Q. Which of the following elements is a semi-conductor ?
1) Aluminium
2) Silicon
3) Silver
4) Lead
Q. Which of the following is the main component of the natural gas ?
1) Ethane
2) Butane
3) Carbon monoxide
4) Methane
Q. Which of the following countries was the largest emitter of CO2 in 2015 ?
1) China
2) USA
3) India
4) France
Q. Which of the following is the richest source of Vitamin C ?
1) Orange
2) Apple
3) Carrot
4) Amla
Q. Graphene is -
1) An alloy of carbon
2) Nano structure of carbon
3) Isotope of carbon
4) None of the above
Q. Which of the following properties is true for a tooth paste ?
1) It is acidic
2) It is neutral
3) It is basic
4) It is made up of Calcium phosphate, the material of tooth enamel
Q. Which one of the following gives the highest amount of hydrogen ions (H+) ?
1) Sodium hydroxide solution
2) Milk of magnesia
3) Lemon juice
4) Gastric juice
Q. Which one of the following metals is alloyed with sodium to transfer heat in a nuclear reactor ?
1) Potassium
2) Calcium
3) Magnesium
4) Strontium
Q. Brine is an aqueous solution of -
1) NaC1
2) NaOH
3) NaHCO3
4) Na2C03
Q. Which one of the following is NOT true for bleaching powder ?
1) It is used as a reducing agent in chemical industries
2) It is used for bleaching wood pulp in paper factories
3) It is used for disinfecting drinking water
4) It is used for bleaching linen in textile industry
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