General Science Practice Set-1

Potassium Permanganate is used for purifying drinking water, because
A. It is a sterilising agent.

B. It dissolves the impurities of water.

C. It is a reducing agent.

D. It is an oxidising agent.

Answer: Option D

Explanation: Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water. It can also be used to control iron bacteria growth in wells.

Permanent hardness of water can be removed by adding:
A. Chlorine

B. Washing Soda

C. Potassium Permanganate

D. Bleaching Powder

Answer: Option B

Temporary hardness is due to presence of soluble bicarbonates of calcium and magnesium and permanent hardness is due to the presence of chlorides and sulphate of calcium and magnesium.

Fathom is the unit of
A. Sound

B. Depth

C. Frequency

D. Distance

Answer: Option B

Explanation: A fathom is a unit of length in the imperial and the U.S. customary systems equal to 72 inches (1,828.8000 mm), used especially for measuring the depth of water.[1] The fathom is neither an International Standard (SI) unit, nor an internationally-accepted non-SI unit. Historically, however, it is the most frequently employed maritime measure of depth in the English-speaking world.

One fathom is equal to
A. 6 feet

B. 6 meters

C. 60 feet

D. 100 cm

Answer: Option A

Decibel is the unit for
A. Speed of light

B. Radio wave frequency

C. Intensity of sound

D. Intensity of heat

Answer: Option C

Explanation: The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale.

Reading of a barometer going down is an indication of
A. Snow

B. Storm

C. Intense heat

D. Rainfall

Answer: Option D

What is the unit for measuring the amplitude of a sound?
A. Decibel

B. Coulomb

C. Hum

D. Cycles

Answer: Option A

Amalgams are
A. Highly coloured alloys

B. Alloys which contain mercury as one of the contents

C. Alloys which have great resistance to abrasion

D. Alloys which contain carbon

Answer: Option B

Which of the following is the lightest metal?
A. Mercury

B. Lithium

C. Lead

D. Silver

Answer: Option B

Which of the following metals remain in liquid for under normal conditions?
A. Radium

B. Zinc

C. Uranium

D. Mercury

Answer: Option D

Which of the following is an element?
A. Ruby

B. Sapphire

C. Emerald

D. Diamond

Answer: Option D

General Science Practice

The main constituents of pearls are
A. Calcium Oxide and Ammonium Chloride

B. Calcium Carbonate and Magnesium Carbonate

C. Aragonite and Conchiolin

D. Ammonium Sulphate and Sodium Carbonate.

LPG consists of mainly:
A. Methane, Ethane and Hexane

B. Ethane, Hexane and Nonane

C. Methane, Hexane and Nonane

D. Methane, Butane and Propane

Answer: Option D

Explanation: Liquefied Petroleum Gas or LPG consists mainly of methane, propane, propylene, butane, and butylene in various mixtures. It is produced as a by-product of natural gas processing and petroleum refining. The components of LPG are gases at normal temperatures and pressures.

Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?
A. Television

B. Refrigerator

C. Tube light

D. Cooking gas

Answer: Option B

Explanation: Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in refrigerator.

Balloons are filled with
A. Nitrogen

B. Helium

C. Oxygen

D. Argon

Answer: Option B

Explanation: A balloon is a flexible bag that can be inflated with a gas, such as helium, hydrogen, nitrous oxide, oxygen, and air.

Which of the following does not contain a coinage metal?
A. Silver and Gold

B. Zinc and Gold

C. Copper and Silver

D. Copper and Gold

Answer: Option B

The filament of an electric bulb is made of
A. Tungsten

B. Nichrome

C. Graphite

D. Iron

Answer: Option A

Diamond is an allotropic form of:
A. Germanium

B. Carbon

C. Silicon

D. Sulphur

Answer: Option B

In fireworks, the green flame is produced because of
A. Sodium

B. Barium

C. Mercury

D. Potassium

Answer: Option B

Marsh gas is
A. Nitrogen

B. Ethane

C. Methane

D. Hydrogen

Answer: Option C

General Science Practice

The two elements that are frequently used for making transistors are
A. Boron and Aluminium

B. Silicon and Germanium

C. Iridium and Tungsten

D. Niobium and Columbium

Answer: Option B

Actinides are the elements with atomic numbers from
A. 97 to 104

B. 101 to 115

C. 89 to 103

D. 36 from 43

Answer: Option C

What is laughing gas?
A. Nitrous Oxide

B. Carbon monoxide

C. Sulphur dioxide

D. Hydrogen peroxide

Answer: Option A

Which of the following are the ingredients of gun metal?
A. Iron, Zinc and Titanium

B. Iron and Tin

C. Iron, Brass and Tin

D. Copper, Tin and Zinc

Answer: Option D

From which mineral is radium obtained?
A. Rutile

B. Haematite

C. Limestone

D. Pitchblende

Answer: Option D

The most important ore of aluminum is
A. Galena

B. Calamine

C. Calcite

D. Bauxite

Answer: Option D

Which of the following was to be discovered first in the chromospheres of the sun?
A. Krypton

B. Xenon

C. Neon

D. Helium

Answer: Option D

Which of the following is in liquid form at room temperature?
A. Lithium

B. Sodium

C. Francium

D. Cerium

Answer: Option C

Sodium metal is kept under:
A. Petrol

B. Alcohol

C. Water

D. Kerosene

Answer: Option D

Soda water contains
A. Carbonic acid

B. Sulphuric acid

C. Carbon dioxide

D. Nitrous acid

Answer: Option A

General Science Practice

Explanation: Carbonated water or Soda water is water that has been infused with carbon dioxide gas under pressure. It is carbonic acid. This produces a bubbly drink that’s also known as sparkling water, club soda, soda water, seltzer water and fizzy water. With the exception of seltzer water, they usually have salt added to improve the taste.

