Q. Which one of the following statements is NOT correct?
1) Biomass is a renewable source of energy
2) Gobar gas is produced when cow dung, crop residues, vegetable waste, and sewage are allowed to decompose in the absence of oxygen
3) Biogas generation reduces soil and water pollution
4) The heating capacity of biogas is very low
Q. The atomic mass of an element is equal to the sum of the number of -
1) electrons and protons only
2) protons and neutrons only
3) electrons and neutrons only
4) electrons, protons and neutrons
Q. Neutrons were discovered by -
1) James Chadwick
2) Ernest Rutherford
3) J. J. Thomson
4) John Dalton
Q. Vinegar is also known as -
1) Ethanoic acid
2) Nitric acid
3) Sulphuric acid
4) Tartaric acid
Q. The number of maximum electrons in N Shell is -
1) 2
2) 8
3) 18
4) 32
Q. Chalk and marble are different forms of -
1) Calcium hydrogen carbonate
2) Calcium carbonate
3) Calcium acetate
4) Sodium carbonate
Q. Which of the following is an allotrop of the carbon?
I. Buckminsterfullerence
II. Diamond
III. Graphite
The correct code is -
1) Only III
2) Only I and II
3) Only II and III
4) All I, II and III
Q. Which of the following metal(s) is/are stored under kerosene oil ?
I. Sodium
II. Potassium
III. Magnesium
IV. Calcium
The correct code is -
1) Only I and III
2) Only II and IV
3) Only I and II
4) Only I, II and III
Q. An indicator is a 'dye' that changes colour when it is put into an acid or a base which of the following is/are indicators?
I. Litmus
II. Methyl Orange
III. Phenolphthalein
IV. Hydrogen Sulphide
The correct code is -
1) Only I, II and III
2) Only l
3) Only I and II
4) Only I, III and IV
Q. Which of the following is not a chemical reaction?
1) Burning of magnesium ribbon in air
2) Freezing of a lake in winter
3) Ripening of fruits
4) Formation of a precipitate
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