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WBCS 2019 — General Science Questions with Answers

All 65 General Science previous-year questions from WBCS 2019, each with the correct answer and a full explanation. Practise them as a free, timed mock test with instant scoring.

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Q1.Organizations
What does 'CSIR' stand for?
- a)Council of Scientific and Industrial Research
- b)Center for Science and Industrial Research
- c)Center for Share and Investment Ratio
- d)Council for Scientific and Informational Research
Q2.Physics
Black holes were predicted by
- a)Copernicus
- b)Einstein
- c)Rutherford
- d)Satyen Bose
Q3.Biology
What is the national aquatic animal of India?
- a)River Dolphin
- b)Green Sea Turtle
- c)Seahorse
- d)Dugong
Q4.Biology
The following is not a macronutrient:
- a)Mg
- b)Ca
- c)Fe
- d)K
Q5.Biology
Loss of water is maximum from
- a)leaf surface
- b)soil surface
- c)root
- d)stem surface
Q6.Biology
The following virus is water borne:
- a)Hepatitis A
- b)Hepatitis B
- c)Hepatitis C
- d)Hepatitis E
Q7.Biology
The following organism is an endosymbiont:
- a)Anabaena
- b)Azatobacter
- c)Clostridium
- d)Nitrobacter
Q8.Chemistry
Oxidation state of Oxygen in F2O is
- a)-1
- b)+1
- c)+2
- d)-2
Q9.Chemistry
Which of the following does not have coordinate bond?
- a)SO2
- b)HNO2
- c)HNO3
- d)H2SO3
Q10.Chemistry
The homologue of ethyne is
- a)C2H2
- b)C2H6
- c)C3H4
- d)C3H8
Q11.Chemistry
Which is used in alcoholic beverages?
- a)Ethanol
- b)Methanol
- c)Phenol
- d)Glycerol
Q12.Human Physiology
Which of the following is the largest gland in an adult man?
- a)Thymus
- b)Liver
- c)Thyroid
- d)Pancreas
Q13.Biology
Indusium is found in
- a)algae
- b)moss
- c)ferns
- d)cycas
Q14.Biology
In plants, water supply is due to
- a)osmosis
- b)imbibition
- c)guttation
- d)adhesion force
Q15.Biology
In which form does the food transported in plants?
- a)Sucrose
- b)Fructose
- c)Glucose
- d)Lactose
Q16.Physics
Which of the following electromagnetic waves have the smallest wavelength?
- a)Infrared rays
- b)UV rays
- c)X-rays
- d)γ-rays
Q17.Chemistry
Which of the following configurations corresponds to element of highest ionisation energy?
- a)1s2, 2s1
- b)1s2, 2s2, 2p3
- c)1s2, 2s2, 2p2
- d)1s2, 2s2, 2p6, 3s1
Q18.Chemistry
Which is correctly matched?
- a)Apiculture – Honey bee
- b)Pisciculture – Silk moth
- c)Sericulture – Fish
- d)Aquaculture – Mosquito
Q19.Human Physiology
In blood, CO2 is transported majorly as
- a)CO2 as such
- b)Sodium Carbonate
- c)Bicarbonate
- d)Carboxy haemoglobin
Q20.Human Physiology
Kupffer cells are present in
- a)Pancreas
- b)Liver
- c)Thyroid
- d)Small intestine
Q21.Human Physiology
The vitamin which is essential for blood clotting is
- a)vitamin – A
- b)vitamin – B
- c)vitamin – C
- d)vitamin – K
Q22.Human Physiology
Which of the following is not vestigial in man?
- a)Tail vertebrae
- b)Nails
- c)Nictitating membrane
- d)Vermiform appendix
Q23.Nuclear
The function of heavy water in a nuclear reactor is to
- a)cool down the reactor.
- b)stop the nuclear reaction.
- c)slow down the speed of neutrons.
- d)increase the speed of neutrons.
