Q 1 . With reference to India’s satellite launch vehicles, consider the following statements:
1 . PSLVs launch the satellites useful for Earth resources monitoring whereas GSLVs are designed mainly to
launch communication satellites.
2 . Satellites launched by PSLV appear to remain permanently fixed in the same position in the sky, as
viewed from a particular location on Earth.
3 . GSLV Mk III is a four-staged launch vehicle with the first and third stages using solid rocket motors;
and the second and fourth stages using liquid rocket engines.
Which of the statements given above is/are correct.?
(a) 1 only
(b) 2 and 3
(c) 1 and 2
(d) 3 only
(a) ISRO developed PSLV to launch satellites into polar orbits and GSLV to launch geosynchronous satellites into geostationary orbits. Geostationary satellites orbit around the earth in 24 hours and since the earth rotates with the same period, the satellite would appear fixed from any point on earth. • GSLV is a 3-stage launch vehicle, where first 2 stages are similar to PSLV with same solid and liquid nature of fuel but the third stage is completely different, i.e.,cryogenic stage.
Q 2 . For the measurement/estimation of which of the following are satellite images/remote sensing data used?
1 . Chlorophyll content in the vegetation of a specific location
2 . Greenhouse gas emissions from rice paddies of a specific location
3 . Land surface temperatures of a specific location
Select the correct answer using the code given below:
(a) 1 only
(b) 2 and 3 only
(c) 3 only
(d) 1, 2 and 3
(d) Satellite are used for ocean remote sensing . It can detect chlorophyll and suspended sediment concentrations and dissolved organic matter, which can affect ocean colour, as well as temperatures on the sea surface.
Q 3 . With the present state of development, Artificial Intelligence can effectively do which of the following?
1 . Bring down electricity consumption in industrial units
2 . Create meaningful short stories and songs
3 . Disease diagnosis
4 . Text-to-speech conversion
5 . Wireless transmission of electrical energy
Select the correct answer using the code given below:
(a) 1, 2, 3 and 5 only
(b) 1, 3, and 4 only
(c) 2, 4, and 5 only
(d) 1, 2, 3, 4 and 5
(d) AI has been used for writing songs and stories. • A.I. can be used for speech-to-text and text-to speech,assistive diagnostic solutions;
Q 4 . With reference to visible light communication (VLC) technology, which of the following statements are correct?
1 . VLC uses electromagnetic spectrum wavelengths 375 to 780nm
2 . VLC is known as long-range optical wireless communication
3 . VLC can transmit large amounts of data faster than Bluetooth
4 . VLC has no electromagnetic interference
Select the correct answer using the code given below
(a) 1, 2 and 3 only
(b) 1, 2 and 4 only
(c) 1, 3 and 4 only
(d) 2, 3 and 4 only
(c) Li-Fi is a Visible Light Communications (VLC) system for running wireless communication. Li-Fi’s main disadvantage is that it is effective for short range only.
Q 5 . With reference to solar water pumps, consider the following statements:
1 . Solar power can be used for running surface pumps and not for submersible pumps,
2 . Solar power can be used for running centrifugal pumps and not the ones with piston.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
(d) Some solar submersible pumps use a centrifugal mechanism as a surface pump, While others use a positive displacement mechanism. • Solar powered piston pump systems can pump water from a well and deliver it to an elevated Storage tank.
Q 6 . With reference to the recent developments in science which one of the following statements is not correct?
(a) Functional chromosomes can be created by joining segments of DNA taken from cells of different species.
(b) Pieces of artificial functional DNA can be created in laboratories.
(c) A piece of DNA taken out from an animal cell can be made to replicate outside a living cell in a laboratory.
(d) Cells taken out from plants and animals can be made to undergo cell division in laboratory petri dishes.
(a) • Scientists have created First Living Organism With ‘Artificial’ DNA. • DNA replication can also be performed in vitro (outside a cell). • Cell division of Chlamydomonas is usually achieved in the laboratory by alternation of light and dark periods.
Q 7 . ‘RNA interference (RNA-i)’ technology has gained popularity in the last few years. Why?
1 . It is used in developing gene silencing therapies.
2 . It can be used in developing therapies for the treatment of cancer.
3 . It can be used to develop hormone replacement therapies.
4 . It can be used to produce crop plants that are resistant to virtual pathogens.
Select the correct answer using the code given below.
(a) 1, 2 and 4
(b) 2 and 3
(c) 1 and 3
(d) 1 and 4 only
(a) • Using RNA-interference technology, scientists have made major breakthroughs in introducing resistance to many viruses in various crops. RNA-i is being explored as a form of treatment for a variety of diseases, including hepatitis, AIDS, Huntington disease,and cancer.
Q 8 . With reference to the carbon nanotubes, consider the following statement :
1 . They can be used as the carriers of drugs and antigens in the human body.
2 . They can be made into artificial blood capillaries for an injured part of human body.
3 . They can be used in biochemical sensors.
4 . Carbon nanotubes are biodegradable.
Which of the statements given above are correct ?
(a) 1 and 2 only
(b) 2, 3 and 4 only
(c) 1, 3 and 4 only
(d) 1, 2, 3 and 4
(d) Researchers have made a carbon nanotube based sensor for detecting cancer cells. • For biomedical applications, carbon nanotubes show promise as vehicles for targeted drug-delivery and nerve cell regeneration. • Artificial blood vessels can be made .
Q 9 . Consider the following statements :
If there were no phenomenon of capillarity
1 . it would be difficult to use a kerosene lamp
2 . one would not be able to use a straw to consume a soft drink
3 . the blotting paper would fail to function
4 . the big trees that we see around would not have grown on the Earth
Which of the statements given above are correct?
(a) 1, 2 and 3 only
(b) 1, 3 and 4 only
(c) 2 and 4 only
(d) 1, 2, 3 and 4
(b) It would be difficult to use a kerosene lamp. The blotting paper would fail to function. The big trees that we see around would not have grown on the Earth .
Q 10 . Ball bearings are used in bicycles, cars, etc., because
(a) the actual area of contact between the wheel and axle is increased
(b) the effective area of contact between the wheel and axle is increased
(c) the effective area of contact between the wheel and axle is reduced
(d) None of the above statements is correct
(c) Ball bearings are used to reduce friction and friction is directly proportional to effective surface area. So if effective surface area is reduced then friction will also reduce.
