Everyday Science MCQs, Part — 2

General Science 280+ MCQ PDF for SSC CHSL 2019
Imaginary lines are drawn on a global map from pole to pole and from the perpendicular to the Equator is called

(A) Contours

(B) Isobars

(C) Meridians

(D) Steppes

Correct Answer

Answer: Option C
Gravity setting chambers are used in industries to remove

(A) SOX

(B) NOX

(C) Suspended particulate matter

(D) CO

Correct Answer

Answer: Option C
A pond may be referred to as

(A) An artificial eco-system

(B) A natural eco-system

(C) A biome

(D) A community of plants and animals

Correct Answer

Answer: Option B
Fathometer is used to measure

(A) Earthquakes

(B) Rainfall

(C) Ocean depth

(D) Sound intensity

Correct Answer

Answer: Option C
At the equator, the duration of a day is

(A) 10 hrs

(B) 12 hrs

(C) 14 hrs

(D) 16 hrs

Correct Answer

Answer: Option A
The term “Refraction of light” means

(A) Bending of light rays when they enter from one medium to another medium

(B) Bending of light round the corners of obstacles and apertures

(C) Coming back of light from a bright smooth surface

(D) None of these

Correct Answer

Answer: Option A
Fish plates in Railway tracks are used to

(A) Connect two rails

(B) Join two coaches

(C) Guide the wheels

(D) Avoid fishes on the track

Correct Answer

Answer: Option A
On a night when the sky is clear, the temperature may dip considerably; on a cloudy night the temperature will usually dip much less. The reason for this difference is that

(A) The clear sky allows radiant energy to escape readily from the earth

(B) On a cloudy night the clouds are warm and therefore retard the cooling

(C) The clear sky allows the cold of outer space to reach the earth

(D) Current of air carries the heat away from the earth on a clear night

Correct Answer

Answer: Option A
Of the four locations mentioned below the highest inside temperature will be attained in the Pressure cooker operated with the pressure valve open

(A) At sea level

(B) At the top of Mt. Everest

(C) At a place in a valley below sea level

(D) In an airplane flying at a height of 10,000 m with inside pressure maintained at the sea level

Correct Answer

Answer: Option C
Optical fiber works on the principle of

(A) refraction

(B) Total internal reflection

(C) Scattering

(D) Interference

Correct Answer

Answer: Option B
Minimum numbers of unequal vectors which can give zero resultant are

(A) Two

(B) Three

(C) Four

(D) More than four

Correct Answer

Answer: Option B
One should not connect a number of electrical appliances to the same power socket because

(A) This can damage the appliances due to overloading

(B) This can damage the domestic wiring due to overloading

(C) This can damage the electrical meter

(D) The appliance will not get full voltage

Correct Answer

Answer: Option B
It is easier to roll a stone up a sloping road than to lift it vertical upwards because

(A) Work done in rolling is more than in lifting

(B) Work done in lifting the stone is equal to rolling it

(C) Work done in both is the same but the rate of doing work is less in rolling

(D) Work done in rolling a stone is less than in lifting it

Correct Answer

Answer: Option D
Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following the phenomenon of radiation?

(A) Scattering

(B) Diffraction

(C) Interference

(D) Polarization

Correct Answer

Answer: Option A
Mirage is due to

(A) Unequal heating of different parts of the atmosphere

(B) Magnetic disturbances in the atmosphere

(C) Depletion of ozone layer in the atmosphere

(D) Equal heating of different parts of the atmosphere

Correct Answer

Answer: Option A
Sound waves in air are

(A) Transverse

(B) Longitudinal

(C) Electromagnetic

(D) Polarized

Correct Answer

Answer: Option B
Suitable impurities are added to a semiconductor depending on its use. This is done in order to

(A) Increase its life

(B) Enable it to withstand higher voltages

(C) Increase its electrical conductivity

(D) Increase its electrical resistivity

Correct Answer

Answer: Option C
Railway tracks are banked on curves

(A) Necessary centrifugal force may be obtained from the horizontal component weight of the

train

(B) To avoid frictional force between the tracks and wheels

(C) Necessary centripetal force may be obtained from the horizontal component of the weight

of the train

(D) The train may not fly off in the opposite direction

Correct Answer

Answer: Option C
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

(A) 4.2 seconds

(B) 42 seconds

(C) 4.2 years

(D) 42 years

Correct Answer

Answer: Option C
ML2T-2 is the dimensional formula for

(A) Moment of inertia

(B) Pressure

(C) Elasticity

(D) Couple acting on a body

Correct Answer

Answer: Option D

General Science 280+ MCQ PDF for SSC CHSL 2019
Large astronomical telescopes always use as objective

(A) Lens

(B) Mirror

(C) Combinations of lenses

(D) None of the above

Correct Answer

Answer: Option C
It is easier to roll a barrel full of coal tar than to pull it because

(A) The full weight of the barrel comes into play when it is pulled

(B) The rolling friction is much less than the sliding friction

(C) More surface area of the barrel is in contact with the road when it is pulled

(D) Coal tar is a liquid and it flows in the barrel when it is rolled

Correct Answer

Answer: Option B
Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?