Q24.Chemistry
The general molecular formula for disaccharide is
- a)C10H20O10
- b)C12H22O11
- c)C12H20O10
- d)C12H22O10
Q25.Biology
Proteins are composed of
- a)vitamins
- b)carbohydrates
- c)α-amino acids
- d)mineral salts
Q26.Biology
Which of them contains all the information required to fold the polypeptide chain in its 3-D structure?
- a)DNA sequences
- b)RNA
- c)Histone protein
- d)Amino acid sequences
Q27.Biology
Name the RNA molecules which is used to carry genetic information copied from DNA?
- a)tRNA
- b)mRNA
- c)rRNA
- d)snRNA
Q28.Human Physiology
Name the disease caused by the deficiency of Niacin.
- a)Pellagra
- b)Rickets
- c)Scurvy
- d)Pernicious anemia
Q29.Human Physiology
Which of the following vitamin serves as a hormone precursor?
- a)Vitamin – C
- b)Vitamin – A
- c)Vitamin – K
- d)Vitamin – D
Q30.Biology
Which of the following is not a component of the nucleus?
- a)Chromosome
- b)Nucleolus
- c)Cytoplasm
- d)Nuclear envelope
Q31.Physics
The value of the compressibility of an ideal fluid is
- a)zero
- b)unity
- c)infinity
- d)more than that of a real fluid
Q32.Physics
In electromagnetic theory, continuity equation relates ________.
- a)volume conservation
- b)mass conservation
- c)charge conservation
- d)energy conservation
Q33.Physics
Which is the cheapest device for measuring flow/discharge rate?
- a)Venturimeter
- b)Pitot tube
- c)Orificemeter
- d)None of the above
Q34.Space
What is the shape of Earth's orbit?
- a)Ellipse with high eccentricity
- b)Ellipse with low eccentricity
- c)Circle
- d)None of the above
Q35.Chemistry
X-ray films are a source of which of the following gas?
- a)SO2
- b)CO2
- c)NO2
- d)SO3
Q36.Space
The solar sunspot cycle is
- a)3 years
- b)7 years
- c)11 years
- d)14 years
Q37.Space
Asteroid belt is situated between the orbit of
- a)Mercury and Venus
- b)Mars and Jupiter
- c)Jupiter and Saturn
- d)Uranus and Neptune
Q38.Space
Formation of stars begin from the following two gases:
- a)Hydrogen and Nitrogen
- b)Nitrogen and Oxygen
- c)Oxygen and Hydrogen
- d)Hydrogen and Helium
Q39.Physics
What is the main energy generation process in the Sun?
- a)Nuclear fission
- b)Nuclear radioactive decay
- c)Gravitational energy
- d)Nuclear fusion
Q40.Physics
What property of Earth protects us from harmful radiation from the Sun?
- a)Trees
- b)Atmosphere
- c)70% water
- d)Earth's motion around the Sun
Q41.Physics
The emission spectrum of hydrogen discovered first and the region of the electromagnetic spectrum in which it belongs, respectively are
- a)Lyman, ultraviolet
- b)Lyman, visible
- c)Balmer, ultraviolet
- d)Balmer, visible
Q42.Biology
Who described the structure of DNA double helix?
- a)Peter Mitchell
- b)Andre Jagendorf
- c)Ernest Uribe
- d)Watson and Crick
Q43.Chemistry
Which of these are used to measure optical activity?
- a)Polarimeter
- b)Planometer
- c)Psychrometer
- d)Photometer
Q44.Biology
Protein folding is a process in which a polypeptide folds in to ________.
- a)2-D structure
- b)Globular form
- c)3-D structure
- d)Linear form
Q45.Physics
If the bandgap between valence band and conduction band in a material is 5.0 eV, then the material is
- a)semiconductor
- b)good conductor
- c)super conductor
- d)insulator
Q46.Physics
During the emission of a positron from a nucleus, the mass number of the daughter element remains the same but the atomic number
- a)is decreased by 1 unit
- b)is decreased by 2 units
- c)is increased by 1 unit
- d)remains unchanged
Q47.Biology
A man of blood group-A marries a woman of blood group-AB, which type of progeny would indicate that man is heterozygous?
