STD VII SCIENCE ONLINE SELF NECTA TEST FOR YEAR 2006

SCIENCE 2006

SECTION A

Choose the correct answer and then write the appropriate letter in the front of each question in your answer sheet.

1. Which of the following represents a physical change?

  1. Water to be steam
  2. Burning paper
  3. Honey turns into alcohol
  4. Iron to get rusty 
  5. Wood to be charcoal
Choose Answer


2. One of the listed below helps to preserve the environment and is:

  1. cutting down trees for firewood and building;
  2. crop rotation;
  3. using chemical fertilizer; 
  4. clearing fields by tilling;
  5. Grazing cattle in large numbers.
Choose Answer


3. What is the hardest mineral?

  1. Diamonds
  2. Coal 
  3. Copper 
  4. Mica 
  5. Gold
Choose Answer


4. Meat, fish, milk and eggs are foods of:

  1. Energy giving
  2. to defend the body 
  3. body building 
  4. warming the body 
  5. perishable and hard to preserve
Choose Answer


5. Plants absorb water and mineral salts in the form represented by the letter L in the following diagram. What is that method?

  1. water and mineral flow
  2. translocation
  3. phototropism
  4. Osmosis
  5. photosynthesis
Choose Answer


6. Wheel axle is a machine.........

  1. complex used to lift things up
  2. solid held by a small wheel
  3. with interlocking teeth of another wheel
  4. easy to use to lift things up 
  5. Which is used to lift heavy objects?
Choose Answer


7. Which number in the diagram below represents a hormone-releasing gland that prevents a person from getting diabetes?

https://myfiles.space/user_files/30996_4958b541bbe404eb/30996_custom_files/img1626675179.png

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
Choose Answer


8. The ship floats in the water (sea or lake) because it contains:

  1. a large hollow space inside
  2. a little airy space
  3. lighter than water
  4. waterproof plaster line
  5. it is less dense than water
Choose Answer


9. This experiment (carefully examine the following diagram) reveals that light 

  1. travels and divides objects into two parts
  2. travels in a straight line
  3. travels and bends as you go through different media
  4. it travels in the water by bending
  5. travels and causes things to bend
Choose Answer


10. The bicycle chain passes through two gears (see diagram below). The gear that moves the hind tires has 20 teeth and the one attached to the pedal has 50 teeth. If the pedals make two rotations, the hind tire will rotate .........times

  1. Five 
  2. Four 
  3. Three
  4. one
  5. Many
Choose Answer


11. The parts that make up the circulatory system are the blood itself,

  1. brain and blood vessels 
  2. lungs and blood vessels
  3. heart and blood vessels 
  4. heart and sensory nerves
  5. heart and brain
Choose Answer


12. The weight of the load x in the following diagram is:

  1. 200 kg
  2. 2.5 kg
  3. 25 kg
  4. 250 kg
  5. 36.5 kg
Choose Answer


13. The act of breaking down and changing food so that it can be absorbed in the body is known as

  1. digestion 
  2. fertilization
  3. absorption
  4. excretion
  5. respiration
Choose Answer


14. Observe the following diagram carefully. Whose particles are more loosely packed?

Choose Answer


15. Which of the following diseases is caused by vitamin deficiency?

  1. Tuberculosis 
  2. scurvy
  3. Chickenpox 
  4. Malaria
  5. Diarrhea
Choose Answer


16. Magnetism can be removed by doing the following:

  1. Hitting and heating while hanged east-westwards
  2. Hanging East-Westwards and washing it
  3. Coiling it and then allowing an electric current to pass through it
  4. Coiling it and then burning it
  5. Hitting it and then coiling it
Choose Answer


17. Fishing with dynamite fishing is one way to:

  1. promoting science
  2. ways of killing water hyacinth that litter the water
  3. destroying fish stocks and polluting the environment
  4. removing large fish species
  5. to chase away wild sharks from eating small fish
Choose Answer


18. The part shown with the letter Z in the following diagram is called

https://myfiles.space/user_files/30996_4958b541bbe404eb/30996_custom_files/img1626676185.png

  1. nucleus
  2. vacuole
  3. cytoplasm
  4. cell wall
  5. epithelium
Choose Answer


19. Which of the following diseases can be prevented by vaccination?

  1. Whooping cough
  2. Gonorrhea 
  3. Malaria 
  4. typhoid
  5. Cholera
Choose Answer


20. Which of the following acts promotes soil erosion?

  1. Raising a lot of livestock and cutting down trees
  2. terracing farming and grass spreading
  3. non-terracing and irrigation
  4. Raising a lot of livestock and planting trees 
  5. Planting trees and burning fields
Choose Answer


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