(A) 1.8 km, 0.15 km

(B) 2.2 km, 0.20 km

(C) 2.8 km, 0.25 km

(D) 3.3 km, 0.30 km

Correct Answer

Answer: Option D
Siphon will fail to work if

(A) The densities of the liquid in the two vessels are equal

(B) The level of the liquid in the two vessels is at the same height

(C) Both its limbs are of unequal length

(D) The temperature of the liquids in the two vessels is the same

Correct Answer

Answer: Option B
Light from the Sun reaches us in nearly

(A) 2 minutes

(B) 4 minutes

(C) 8 minutes

(D) 16 minutes

Correct Answer

Answer: Option C
On a rainy day, small oil films on water show brilliant colors. This is due to

(A) Dispersion

(B) Interference

(C) Diffraction

(D) Polarization

Correct Answer

Answer: Option B
Inside an airplane, flying at a high altitude

(A) The pressure is the same as that outside

(B) Normal atmospheric pressure is maintained by the use of air pumps

(C) The pressure inside is less than the pressure outside

(D) Normal humidity and partial vacuum are maintained

Correct Answer

Answer: Option B
The 23½° South latitude is known as

(A) The Tropic of Cancer

(B) The Tropic of Capricorn

(C) The Equator

(D) The Prime Meridian

Correct Answer

Answer: Option B
A man weighing 65 kg jumps from a 100 ft high building with a load of 35 kg. What will be the load experienced by him?

(A) 20 kg

(B) 100 kg

(C) 200 kg

(D) Zero

Correct Answer

Answer: Option D
The universal law of gravitation was propounded by

(A) Kepler

(B) Galileo

(C) Newton

(D) Copernicus

Correct Answer

Answer: Option C
Summer solstice occurs in the Southern hemisphere on

(A) December 22

(B) January 22

(C) February 22

(D) February 28

Correct Answer

Answer: Option A
Microphone is used to convert

(A) Sound waves into electrical energy
(B) Sound waves into light rays

(C) Electrical energy into sound waves

(D) Sound waves into magnetic currents

Correct Answer

Answer: Option A
Steel is more elastic than Rubber because

(A) Its density is high

(B) It is a metal

(C) Ratio of stress to strain is more

(D) Ratio of stress to strain is less

Correct Answer

Answer: Option C
Pressure cooker cooks rice faster because

(A) It always lets the steam escape

(B) High pressure crushes the hard covering of rice grains

(C) It does not let the heat energy escape easily

(D) High pressure raises the boiling point of water

Correct Answer

Answer: Option D
The clear sky looks blue because

(A) Reflection of light

(B) Refraction of light

(C) Diffraction of light

(D) Dispersion of light

Correct Answer

Answer: Option D
The main reserves of phosphorus in the biosphere is in the

(A) Hydrosphere

(B) Atmosphere

(C) Lithosphere

(D) Troposphere

Correct Answer

Answer: Option C
The normal threshold of hearing is around

(A) 60-80 db

(B) 45-60 db

(C) 100-120 db

(D) 25-45 db

Correct Answer

Answer: Option D
Ozone hole refers to

(A) Hole in ozone layer

(B) Decrease in the ozone layer in troposphere

(C) Decrease in thickness of ozone layer in stratosphere

(D) Increase in the thickness of ozone layer in troposphere

Correct Answer

Answer: Option C
Super conductivity is a phenomenon in which the resistance of a substance

(A) Increases with temperature

(B) Decreases with temperature

(C) Does not change with temperature

(D) Becomes zero at very low temperature

Correct Answer

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

(A) Kaleidoscope

(B) Periscope

(C) Spectroscope

(D) Telescope

Correct Answer

Answer: Option B

General Science 280+ MCQ PDF for SSC CHSL 2019
If speed of rotation of the earth increases, weight of the body

(A) Increases

(B) Remains unchanged

(C) Decreases

(D) May decrease or increase

Correct Answer

Answer: Option C
The largest planet of the solar system is

(A) Earth

(B) Mars

(C) Jupiter

(D) Saturn

Correct Answer

Answer: Option C
Which is the closest planet to Sun?

(A) Mars

(B) Venus

(C) Jupiter

(D) Mercury

Correct Answer

Answer: Option D
What is the instrument that determines specific gravity of liquids?

