WBCS MAIN 2023 P-4 Science-Technology & EVS

WBCS MAIN 2023 P-4 Science-Technology & EVS MCQ

WBCS MAIN 2023 P-4 Science-Technology & EVS One Liner

Topic 1: Physics

1. How many degrees of freedom does an H₂ molecule have?
Ans: 5

2. What type of transmission is a television (TV) broadcast an example of?
Ans: Simplex

3. Which property of light remains unchanged during refraction?
Ans: Frequency

4. What happens to the radius of a soap bubble when it is given a negative charge?
Ans: Increases

5. What is a poundal a unit of?
Ans: Weight (force in FPS system)

6. Which theorem explains the working principle of a sprayer?
Ans: Bernoulli’s theorem

7. Which quantity remains unchanged in a transformer?
Ans: Frequency

8. How much hotter is the Sun’s temperature compared to Earth’s (in K)?
Ans: More than 5000 K

9. Which law gives the direction of induced e.m.f. during electromagnetic induction?
Ans: Lenz’s Law

10. What is generated when a fixed torque is applied to a body?
Ans: Angular acceleration

11. What happens to the internal energy of a gas during adiabatic expansion?
Ans: Decreases

12. What does a car’s speedometer measure?
Ans: Instantaneous speed

13. Which type of modulation is employed in India for radio transmission?
Ans: Amplitude modulation

14. What is the value of 1 X-unit in meters?
Ans: 10⁻¹³ m

15. Why is 220 V AC more dangerous than 220 V DC?
Ans: Because the peak voltage for AC is much larger than 220 volts

16. How can a magnetic field be produced?
Ans: By both moving charge and a changing electric field

17. Which material has a positive temperature coefficient of resistance?
Ans: Copper

18. What is the charge condition of an n-type semiconductor?
Ans: Neutral

19. Which phenomenon is NOT common to both sound and light waves?
Ans: Polarisation

20. Which is more elastic among copper, rubber, sponge, and steel?
Ans: Steel

21. What is a cyclotron used for?
Ans: Accelerating protons

22. What is the frequency of AC supply in India?
Ans: 50 Hz

23. Where is the energy stored in a charged capacitor?
Ans: In the field between the plates

24. Who discovered the magnetic effect of current?
Ans: Oersted

25. What is the frequency change in the energy of a simple pendulum?
Ans: f/2

26. Which eye defect occurs when the power of the eye lens increases?
Ans: Short-sightedness (Myopia)

27. What color does the sky appear to an astronaut in a spaceship?
Ans: Black

28. What is the shape of the graph between pressure (P) and 1/V for a real gas at constant temperature?
Ans: Straight line

29. What is the pressure within the lungs called?
Ans: Intra-pulmonary pressure

30. Which of the following is a vector quantity: current, current density, power, or wattless current?
Ans: Current density