- a)O
- b)B
- c)A
- d)AB
Q48.Chemistry
Aspirin is a/an
- a)antibiotic
- b)antiseptic
- c)antipyretic
- d)None of the above
Q49.Physics
A body is floating in a liquid at rest. Incorrect statement about situation options:
- a)Buoyancy is equal to weight of body.
- b)Weight of liquid displaced by body is equal to buoyancy.
- c)Force applied by body on liquid is buoyancy downward.
- d)Weight will be greater than buoyancy.
Q50.Physics
A bullet on penetrating 30 cm into its target loses it's velocity by 50%. What additional distance will it penetrate into the target before it comes to rest?
- a)30 cm
- b)20 cm
- c)10 cm
- d)5 cm
Q51.Physics
Water is flowing through a very narrow tube. The velocity of water below which the flow remains a streamline flow is known as
- a)relative velocity
- b)terminal velocity
- c)critical velocity
- d)particle velocity
Q52.Physics
An electric bulb marked as 50 W-200 V is connected across a 100 V supply. The present power of the bulb is
- a)37.5 W
- b)25 W
- c)12.5 W
- d)10 W
Q53.Human Physiology
Which of the following vitamin is water soluble as well as an antioxidant?
- a)Vitamin-B1
- b)Vitamin-A
- c)Vitamin-D
- d)Vitamin-C
Q54.Chemistry
Which one of the following is wrong about molecularity of a reaction?
- a)It may be whole number or fractional.
- b)It is calculated from reaction mechanism.
- c)It is the number of molecules of the reactants taking part in a single step chemical reaction.
- d)It is always equal to the order of elementary reaction.
Q55.Physics
In which of the following pairs, the two physical quantities have different dimensions?
- a)Planck's constant and angular momentum
- b)Impulse and linear momentum
- c)Moment of inertia and moment of a force
- d)Energy and torque
Q56.Physics
In which of the following phenomena, the heat waves travel along straight lines with the speed of light?
- a)Thermal conduction
- b)Forced convection
- c)Natural convection
- d)Thermal radiation
Q57.Physics
For the radioactive nuclei that undergo either α or β decay, which one of the following cannot occur?
- a)Isobar of original nucleus is produced.
- b)Isotope of the original nucleus is produced.
- c)Nuclei with higher atomic number than that of the original nucleus is produced.
- d)Nuclei with lower atomic number than that of the original nucleus is produced.
Q58.Human Physiology
'Adaptation' of eyes in dark due to
- a)depletion of vision pigment in rods
- b)depletion of vision pigment in cones
- c)repletion of vision pigment in rods
- d)repletion of vision pigment in cones
Q59.Physics
The unit of radioactivity is
- a)Co
- b)Ci
- c)Cr
- d)Cq
Q60.Chemistry
The temporary hardness of water is caused by
- a)Oxides
- b)Bicarbonates
- c)Chlorides
- d)Sulphates
Q61.Chemistry
SiO2 is reacted with Sodium Carbonate. What is the gas liberated?
- a)CO2
- b)CO
- c)O2
- d)O3
Q62.Physics
The potential energy of a molecule on the surface of a liquid compared to one inside the liquid is
- a)zero
- b)lesser
- c)equal
- d)greater
Q63.Physics
For a metallic wire, the ratio v/i [v = applied potential difference and i = current flowing] is
- a)independent of temperature.
- b)increases as the temperature rises.
- c)decreases as the temperature rises.
- d)increases or decreases as the temperature rises depending upon the metal.
Q64.Physics
In gamma ray emission from a nucleus
- a)only proton number changes.
- b)only neutron number changes.
- c)there is no change in the proton number and neutron number.
- d)Both the proton number and the neutron number change.
Q65.Physics
In radiactive decay process, the negatively charged emitted β particles are
- a)the electrons present inside the nucleus.
- b)the electrons produced as a result of the decay of neutrons inside the nucleus.
- c)the electrons produced as a result of collisions between atoms.
- d)None of the above

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