290+ Biology-Physics-Chemistry (GK) Solved MCQs


Random Movement of particles was discovered by

A. Robert Brown
B. E. Goldstein
C. James Chadwick
D. Wilhein Weins
Answer» A. Robert Brown

Scattering of light by colloidal particles is known as

A. Tyndall effect
B. Brownian motion
C. reflection
D. rectilinear propagation
Answer» A. Tyndall effect

Which of the following non-metals occur in liquid form at room temperature?

A. bromine
B. carbon
C. sulphur
D. chlorine
Answer» A. bromine

Brass is an example of a ______

A. homogenous compound
B. homogenous mixture
C. heterogeneous mixture
D. heterogeneous compound
Answer» B. homogenous mixture

Which of the following is not a noble gas?

A. helium
B. neon
C. argon
D. hydrogen
Answer» D. hydrogen

Which of the following acids is present in sour milk?

A. glycolic acid
B. lactic acid
C. citrus acid
D. tartaric acid
Answer» B. lactic acid

Which of the following acids is called the king of the acids?

A. acetic acid
B. phosphoric acid
C. oxalic acid
D. sulphuric acid
Answer» D. sulphuric acid

The sharp pain caused by the sting of an ant is due to

A. malic acid
B. nitric acid
C. formic acid
D. lactic acid
Answer» C. formic acid

Vitamin C is an organic acid known as

A. ascorbic acid
B. citrus acid
C. glycolic acid
D. acetic acid
Answer» A. ascorbic acid

Soaps are sodium salts of

A. mineral acids
B. fatty acids
C. bases
D. carbonic acid
Answer» B. fatty acids

Sodium bicarbonate is also known as

A. washing soda
B. baking soda
C. glauber’s salt
D. lime soda
Answer» B. baking soda

Which of the following is not a property of acids?

A. all acids have a sour taste
B. acids turn blue litmus red
C. acids turn red litmus blue
D. all acids form H+
Answer» C. acids turn red litmus blue

Which of the following acid is used in fire extinguishers?

A. hydrochloric acid
B. sulphuric acid
C. nitric acid
D. oxalic acid
Answer» B. sulphuric acid

Which of the following acid is used by goldsmiths for cleaning gold and silver ornaments?

B. H2SO4
D. H3PO4
Answer» C. HNO3

Which order of relative size amongst the following is incorrect?

A. Li < Na < K
B. C < Si < Al
C. Mg > Al < Na
D. F < Cl < Br
Answer» C. Mg > Al < Na

Which one of the following has the smallest size?

A. Al
B. Al+
C. Al+2
D. Al+3
Answer» D. Al+3

Which of the following is an example of fossil fuel?

A. coal gas
B. coke
C. natural gas
D. producer gas
Answer» C. natural gas

When steam is passed over hot coke, it produces

A. producer gas
B. synthesis gas
C. tear gas
D. coal gas
Answer» B. synthesis gas

Producer gas is a mixture of

A. carbon monoxide and nitrogen gas
B. carbon monoxide and hydrogen gas
C. carbon monoxide and water vapour
D. carbon monoxide and nitrous oxide
Answer» A. carbon monoxide and nitrogen gas

Water gas consists of

A. water vapour and coal dust
B. a mixture of carbon monoxide and hydrogen
C. a mixture of carbon monoxide and the nitrogen
D. water vapour and methane.
Answer» B. a mixture of carbon monoxide and hydrogen

The gas used in the welding and cutting of metals is

A. ethane
B. ethene
C. ethyne
D. propene
Answer» C. ethyne

Coal with largest C content is

A. anthracite
B. peat
C. lignite
D. bituminous
Answer» A. anthracite

An allotropic form of carbon used for cutting and drilling is

A. charcoal
B. bone charcoal
C. graphite
D. diamond
Answer» D. diamond

Cinnabar is an ore of

A. Pb
B. Zn
C. Hg
D. Cu
Answer» C. Hg

Which of them is not an ore of silver?

A. Ag2S
B. AgNO3
C. AgCl
D. None of these
Answer» D. None of these

Which of the following alloys contains Tin?

A. brass
B. solder
C. duralumin
D. steel
Answer» B. solder

An amalgam of metal has which other element?

A. C
B. Ag
C. Mg
D. Hg
Answer» D. Hg

Gold is alloyed with which metal to make it harder?

A. Cu
B. Hg
C. Ag
D. C
Answer» A. Cu

The most abundant element in the universe is

A. helium
B. oxygen
C. silicon
D. hydrogen
Answer» B. oxygen

The most abundant metal on the earth is

A. iron
B. gold
C. aluminium
D. copper
Answer» C. aluminium

Aluminium is extracted from

A. hematite
B. bauxite
C. calamine
D. magnetite
Answer» B. bauxite

Metallurgy is the process of

A. extracting metals from the Ore
B. roasting the Ore
C. liquefaction of nitrogen
D. adding carbon to the Ore in blast furnace
Answer» A. extracting metals from the Ore

A metal, which melts on the palm

A. potassium
B. sodium
C. gallium
D. zinc
Answer» B. sodium

The process of protecting iron by coating with Zinc.