31. At what voltage and current is alternating current transmitted to distant places?
Ans: High voltage and low current

Topic 2: Chemistry

32. In which branch of chemistry is the law of definite proportion obeyed?
Ans: Stoichiometry

33. Which element among boron, silicon, gallium, and germanium is NOT a metalloid?
Ans: Gallium

34. Which element is required for the synthesis of chlorophyll?
Ans: Magnesium (Mg)

35. What is the best quality of coal?
Ans: Anthracite

36. Which mixture is most likely to exhibit the Tyndall effect?
Ans: Chalk powder and water mixture

37. Which type of transitions are studied by a UV spectrometer?
Ans: Electronic transitions

38. What is the color of CuS?
Ans: Black

39. What is vinegar a dilute solution of?
Ans: Acetic acid

40. Which structure has delocalized π-electrons?
Ans: O₃ (Ozone)

41. Which is a naturally occurring polymer among starch, teflon, neoprene, and nylon?
Ans: Starch

42. What happens when PbO reacts with H₂?
Ans: Reduction of lead

43. Which carbohydrate is NOT a monosaccharide: glucose, fructose, ribose, or lactose?
Ans: Lactose

44. What happens to the boiling point of water when a non-volatile solid is added to it?
Ans: Increases

45. How many carbon atoms make up a fullerene molecule?
Ans: 60

46. What is the correct order of increasing energy of orbitals within the same energy level?
Ans: s < p < d < f

47. Which species does NOT contain at least one 90° bond angle?
Ans: CF₄

48. Why is graphite a good conductor of electricity?
Ans: Due to free delocalized electrons

49. Which liquid leaves behind a residue on heating: brine, bromine, mercury, or alcohol?
Ans: Brine

Topic 3: Biology

50. What is the maximum application of animal cell culture technology today?
Ans: Production of vaccines

51. What are triglycerides broken down into?
Ans: Fatty acids and glycerol

52. Which disease is treated with the drug Artemesin?
Ans: Malaria

53. Which organism does NOT exhibit sexual reproduction?
Ans: Bacteria

54. Why do we keep food in a refrigerator?
Ans: To prevent bacterial and fungal infection

55. What is the approximate size of an E. coli bacterium?
Ans: 2000 nm

56. Where are lumbar vertebrae found in the human body?
Ans: Abdominal region

57. Which is the primary organ affected by COVID-19?
Ans: Lung

58. Where are vocal cords located?
Ans: Larynx

59. What is the size range of nanoparticles?
Ans: 1 to 100 nm

60. Which gas causes the formation of carbaminohemoglobin?
Ans: CO₂

61. What does the absence of which factor denote water purity?
Ans: Coliform

62. Which hepatitis viruses are transmitted through blood?
Ans: Hepatitis B and C

63. Where is the hormone secretin produced?
Ans: Intestine

64. Which is NOT a constituent of the cell membrane: glycolipids, phospholipids, cholesterol, or proline?
Ans: Proline

65. In which plant was the first transgenic plant produced?
Ans: Tobacco

66. On which organism was the Nobel Prize-winning work on RNA interference carried out?
Ans: C. elegans

67. Which organ is boron useful for?
Ans: Bones

68. Which antibiotic is produced by bacteria?
Ans: Streptomycin

69. Which component is absent in an animal cell membrane?
Ans: Ergosterol

70. What are probiotics?
Ans: Live microbial food supplements

71. Which vitamin is produced in the human body due to sunlight exposure?
Ans: Vitamin D₃

72. What brings about nitrogen fixation in paddy fields?
Ans: Cyanobacteria

73. What is the name of the new antibiotic discovered to fight drug-resistant bacteria?
Ans: Odilorhabdins

74. What is Alec Jeffery associated with?
Ans: DNA fingerprinting

75. Which type of water is available to plant roots?
Ans: Capillary water

Topic 4: Computer & Information Technology

76. What was India’s first nuclear reactor?
Ans: APSARA

77. What is the name of the first female robot to be part of India’s first manned space mission?
Ans: Vyom mitra

78. When was Chandrayaan-3 launched?
Ans: 14 July, 2023

79. Which launcher was used for Chandrayaan-3?
Ans: GSLV-MK 3

80. What does OTEC involve thermal power generation from?
Ans: Sea

81. Where is the OTEC plant in India located?
Ans: Andaman & Nicobar Island

82. What is the name of the sounding rocket launched by ISRO for atmospheric studies?
Ans: RH-300

83. What are the main objectives of an industrial robot?
Ans: All of the above – Minimize labour, increase productivity, enhance machine life

84. What was the first geostationary satellite launched in 1964 called?
Ans: SYNCOM-3

85. What is the source of UV radiation?
Ans: Hydrogen gas discharge lamp

86. What is the name of the world’s first robotic check-in assistant launched by Emirates?
Ans: Sara

TOPIC-WISE SUMMARY – SECTION A

Topic No.Topic NameQuestion Numbers
1Physics1-31
2Chemistry32-49
3Biology50-75
4Computer & Information Technology76-86

