Physical Science
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Q281.Besides chlorine, seawater contains traces of which element?
Correct Answer: C
Besides chlorine (as part of dissolved salts), sea water contains trace amounts of Iodine, which is why seafood is a natural source of dietary iodine.
Q282.Pure limstone is called_____
Correct Answer: B
Pure limestone is composed mainly of Calcium Carbonate (CaCO3).
Q283.Which heating element is most effective?
Correct Answer: C
Nichrome (an alloy of nickel and chromium) is widely used as a heating element due to its high resistance and resistance to oxidation at high temperatures.
Q284.The Third Most abundant element is:
Correct Answer: C
By mass in Earth's crust, after Oxygen and Silicon, Aluminum is the third most abundant element.
Q285.Isotopes of an element have the same number of
Correct Answer: B
Isotopes of an element share the same number of Protons (defining the element) but differ in their number of neutrons.
Q286.Most common element to all perfumes ls
Correct Answer: A
Ethyl Alcohol (ethanol) is the most common solvent base used across nearly all perfumes.
Q287.Name the element which is used to fabricate solar cells and transistors?
Correct Answer: A
Silicon is the primary semiconductor material used to fabricate solar cells and transistors.
Q288.A cooling agent that has lower temperature than water ice, is solid form of _______.
Correct Answer: C
Solid Carbon Dioxide, known as 'dry ice', is colder than water ice and is used as a cooling/refrigerant agent.
Q289.Which gas is commonly used in incandescent light bulbs?
Correct Answer: A
Incandescent bulbs commonly contain argon or an argon–nitrogen mixture.
Q290.Malaria medicine contains which element:
Correct Answer: B
Chloroquine is a well-known antimalarial medicine.