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Chemistry - General Science Solved Questions and Answers for Competitive Exams

21 The element that is in the highest percentage in the composition of the earth :
A Silicon
B Oxygen
C Magnesium
D Iron

Answer: Option [B]
22 Which are the fundamental particles present in the nucleus of an atom ?
A Electron, proton
B Proton, neutron
C Neutron, electron
D Neutron, positron

Answer: Option [B]
23 Which of the following alkali metals has highest specific heat ?
A Caesium
B Rubidium
C Potassium
D Lithium

Answer: Option [D]
24 What are the metallic constituents of hard water ?
A Magnesium, calcium and tin
B Iron, tin and calcium
C Calcium, magnesium and iron
D Magnesium, tin and iron

Answer: Option [C]
25 Which of the following imparts deep blue colour to glass ?
A Cobalt oxide
B Cupric oxide
C Phosphorus
D Nickel oxide

Answer: Option [A]


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