WBCS MAIN 2023 P-4 Science-Technology & EVS MCQ

Topic 1: Physics

1. The degrees of freedom of H₂ molecule is

A. 2
B. 3
C. 5
D. 6

Correct Answer: C. 5

2. A television (TV) transmission is an example of which type of transmission?

A. Simplex
B. Half-duplex
C. Full-duplex
D. Bidirectional

Correct Answer: A. Simplex

3. When light is refracted, which of the following does not change?

A. Wavelength
B. Frequency
C. Velocity
D. Amplitude

Correct Answer: B. Frequency

4. A soap bubble is given a negative charge, then its radius

A. decreases
B. increases
C. remains unchanged
D. nothing can be predicted as information is insufficient

Correct Answer: B. increases

5. Poundal is a unit of

A. mass
B. weight
C. momentum
D. energy

Correct Answer: B. weight

6. Which theorem/law can explain the working principle of sprayer?

A. Stoke’s law
B. Bernoulli’s theorem
C. Jurin’s law
D. Virial theorem

Correct Answer: B. Bernoulli’s theorem

7. Quantity that remains unchanged in a transformer is

A. Voltage
B. Current
C. Frequency
D. Current density

Correct Answer: C. Frequency

8. Noise in temperature of Sun compared to Earth is more than __ K.

A. 1000
B. 500
C. 5000
D. 1,00,000

Correct Answer: C. 5000

9. The direction of induced e.m.f. during electromagnetic induction is given by

A. Faraday’s Law
B. Lenz’s Law
C. Maxwell’s Law
D. Ampere’s Law

Correct Answer: B. Lenz’s Law

10. Fixed torque is applied to a body. What will be generated in the body?

A. Angular acceleration
B. Linear acceleration
C. Angular velocity
D. Angular displacement

Correct Answer: A. Angular acceleration

11. The internal energy of gas due to adiabatic expansion will be

A. decreased
B. increased
C. same
D. dissipated

Correct Answer: A. decreased

12. What do we see at speedometer of a car?

A. Average speed
B. Average velocity
C. Instantaneous speed
D. Instantaneous velocity

Correct Answer: C. Instantaneous speed

13. Which type of modulation is employed in India for radio transmission?

A. Amplitude modulation
B. Frequency modulation
C. Pulse modulation
D. Phase modulation

Correct Answer: A. Amplitude modulation

14. X-unit = ?

A. 10⁻¹⁵ m
B. 10⁻¹² m
C. 10⁻¹⁰ m
D. 10⁻¹³ m

Correct Answer: D. 10⁻¹³ m

15. A 220 volt A.C. is more dangerous than 220 volt D.C. because

A. the A.C. attracts
B. the D.C. repels
C. the body offers less resistance to A.C.
D. peak voltage for A.C. is much larger than 220 volt

Correct Answer: D. peak voltage for A.C. is much larger than 220 volt

16. A magnetic field can be produced by —

A. Moving charge
B. A changing electric field
C. Both (A) and (B)
D. None of the above

Correct Answer: C. Both (A) and (B)