A. smelting
B. galvanising
C. rusting
D. corrosion
Answer» B. galvanising

A lustrous non-metal is

A. diamond
B. iodine
C. sulphur
D. phosphorus
Answer» B. iodine

Sodium is a

A. silvery white and very soft metal
B. colourless and hard metal
C. silvery white and very hard metal
D. colourless and very soft metal
Answer» A. silvery white and very soft metal

Which of the following is used for making magnets?

A. duralumin
B. magnalium
C. bronze
D. alnico
Answer» D. alnico

What should be added to pure iron to make stainless steel?

A. nickel and cobalt
B. cadmium and chromium
C. nickel and cadmium
D. chromium and nickel
Answer» D. chromium and nickel

The red or Orange coating that forms on the surface of iron when exposed to air and moisture for some time is called

A. galvanization
B. electroplating
C. rust
D. reduction
Answer» C. rust

The tip of the lead pencil is made of

A. lead
B. graphite
C. zinc
D. charcoal
Answer» B. graphite

The most abundant element in the sun’s atmosphere is

A. xenon
B. argon
C. hydrogen
D. oxygen
Answer» C. hydrogen

Ordinary glass is a mixture of

A. sodium silicate, Calcium silicate
B. sodium silicate, Calcium silicate and Silica
C. sodium silicate and Silica
D. none of the above
Answer» A. sodium silicate, Calcium silicate

Glass used for making wind screens of automobiles is

A. hard glass
B. photo chromatic glass
C. safety glass
D. optical glass
Answer» C. safety glass

Annealing is done to

A. increase brittleness
B. increase Transparency
C. decrease brittleness
D. increase refractive index
Answer» C. decrease brittleness

Steel is preferred over iron in construction of ships because

A. melting point of steel is higher than Iron
B. steel is more uniform than Iron
C. steel does not rust
D. tensile strength of steel is not high
Answer» C. steel does not rust

The carbon content in steel is

A. 0.1 – 5.0%
B. 2.0 – 2.5%
C. 0.1 – 1.5%
D. less than 0.1
Answer» C. 0.1 – 1.5%

Permanent magnets can be made from

A. Ni steel
B. cobalt steel
C. stainless steel
D. wrought iron
Answer» D. wrought iron

The main constituents of cement are:

A. calcium oxide, silicon dioxide, Aluminium oxide
B. calcium oxide, Iron oxide, Sulphur dioxide
C. magnesium oxide, Silicon dioxide, Aluminium oxide
D. none of these
Answer» A. calcium oxide, silicon dioxide, Aluminium oxide

A thick paste of cement, sand and water is called

A. concrete
B. mortar
C. slurry
D. moderator
Answer» B. mortar

The process of making soap by the hydrolysis of fats and oils with alkalis is called

A. hydrolysis
B. saponification
C. esterification
D. none of these
Answer» B. saponification

The soap can be hardened by

A. adding sodium carbonate or sodium silicate during its manufacture
B. adding sodium chloride
C. adding potassium hydroxide
D. adding animal fat and coconut oil
Answer» A. adding sodium carbonate or sodium silicate during its manufacture

Bleaching powder is

A. CaO2Cl
B. CaOCl2
C. CaClO2
D. CaCl2+O2
Answer» B. CaOCl2

Plaster of Paris is obtained by heating

A. gypsum
B. limestone
C. sodium carbonate
D. calcium sulphate
Answer» A. gypsum

The common name of sodium bicarbonate is

A. lime
B. baking powder
C. baking soda
D. washing soda
Answer» B. baking powder

Slaked lime reacts with chlorine to give

A. baking soda
B. washing soda
C. bleaching powder
D. cement
Answer» C. bleaching powder

The main constituent of cement is

A. SiO2
B. CaO
C. CaSO4
D. Al2O3
Answer» A. SiO2

The real bleaching agent present in bleaching powder is

A. chlorine
B. oxygen
C. oxygen
D. CaO
Answer» A. chlorine

Cake does not taste bitter due to presence of

A. sodium carbonate
B. tartaric acid
C. citric acid
D. sugar
Answer» B. tartaric acid

What is obtained on adding lime to H2O?

A. lime
B. limestone
C. slaked lime
D. quicklime
Answer» C. slaked lime

Which of the following is different from others?

A. speed
B. density
C. force
D. time
Answer» D. time

The amount of substance in the SI system of units is represented by

A. candela
B. mole
C. weight
D. kilogram
Answer» B. mole

The SI unit of temperature is

A. Kelvin
B. second
C. mole
D. candela
Answer» A. Kelvin

The National Physical Laboratory is situated at

A. Kolkata
B. New Delhi
C. Bombay
D. None of these
Answer» B. New Delhi

The SI unit of electric current is

A. ampere
B. candela
C. mole
D. none of these
Answer» A. ampere

How many fundamental units are present in the SI system of units?

A. 5
B. 6
C. 7
D. 3
Answer» C. 7

Which of the following physical quantities is different from others?

