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General Science 280+ MCQ PDF for SSC CHSL 2019
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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 AnswerAnswer: Option C -
Gravity setting chambers are used in industries to remove
(A) SOX
(B) NOX
(C) Suspended particulate matter
(D) CO
Correct AnswerAnswer: 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 AnswerAnswer: Option B -
Fathometer is used to measure
(A) Earthquakes
(B) Rainfall
(C) Ocean depth
(D) Sound intensity
Correct AnswerAnswer: Option C -
At the equator, the duration of a day is
(A) 10 hrs
(B) 12 hrs
(C) 14 hrs
(D) 16 hrs
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option C -
Optical fiber works on the principle of
(A) refraction
(B) Total internal reflection
(C) Scattering
(D) Interference
Correct AnswerAnswer: Option B -
Minimum numbers of unequal vectors which can give zero resultant are
(A) Two
(B) Three
(C) Four
(D) More than four
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option A -
Sound waves in air are
(A) Transverse
(B) Longitudinal
(C) Electromagnetic
(D) Polarized
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option C -
ML2T-2 is the dimensional formula for
(A) Moment of inertia
(B) Pressure
(C) Elasticity
(D) Couple acting on a body
Correct AnswerAnswer: Option DGeneral Science 280+ MCQ PDF for SSC CHSL 2019
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Large astronomical telescopes always use as objective
(A) Lens
(B) Mirror
(C) Combinations of lenses
(D) None of the above
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option B -
Light from the Sun reaches us in nearly
(A) 2 minutes
(B) 4 minutes
(C) 8 minutes
(D) 16 minutes
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option D -
The universal law of gravitation was propounded by
(A) Kepler
(B) Galileo
(C) Newton
(D) Copernicus
Correct AnswerAnswer: Option C -
Summer solstice occurs in the Southern hemisphere on
(A) December 22
(B) January 22
(C) February 22
(D) February 28
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option D -
The main reserves of phosphorus in the biosphere is in the
(A) Hydrosphere
(B) Atmosphere
(C) Lithosphere
(D) Troposphere
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option BGeneral Science 280+ MCQ PDF for SSC CHSL 2019
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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 AnswerAnswer: Option C -
The largest planet of the solar system is
(A) Earth
(B) Mars
(C) Jupiter
(D) Saturn
Correct AnswerAnswer: Option C -
Which is the closest planet to Sun?
(A) Mars
(B) Venus
(C) Jupiter
(D) Mercury
Correct AnswerAnswer: Option D -
What is the instrument that determines specific gravity of liquids?
(A) Hygrometer
(B) Hydrometer
(C) Gravimeter
(D) Hypsometer
Correct AnswerAnswer: Option C -
Primitive man first learned
(A) To make fire
(B) To tame animals
(C) To make a wheel
(D) To grow grain
Correct AnswerAnswer: Option A -
In the visible spectrum, the color having the shortest wavelength is
(A) Green
(B) Yellow
(C) Violet
(D) Blue
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option C -
Photo-oxidation is
(A) Photorespiration
(B) Photolysis
(C) Light and oxygen induced breakdown
(D) All of the above
Correct AnswerAnswer: Option D -
Which of the following gases is not a noble gas?
(A) Zenon
(B) Argon
(C) Helium
(D) Chlorine
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option C -
The refrigerant commonly used for domestic refrigerators is
(A) Alcohol
(B) Ammonia
(C) Neon
(D) None of the above
Correct AnswerAnswer: 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 AnswerAnswer: Option D -
O2 released in the process of photosynthesis comes from
(A) CO2
(B) Water
(C) Sugar
(D) Pyruvic acid
Correct AnswerAnswer: Option B -
Which of the following diffuses most quickly?
(A) Solid
(B) Gas
(C) Liquid
(D) None of these
Correct AnswerAnswer: 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 rocksCorrect AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option A -
The mineral containing both magnesium and calcium is
(A) Magnesite
(B) Calcite
(C) Carnallite
(D) Dolomite
Correct AnswerAnswer: 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 AnswerAnswer: Option A -
Which of the following chemicals is useful in photography?