(A) Hygrometer

(B) Hydrometer

(C) Gravimeter

(D) Hypsometer

Correct Answer

Answer: Option C
Primitive man first learned

(A) To make fire

(B) To tame animals

(C) To make a wheel

(D) To grow grain

Correct Answer

Answer: Option A
In the visible spectrum, the color having the shortest wavelength is

(A) Green

(B) Yellow

(C) Violet

(D) Blue

Correct Answer

Answer: Option C
On a cold day when room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because

(A) Metals have a higher thermal capacity than plastics

(B) Plastics have a lower density than metals

(C) Metals are a good conductor of heat

(D) Plastics have a higher thermal conductivity than metals

Correct Answer

Answer: Option C
The main source of chemicals which are used in industries is

(A) Coke

(B) Peat

(C) Coal tar

(D) Liquefied Petroleum Gas

Correct Answer

Answer: Option C
Photo-oxidation is

(A) Photorespiration

(B) Photolysis

(C) Light and oxygen induced breakdown

(D) All of the above

Correct Answer

Answer: Option D
Which of the following gases is not a noble gas?

(A) Zenon

(B) Argon

(C) Helium

(D) Chlorine

Correct Answer

Answer: Option D
Liquids transmit pressure equally in all directions. This is known as

(A) Boyle-Pascal’s Law

(B) Pascal’s Law

(C) Archimedes’ Principle

(D) None of the above

Correct Answer

Answer: Option B
Soil is formed from the parent rock material by

(A) Chemical decomposition

(B) Physical decomposition

(C) Biological decomposition

(D) All of the above

Correct Answer

Answer: Option D
The exhaled air contains

(A) Carbon dioxide only

(B) A mixture which has more carbon dioxide than oxygen

(C) A mixture of carbon dioxide, nitrogen and oxygen in which nitrogen has the highest

Percentage

(D) A mixture of carbon dioxide and nitrogen

Correct Answer

Answer: Option C
The refrigerant commonly used for domestic refrigerators is

(A) Alcohol

(B) Ammonia

(C) Neon

(D) None of the above

Correct Answer

Answer: Option B
RDX is

(A) An instrument to measure blood pressure

(B) A gene

(C) A chemical used in the manufacture of fertilisers

(D) An explosive

Correct Answer

Answer: Option D
O2 released in the process of photosynthesis comes from

(A) CO2

(B) Water

(C) Sugar

(D) Pyruvic acid

Correct Answer

Answer: Option B
Which of the following diffuses most quickly?

(A) Solid

(B) Gas

(C) Liquid

(D) None of these

Correct Answer

Answer: Option B
The oldest rocks in the earth’s crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth’s early life and solidified into hard rock’s called

(A) Granite

(B) Basalt

(C) Igneous rocks
(D) Sedimentary rocks

Correct Answer

Answer: Option C
The heat required to raise the temperature of body by 1K is called

(A) Specific heat

(B) Thermal capacity

(C) Water equivalent

(D) None of the above

Correct Answer

Answer: Option B
The Latin word ‘Formica’ means ant. The name formic acid is derived from this Latin word because

(A) This acid, in ancient times, was used to eliminate ant-hills

(B) This corrosive acid is secreted by ants to drive away their enemies

(C) This acid was first obtained by the distillation of ants

(D) Ants are attracted by the odour of this acid

Correct Answer

Answer: Option C
The heat energy produced when the human body metabolises 1 gram of fat is

(A) 30 KJ

(B) 1 KJ

(C) 39 KJ

(D) 29 KJ

Correct Answer

Answer: Option C
The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

(A) 1.568 × 103

(B) 6.023 × 1019

(C) 4.84 × 1017

(D) 6.023 × 1023

Correct Answer

Answer: Option B
The mass number of a nucleus is

(A) Always less than its atomic number

(B) The sum of the number of protons and neutrons present in the nucleus

(C) Always more than the atomic weight

(D) A fraction

Correct Answer

Answer: Option B
The method that cannot be used for removing permanent hardness of water is

(A) Adding sodium carbonate

(B) Distillation

(C) Adding caustic soda

(D) Boiling

Correct Answer

Answer: Option D
The molecule which has the highest percentage of ionic character among the following is

(A) HI

(B) HF

(C) HCI

(D) HBr

Correct Answer

Answer: Option B
The ionization energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

(A) 5x/36

(B) 5x

(C) 7.2 x

(D) x/6

Correct Answer

Answer: Option A
The mineral containing both magnesium and calcium is

(A) Magnesite

(B) Calcite

(C) Carnallite

(D) Dolomite

Correct Answer

Answer: Option D
Lime is sometimes applied to soil in order to

(A) Increase the alkalinity of the soil

(B) Increase the acidity of the soil

(C) Restore nitrates to the soil

(D) Make the soil more porous

Correct Answer

Answer: Option A
Which of the following chemicals is useful in photography?

