Good Science questions from physics, chemistry, zoology and botany for students
The velocity of rotation of Earth is
(a) 28 km/min
(b) 30 km/min
(c) 25 km/min
(d) 39.5 km/min
Respiration is a :
(a) Catabolic process
(b) Anabolic process
The dynamo is a device for converting
(a) Heat energy into electrical energy
(b) Mechanical energy into electrical energy
(c) Magnetic energy into electrical energy
Which of the following gases is important for respiration and combustion?
(a) Carbon dioxide
(b) Nitrogen
(c) Oxygen
(d) Hydrogen
During lightning certain oxides are discharged into air. The oxides are of
(a) Oxygen
(b) Nitrogen
(c) Carbon dioxide
(d) Hydrogen
Burning of a paper is a:
(a) Chemical change
(b) Slow change
(c) Physical change
(d) Periodic Change
Rift valley is formed by
(a) Earthquake
(b) Folding
(c) Faulting
Which of the following is used in photography?
(a) Silver Bromide
(b) Sodium Bromide
(c) Potassium Chloride
(d) Sodium Sulphate
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Septic sore throat is caused by :
(a) Bacteria & Virus
(b) Virus & Fungi
(c) Fungi
(d) Protozoans
The chemical name of Vitamin A is
(a) Retinol
(b) Jhiamin
(c) Biotic
(d) Riboflavin
Electricians use rubber gloves while working because
(a) rubber is an insulator
(b) rubber is a good conductor
(c) wearing rubber gloves is mandatory
(d) rubber makes work easy
When ‘a’ gram of magnesium was burnt in air, ‘b’ gram of MgO was formed. Then,
(a) a = b
(b) a > b
(c) b > a
(d) All the above
Painting keeps away ____ and ____ from steel structures and prevents rusting of it
(a) Oxides and chlorides
(b) Air and moisture
(c) Nitrogen and Oxygen
Ethyl acetate at room temperature is a
(a) Solid
(b) Liquid
(c) Gas
(d) Solution
Henry is a unit of
(a) Capacity
(b) Magnetic field
(c) Inductance
(d) Frequency
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The time period of a seconds pendulum is
(a) 1 second
(b) 4 seconds
(c) 3 seconds
(d) 2 seconds
The pH of a neutral solution at 25oC is :
(a) 0
(b) 1.0
(c) 7.0
(d) 1.4
On 22nd December, which of the following places has the largest day and shortest night?
(a) Melbourne
(b) Moscow
(c) Madrid
(d) Chennai
The permanent hardness of water is due to the presence of
(a) Calcium
(b) Sulfate
(c) Magnesium
(d) All of these
Lead pencil contains
(a) Graphite
(b) Diamond
(c) Lead
(d) Lead sulp
Fizzy drinks are __________.
(a) Basic
(b) Acidic
(c) Amphoteric
(d) Soft
Growing of seedling from seed is a:
(a) Physical change
(b) Chemical change
(c) Reversible change
(d) Periodic change
At which temperature Fahrenheit and Celsius show same reading?
(a) -400
(b) 00
(c) -574.250
(d) 2730
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A body is thrown vertically upward and it reaches 10m high. Find the velocity with which the body was thrown? (g = 9.8 m/s)
(a) 10 m/sec
(b) 18 m/sec
(c) 14 m/sec
(d) 7 m/sec
Which of the following uses non-conventional Source of Energy?
(a) Kerosene lamp
(b) Wax candle
(c) Solar lantern
(d) Torch
Sulphur is used in vulcanisation of _______
(a) Tyre
(b) Rubber
(c) Polymer
(d) None
What gas is used to make carbonated soft drinks and soda water?
(a) Helium
(b) Carbon dioxide
(c) Nitrous oxide
(d) Methane
The constant temperature at which a solid starts changing into a liquid
(a) Melting point
(b) Boiling point
(c) Freezing point
(d) Triple point
The force of attraction between the molecules of a gas is:
(a) Negligible
(b) Large
(c) Not known
(d) Small
When pollen of a flower is transferred to the stigma of the same plant, pollination type is referred to as :
(a) Autogamy
(b) Allogamy
(c) Xenogamy
(d) Geitonogamy
Which of the following is a complementary colour?