17. The positive temperature coefficient of resistance is for —

A. Carbon
B. Germanium
C. Copper
D. Electrolyte

Correct Answer: C. Copper

18. An n-type semiconductor is —

A. Negatively charged
B. Positively charged
C. Neutral
D. Depends on impurity

Correct Answer: C. Neutral

19. Which of the following phenomenon is not common to sound and light waves?

A. Interference
B. Diffraction
C. Polarisation
D. Reflection

Correct Answer: C. Polarisation

20. Which one of the following is more elastic?

A. Copper
B. Rubber
C. Sponge
D. Steel

Correct Answer: D. Steel

21. Cyclotron is a device used for —

A. Measuring charge
B. Measuring voltage
C. Accelerating electrons
D. Accelerating protons

Correct Answer: D. Accelerating protons

22. What is the frequency of AC supply in India?

A. 220 Hz
B. 60 Hz
C. 50 Hz
D. 40 Hz

Correct Answer: C. 50 Hz

23. In a charged capacitor, the energy resides in —

A. Positive charges
B. Both positive and negative charges
C. Field between the plates
D. Around the edge of plates

Correct Answer: C. Field between the plates

24. Magnetic effect of current was discovered by —

A. Faraday
B. Oersted
C. Ampere
D. Bohr

Correct Answer: B. Oersted

25. Frequency change in energy of simple pendulum is —

A. f/2
B. f
C. 2f
D. 4f

Correct Answer: A. f/2

26. When power of eye lens increases, defect produced is —

A. Short-sightedness
B. Long-sightedness
C. Colour blindness
D. Astigmatism

Correct Answer: A. Short-sightedness

27. An astronaut in a spaceship sees the sky as —

A. Red
B. Blue
C. Indigo
D. Black

Correct Answer: D. Black

28. At constant temperature, graph between pressure (P) and 1/V of real gas is —

A. Hyperbola
B. Parabola
C. Circle
D. Straight line

Correct Answer: D. Straight line

29. Pressure within the lungs is called

A. Inter-pulmonary pressure
B. Intra-pulmonary pressure
C. Interstitial pressure
D. Alveolar pressure

Correct Answer: B. Intra-pulmonary pressure

30. Which of the following is a vector quantity

A. Current
B. Current density
C. Power
D. Wattless current

Correct Answer: B. Current density

31. Alternating current is transmitted to distant places at

A. high voltage and low current
B. high voltage and high current
C. low voltage and low current
D. low voltage and high current

Correct Answer: A. high voltage and low current

Topic 2: Chemistry

32. Law of definite proportion is obeyed in

A. Stoichiometry
B. electrometry
C. photometry
D. spectrometer

Correct Answer: A. Stoichiometry

33. Which one of the following is not a metalloid?

A. Boron
B. Silicon
C. Gallium
D. Germanium

Correct Answer: C. Gallium

34. The element that is required for the synthesis of chlorophyll is

A. Mn
B. Fe
C. Mg
D. Mo

Correct Answer: C. Mg (Magnesium)

35. The best quality coal is

A. Anthracite
B. Peat
C. Bituminous
D. Lignite

Correct Answer: A. Anthracite

36. Which one of the following is most likely to exhibit Tyndall effect?

A. Sugar and water mixture
B. Potash alum and water mixture
C. Chalk powder and water mixture
D. Potassium permanganate and water mixture

