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 Name | Question Numbers |
|---|---|---|
| 1 | Physics | 1-31 |
| 2 | Chemistry | 32-49 |
| 3 | Biology | 50-75 |
| 4 | Computer & Information Technology | 76-86 |
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 Name | Question Numbers |
|---|---|---|
| 1 | Physics | 1-31 |
| 2 | Chemistry | 32-49 |
| 3 | Biology | 50-75 |
| 4 | Computer & Information Technology | 76-86 |