(a) Blue
(b) Yellow
(c) Magenta
(d) Yellow and Magenta
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The glass used for making laboratory apparatus is :
(a) Pyrex glass
(b) Hard glass
(c) Soft glass
(d) Safety glass
‘Widal test’ is used for susceptibility of :
(a) Malaria
(b) Typhoid
(c) Cholera
(d) Yellow fever
The change of day into night is a
(a) Periodic change
(b) Physical change
(c) Fast change
(d) Slow change
Which of the following is not an ore of aluminium :
(a) Cryolite
(b) Feldspar
(c) Bauxite
(d) Azurite
Oxides of sulphur contribute towards _________.
(a) Sulphur dioxides
(b) Sulphur trioxides
(c) Acid rains
(d) Micro chips
In ionic solid, the velocity of electricity is
(a) fast
(b) weak
(c) less than solid
(d) less than gas
By selling an article at some price a person gains 10%. If the article is sold at twice of the price, the gain percent will be
(a) 20%
(b) 60%
(c) 100%
(d) 120%
In diesel engine, ignition is caused by
(a) Spark
(b) Automatic starter
(c) Compression
(d) Friction
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The function of haemoglobin in the body is
(a) Transport of oxygen
(b) Destruction of bacteria
(c) Prevention of anemia
(d) Utilization of iron
The buoyancy depends on the
(a) Depth of the fluid
(b) Density of the fluid
(c) Volume of the fluid
(d) Weight of the fluid
Pneumonia affects
(a) Lungs
(b) Tongue
(c) Liver
(d) Kidney
Air is a/an —
(a) Compound
(b) Element
(c) Mixture
(d) Electrolyte
A 130m long train crosses a bridge in 30 seconds at 45 kmph. The length of the bridge is
(a) 200m
(b) 225m
(c) 245m
(d) 250m
When a ray of light passes from an optically denser medium to a rarer medium, it
(a) Remains undeviated
(b) Bends towards normal
(c) Bends away from normal
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Galvanised Iron sheets have a coating of
(a) Tin
(b) Lead
(c) Zinc
(d) Chromium
The part of the plant which is responsible for carrying water and solutes from roots to various parts of plants is:
(a) Phloem
(b) Xylem
(c) Duodenum
(d) Sclercids
If a piece of ice at 0oc is mixed with water at 0oc, then
(a) Whole ice melts
(b) Some ice melts
(c) No ice melts
(d) Temperature decreases
Exchange of gases in plants takes place through :
(a) Stomata
(b) Lenticels
(c) Cuticle
(d) All of these
High pressure subtropical calm belts known as ‘Horse Latitudes’ lies between ____
(a) 00 and 150
(b) 200 and 250
(c) 300 and 350
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Which of the following is used in accumulator cell?
(a) Copper
(b) Iron
(c) Lead
(d) Zinc
The gas predominantly responsible for global warning is
(a) Carbon dioxide
(b) Carbon monoxide
(c) Nitrous oxide
(d) Nitrogen peroxide
The raw material used for the manufacture of Portland cement is :
(a) Limestone and clay
(b) Alumina, clay and gypsum
(c) Gypsum and limestone
(d) Gypsum and clay
Which of the following is the reasons for the sky generally appearing blue?
(a) Deviation effect
(b) Conduction
(c) Reflection
(d) Dispersion
Choose the wrong statement :
(a) Single magnetic poles can exist
(b) Magnetic poles are always of equal strength
(c) Like poles repel each other
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Powdery mildew of wheat is caused by:
(a) Bacteria
(b) Virus
(c) Fungi
(d) Protozoans
The speed of light with the rise in the temperature of the medium
(a) Increases
(b) Decreases
(c) Remains unaltered
(d) Drops sharply
Which of the following is not an electric resistant?