Correct Answer: C. Chalk powder and water mixture

37. Which transitions are studied by UV spectrometer?

A. Rotational
B. Electronic
C. Nuclear
D. Vibrational

Correct Answer: B. Electronic

38. The colour of CuS is

A. Black
B. Blue
C. Yellow
D. Red

Correct Answer: A. Black

39. Vinegar is a dilute solution of —

A. Ethyl alcohol
B. Acetic acid
C. Formic acid
D. Vanadium

Correct Answer: B. Acetic acid

40. Which structure has delocalized π-electrons?

A. O₃
B. CO
C. HCN
D. CO₂

Correct Answer: A. O₃

41. Which of the following is a naturally occurring polymer?

A. Starch
B. Teflon
C. Neoprene
D. Nylon

Correct Answer: A. Starch

42. Reaction of PbO and H₂ leads to —

A. Reduction of lead
B. Oxidation of lead
C. Formation of PbCl₂
D. Formation of PbO

Correct Answer: A. Reduction of lead

43. Which of the following carbohydrate is not a monosaccharide?

A. Glucose
B. Fructose
C. Ribose
D. Lactose

Correct Answer: D. Lactose

44. A non-volatile solid is added to water. Its boiling point will —

A. Decrease
B. Increase
C. Not change
D. Not predictable

Correct Answer: B. Increase

45. Fullerene is made up of how many carbon atoms?

A. 100
B. 20
C. 75
D. 60

Correct Answer: D. 60

46. Order of increasing energy of orbitals within same energy level —

A. d < s < f < p
B. s < p < d < f
C. p < s < f < d
D. f < d < p < s

Correct Answer: B. s < p < d < f

47. Which species does not contain at least one 90° bond angle?

A. CF₄
B. PF₅
C. SF₆
D. SiF₆²⁻

Correct Answer: A. CF₄

48. Graphite is a good conductor of electricity due to

A. strong electrostatic bonding
B. free localized bonds
C. free delocalized electrons
D. tetrahedral arrangement of particles

Correct Answer: C. free delocalized electrons

49. One of the following liquids will leave behind a residue on heating. This one is

A. Brine
B. Bromine
C. Mercury
D. Alcohol

Correct Answer: A. Brine

Topic 3: Biology

50. Maximum application of animal cell culture technology today is in the production of

A. Insulin
B. Interferons
C. edible Proteins
D. vaccines

Correct Answer: D. vaccines

51. Triglycerides are broken down to

A. Fatty acids
B. Amino acids
C. Glycerol
D. Fatty acid and glycerol

Correct Answer: D. Fatty acid and glycerol

52. Artemesin is a drug used in

A. Dengue
B. Malaria
C. Typhoid
D. Pertussis

Correct Answer: B. Malaria

53. The following organism does not exhibit sexual reproduction:

A. Bacteria
B. Cyanobacteria
C. Fungi
D. Algae

Correct Answer: A. Bacteria

54. We keep food in refrigerator to prevent food from going bad due to

A. viral infection
B. fungal infection
C. bacterial infection
D. both (B) and (C)

Correct Answer: D. both (B) and (C)

55. The size of E. Coli bacteria is

A. 2000 nm
B. 200 nm
C. 20 nm
D. 2 nm

Correct Answer: A. 2000 nm

56. Lumbar vertebrae are found in

A. Abdominal region
B. Thorax
C. Neck region
D. Hip region

Correct Answer: A. Abdominal region

57. The primary organ affected by COVID-19 is

A. Lung
B. Liver
C. Kidney
D. Spleen

Correct Answer: A. Lung

58. Vocal Cords occur in

A. pharynx
B. larynx
C. glottis
D. bronchial tube

Correct Answer: B. larynx

59. The size of the nanoparticles between __ nm.

A. 100 to 1000
B. 0.1 to 10
C. 1 to 100
D. 0.01 to 1

Correct Answer: C. 1 to 100 nm

60. Which of the following gases causes the formation of Carbamino haemoglobin?

A. CO
B. CO₂
C. NO₂
D. SO₂

Correct Answer: B. CO₂

61. Water purity is denoted by the absence of

A. CO₂
B. CO
C. Coliform
D. Entero bacteria

Correct Answer: C. Coliform

62. The following Hepatitis virus is transmitted through blood.

A. Hep. A
B. Hep. B
C. Hep. C
D. (B) and (C)

Correct Answer: D. (B) and (C)

