Practice test

Wbcs preliminary (general science) sectional test – 13 - 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

  1. Question 1

    At what temperature does water have its maximum density?
    1. 0°C
    2. 4°C
    3. -4°C
    4. 100°C
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  2. Question 2

    Which component is the primary constituent of 'Heavy Water' used in nuclear reactors?
    1. Tritium
    2. Deuterium
    3. Protium
    4. Helium
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  3. Question 3

    Which organelle is famously known as the 'Powerhouse of the Cell'?
    1. Ribosome
    2. Nucleus
    3. Mitochondria
    4. Lysosome
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  4. Question 4

    What is the full form of 'BIOS' in computer systems?
    1. Binary Input Output System
    2. Basic Input Output System
    3. Board Input Output System
    4. Business Input Output System
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  5. Question 5

    Which gas is the most abundant in the Earth's atmosphere by volume?
    1. Oxygen
    2. Carbon Dioxide
    3. Nitrogen
    4. Argon
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  6. Question 6

    Which unit is used to measure the frequency of sound waves?
    1. Decibel
    2. Hertz
    3. Joule
    4. Watt
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  7. Question 7

    Which alloy is primarily composed of Copper and Tin?
    1. Brass
    2. Bronze
    3. Solder
    4. German Silver
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  8. Question 8

    Which vitamin deficiency is the primary cause of 'Night Blindness' (Nyctalopia)?
    1. Vitamin B12
    2. Vitamin C
    3. Vitamin A
    4. Vitamin D
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  9. Question 9

    Which part of the electromagnetic spectrum is used in household TV remote controls?
    1. Ultraviolet rays
    2. Infrared rays
    3. X-rays
    4. Gamma rays
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  10. Question 10

    What is the pH value of pure, neutral water at room temperature?
    1. 1
    2. 7
    3. 14
    4. 0
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  11. Question 11

    Which substance is used in the tips of safety matches that ignites upon friction?
    1. Red Phosphorus
    2. White Phosphorus
    3. Sulfur
    4. Potassium Chlorate
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  12. Question 12

    Which human body part is primarily affected by the disease 'Glaucoma'?
    1. Liver
    2. Lungs
    3. Eyes
    4. Heart
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  13. Question 13

    What is the primary function of the 'Shift' key on a computer keyboard?
    1. To delete files permanently
    2. To toggle capital letters and symbols
    3. To restart the computer
    4. To save the current document
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  14. Question 14

    Which law of physics explains the upward buoyant force exerted on a body immersed in a fluid?
    1. Pascal's Law
    2. Archimedes' Principle
    3. Bernoulli's Principle
    4. Ohm's Law
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  15. Question 15

    Which chemical element is the primary component of common 'Baking Powder'?
    1. Sodium Carbonate
    2. Sodium Bicarbonate
    3. Calcium Carbonate
    4. Potassium Nitrate
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  16. Question 16

    In the human heart, which chamber is responsible for pumping oxygenated blood to the entire body?
    1. Right Atrium
    2. Left Atrium
    3. Right Ventricle
    4. Left Ventricle
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  17. Question 17

    Which atmospheric phenomenon is caused by the scattering of sunlight by dust particles and gas molecules?
    1. Rainbow formation
    2. Blue color of the sky
    3. Mirages
    4. Halo around the moon
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  18. Question 18

    Which metal is known as the 'Quick Silver' due to its liquid state at room temperature?
    1. Silver
    2. Mercury
    3. Gallium
    4. Cesium
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  19. Question 19

    Which enzyme present in human saliva begins the digestion of starch into simple sugars?
    1. Pepsin
    2. Lipase
    3. Salivary Amylase
    4. Trypsin
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  20. Question 20

    What is the main component of 'Natural Gas' used as a clean fuel?
    1. Propane
    2. Butane
    3. Methane
    4. Ethane
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  21. Question 21

    Which instrument is used to measure the intensity of an Earthquake?
    1. Barometer
    2. Seismograph
    3. Hygrometer
    4. Anemometer
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  22. Question 22

    Which non-metal is the only one to exist in a liquid state at room temperature?
    1. Chlorine
    2. Bromine
    3. Iodine
    4. Phosphorus
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  23. Question 23

    Which process describes the loss of water from the leaves of plants in the form of vapor?
    1. Photosynthesis
    2. Transpiration
    3. Respiration
    4. Osmosis
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  24. Question 24

    In computer science, what is the base value of the 'Hexadecimal' number system?
    1. 2
    2. 8
    3. 10
    4. 16
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  25. Question 25

    Which gas is used as a coolant in refrigerators and is safe for the ozone layer?
    1. Ammonia
    2. Freon
    3. Hydrofluorocarbons (HFCs)
    4. Carbon Tetrachloride
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