Chemistry questions and answers

  • Q1:

    Which one of the following conversions takes place in the process of photosynthesis?

    1. (A)Heat energy to kinetic energey
    2. (B)Thermal energy to chemical energy
    3. (C)Thermal energy to electromagnetic energy
    4. (D)Electromagnetic energy to chemical energy

  • Q2:

    Machine parts get jammed in winter, because

    1. (A)the viscosity of the lubricant used in machine parts increases with the decrease in temperature
    2. (B)the viscosity of lubricant used in machine parts decreases with the decrease in temperature
    3. (C)the inertia of machine parts decreases with the decreases in temperature
    4. (D)the inertia of machine parts increases with the decrease in temperature

  • Q3:

    Given that the atomic weight of chemical element 'X' is 40 and that of chemical element 'Y' is 16, 20 grams of element 'X' will contain the same number of atoms as

    1. (A)8 grams of 'Y'
    2. (B)16 grams of 'Y'
    3. (C)20 grams of 'Y'
    4. (D)40 grams of 'Y'
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  • Q4:

    Cyclotron is a device which

    1. (A)detects and analyses the spectrum of light emitted by stars
    2. (B)Accelerates sub-atomic particles using combined electric and magnetic fields
    3. (C)detects the cyclic variation in the intensity of electromagnetic radiation emitted from stars
    4. (D)measures the intensity of X-rays
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  • Q5:

    Small droplets of a liquid are spherical in shape because of

    1. (A)viscosity
    2. (B)surface tension
    3. (C)thermal conductivity
    4. (D)density
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