(a) Lead
(b) Ebonite
(c) Charcoal
(d) Lac
Ionic bond exists in
(a) KCl
(b) NaCl
(c) NCl
(d) CaCl
The mass-energy equivalence, relationship E = mc2 was propounded by
(a) Max Plank
(b) Einstein
(c) Newton
(d) Hertz
The magnetic effect of electric current was first observed by
(a) Henry
(b) Oersted
(c) Faraday
(d) Volta
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CaOCI2 is the chemical formula for a compound commonly known as :
(a) Soda Ash
(b) Lime
(c) Bleaching Powder
(d) Plaster of Paris
The temperature of water at the bottom of a large waterfall is higher than that of the water at the top, because
(a) the falling water absorbs heat from the Sun
(b) the Water at the bottom has greater potential energy
(c) the kinetic energy of the falling water is converted into heat
(d) the rocks on the bed of the river give out heat
Nitrogen fixing bacteria are normally found in :
(a) Parasitic plants
(b) Epiphytic plants
(c) Leguminous plants
(d) Aquatic plants
Electric current is measured by
(a) Voltmeter
(b) Anemometer
(c) Commutator
(d) Ammeter
Limestone is metamorphosed to form
(a) Graphite
(b) Quartz
(c) Granite
(d) Marble
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On heating, solid is directly converted into a gaseous state. This process is called
(a) Sublimation
(b) Evaporation
(c) Diffusion
(d) Condensation
Rhombic monoclinic and plastic sulphur are:
(a) Isomers
(b) Isotopes
(c) Allotropes
(d) Hydrides of sulphur
When salt is properly mixed with ice, the melting point of ice _
(a) decreases
(b) increases
(c) remains the same
(d) becomes infinite
Which of the following statement is false?
(a) The shape of a solid is fixed
(b) The volume of a liquid is fixed
(c) The shape and volume of a gas are fixed
(d) A liquid aquires the shape of its container
The filament of bulb is made of
(a) Tungsten
(b) Iron
(c) Nichrome
(d) Carbon
Nitrates, Phosphates, metals are examples of which type of impurities in sewage
(a) Organic
(b) Inorganic
(c) Nutrients
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The velocity of sound increases in air by ___ for every degree Celsius increase of temperature.
(a) 60 m/sec
(b) 0.61 m/sec
(c) 60 ft/sec
(d) 0.61 km/sec
Which of the following enzymes is generally nor present in adult human :
(a) Renin
(b) Pepsin
(c) Trypsin
(d) Amylopsin
Which is the one that does not belong to this group?
(a) Copper
(b) Zinc
(c) Brass
(d) Aluminium
The percentage of glucose present in the normal urine is
(a) 0.1%
(b) 2%
(c) 9.5%
(d) 0%
Scurf is another name for what?
(a) Scrape mark or abrasion
(b) Scurvy
(c) Dandruff
(d) Sea spray
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In nucleuic protein, Uceriotic chromosomes are alike in
(a) prophase
(b) Metaphase
(c) Anaphase
The iron produced in blast furnace is :
(a) Pig iron
(b) Wrought iron
(c) Stainless steel
(d) Steel
The second’s hand of a watch is 2 cm long. The velocity of its tip is
(a) 0.21 cm/sec
(b) 2.1 cm/sec
(c) 21 cm/sec
(d) None of these
‘=’ symbol on weather map indicates
(a) Rain
(b) Mist
(c) Thunderstorm
(d) Fog
In increasing sequence, the major elements present in the human body are
(a) Calcium, iron, sodium, phosphorus
(b) Calcium, phosphorus, potassium, sulphur
(c) Calcium, iron, sodium, sulphur
(d) Calcium, potassium, phosphorus, iron
The hardest substance available on earth is
(a) Platinum
(b) Diamond
(c) Quartz
(d) Gold
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Flemings left hand rule is used to fine out:
(a) Direction of magnetic field due to flow of current
(b) Direction of induced current due to effect of magnetic field
(c) Direction of motion of a current carrying conductor in magnetic field
Anti-knocking can be lessened by
(a) Iso Octane
(b) N Heptane
(c) TEL
(d) Benzene
Among the various allotropes 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
The force between two parallel wires conducting current is used to define
(a) Ampere
(b) Coulomb
(c) Volt
(d) Newton
Which force is required to increase the momentum of an object to 40 kg m/s in 5 seconds?
(a) 2N
(b) 4N
(c) 8N
(d) 10N
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Diffusion occurs in
(a) Solids
(b) Liquids
(c) Gases
(d) Liquids and gases
The chemical name of the bleaching powder is:
(a) Calcium oxide
(b) Sodium hydrogen carbonate
(c) Sodium bicarbonate
(d) Calcium oxychloride
The substances controlling the allergic reaction are called
(a) Histamine substances
(b) Anti inflammatory substances
(c) Inflamatory substances
(d) Anti histamine substances
Which Charcoal adsorbs coloring matter and odoriferous gases ?
(a) Activated Charcoal
(b) Animal Charcoal
(c) Wood Charcoal
