Practice test
Wbcs preliminary (general science) sectional test – 15 - Test Set 1
Review 25 exam-focused questions with detailed explanations, then start the interactive test when you are ready.
25 questions
Questions and explanations
- Which phenomenon is responsible for the twinkling of stars when viewed from the Earth's surface?
Question 1
- Total Internal Reflection
- Atmospheric Refraction
- Diffuse Reflection
- Rayleigh Scattering
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- Which allotrope of Carbon is used as a dry lubricant in heavy machinery due to its layered structure?
Question 2
- Diamond
- Fullerene
- Graphite
- Graphene
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- Which blood group is known as the 'Universal Donor' because its red blood cells lack A and B antigens?
Question 3
- AB Positive
- O Negative
- A Negative
- B Positive
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- Which gas is the primary component responsible for the phenomenon of 'Acid Rain'?
Question 4
- Carbon Monoxide
- Methane
- Sulfur Dioxide
- Argon
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- What is the escape velocity required for an object to break free from the Earth's gravitational pull?
Question 5
- 9.8 km/s
- 11.2 km/s
- 7.9 km/s
- 42.1 km/s
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- Which process is commonly used to protect iron from rusting by coating it with a thin layer of Zinc?
Question 6
- Galvanization
- Annealing
- Vulcanization
- Electrolysis
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- Which endocrine gland is often referred to as the 'Master Gland' of the human body?
Question 7
- Thyroid Gland
- Adrenal Gland
- Pituitary Gland
- Pancreas
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- In computer terminology, which of the following is considered 'volatile' memory?
Question 8
- ROM
- Hard Disk
- RAM
- Flash Drive
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- What is the value of the 'Absolute Zero' temperature on the Celsius scale?
Question 9
- 0°C
- -100°C
- -273.15°C
- -32°C
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- Which of the following acids is primarily found in Vinegar?
Question 10
- Citric Acid
- Lactic Acid
- Acetic Acid
- Tartaric Acid
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- Which cell organelle is known as the 'Suicide Bag' because it contains digestive enzymes?
Question 11
- Ribosome
- Lysosome
- Golgi Body
- Vacuole
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- Which layer of the atmosphere is most effective at absorbing harmful Ultraviolet (UV) radiation from the sun?
Question 12
- Troposphere
- Stratosphere
- Mesosphere
- Ionosphere
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- Which type of lens is used to correct the vision defect known as Myopia (Nearsightedness)?
Question 13
- Concave Lens
- Convex Lens
- Cylindrical Lens
- Bifocal Lens
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- What is the primary chemical used in the process of 'Vulcanization' to make natural rubber stronger?
Question 14
- Sulfur
- Phosphorus
- Carbon
- Silicon
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- Which vitamin is essential for the process of blood clotting and its deficiency can lead to excessive bleeding?
Question 15
- Vitamin A
- Vitamin C
- Vitamin K
- Vitamin E
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- Which law of motion states that 'For every action, there is an equal and opposite reaction'?
Question 16
- Newton's First Law
- Newton's Second Law
- Newton's Third Law
- Law of Conservation of Mass
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- Which of the following is an example of a 'Noble Gas' that is used in high-speed photography and strobe lights?
Question 17
- Hydrogen
- Xenon
- Nitrogen
- Chlorine
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- Which organ in the human body is primarily responsible for the filtration of blood and removal of nitrogenous waste?
Question 18
- Liver
- Heart
- Kidney
- Lungs
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- Which term describes the accumulation of toxic substances in a food chain, increasing in concentration at higher levels?
Question 19
- Eutrophication
- Biomagnification
- Photosynthesis
- Decomposition
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- What is the main function of the 'ALU' (Arithmetic Logic Unit) in a computer's CPU?
Question 20
- Storing permanent files
- Managing external hardware devices
- Controlling the flow of electricity
- Performing mathematical and logical operations
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- Which unit is used to measure the intensity of sound?
Question 21
- Hertz
- Watt
- Joule
- Decibel
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- Which chemical compound is commonly used as a refrigerant and is known to deplete the ozone layer?
Question 22
- Carbon Dioxide
- Nitrous Oxide
- Ammonia
- Chlorofluorocarbons (CFCs)
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- Which pigment in green plants is primarily responsible for absorbing sunlight during photosynthesis?
Question 23
- Carotene
- Hemoglobin
- Chlorophyll
- Melanin
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- Which radioactive isotope is commonly used in 'Carbon Dating' to determine the age of organic remains?
Question 24
- Carbon-12
- Carbon-13
- Carbon-14
- Uranium-235
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- In physics, what is the SI unit of 'Power'?
Question 25
- Joule
- Newton
- Watt
- Pascal
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