(A) Aluminium hydroxide
(B) Potassium nitrate
(C) Silver bromide(D) Sodium chloride
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option B -
The chief constituent of gobbar (cow dung) gas is
(A) Ethane
(B) Methane
(C) Hydrogen
(D) Carbon dioxide
Correct AnswerAnswer: Option B -
The reaction which converts sugar solution into alcohol is an example of
(A) Saponification
(B) Hydrogenation
(C) Fermentation
(D) Hydrolysis
Correct AnswerAnswer: 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 AnswerAnswer: Option B -
The agent which is oxidized in photosynthesis is
(A) Sunlight
(B) Carbon dioxide
(C) Water
(D) Chlorophyll
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option A -
The metal does not give H2 on treatment with dilute HCL is
(A) Zn
(B) Fe(C) Ag
(D) Ca
Correct AnswerAnswer: Option CGeneral Science 280+ MCQ PDF for SSC CHSL 2019
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The maximum number of isomers for an alkene with molecular formula C4H8 is
(A) 5
(B) 4
(C) 2
(D) 3
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option B -
The formula C6H5-CO-CH3 represents
(A) Acetone
(B) Acetic acid
(C) Acetophenone
(D) Phenyl acetate
Correct AnswerAnswer: 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 elementsCorrect AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option A -
Nowadays many novel chemicals are being synthesized termed as xenobiotics. The unique feature of these is what they are
I. BiodegradableII. 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 AnswerAnswer: Option B -
Soil acidity is generally corrected by
(A) Proper irrigation
(B) Adding sodium hydroxide
(C) Liming
(D) Application of fertilizers
Correct AnswerAnswer: 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 petrolCorrect AnswerAnswer: Option C -
Sulphur is not present in
(A) Iron pyrites
(B) Gypsum
(C) Coal
(D) Chlorapatite
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option B -
The oil used in the froth floatation process is
(A) Coconut oil
(B) Olive oil
(C) Kerosene oil
(D) Pine oil
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option A -
The metal used to recover copper from a solution of copper sulphate is
(A) Na
(B) Ag
(C) Hg
(D) Fe
Correct AnswerAnswer: Option D -
The main buffer system of the human blood is
(A) H2CO3 – HCO3
(B) H2CO3 – CO32-
(C) CH3COOH – CH3COO-
(D) NH2CONH2 – NH2CONH+Correct AnswerAnswer: 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 AnswerAnswer: Option B -
The nuclear particles which are assumed to hold the nucleons together are
(A) Electrons
(B) Positrons
(C) Neutrons
(D) Mesons
Correct AnswerAnswer: Option D -
The number of waves in n × 10th Bohr’s orbit are
(A) n2
(B) n
(C) n-2
(D) n3
Correct AnswerAnswer: Option B -
The gas used for artificial ripening of green fruit is
(A) Ethylene
(B) Ethane
(C) Carbon dioxide
(D) Acetylene
Correct AnswerAnswer: 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 AnswerAnswer: Option C -
The number of electrons presents in H+ is
(A) Zero
(B) One
(C) Two
(D) Three
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option A -
The most commonly used bleaching agent is
(A) Alcohol
(B) Carbon dioxide
(C) Chlorine
(D) Sodium chlorine
Correct AnswerAnswer: Option C -
The ore which is found in abundance in India is
(A) Monazite
(B) Fluorspar
(C) Bauxite
(D) Magnetite
Correct AnswerAnswer: 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 AnswerAnswer: Option B -
The hydronium ion is
(A) H+
(B) HO-
(C) H +
(D) H3O+
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option C -
The molecular formula of phosphorous is
(A) P1
(B) P2
(C) P3
(D) P4
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option BGeneral Science 280+ MCQ PDF for SSC CHSL 2019
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The iron ore magnetite consists of
(A) Fe2O3
(B) Fe3OH4
(C) FeCO3
(D) 3Fe2O3 & 3H2O
Correct AnswerAnswer: Option A -
The most important ore of aluminum is
(A) Bauxite
(B) Magnetite
(C) Hematite
(D) Monazite
Correct AnswerAnswer: Option A -
The National Chemical Laboratory (INDIA) is situated in
(A) New Delhi
(B) Bangalore(C) Pune
(D) Patna
Correct AnswerAnswer: Option C -
The main active constituent of tea and coffee is
(A) Nicotine
(B) Chlorophyll
(C) Caffeine
(D) Aspirin
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option D -
The inherited traits of an organism are controlled by
(A) RNA molecules
(B) Nucleotides
(C) DNA molecules
(D) Enzymes
Correct AnswerAnswer: 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 AnswerAnswer: Option D -
Zone refining is used for the purification of
(A) Au
(B) Ge
(C) Ag(D) Cu
Correct AnswerAnswer: Option B -
The hardest form of carbon is
(A) Coke
(B) Graphite
(C) Diamond
(D) Charcoal
Correct AnswerAnswer: Option C -
The inert gases are _________ in water
(A) Sparingly soluble
(B) Insoluble
(C) Soluble
(D) None of these
Correct AnswerAnswer: Option A -
The most electronegative element among the following is
(A) Sodium
(B) Bromine
(C) Fluorine
(D) Oxygen
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option C -
The most abundant rare gas in the atmosphere is
(A) He
(B) Ne
(C) Ar
(D) Xe
Correct AnswerAnswer: Option C -
The first metal used by man was
(A) Iron
(B) Copper
(C) Gold
(D) Bronze
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 gramCorrect AnswerAnswer: Option B -
The monomer of polythene is
(A) Vinyl chloride
(B) Ethylene
(C) Ethyl alcohol
(D) None of the above
Correct AnswerAnswer: Option B -
The most malleable metal is
(A) Platinum
(B) Silver
(C) Iron
(D) Gold
Correct AnswerAnswer: Option D -
The gas used in the manufacture of vegetable oil from vegetable is
(A) Hydrogen
(B) Oxygen
(C) Nitrogen
(D) Carbon dioxide
Correct AnswerAnswer: Option A -
The most electropositive elements among the following is
(A) Na
(B) Ca
(C) K
(D) Cs
Correct AnswerAnswer: 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 AnswerAnswer: Option A -
The major constituent of air is
(A) Nitrogen(B) Carbon dioxide
(C) Oxygen
(D) Hydrogen
Correct AnswerAnswer: Option A -
The main chemical constituent of clay is
(A) Silicon oxide
(B) Aluminium borosilicate
(C) Zeolites
(D) Aluminium silicate
Correct AnswerAnswer: Option D -
Most commonly used bleaching agent is
(A) Alcohol
(B) Carbon dioxide
(C) Chlorine
(D) Sodium chloride
Correct AnswerAnswer: Option C -
The electron was first identified by
(A) J. J. Thompson
(B) J. Kepler
(C) D. Rutherford
(D) James Chadwick
Correct AnswerAnswer: 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 AnswerAnswer: Option AGeneral Science 280+ MCQ PDF for SSC CHSL 2019
-
Which is the future fuel?