(A) Aluminium hydroxide

(B) Potassium nitrate
(C) Silver bromide

(D) Sodium chloride

Correct Answer

Answer: Option C
Water is a good solvent of ionic salts because

(A) It has a high boiling point

(B) It has a high dipole moment

(C) It has a high specific heat

(D) It has no colour

Correct Answer

Answer: Option B
Ordinary table salt is sodium chloride. What is baking soda?

(A) Potassium chloride

(B) Potassium carbonate

(C) Potassium hydroxide

(D) Sodium bicarbonate

Correct Answer

Answer: Option D
What does happen when water is condensed into ice?

(A) Heat is absorbed

(B) Heat is released

(C) Quantity of heat remains unchanged

(D) None of these

Correct Answer

Answer: Option A
The air we inhale is a mixture of gases. Which of the following gases in the mixture is highest in

percentage?

(A) Carbon dioxide

(B) Nitrogen

(C) Oxygen

(D) Ozone

Correct Answer

Answer: Option B
The chief constituent of gobbar (cow dung) gas is

(A) Ethane

(B) Methane

(C) Hydrogen

(D) Carbon dioxide

Correct Answer

Answer: Option B
The reaction which converts sugar solution into alcohol is an example of

(A) Saponification

(B) Hydrogenation

(C) Fermentation

(D) Hydrolysis

Correct Answer

Answer: Option C
In which of the following pairs, the two substances forming the pair are chemically most dissimilar?

(A) Sugar and paper

(B) Butter and paraffin wax

(C) Chalk and marble

(D) Charcoal and diamond

Correct Answer

Answer: Option B
The agent which is oxidized in photosynthesis is

(A) Sunlight

(B) Carbon dioxide

(C) Water

(D) Chlorophyll

Correct Answer

Answer: Option D
The following are the half-lives of four active isotopes. Which one of the following is the most dangerous to handle?

(A) 3 billion years

(B) 100 years

(C) 0.01 minute

(D) 13 days

Correct Answer

Answer: Option C
The high reactivity of fluorine is due to

(A) Its high electro negativity

(B) The small size of fluorine atom

(C) Availability of d-orbitals

(D) Strong F – F bond

Correct Answer

Answer: Option A
The metal does not give H2 on treatment with dilute HCL is

(A) Zn
(B) Fe

(C) Ag

(D) Ca

Correct Answer

Answer: Option C

General Science 280+ MCQ PDF for SSC CHSL 2019
The maximum number of isomers for an alkene with molecular formula C4H8 is

(A) 5

(B) 4

(C) 2

(D) 3

Correct Answer

Answer: Option B
The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is

(A) Carbon

(B) Hydrogen

(C) Oxygen

(D) Nitrogen

Correct Answer

Answer: Option C
The number of atoms present in 21.6 gram of silver (atomic weight = 108) is the same as the molecules in

(A) 1.8 gram of H2O

(B) 12 moles of KMnO4

(C) 0.6 N H2SO4

(D) 4.6 gram of C2H5OH

Correct Answer

Answer: Option B
The formula C6H5-CO-CH3 represents

(A) Acetone

(B) Acetic acid

(C) Acetophenone

(D) Phenyl acetate

Correct Answer

Answer: Option C
The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of

(A) Atomic structure

(B) Metallurgy

(C) Periodic table of contents
(D) Discovery of elements

Correct Answer

Answer: Option C
The metal that is used as a catalyst in the hydrogenation of oils is

(A) Ni

(B) Pb

(C) Cu

(D) Pt

Correct Answer

Answer: Option A
The number of moles of solute present in 1 kg of a solvent is called its

(A) Molality

(B) Molarity

(C) Normality

(D) Formality

Correct Answer

Answer: Option A
Nowadays many novel chemicals are being synthesized termed as xenobiotics. The unique feature of these is what they are
I. Biodegradable

II. Non-biodegradable

III. Pose on the environmental threat

IV. They are environment-friendly

(A) I, III

(B) II, III

(C) I, III, IV

(D) II, III, IV

Correct Answer

Answer: Option B
Soil acidity is generally corrected by

(A) Proper irrigation

(B) Adding sodium hydroxide

(C) Liming

(D) Application of fertilizers

Correct Answer

Answer: Option C
Recently lead free petrol was introduced in our country because

(A) They are not needed now as anti-knock agents

(B) They tower the efficiency of the engine

(C) They cause less pollution
(D) To reduce the cost of petrol

Correct Answer

Answer: Option C
Sulphur is not present in

(A) Iron pyrites

(B) Gypsum

(C) Coal

(D) Chlorapatite

Correct Answer

Answer: Option D
The frequency of which of the following is the highest?