A. speed
B. distance
C. energy
D. average velocity
Answer» D. average velocity

The unit for the rate of change of velocity will be

A. m/s
B. m/s2
C. Ns
D. N/s
Answer» B. m/s2

The velocity of a body at rest is always

A. unity
B. negative
C. zero
D. infinite
Answer» C. zero

Impulse is

A. a scalar quantity
B. a vector quantity
C. neither a scalar nor a vector
D. sometimes a scalar and sometimes a vector
Answer» B. a vector quantity

The weight of a body would not be zero

A. at the centre of the earth
B. during a free fall
C. in interplanetary space
D. on a frictionless surface
Answer» D. on a frictionless surface

A man is standing on a boat in still water. If he walks towards the shore the boat will

A. move away from the shore
B. remain stationary
C. move towards the shore
D. sink
Answer» A. move away from the shore

If action and reaction were to act on the same body,

A. the resultant would be zero
B. the body would not move at all
C. both (a) and (b) are correct
D. neither (a) nor (b) is correct
Answer» C. both (a) and (b) are correct

The combined effect of mass and velocity is taken into account by a physical quantity called

A. torque
B. moment of force
C. momentum
D. moment of momentum
Answer» C. momentum

Momentum is a measure of

A. weight
B. mass
C. quantity of motion
D. velocity
Answer» C. quantity of motion

A rocket works on the

A. first law of motion
B. second law of motion
C. third law of motion
D. law of conservation of energy
Answer» C. third law of motion

When a bicycle travels on a rough surface, its speed

A. increases
B. decreases
C. remains the same
D. none of these
Answer» B. decreases

It is difficult to walk on ice because of

A. absence of friction
B. absence of inertia
C. more inertia
D. more friction
Answer» A. absence of friction

The law which defines force is

A. Newton’s third law of motion
B. Newton’s first law of motion
C. Newton’s second law of motion
D. Newton’s law of gravitation
Answer» B. Newton’s first law of motion

Friction between any two objects is due to

A. attraction between them
B. repulsion between them
C. some adhesive forces between them
D. irregularities on the surfaces
Answer» D. irregularities on the surfaces

Pascal is the unit for

A. pressure
B. thrust
C. buoyant force
D. None of these
Answer» A. pressure

The mercury barometer was invented by

A. Celsius
B. Fahrenheit
C. Torricelli
D. Bernoulli
Answer» C. Torricelli

The buoyant force depends on

A. depth of a liquid
B. colour of a liquid
C. density of liquid
D. none of these
Answer» C. density of liquid

The hot air balloon rises because it is

A. denser
B. less dense
C. equally dense
D. the given statement is wrong
Answer» B. less dense

A boat full of iron nails is floating on water in a lake. When the iron nails are removed, the water level

A. rises
B. falls
C. remains the same
D. nothing can be said
Answer» B. falls

An ice cube is floating in a glass of water. What happens to the water level when the ice melts?

A. rises
B. falls
C. remains same
D. first rises and then falls
Answer» C. remains same

The branch of physics which deals with the study of fluids in motion is called

A. dynamics
B. hydrostatics
C. hydrodynamics
D. none of these
Answer» C. hydrodynamics

Pressure is a

A. scalar quantity
B. vector quantity
C. normal force
D. all the above are wrong
Answer» A. scalar quantity

The upward force acting on the body immersed in a fluid is called

A. hydrostatic pressure
B. buoyant force
C. true weight
D. net force
Answer» B. buoyant force

Work done upon a body is

A. a vector quantity
B. a scalar quantity
C. always positive
D. always negative
Answer» B. a scalar quantity

the flowing water of a river possesses ______ energy.

A. gravitational
B. potential
C. electrical
D. kinetic
Answer» D. kinetic

The unit of power is

A. watt per second
B. joule
C. kilo joule
D. watt
Answer» D. watt

A bird flying in the sky has

A. K.E. only
B. P.E. only
C. neither K.E. nor P.E.
D. both K.E. and P.E.
Answer» D. both K.E. and P.E.

In summer, the clocks

A. become slow
B. become fast
C. gives correct time
D. lose time
Answer» A. become slow

Therm is the unit of

A. heat
B. temperature
C. thermometry
D. work
Answer» A. heat

Heat flows as a result of difference of

A. temperatures
B. weights
C. masses
D. none of these
Answer» A. temperatures

The first thermometer was developed by

A. Joule
B. Fahrenheit
C. Galileo
D. Watt
Answer» C. Galileo

Soda bottles are made of thick glass so that they can withstand the

A. pressure in summer
B. temperature in summer
C. decrease in viscosity
D. increase in potential energy
Answer» A. pressure in summer

Evaporation is the process of changing liquid into vapour

A. at any temperature
B. above its boiling point
C. at its boiling point
D. below its boiling point
Answer» D. below its boiling point

The period of pendulum depends upon

A. mass
B. length
C. amplitude
D. energy
Answer» B. length

Potential energy of the bob is maximum

A. at the mean position
B. at the extreme position
C. between the mean position and extreme positions
D. none of these
Answer» B. at the extreme position
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