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GK MCQs

Science MCQs

Science MCQs
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Brass is a mixture of which two metals?

  1. Nickel and Copper
  2. Copper and Zinc -
  3. Copper and Lead
  4. Tin and Lead

Brass gets discoloured in air because of the presence of which of the following gases in air?

  1. Oxygen
  2. Hydrogen sulphide -
  3. Carbon dioxide
  4. Nitrogen

Bromine is a

  1. black solid
  2. red liquid -
  3. colourless gas
  4. highly inflammable gas

Chemical formula for water is

  1. NaAlO2
  2. H2O -
  3. Al2O3
  4. CaSiO3

Chlorophyll is a naturally occurring chelate compound in which central metal is

  1. Copper
  2. Magnesium -
  3. Iron
  4. Calcium

Ecology deals with

  1. Birds
  2. Cell formation
  3. Relation between organisms and their environment -
  4. Tissues

Energy is measured in the same units as

  1. Motion
  2. Work -
  3. Efficiency
  4. Power

Entomology is the science that studies [CMAT 2020]

  1. The origin and history of technical and scientific terms
  2. Behavior of human beings
  3. Insects -
  4. The formation of rocks

For galvanizing iron which of the following metals is used?

  1. Aluminium
  2. Copper
  3. Lead
  4. Zinc -

For purifying drinking water alum is used

  1. for coagulation of mud particles -
  2. to kill bacteria
  3. to remove salts
  4. to remove gases

For seeing objects at the surface of water from a submarine under water, the instrument used is

  1. Kaleidoscope
  2. Periscope -
  3. Spectroscope
  4. Telescope

Friction can be reduced by changing from

  1. rolling to sliding
  2. sliding to rolling -
  3. dynamic to static
  4. potential energy to kinetic energy

How many Dynes are there in 1 gram weight?

  1. 900
  2. 375
  3. 981 -
  4. 250

How many Ergs are there in 1 joule?

  1. 10²
  2. 10⁴
  3. 10⁶
  4. 10⁷ -

If force is expressed in Newton and the distance in metre, then the work done is expressed in

  1. Joule -
  2. Kg wt
  3. Kg wt m
  4. Watt

If speed of rotation of the earth increases, weight of the body

  1. increases
  2. remains unchanged
  3. decreases -
  4. may decrease or increase

Quartz crystals normally used in quartz clocks etc. is chemically

  1. Silicon dioxide -
  2. Germanium oxide
  3. A mixture of germanium oxide and silicon dioxide
  4. Sodium silicate

Stainless steels which are resistant to corrosion and oxidation typically needs [CMAT 2023]

  1. Copper
  2. Chromium -
  3. Silver
  4. Zinc

The approximate velocity of light is

  1. 3×10⁶ m/s
  2. 3×10⁸ m/s -
  3. 3×10¹⁰ m/s
  4. 3×10¹² m/s

The gas usually filled in the electric bulb is

  1. Nitrogen -
  2. Hydrogen
  3. Carbon dioxide
  4. Oxygen

The hardest substance available on earth is

  1. Gold
  2. Iron
  3. Diamond -
  4. Platinum

Washing soda is the common name for

  1. Sodium carbonate -
  2. Calcium bicarbonate
  3. Sodium bicarbonate
  4. Calcium carbonate

What is laughing gas?

  1. Nitric oxide
  2. Nitrogen oxide
  3. Nitrogen
  4. Nitrous oxide -

What is the chemical name of common salt?

  1. Potassium Carbonate
  2. Sodium Chloride -
  3. Sodium Carbonate
  4. Sodium Bicarbonate

Which of the following is a non metal that remains liquid at room temperature?

  1. Phosphorous
  2. Bromine -
  3. Chlorine
  4. Helium

Which of the following is the most elastic?

  1. Rubber -
  2. Glass
  3. Carbon
  4. Paper

Which of the following is used in pencils?

  1. Graphite -
  2. Silicon
  3. Charcoal
  4. Phosphorous

Which of the gas is not known as green house gas?

  1. Methane
  2. Nitrous oxide
  3. Carbon dioxide
  4. Hydrogen

Answer: (d) water vapor, carbon dioxide, methane, nitrous oxide, ozone, chlorofluorocarbons are green house gases.

Which of the following metals forms an amalgam with other metals?

  1. Tin
  2. Mercury -
  3. Lead
  4. Zinc

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