(A) Gamma rays

(B) Light waves

(C) Micro waves

(D) Radio waves

Correct Answer

Answer: Option A
The purest form of water can be obtained from

(A) A deep tube-well

(B) A running stream

(C) A hot water spring

(D) A heavy shower of rain

Correct Answer

Answer: Option D
The main use of salt in the diet is to

(A) Make the taste of food better

(B) Produce in small amounts the hydrochloric acid required for the digestion of food

(C) Ease the process of cooking

(D) Increase the solubility of food particles in water

Correct Answer

Answer: Option B
The oil used in the froth floatation process is

(A) Coconut oil

(B) Olive oil

(C) Kerosene oil

(D) Pine oil

Correct Answer

Answer: Option D
The material which can be deformed permanently by heat and pressure is called a(A) Thermoplastic

(B) Thermoset

(C) Chemical compound

(D) Polymer

Correct Answer

Answer: Option B
The ionic radii of N3-, O2-, F- and Na+ follows the order

(A) N3- > O2- > F- > Na+

(B) N3- > Na+ > O2- > F-

(C) Na+ > O2- > N3- > F-

(D) O2- > F- > Na+ > N3-

Correct Answer

Answer: Option A
The metal used to recover copper from a solution of copper sulphate is

(A) Na

(B) Ag

(C) Hg

(D) Fe

Correct Answer

Answer: Option D
The main buffer system of the human blood is

(A) H2CO3 – HCO3

(B) H2CO3 – CO32-

(C) CH3COOH – CH3COO-
(D) NH2CONH2 – NH2CONH+

Correct Answer

Answer: Option A
The octane number of zero is assigned to

(A) 2-methyl octane

(B) n-heptane

(C) iso-octane

(D) 3-methyl octane

Correct Answer

Answer: Option B
The nuclear particles which are assumed to hold the nucleons together are

(A) Electrons

(B) Positrons

(C) Neutrons

(D) Mesons

Correct Answer

Answer: Option D
The number of waves in n × 10th Bohr’s orbit are

(A) n2

(B) n

(C) n-2

(D) n3

Correct Answer

Answer: Option B
The gas used for artificial ripening of green fruit is

(A) Ethylene

(B) Ethane

(C) Carbon dioxide

(D) Acetylene

Correct Answer

Answer: Option A
The number of g-molecule of oxygen in 6.02 × 1024CO molecules is

(A) 1 gram of molecule

(B) 0.5 gram of molecule

(C) 5 gram of molecule

(D) 10 gram of molecule

Correct Answer

Answer: Option C
The number of electrons presents in H+ is

(A) Zero

(B) One

(C) Two

(D) Three

Correct Answer

Answer: Option A
The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3

(A) 4

(B) 5

(C) 2

(D) 0

Correct Answer

Answer: Option A
The method of concentrating the ore which makes use of the difference in density between ore

and impurities is called

(A) Liquation(B) Leaching

(C) Levigation

(D) Magnetic separation

Correct Answer

Answer: Option C
The metallurgical process in which a metal is obtained in a fused state is called

(A) Smelting

(B) Roasting

(C) Calcinations

(D) Froth floatation

Correct Answer

Answer: Option A
The most commonly used bleaching agent is

(A) Alcohol

(B) Carbon dioxide

(C) Chlorine

(D) Sodium chlorine

Correct Answer

Answer: Option C
The ore which is found in abundance in India is

(A) Monazite

(B) Fluorspar

(C) Bauxite

(D) Magnetite

Correct Answer

Answer: Option A
The mass of one Avogadro number of helium atom is

(A) 1.00 gram

(B) 4.00 gram

(C) 8.00 gram

(D) 4 × 6.02 × 1023 gram

Correct Answer

Answer: Option B
The hydronium ion is

(A) H+

(B) HO-

(C) H +

(D) H3O+

Correct Answer

Answer: Option D
The most extensive, commercially useful source of thorium as monazite sand occurs in India at

(A) Orissa coast

(B) Travancore coast

(C) West Bengal coast

(D) Gujarat coast

Correct Answer

Answer: Option B
The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is

(A) Chain isomerism

(B) Functional group isomerism

(C) Positional isomerism

(D) Metamerism

Correct Answer

Answer: Option C
The mass number of an atom is equal to

(A) The number of protons

(B) The number of protons and electrons

(C) The number of nucleons

(D) The number of neutrons

Correct Answer

Answer: Option C
The molecular formula of phosphorous is

(A) P1

(B) P2

(C) P3

(D) P4

Correct Answer

Answer: Option D
The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is

(A) Dalton’s law

(B) Gay Lussac’s law

(C) Henry’s law

(D) Raoult’s law

Correct Answer

Answer: Option C
The gas present in the stratosphere which filters out some of the sun’s ultraviolet light and provides an effective shield against radiation damage to living things is

(A) Helium

(B) Ozone

(C) Oxygen

(D) Methane

Correct Answer

Answer: Option B
What are the numbers of moles of CO which contains 16 g of oxygen?

