Brass is a mixture of which two metals?
- Nickel and Copper
- Copper and Zinc -
- Copper and Lead
- Tin and Lead
Brass gets discoloured in air because of the presence of which of the following gases in air?
- Oxygen
- Hydrogen sulphide -
- Carbon dioxide
- Nitrogen
Bromine is a
- black solid
- red liquid -
- colourless gas
- highly inflammable gas
Chemical formula for water is
- NaAlO2
- H2O -
- Al2O3
- CaSiO3
Chlorophyll is a naturally occurring chelate compound in which central metal is
- Copper
- Magnesium -
- Iron
- Calcium
Ecology deals with
- Birds
- Cell formation
- Relation between organisms and their environment -
- Tissues
Energy is measured in the same units as
- Motion
- Work -
- Efficiency
- Power
Entomology is the science that studies [CMAT 2020]
- The origin and history of technical and scientific terms
- Behavior of human beings
- Insects -
- The formation of rocks
For galvanizing iron which of the following metals is used?
- Aluminium
- Copper
- Lead
- Zinc -
For purifying drinking water alum is used
- for coagulation of mud particles -
- to kill bacteria
- to remove salts
- to remove gases
For seeing objects at the surface of water from a submarine under water, the instrument used is
- Kaleidoscope
- Periscope -
- Spectroscope
- Telescope
Friction can be reduced by changing from
- rolling to sliding
- sliding to rolling -
- dynamic to static
- potential energy to kinetic energy
How many Dynes are there in 1 gram weight?
- 900
- 375
- 981 -
- 250
How many Ergs are there in 1 joule?
- 10²
- 10⁴
- 10⁶
- 10⁷ -
If force is expressed in Newton and the distance in metre, then the work done is expressed in
- Joule -
- Kg wt
- Kg wt m
- Watt
If speed of rotation of the earth increases, weight of the body
- increases
- remains unchanged
- decreases -
- may decrease or increase
Quartz crystals normally used in quartz clocks etc. is chemically
- Silicon dioxide -
- Germanium oxide
- A mixture of germanium oxide and silicon dioxide
- Sodium silicate
Stainless steels which are resistant to corrosion and oxidation typically needs [CMAT 2023]
- Copper
- Chromium -
- Silver
- Zinc
The approximate velocity of light is
- 3×10⁶ m/s
- 3×10⁸ m/s -
- 3×10¹⁰ m/s
- 3×10¹² m/s
The gas usually filled in the electric bulb is
- Nitrogen -
- Hydrogen
- Carbon dioxide
- Oxygen
The hardest substance available on earth is
- Gold
- Iron
- Diamond -
- Platinum
Washing soda is the common name for
- Sodium carbonate -
- Calcium bicarbonate
- Sodium bicarbonate
- Calcium carbonate
What is laughing gas?
- Nitric oxide
- Nitrogen oxide
- Nitrogen
- Nitrous oxide -
What is the chemical name of common salt?
- Potassium Carbonate
- Sodium Chloride -
- Sodium Carbonate
- Sodium Bicarbonate
Which of the following is a non metal that remains liquid at room temperature?
- Phosphorous
- Bromine -
- Chlorine
- Helium
Which of the following is the most elastic?
- Rubber -
- Glass
- Carbon
- Paper
Which of the following is used in pencils?
- Graphite -
- Silicon
- Charcoal
- Phosphorous
Which of the gas is not known as green house gas?
- Methane
- Nitrous oxide
- Carbon dioxide
- 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?
- Tin
- Mercury -
- Lead
- Zinc
We will keep adding more multiple choice questions.