63. Hormone secretin is produced by —

A. Stomach
B. Liver
C. Intestine
D. Pancreas

Correct Answer: C. Intestine

64. Which is not a constituent of cell membrane?

A. Glycolipids
B. Phospholipids
C. Cholesterol
D. Proline

Correct Answer: D. Proline

65. The first transgenic plant was produced in —

A. Rice
B. Tobacco
C. Maize
D. Cotton

Correct Answer: B. Tobacco

66. In 2006, Nobel Prize for RNA interference was won on the work carried out on —

A. D. melanogaster
B. A. thaliana
C. C. elegans
D. S. pombe

Correct Answer: C. C. elegans

67. Boron is useful for which organ?

A. Liver
B. Kidney
C. Brain
D. Bones

Correct Answer: D. Bones

68. The following antibiotic is produced by bacteria —

A. Penicillin
B. Chloramphenicol
C. Bacitracin
D. Streptomycin

Correct Answer: D. Streptomycin

69. Which component is absent in animal cell membrane?

A. Cholesterol
B. Ergosterol
C. Phospholipid
D. Oligosaccharide

Correct Answer: B. Ergosterol

70. Probiotics are —

A. Cancer-inducing microbes
B. Safe antibiotics
C. Food allergens
D. Live microbial food supplement

Correct Answer: D. Live microbial food supplement

71. Which vitamin is produced in human body due to sunlight?

A. Vitamin B₆
B. Vitamin B₁₂
C. Vitamin C
D. Vitamin D₃

Correct Answer: D. Vitamin D₃

72. Nitrogen fixation in paddy field is brought by —

A. Bacteria
B. Fern
C. Cyanobacteria
D. Algae

Correct Answer: C. Cyanobacteria

73. New antibiotic discovered to fight drug-resistant bacteria —

A. Philo-habdins
B. Odilorhabdins
C. Oli-habdins
D. Ozo-habdins

Correct Answer: B. Odilorhabdins

74. Alec Jeffery’s name is associated with

A. DNA sequencing
B. DNA fingerprinting
C. RNA sequencing
D. Site directed mutagenesis

Correct Answer: B. DNA fingerprinting

75. The water which is available to plant roots is

A. Gravitational water
B. Chemically combined water
C. Hygroscopic water
D. Capillary water

Correct Answer: D. Capillary water

Topic 4: Computer & Information Technology

76. What is the India’s first nuclear reactor?

A. RAMBHA
B. MENAKA
C. URVASI
D. APSARA

Correct Answer: D. APSARA

77. What is the name of the first female robot to be part of India’s first manned space mission?

A. Sangha mitra
B. Ganga mitra
C. Vyom mitra
D. Gagan mitra

Correct Answer: C. Vyom mitra

78. What was the launch date of Chandrayaan-3?

A. 24 July, 2023
B. 14 July, 2023
C. 13 July, 2023
D. 04 July, 2023

Correct Answer: B. 14 July, 2023

79. Which launcher was used for Chandrayaan-3?

A. GSLV
B. LVSM
C. GSLV-MK 3
D. PSLV

Correct Answer: C. GSLV-MK 3

80. OTEC involves thermal power generation from

A. Sea
B. River
C. Wetland
D. Lake

Correct Answer: A. Sea

81. The OTEC plant in India is located in —

A. Andaman & Nicobar Island
B. Lakshadweep
C. Gujarat
D. Odisha

Correct Answer: A. Andaman & Nicobar Island

82. ISRO launched sounding rocket for atmospheric studies. What is its name?

A. Cartosat
B. Agni-IV
C. RH-300
D. BrahMos-II

Correct Answer: C. RH-300

83. The main objectives of industrial robot is —

A. Minimize labour requirement
B. Increase productivity
C. Enhance life of machines
D. All of the above

Correct Answer: D. All of the above

84. The first geostationary satellite launched in 1964 was called —

A. ANIK
B. SYNCOM-3
C. WESTAR
D. MOLNIYA

Correct Answer: B. SYNCOM-3

85. What is the source of UV radiation?

A. Hydrogen gas discharge lamp
B. RF oscillator
C. Klystron oscillator
D. Nernst filament

Correct Answer: A. Hydrogen gas discharge lamp

86. World’s first robotic check-in assistant launched by Emirates is —

A. Sara
B. Kiwi
C. Siri
D. Rini

Correct Answer: A. Sara

TOPIC-WISE SUMMARY – SECTION A

Topic No.Topic NameQuestion Numbers
1Physics1-31
2Chemistry32-49
3Biology50-75
4Computer & Information Technology76-86