(A) Ethanol
(B) Hydrogen
(C) Methane
(D) Natural Gas
Correct AnswerAnswer: Option D -
In the structure of Anti-Matter, the Electron is equivalent to
(A) Photon
(B) Positron
(C) Muon
(D) Quark
Correct AnswerAnswer: Option B -
The chemical symbol of Sodium is
(A) S
(B) So
(C) Na
(D) K
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option D -
Which of the following gases is used for ripening the fruits?
(A) Methane
(B) Ethane
(C) Ethylene
(D) Acetylene
Correct AnswerAnswer: Option C -
Besides hydrogen, which of the following elements is common in organic compounds?
(A) Phosphorus
(B) Sulphur
(C) Nitrogen
(D) Carbon
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option C -
The maximum number of covalent formed by nitrogen is
(A) 1
(B) 2
(C) 3
(D) 4
Correct AnswerAnswer: Option D -
The metal that is usually extracted from sea water is
(A) Ca
(B) Na
(C) K
(D) Mg
Correct AnswerAnswer: Option D -
Potassium nitrate is used in
(A) Medicine
(B) Fertiliser
(C) Salt
(D) Glass
Correct AnswerAnswer: Option B -
What is laughing gas?
(A) Nitrous Oxide
(B) Carbon monoxide
(C) Sulphur dioxide
(D) Hydrogen peroxide
Correct AnswerAnswer: Option A -
Soda water contains
(A) Carbonic acid
(B) Sulphuric acid
(C) Carbon dioxide
(D) Nitrous acid
Correct AnswerAnswer: Option C -
Marsh gas is
(A) Nitrogen
(B) Ethane
(C) Methane
(D) Hydrogen
Correct AnswerAnswer: 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 AnswerAnswer: Option D -
Most soluble in water is
(A) Camphor
(B) Sulphur
(C) Common salt
(D) Sugar
Correct AnswerAnswer: Option D -
Permanent hardness of water may be removed by the addition of
(A) Sodium carbonate
(B) Alum
(C) Potassium permanganate
(D) Lime
Correct AnswerAnswer: Option A -
Air is a/an
(A) Compound
(B) Element
(C) Electrolyte
(D) Mixture
Correct AnswerAnswer: Option D -
Which of the following is not an isotope of hydrogen?
(A) Tritium
(B) Deuterium
(C) Protium
(D) Yttrium
Correct AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: 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 AnswerAnswer: Option D -
Permanent hardness of water can be removed by adding
(A) Chlorine
(B) Washing soda
(C) Potassium permanganate
(D) Bleaching powder
Correct AnswerAnswer: Option B -
Washing soda is the common name for
(A) Sodium carbonate
(B) Calcium bicarbonate
(C) Sodium bicarbonate
(D) Calcium carbonate
Correct AnswerAnswer: Option A -
Tetraethyl lead is used as
(A) Pain killer
(B) Fire extinguisher
(C) Mosquito repellent
(D) Petrol additive
Correct AnswerAnswer: 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 AnswerAnswer: Option C -
Heavy water is
(A) Deuterium oxide
(B) PH7
(C) Rain water
(D) Tritium oxide
Correct AnswerAnswer: Option A -
Balloons are filled with
(A) Nitrogen
(B) Helium
(C) Oxygen
(D) Argon
Correct AnswerAnswer: Option B -
Bromine is a
(A) Black solid
(B) Red liquid
(C) Colourless gas
(D) Highly inflammable gas
Correct AnswerAnswer: Option B -
Which of the gas is not known as green house gas?
(A) Methane
(B) Nitrous oxide
(C) Carbon dioxide
(D) Hydrogen
Correct AnswerAnswer: 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 AnswerAnswer: Option C -
Detergents used for cleaning clothes and utensils contain?
(A) Bicarbonates
(B) Bismuthates
(C) Sulphonates
(D) Nitrates
Correct AnswerAnswer: Option C
“And there’s nothing for man except what he strives for.” (Al- Quran, 53:39)