(A) 0.5 mole

(B) 0.2 mole

(C) 0.4 mole

(D) 0.25 mole

Correct Answer

Answer: Option A
The inexpensive and commonly used variety of glass is called soda glass. It is called so because

(A) Was used initially for making bottles of soda(carbonated drink)

(B) Is made using soda(sodium carbonate)

(C) Was initially used for storing sodium carbonate

(D) Is made using soda lime

Correct Answer

Answer: Option B

General Science 280+ MCQ PDF for SSC CHSL 2019
The iron ore magnetite consists of

(A) Fe2O3

(B) Fe3OH4

(C) FeCO3

(D) 3Fe2O3 & 3H2O

Correct Answer

Answer: Option A
The most important ore of aluminum is

(A) Bauxite

(B) Magnetite

(C) Hematite

(D) Monazite

Correct Answer

Answer: Option A
The National Chemical Laboratory (INDIA) is situated in

(A) New Delhi
(B) Bangalore

(C) Pune

(D) Patna

Correct Answer

Answer: Option C
The main active constituent of tea and coffee is

(A) Nicotine

(B) Chlorophyll

(C) Caffeine

(D) Aspirin

Correct Answer

Answer: Option C
Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be

(A) 2 : 16 : 2

(B) 2 : 16 : 1

(C) 1 : 16 : 2

(D) 1 : 1 : 1

Correct Answer

Answer: Option C
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of

(A) p-electrons in Ne (Z = 10)

(B) s-electrons in Mg (Z = 12)

(C) d-electrons in Fe (Z = 26)

(D) p-electrons in CI (Z = 17)

Correct Answer

Answer: Option D
The inherited traits of an organism are controlled by

(A) RNA molecules

(B) Nucleotides

(C) DNA molecules

(D) Enzymes

Correct Answer

Answer: Option C
The items amenable to detection by soft x-rays are

(A) Contrabands

(B) Lead in bullets

(C) Narcotics

(D) Genuine coins from counterfeit coins

Correct Answer

Answer: Option D
Zone refining is used for the purification of

(A) Au

(B) Ge
(C) Ag

(D) Cu

Correct Answer

Answer: Option B
The hardest form of carbon is

(A) Coke

(B) Graphite

(C) Diamond

(D) Charcoal

Correct Answer

Answer: Option C
The inert gases are _________ in water

(A) Sparingly soluble

(B) Insoluble

(C) Soluble

(D) None of these

Correct Answer

Answer: Option A
The most electronegative element among the following is

(A) Sodium

(B) Bromine

(C) Fluorine

(D) Oxygen

Correct Answer

Answer: Option C
The luster of a metal is due to

(A) Its high density

(B) Its high polishing

(C) Its chemical inertness

(D) Presence of free electrons

Correct Answer

Answer: Option D
The organic reaction represented by equation CH3 – CH = O + H2NOH gives CH3 – CH – NH + H2O is an example of

(A) An addition reaction

(B) A condensation reaction

(C) An oxidation reaction

(D) An elimination reaction

Correct Answer

Answer: Option B
The nucleus of an atom consists of

(A) Electrons and neutrons

(B) Electrons and protons

(C) Protons and neutrons

(D) All of the above

Correct Answer

Answer: Option C
The most abundant rare gas in the atmosphere is

(A) He

(B) Ne

(C) Ar

(D) Xe

Correct Answer

Answer: Option C
The first metal used by man was

(A) Iron

(B) Copper

(C) Gold

(D) Bronze

Correct Answer

Answer: Option B
The molecules of which gas have highest speed?

(A) H2 at -73°C

(B) CH4 at 300 K

(C) N2 at 1,027°C

(D) O2 at 0°C

Correct Answer

Answer: Option A
The nucleus of a hydrogen atom consists of

(A) 1 proton only

(B) 1 proton + 2 neutrons

(C) 1 neutron only

(D) 1 electron only

Correct Answer

Answer: Option A
The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is

(A) 2.05 gram

(B) 3.05 gram

(C) 4.05 gram
(D) 5.05 gram

Correct Answer

Answer: Option B
The monomer of polythene is

(A) Vinyl chloride

(B) Ethylene

(C) Ethyl alcohol

(D) None of the above

Correct Answer

Answer: Option B
The most malleable metal is

(A) Platinum

(B) Silver

(C) Iron

(D) Gold

Correct Answer

Answer: Option D
The gas used in the manufacture of vegetable oil from vegetable is

(A) Hydrogen

(B) Oxygen

(C) Nitrogen

(D) Carbon dioxide

Correct Answer

Answer: Option A
The most electropositive elements among the following is

(A) Na

(B) Ca

(C) K

(D) Cs

Correct Answer

Answer: Option D
The main chemical constituent of the oil of cardamom which is responsible for flavor of this oil is

