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Chemistry - General Science Short 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]
26 Which of the following elements is non-radioactive ?
A Uranium
B Thorium
C Plutonium
D Zirconium

Answer: Option [D]
27 What is the purest form of iron ?
A Steel
B Cast iron
C Pig iron
D Wrought iron

Answer: Option [D]
28 Which of the following metals form an amalgam with other metals ?
A Lead
B Tin
C Zinc
D Mercury

Answer: Option [D]
29 Which of the following is the main nitrogenous waste in humans ?
A Ammonia
B Urea
C Uric Acid
D Ammonium Nitrate

Answer: Option [C]
30 Drinking soda is :
A Alkaline
B Acidic
C Neutral
D Oxidant

Answer: Option [B]


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