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General Science MCQ


Which of the following contains maximum carbon dioxide ?

  • Grasslands
  • Forests
  • Oceans
  • Agroecosystems
  • Correct Option: C  [ Oceans ]

    Explanation:

What is reason for using red light as a stop signal ?

  • Long wavelength
  • Short wavelength
  • Chromogenic effect
  • Infra Red
  • Correct Option: A  [ Long wavelength ]

    Explanation:

Most plants absorb nitrogen in the form of:

  • proteins
  • nitrates and nitrites
  • urea
  • nitrates, nitrites and urea
  • Correct Option: D  [ nitrates, nitrites and urea ]

    Explanation:

The mountaineers carry oxygen with them because:

  • at an altitude of more than 5 km there is no air
  • the amount of air available to a person on mountain is lesser than that available on the ground
  • the temperature of air is lesser than that on the ground.
  • The pressure of air is higher than that on the ground.
  • Correct Option: B  [ the amount of air available to a person on mountain is lesser than that available on the ground ]

    Explanation:

The HIV virus affects the:

  • Leucocytes
  • Lymphocytes
  • Erythrocytes
  • None of these
  • Correct Option: B  [ Lymphocytes ]

    Explanation:

Tetraethyl lead (TEL) is

  • a catalyst used in burning fossil fuel
  • an antioxidant
  • a reductant
  • an antiknock compound
  • Correct Option: D  [ an antiknock compound ]

    Explanation:

Angora wool is extracted from

  • rabbit
  • sheep
  • fox
  • goat
  • Correct Option: A  [ rabbit ]

    Explanation:

What is the rarest element on earth?

  • Radium
  • Einsteinium
  • Astatine
  • none of these
  • Correct Option: C  [ Astatine ]

    Explanation: Astatine is a very rare radioactive chemical element with the chemical symbol At and atomic number 85

The time period of a pendulum when taken to the Moon would:

  • remain the same
  • decrease
  • become zero
  • increase
  • Correct Option: D  [ increase ]

    Explanation:

The phenomenon involved in propagation of light waves throuhg optical fibres is :

  • Dispersion of light
  • Scattering of light
  • Total internal reflection of light
  • Refraction of light
  • Correct Option: C  [ Total internal reflection of light ]

    Explanation:

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