Permanent hardness of water may be removed by the addition of:
A. Sodium Carbonate

B. Alum

C. Potassium Permanganate

D. Lime

Answer: Option A

Explanation: Temporary hardness can be removed by boiling or by addition of Ca(OH)2. Permanent hardness can be removed by the addition of washing soda commonly known as sodium carbonate.

Potassium nitrate is used in
A. Medicine

B. Fertilizer

C. Salt

D. Glass

Answer: Option B

Carbon, diamond and graphite are together called:
A. Allotrope

B. Isomers

C. Isomorphs

D. Isotopes

Answer: Option A

Monazite is an ore of
A. Titanium

B. Zirconium

C. Iron

D. Thorium

Answer: Option D

Non stick cooking utensils are coated with
A. Black paint


C. Teflon

D. polystyrene

Answer: Option C

The element common to all acids is
A. Hydrogen

B. Carbon

C. Sulphur

D. Oxygen

Answer: Option A

The chemical (Ethyl Mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of:
A. Bromine

B. Fluorine

C. Chlorine

D. Sulphur

Answer: Option D

Heavy water is:
A. Deuterium oxide

B. PH7

C. Rain water

D. Tritium oxide

Answer: Option A

The group of metals Fe, Co, Ni may best called as:
A. Transition metals

B. Main group metals

C. Alkali metals

D. Rare metals

Answer: Option A

In which of the following activities silicon carbide is used?
A. Making cement and glass

B. Disinfecting water of ponds

C. Cutting very hard substances

D. Making casts for statues

Answer: Option C

The average salinity of seawater is
A. 3%

B. 3.5%

C. 2.5%

D. 2%

Answer: Option B

General Science Practice

When an iron nail gets rusted, iron oxide is formed
A. Without any change in the weight of the nail

B. With decrease in the weight of the nail

C. With increase in the weight of the nail

D. Without any change in colour or weight of the nail

Answer: Option C

Galvanised iron sheets have a coating of
A. Lead

B. Chromium

C. Zinc

D. Tin

Answer: Option C

Among the various allotrope of carbon
A. Coke is the hardest, graphite is the softest

B. Diamond is the hardest, coke is the softest

C. Diamond is the hardest, graphite is the softest

D. Diamond is the hardest, lamp black is the softest

Answer: Option C

The property of a substance to absorb moisture from the air on exposure is called
A. Osmosis

B. Deliquescence

C. Efflorescence

D. Desiccation

Answer: Option B

The gases used in different types of welding would include
A. Oxygen and Hydrogen

B. Oxygen, Hydrogen, Acetylene and Nitrogen

C. Oxygen, Acetylene and Argon

D. Oxygen and Acetylene

Answer: Option D

The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
A. Argon

B. Xenon

C. Helium

D. Krypton

Answer: Option C

Which of the following is used as a lubricant?

A. Graphite

B. Silica

C. Iron Oxide

D. Diamond

Answer: Option A

Tetraethyl lead is used as
A. Pain Killer

B. Fire Extinguisher

C. Mosquito Repellent

D. Petrol Additive

Answer: Option D

Quartz crystals normally used in quartz clocks etc. is chemically
A. Silicon Dioxide

B. Germanium Oxide

C. A mixture of Germanium Oxide and Silicon dioxide

D. Sodium Silicate

Answer: Option A

Which of the gas is not known as green house gas?
A. Methane

B. Nitrous oxide

C. Carbon dioxide

D. Hydrogen

Answer: Option D

Bromine is a
A. Black Solid

B. Red Liquid

C. Colourless Gas

D. Highly Inflammable Gas

Answer: Option B

The hardest substance available on earth is
A. Gold

B. Iron

C. Diamond

D. Platinum

Answer: Option C

The variety of coal in which the deposit contains recognizable traces of the original plant material is
A. Bitumen

B. Anthracite

C. Lignite

D. Peat

Answer: Option D

Which of the following is used in pencils?
A. Graphite

B. Silicon

C. Charcoal

D. Phosphorous

Answer: Option A

Which of the following metals forms an amalgam with other metals?
A. Tin

B. Mercury

C. Lead

D. Zinc

Answer: Option B

The gas usually filled in the electric bulb is
A. Nitrogen

B. Hydrogen

C. Carbon dioxide

D. Oxygen

Answer: Option A

Washing soda is the common name for
A. Sodium Carbonate

B. Calcium Bicarbonate

C. Sodium Bicarbonate

D. Calcium Carbonate

Answer: Option A

The tree which sends down roots from its branches to the soil is known as:
A. Oak

B. Pine

C. Banyan

D. Palm

Answer: Option C

Electric bulb filament is made of
A. Copper

B. Aluminum

C. Lead

D. Tungsten

Answer: Option D

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

B. Hydrogen Sulphide

C. Carbon dioxide

D. Nitrogen

Answer: Option B

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

B. Bromine

C. Chlorine

D. Helium

Answer: Option B

Chlorophyll is a naturally occurring chelate compound in which central metal is
A. Copper

B. Magnesium

C. Iron

D. Calcium

Answer: Option B