Multidirectional
D. None of the above
✅ The correct answer is option A.
Energy flow in ecosystem is Unidirectional.
Energy flow in ecosystem is Unidirectional.
1714. What is an Incinerator?
A. Furnace used for burning solid waste
B. Furnace used for treating liquid waste
C. Both a & b
D. None of the above
✅ The correct answer is option A.
Incineration is a waste treatment process that involves the combustion of organic substances contained in waste materials. Incineration and other high-temperature waste treatment systems are described as “thermal treatment”. Incineration of waste materials converts the waste into ash, flue gas and heat.
Incineration is a waste treatment process that involves the combustion of organic substances contained in waste materials. Incineration and other high-temperature waste treatment systems are described as “thermal treatment”. Incineration of waste materials converts the waste into ash, flue gas and heat.
1715. Sedimentation is a
A. Primary water treatment
B. Secondary water treatment
C. Tertiary water treatment
D. Final process
✅ The correct answer is option A.
Sedimentation is the tendency for particles in suspension to settle out of the fluid in which they are entrained and come to rest against a barrier. This is due to their motion through the fluid in response to the forces acting on them: these forces can be due to gravity, centrifugal acceleration, or electromagnetism.
Sedimentation is the tendency for particles in suspension to settle out of the fluid in which they are entrained and come to rest against a barrier. This is due to their motion through the fluid in response to the forces acting on them: these forces can be due to gravity, centrifugal acceleration, or electromagnetism.
1716. Nitrogen oxide and hydrocarbons released by automobiles interact to form
A. CO
B. PAN
C. SO2
D. Aerosol
✅ The correct answer is option B.
Peroxyacyl Nitrates being a secondary pollutant is not emitted directly from the automobiles or power plants but is formed from the pollutants emitted from the automobiles and power plants through the chemical reaction.
Peroxyacyl Nitrates being a secondary pollutant is not emitted directly from the automobiles or power plants but is formed from the pollutants emitted from the automobiles and power plants through the chemical reaction.
1717. If the amount of energy lost by the earth to space each year were not approximately equal to that received:
A. The atmosphere’s average temperature would change
B. The length of the year would change
C. The sun’s output would change
D. The mass of the atmosphere would change
✅ The correct answer is option A.
The atmosphere’s average temperature would change.
The atmosphere’s average temperature would change.
1718. When the air temperature is below freezing, the saturation vapour pressure over water is .
A. Equal to zero
B. Less than the saturation vapour pressure over ice
C. Greater than the saturation vapour pressure over ice
D. Equal to the saturation vapour pressure over ice
✅ The correct answer is option C.
Saturation vapour pressure increases with rising temperature. Saturation vapour pressure just above liquid water is greater than that over ice. At temperatures below freezing it takes more vapour molecules to saturate air directly above water than it does to saturate air directly above ice.
Saturation vapour pressure increases with rising temperature. Saturation vapour pressure just above liquid water is greater than that over ice. At temperatures below freezing it takes more vapour molecules to saturate air directly above water than it does to saturate air directly above ice.
1719. Which tree is known as Coral tree?
A. Quercus
B. Dipterocarps
C. Erythrina
D. Zizypus
✅ The correct answer is option C.
Coral tree (Erythrina variegata L.) is a spreading tropical and subtropical tree legume, renowned as an ornamental for its conspicuous red blossoms. In India, it is one of the most used forage tree legume used as fodder for small ruminants (Devendra, 1989). It is often used as an hedgerow and windbreak.
Coral tree (Erythrina variegata L.) is a spreading tropical and subtropical tree legume, renowned as an ornamental for its conspicuous red blossoms. In India, it is one of the most used forage tree legume used as fodder for small ruminants (Devendra, 1989). It is often used as an hedgerow and windbreak.
1720. The lowest temperature is usually observed:
A. At the time of sunset
B. Near midnight
C. Several hours before sunrise
D. Around sunrise
✅ The correct answer is option D.
The lowest temperature is usually observed around sunrise.
The lowest temperature is usually observed around sunrise.