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Chemistry Test 63
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Chemistry Test 63
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  • Question 1/10
    1 / -0
    Which of the following substance's smell is similar to Ethanoic acid?
    Solutions
    Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9% acetic acid by volume, making acetic acid the main component of vinegar apart from water.
  • Question 2/10
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    Which of the following acids serves as an electrolyte in a lead storage battery?
    Solutions
    Dilute sulfuric acid (H2S04) serves as the electrolyte in a lead-acid battery. Dilute sulfuric acid used for lead acid battery has ratio (to water) of 3:1 other components of the battery include: Lead peroxide (PbO2) and Sponge lead (Pb).
  • Question 3/10
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    Which of the following range of Air Pollutant Index is considered as hazardous ?
    Solutions
    An Air Quality Index(AQI) of 301-500 is considered as hazardous to human health. It denotes the severely polluted state of air. AQI values over 300 trigger health warnings of emergency conditions. The entire population is even more likely to be affected by serious health effects.
  • Question 4/10
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    The biological decomposition of organic substances in wastes under controlled conditions known as
    Solutions

    • Composting is an aerobic method of decomposing organic solid wastes. It can therefore be used to recycle organic material.

    • The process involves decomposition of organic material into a humus-like material, known as compost, which is a good fertilizer for plants.

  • Question 5/10
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    Lactose is present in
    Solutions
    • Lactose is a natural sugar found in milk and dairy products.
    • An enzyme called lactase is needed for your body to break down (digest) and absorb lactose.
  • Question 6/10
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    Hard water and soft water can be distinguished by using?
    Solutions
    •  Hard water is any water containing an appreciable quantity of dissolved minerals.

    • Soap is less effective in hard water because it reacts to form the calcium or magnesium salt of the organic acid of the soap.
  • Question 7/10
    1 / -0
    Which of the following fuels causes minimum environmental pollution?
    Solutions
    Hydrogen causes minimum environmental pollution. When hydrogen is burnt to produce fuel, the byproducts are totally safe, which means, they have no known side effects. 
  • Question 8/10
    1 / -0
    Water cycle refers to_____
    Solutions
    • Water cycle that involves the continuous circulation of water in the Earth-atmosphere system.
    • There are four main stages in the water cycle. They are evaporation, condensation, precipitation and collection.
  • Question 9/10
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    Which of the following supports particle nature of photons ?
    Solutions
    Light is made up of photons, so it has some particle properties. In the photoelectric effect, light hits some material which absorbs it, and then ejects incident electrons. The reason that the photoelectric effect is evidence for the particle nature of light has to do with how materials absorb that light energy and then eject it in the form of electrons.
  • Question 10/10
    1 / -0
    In the nuclear reactors, moderators are used to:
    Solutions
    A moderator is a medium that reduces the speed of fast neutrons, thereby turning them into thermal neutrons capable of sustaining a nuclear chain reaction involving uranium-235. Commonly used moderators include regular (light) water (roughly 75% of the world’s reactors), solid graphite (20% of reactors) and heavy water (5% of reactors).
    Why moderators ?
    When an incoming neutron causes the nucleus of an atom to split, other neutrons are released at very high speed. If at least one (on average) of these neutrons can be made to cause split another fuel atom, a sustained chain reaction is possible. As it happens, fuel atoms (like uranium) are more likely to absorb a neutron whizzing by if it’s going slow. So, many reactor designs use moderators to make a chain reaction easier to attain.
    Hence option C is the right answer.
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