Q. The Principle of cleaning by soap is
1) Surface tension
2) Flotation
3) Viscosity
4) Elasticity
Q. The phenomenon of radioactivity was adopted by
1) Marie Curie
2) Pierre Curie
3) Henri Becquerel
4) J. J. Thomson
Q. Two atoms are said to be isotopes if -
1) They have the same atomic number but different mass numbers
2) They have the same number of neutrons but different mass numbers.
3) The sum of the number of protons and neutrons is the same, but the number of protons is different.
4) They have the same number of neutrons but different modes of radioactive decay
Q. Water is a good solvent. This is due to high -
1) dielectric constant of water
2) surface tension of water
3) specific heat of water
4) heat of fusion of water
Q. The bond which is present between water molecules is
1) electrovalent bond
2) covalent bond
3) hydrogen bond
4) van der waals bond
Q. Which one among the following is the chemical formula of gypsum which is an ingredient of cement?
1) Ca2SiO4
2) CaSO4 . 2H2O
3) CaO
4) CaSO4 . 3H2O
Q. It is an industrial process of producing ammonia by the reaction of nitrogen with hydrogen in the presence of a catalyst -
1) Solvay Process
2) Bayer Process
3) Haber Process
4) Bessemer Process
Q. The common refrigerant used in domestic refrigerator is -
1) Neon
2) Oxygen
3) Nitrogen
4) Freon
Q. The acid contained in vinegar is
1) Acetic acid
2) Ascorbic acid
3) Citric acid
4) Tartaric acid
Q. Which of the following atmospheric gases constitute greenhouse gases?
1. Carbon dioxide
2. Nitrogen
3. Nitrous oxide
4. Water vapour
Select the correct answer using the codes given below:
1) 1 and 4
2) 1 and 3
3) 1, 2 and 4
4) 1, 3 and 4
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