Consider the following kinds of organisms:
1. Bacteria
2. Fungi
3. Flowering plants
some species of which of the above kinds of organisms are employed as biopesticides?
Biomass gasification is considered to be one of the sustainable solutions to the power crisis in India. In this context, which of the following statements is / are correct?
1. Coconut shells, groundnut shells and rice husk can be used in biomass gasification.
2. The combustible gases generated from biomass gasification consist of Hydrogen and carbon dioxide only.
3. The combustible gases generated from biomass gasification can be used for direct heat generation but not in internal combustion engines.
Select the correct answer using the codes given below:
What is the role of ultraviolet (UV) radiation in the water purification systems?
1. It inactivates / kills the harmful micro organisms in water.
2. It removes all the undesirable odours from the water.
3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.
Which of the statements given above is / are correct?
Graphene is frequently in the news recently. What is its importance?
1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and has high optical transparency.
4. It can be used as conducting electrodes required for touch screens, LCDs and organic LEDs.
Which of the statements given above are correct?
Lead ingested or inhaled, is a health hazard After the addition of lead to petrol has been banned, what still are the sources of lead poisoning?
1. Smelling units
2. Pens and pencils
3. paints
4. Hair oils and cosmetics
Select the correct answer using the codes given below:
With reference to 'stem cells', frequently in the news, Which of the following statements is / are correct?
1. Stem cells can be derived from mammals only.
2. Stem cells can be used for screening new drugs.
3. Stem cells can be used for medical therapies.
Select the correct answer using the codes gives below:
Consider the following statements: Chlorofluorocarbons, known as ozone-depleting substances, are used.
1. In the production of plastic foams
2. in the production of tubeless tyres
3. in cleaning certain electronic components
4. as pressurizing agents in aerosol cans
Which of the statements given above is/are correct?
A team of scientists at Brookhaven National Laboratory including those from India created the heaviest anti-matter (anti-helium nucleus). What is / are the implication/implications of the creation of anti-matter?
1. It will make mineral prospecting and oil exploration easier and cheaper.
2. It will help probe the possibility of the existence of stars and galaxies made of anti-matter.
3. It will help us understand the evolution of the universe. Select the correct answer using the codes given below:
Which of the following is/are cited by the scientists as evidence/evidences for the continued expansion of the universe?
1. Detection of microwaves in space
2. Observation of redshift phenomenon in space
3. Moment of asteroids in space 4. Occurrence of supernova explosions in space
select the correct answer using the codes given below:
1 and 2
2 only
1, 3 and 4
None of the above can be cited as evidence
Electrically charged particles from space travelling at speed of several hundred km/sec can severely harm living beings if they reach the surface of the Earth. What prevents them from reaching the surface of the Earth?
The Earth's magnetic field diverts them towards its poles.
Ozone layer around the Earth reflects them back to outer space
Moisture in the upper layers of atmosphere prevents them from reaching the surface of the Earth.
None of the statements (a), (b) and (c) given above is correct
