CBSE & Upb Class-8th Science Crop Production,Micro Organisms & Synthetic Fibres

20 Questions | Total Attempts: 20

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CBSE & Upb Class-8th Science Crop Production,Micro Organisms & Synthetic Fibres

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Questions and Answers
  • 1. 
    Name the crops which are grown in rainy season:
    • A. 

      Crops

    • B. 

      Rabi crops

    • C. 

      Kharif Crops

    • D. 

      None of these

  • 2. 
    Now a day's seed is sown using in the field using:
    • A. 

      Seed Tracter

    • B. 

      Seed drill

    • C. 

      Seed tiller

    • D. 

      Seed Plougher

  • 3. 
    A common acid used in jams & pickels is
    • A. 

      Sodium bezoate

    • B. 

      Nitric acid

    • C. 

      Sodium Chloride

    • D. 

      Copper Sulphate

  • 4. 
    Lactobacillus is commonly found in :
    • A. 

      Cake

    • B. 

      Curd

    • C. 

      Bread

    • D. 

      All of the above

  • 5. 
    The pores in the bread is due to gas bubbles of:
    • A. 

      Oxygen

    • B. 

      Nitrogen di oxide

    • C. 

      Nitrogen

    • D. 

      Carbon di oxide

  • 6. 
    Polythene & PVC are examples of:
    • A. 

      Bio degradable substance

    • B. 

      Thermosetting plastics

    • C. 

      Thermoplastic

    • D. 

      Rayon

  • 7. 
    ________ is an example of natural fibre
    • A. 

      Rayon

    • B. 

      Cellulose

    • C. 

      Nylon

    • D. 

      All of the above

  • 8. 
    Bakelite & Malamine are examples of :
    • A. 

      Thermosetting plastics

    • B. 

      Silk

    • C. 

      Nylon

    • D. 

      Rayon

  • 9. 
    The coating on modern non stick cookware & iron is of:
    • A. 

      Terrycot

    • B. 

      Rayon 

    • C. 

      Polyester 

    • D. 

      Teflon

  • 10. 
    Examples of multicellular organisms are:
    • A. 

      Algae, Bacteria

    • B. 

      Bacteria, Fungi

    • C. 

      Bacteria, Viruses

    • D. 

      Algae, Fungi

  • 11. 
    Which of the following is a disease caused by protozoans?
    • A. 

      Tuberculosis

    • B. 

      Malaria

    • C. 

      Typhoid 

    • D. 

      Polio

  • 12. 
    Which of the following diseases is caused by a bacteria?
    • A. 

      Chicken Pox

    • B. 

      Tuberculosis

    • C. 

      Dengue 

    • D. 

      Polio

  • 13. 
    Partial sterilization of a product such as milk at a high temperature is known as:  
    • A. 

      Pasteurization

    • B. 

      Filtration 

    • C. 

      Pickling

    • D. 

      Refrigeration

  • 14. 
    Vaccines are made up of:
    • A. 

      Chemicals

    • B. 

      Weak microorganisms

    • C. 

      Viruses

    • D. 

      Drugs

  • 15. 
    Which one of the following is not a method of food preservation?
    • A. 

      Salting

    • B. 

      Drying

    • C. 

      Boiling

    • D. 

      Pickling

  • 16. 
    Which of the following is used to preserve food grains at home?
    • A. 

      Spinach leaves

    • B. 

      Curry leaves

    • C. 

      Neem leaves

    • D. 

      Tulsi leaves

  • 17. 
    Which type of irrigation is similar to rainfall?
    • A. 

      Moat

    • B. 

      Sprinkler System

    • C. 

      Rahat

    • D. 

      Drip System

  • 18. 
    Which of the following material is a mixture of two fibres?
    • A. 

      Jute

    • B. 

      Polywool

    • C. 

      Polyester

    • D. 

      Nylon

  • 19. 
    Identify the Synthetic fibres which resemble wool:
    • A. 

      Rayon

    • B. 

      Terylene

    • C. 

      Teflon

    • D. 

      Acrylic

  • 20. 
    Firefighters’ uniform is coated with a plastic that is fire resistant. Identify the plastic from the given options.
    • A. 

      Teflon

    • B. 

      Malamine

    • C. 

      PET

    • D. 

      Polyester

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