(A) Cineole

(B) Engenol

(C) Geraniol

(D) Limonene

Correct Answer

Answer: Option A
The major constituent of air is
(A) Nitrogen

(B) Carbon dioxide

(C) Oxygen

(D) Hydrogen

Correct Answer

Answer: Option A
The main chemical constituent of clay is

(A) Silicon oxide

(B) Aluminium borosilicate

(C) Zeolites

(D) Aluminium silicate

Correct Answer

Answer: Option D
Most commonly used bleaching agent is

(A) Alcohol

(B) Carbon dioxide

(C) Chlorine

(D) Sodium chloride

Correct Answer

Answer: Option C
The electron was first identified by

(A) J. J. Thompson

(B) J. Kepler

(C) D. Rutherford

(D) James Chadwick

Correct Answer

Answer: Option A
For purifying drinking water alum is used

(A) For coagulation of mud particles

(B) To kill bacteria

(C) To remove salts

(D) To remove gases

Correct Answer

Answer: Option A

General Science 280+ MCQ PDF for SSC CHSL 2019
Which is the future fuel?

(A) Ethanol

(B) Hydrogen

(C) Methane

(D) Natural Gas

Correct Answer

Answer: Option D
In the structure of Anti-Matter, the Electron is equivalent to

(A) Photon

(B) Positron

(C) Muon

(D) Quark

Correct Answer

Answer: Option B
The chemical symbol of Sodium is

(A) S

(B) So

(C) Na

(D) K

Correct Answer

Answer: Option C
N2 content is kept constant in the biosphere due to

(A) N2 fixation

(B) Industrial pollution

(C) Nitrogen cycle

(D) Absorption of N2

Correct Answer

Answer: Option C
Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?

(A) By cyanobacteria

(B) By electrical discharges in the atmosphere

(C) By industrially synthesized fertilizer

(D) By denitrification

Correct Answer

Answer: Option D
Which of the following gases is used for ripening the fruits?

(A) Methane

(B) Ethane

(C) Ethylene

(D) Acetylene

Correct Answer

Answer: Option C
Besides hydrogen, which of the following elements is common in organic compounds?

(A) Phosphorus

(B) Sulphur

(C) Nitrogen

(D) Carbon

Correct Answer

Answer: Option D
The hottest part of the gas flame is known as

(A) Luminous zone

(B) Dark zone

(C) Blue zone

(D) Non-luminous zone

Correct Answer

Answer: Option D
The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?

(A) 1/6

(B) 1/3

(C) 1/8

(D) 1/4

Correct Answer

Answer: Option C
The maximum number of covalent formed by nitrogen is

(A) 1

(B) 2

(C) 3

(D) 4

Correct Answer

Answer: Option D
The metal that is usually extracted from sea water is

(A) Ca

(B) Na

(C) K

(D) Mg

Correct Answer

Answer: Option D
Potassium nitrate is used in

(A) Medicine

(B) Fertiliser

(C) Salt

(D) Glass

Correct Answer

Answer: Option B
What is laughing gas?

(A) Nitrous Oxide

(B) Carbon monoxide

(C) Sulphur dioxide

(D) Hydrogen peroxide

Correct Answer

Answer: Option A
Soda water contains

(A) Carbonic acid

(B) Sulphuric acid

(C) Carbon dioxide

(D) Nitrous acid

Correct Answer

Answer: Option C
Marsh gas is

(A) Nitrogen

(B) Ethane

(C) Methane

(D) Hydrogen

Correct Answer

Answer: Option C
LPG consists of mainly

(A) Methane, ethane and hexane

(B) Ethane, hexane and nonane

(C) Methane, hexane and nonane

(D) Methane, butane and propane

Correct Answer

Answer: Option D
Most soluble in water is

(A) Camphor

(B) Sulphur

(C) Common salt

(D) Sugar

Correct Answer

Answer: Option D
Permanent hardness of water may be removed by the addition of

(A) Sodium carbonate

(B) Alum

(C) Potassium permanganate

(D) Lime

Correct Answer

Answer: Option A
Air is a/an

(A) Compound

(B) Element

(C) Electrolyte

(D) Mixture

Correct Answer

Answer: Option D
Which of the following is not an isotope of hydrogen?

