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Subject: Science and Technology

  • Consider the following activities

    Consider the following activities:
    (1) Spraying pesticides on a crop field
    (2) Inspecting the craters of active volcanoes
    (3) Collecting breath samples from spouting whales for DNA analysis
    At the present level of technology, which of the above activities can be successfully carried out by using drones?

  • Consider the following statements

    Consider the following statements:
    (1) Genetic changes can be introduced in the cells that produce eggs or sperms of a prospective parent.
    (2) A person’s genome can be edited before birth at the early embryonic stage.
    (3) Human induced pluripotent stem cells can be injected into the embryo of a pig.
    Which of the statements given above is/are correct?

  • Consider the following

    Consider the following:
    1. Bacteria
    2. Fungi
    3. Virus
    Which of the above can be cultured in artificial/synthetic medium?

  • Consider the following statements

    Consider the following statements:

    1.Adenoviruses have single-stranded DNA genomes, whereas retroviruses have double-stranded DNA genomes.
    2.The common cold is sometimes caused by an adenovirus, whereas AIDS is caused by a retrovirus.
    Which of the statements given above is/are correct?

  • Consider the following statements

    Consider the following statements :
    1. Other than those made by humans, nanoparticles do not exist in nature.
    2. Nanoparticles of some metallic oxides are used in the manufacture of some cosmetics.
    3. Nanoparticles of some commercial products which enter the environment are unsafe for humans.
    Which of the statements given above is/are correct ?

  • Consider the following statements

    Consider the following statements :
    DNA Barcoding can be a tool to :
    1. assess the age of a plant or animal.
    2. distinguish among species that look alike.
    3. identify undesirable animal or plant materials in processed foods.
    Which of the statements given above is/are correct ?

  • Consider the following statements

    Consider the following statements :
    1. Biofilms can form on medical implants within human tissues.
    2. Biofilms can form on food and food processing surfaces.
    3. Biofilms can exhibit antibiotic resistance.
    Which of the statements given above are correct?

  • Consider the following statements

    Consider the following statements:
    1. Ballistic missiles are jet-propelled at subsonic speeds throughout their fights, while cruise missiles are rocket-powered only in the initial phase of flight.
    2. Agni-V is a medium-range supersonic cruise missile, while BrahMos is a solid-fuelled intercontinental ballistic missile.
    Which of the statements given above is/are correct?

  • Consider the following statements

    Consider the following statements:
    1. Carbon fibres are used in the manufacture of the components used in automobiles and aircrafts.
    2. Carbon fibres once used cannot be recycled.
    Which of the statements given above is/are correct?

  • Consider the following pairs

    Consider the following pairs:
    Objects in space Description
    1. Cepheids : Giant clouds of dust and gas in sapce
    2. Nebulae : Stars which brighten and dim periodically
    3. Pulsars : Neutron stars that are formed when massive stars run out of fuel and collapse
    How many of the above pairs are correctly matched?