Q1. Which of the following is not a water-brone disease?
(a) Typhoid
(b) Hepatitis
(c) Cholera
(d) Dengue
(e) None of the above
Q2. Identify the air pollutant in urban areas which irritates eyes and also respiratory tract of human beings.
(a) Particulate matter
(b) Oxides of nitrogen
(c) Surface ozone
(d) Carbon monoxide
(e) None of the above
Q3. Which one of the following polymers is used for making bullet proof windows?
(a) Polycarbonates
(b) Polyurethanes
(c) Polystyrene
(d) Polyamides
(e) None of the above
Q4. Which one of the following is not an explosive matter?
(a) Trinitro toluene
(b) Dinitro glycerine
(c) Cyclo Trimethylene trinitramine
(d) Nitrochloroform
(e) None of the above
Q5. The S.I. unit of acceleration is
(a) ms–1
(b) ms–2
(c) cms–2
(d) kms–2
(e) None of the above
Q6. Which one of the following statement is not correct?
(a) Water starts boiling when its vapour pressure becomes equal to atmospheric pressure.
(b) Water is known as universal solvent.
(c) Permanent hardness of water is due to presence of MgCl2, CaCl2, MgSO4 and CaSO4.
(d) Density of ice is greater than that of water.
(e) None of the above
Q7. Which one of the following is not a form of stored energy?
(a) Nuclear energy
(b) Potential energy
(c) Electrical energy
(d) Chemical energy
(e) None of the above
Q8. Who among the following gave the term ‘Nanotechnology’ and when?
(a) Richard Feynman, 1959
(b) Noria Taniguchi, 1974
(c) Eric Drexler, 1986
(d) Sumiolima, 1991
(e) None of the above
Q9. Collar cells occur in
(a) sponges
(b) hydra
(c) sandworm
(d) starfish
(e) None of the above
Q10. Which one of the following statement is not correct?
(a) Water starts boiling when its vapour pressure becomes equal to atmospheric pressure.
(b) Water is known as universal solvent.
(c) Permanent hardness of water is due to presence of MgCl2, CaCl2, MgSO4 and CaSO4.
(d) Density of ice is greater than that of water.
(e) None of the above
Solutions
S1.Ans. (d)
Sol. Dengue is not a water-borne disease; it is a mosquito-borne tropical disease caused by the dengue virus.
S2.Ans. (c)
Sol. Ground level ozone is not emitted directly into the air, but is created by chemical reactions between oxides of nitrogen (NOx) and volatile organic compounds (VOC). This occurs when pollutants emitted by cars, power plants, industrial boilers, refineries, chemical plants, and other sources chemically react in the presence of sunlight. Ozone at ground level is a harmful air pollutant and it is the main ingredient in “smog.”
S3.Ans. (a)
Sol. Bullet-proof windows are constructed using several layers of polycarbonate and/or laminated glass.
S4.Ans. (d)
Sol. Nitrochloroform is a broad-spectrum antimicrobial which is used as a fungicide, herbicide, insecticide and nematicide. It is also known as Chloropicrin.
S5.Ans. (b)
Sol. The SI unit of acceleration is the metre per second squared (m s–2).
S6.Ans. (d)
Sol. Ice is less dense in comparison to liquid water. Actually when water freezes, water (H2O) molecules form a crystalline structure by Hydrogen bonds. These bonds cause molecules to push apart lowering the density of water (H2O).
S7.Ans. (c)
Sol. Nuclear potential and chemical energies implies the stored form of energy. But electrical energy is not a form of stored energy.
S8.Ans. (b)
Sol. The term “nano-technology” had been coined by Norio Taniguichi in 1974 to describe semiconductor processes involving control on the order of a nanometer (10-9 m).
S9.Ans. (a)
Sol. Collar cells occurs in sponges and located at the anterior end of each choanocyte.
S10.Ans. (d)
Sol. Ice is less dense in comparison to liquid water. Actually when water freezes, water (H2O) molecules form a crystalline structure by Hydrogen bonds. These bonds cause molecules to push apart lowering the density of water (H2O).