(A) Tritium

(B) Deuterium

(C) Protium

(D) Yttrium

Correct Answer

Answer: Option D
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

Correct Answer

Answer: Option D
The property of a substance to absorb moisture from the air on exposure is called

(A) Osmosis

(B) Deliquescence

(C) Efflorescence

(D) Desiccation

Correct Answer

Answer: Option B
The chemical (ethyl mercaptan) added to the otherwise odorless LPG cooking gas for imparting a detectable smell to the gas is a compound of

(A) Bromine

(B) Fluorine

(C) Chlorine

(D) Sulfur

Correct Answer

Answer: Option D
Permanent hardness of water can be removed by adding

(A) Chlorine

(B) Washing soda

(C) Potassium permanganate

(D) Bleaching powder

Correct Answer

Answer: Option B
Washing soda is the common name for

(A) Sodium carbonate

(B) Calcium bicarbonate

(C) Sodium bicarbonate

(D) Calcium carbonate

Correct Answer

Answer: Option A
Tetraethyl lead is used as

(A) Pain killer

(B) Fire extinguisher

(C) Mosquito repellent

(D) Petrol additive

Correct Answer

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

Correct Answer

Answer: Option C
Heavy water is

(A) Deuterium oxide

(B) PH7

(C) Rain water

(D) Tritium oxide

Correct Answer

Answer: Option A
Balloons are filled with

(A) Nitrogen

(B) Helium

(C) Oxygen

(D) Argon

Correct Answer

Answer: Option B
Bromine is a

(A) Black solid

(B) Red liquid

(C) Colourless gas

(D) Highly inflammable gas

Correct Answer

Answer: Option B
Which of the gas is not known as green house gas?

(A) Methane

(B) Nitrous oxide

(C) Carbon dioxide

(D) Hydrogen

Correct Answer

Answer: Option D
Water is a good solvent of ionic salts because

(A) It has a high specific heat

(B) It has no colour

(C) It has a high dipole moment

(D) It has a high boiling point

Correct Answer

Answer: Option C
Detergents used for cleaning clothes and utensils contain?

(A) Bicarbonates

(B) Bismuthates

(C) Sulphonates

(D) Nitrates

Correct Answer

Answer: Option C

General Science 280+ MCQ PDF for SSC CHSL 2019

Imaginary lines are drawn on a global map from pole to pole and from the perpendicular to the Equator is called

(A) Contours

(B) Isobars

(C) Meridians

(D) Steppes

Gravity setting chambers are used in industries to remove

(A) SOX

(B) NOX

(C) Suspended particulate matter

(D) CO

A pond may be referred to as

(A) An artificial eco-system

(B) A natural eco-system

(C) A biome

(D) A community of plants and animals

Fathometer is used to measure

(A) Earthquakes

(B) Rainfall

(C) Ocean depth

(D) Sound intensity

At the equator, the duration of a day is

(A) 10 hrs

(B) 12 hrs

(C) 14 hrs

(D) 16 hrs

The term “Refraction of light” means

(A) Bending of light rays when they enter from one medium to another medium

(B) Bending of light round the corners of obstacles and apertures

(C) Coming back of light from a bright smooth surface

(D) None of these

Fish plates in Railway tracks are used to

(A) Connect two rails

(B) Join two coaches

(C) Guide the wheels

(D) Avoid fishes on the track

On a night when the sky is clear, the temperature may dip considerably; on a cloudy night the temperature will usually dip much less. The reason for this difference is that

(A) The clear sky allows radiant energy to escape readily from the earth

(B) On a cloudy night the clouds are warm and therefore retard the cooling

(C) The clear sky allows the cold of outer space to reach the earth

(D) Current of air carries the heat away from the earth on a clear night

Of the four locations mentioned below the highest inside temperature will be attained in the Pressure cooker operated with the pressure valve open

(A) At sea level

(B) At the top of Mt. Everest

(C) At a place in a valley below sea level

(D) In an airplane flying at a height of 10,000 m with inside pressure maintained at the sea level

Optical fiber works on the principle of

(A) refraction

(B) Total internal reflection

(C) Scattering

(D) Interference

Minimum numbers of unequal vectors which can give zero resultant are

(A) Two

(B) Three

(C) Four

(D) More than four

One should not connect a number of electrical appliances to the same power socket because

(A) This can damage the appliances due to overloading

(B) This can damage the domestic wiring due to overloading

(C) This can damage the electrical meter

(D) The appliance will not get full voltage

It is easier to roll a stone up a sloping road than to lift it vertical upwards because

(A) Work done in rolling is more than in lifting

(B) Work done in lifting the stone is equal to rolling it

(C) Work done in both is the same but the rate of doing work is less in rolling

(D) Work done in rolling a stone is less than in lifting it

Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following the phenomenon of radiation?

(A) Scattering

(B) Diffraction

(C) Interference

(D) Polarization

Mirage is due to

(A) Unequal heating of different parts of the atmosphere

(B) Magnetic disturbances in the atmosphere

(C) Depletion of ozone layer in the atmosphere

(D) Equal heating of different parts of the atmosphere

Sound waves in air are

(A) Transverse

(B) Longitudinal

(C) Electromagnetic