Q. Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?
1) Element with 20 protons and 18 neutrons
2) Element with 20 protons and 19 neutrons
3) Element with 20 protons and 19 neutrons
4) Element with 18 protons and 22 neutrons
Q. Bright light is found to emit from photographer's flashgun. This brightness is due to the presence of which one of the following noble gases?
1) Argon
2) Xenon
3) Neon
4) Helium
Q. Which one of the following is not a characteristic of a compound ?
1) Composition is variable
2) All particles of compound are of only one type
3) Particles of compound have two or more elements
4) It constituents cannot be separated by simple physical methods
Q. High level radioactive waste can be managed in which of the following ways?
1) Open dumping
2) Composting
3) Incineration
4) Dumping in sealed containers
Q. The black colour of the white paint formed due to long exposure to air is removed and white colour regenerated by which one of the following?
1) Hydrogen peroxide
2) Sulpher Dioxide
3) Hydrochloric acid
4) Acetic Acid
Q. Burning biomass for energy does not release -
1. sulphur
2. mercury
3. nitrogen
Select the correct answer using the codes given below :
1) 1 and 2 only
2) 2 only
3) 2 and 3 only
4) 1, 2 and 3
Q. Natural rubber is a polymer of -
1) Neoprene
2) Isoprene
3) Chloroprene
4) 1, 3-butadiene
Q. Structurally biodegradable detergent should contain -
1) Normal alkyl chain
2) Branched alkyl chain
3) Phenyl side chain
4) Cyclohexyl side chain
Q. Which of the following does not exhibit allotropy?
1) Carbon
2) Silicon
3) Lead
4) Tin
Q. Which of the following is the most abundant metal?
1) Fe
2) Al
3) Ti
4) Cu
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