Science

10th

grade

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CBSE CHALLENGE QUIZ

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10 questions

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  • 1. Multiple Choice
    45 seconds
    1 pt

    Transpiration has been described as a ‘necessary evil’ because it is inevitable, but potentially harmful. Which of the following are the after-effects of transpiration?

    (i) Absorption of mineral salts.

    (ii) Regulation of plant temperature.

    (iii) Energy deficit and injury in plants.

    (iv) Ascent of sap.

    (i) & (iv)

    (i) & (iii)

    (i), (ii) & (iii)

    (i), (ii) & (iv)

  • 2. Multiple Choice
    45 seconds
    1 pt

    A simplified food chain for an aquatic environment is shown below: algae → mosquito larvae → small fish → large fish If the number of mosquito larvae suddenly increased, the food chain would be affected. Analyze the following consequences and select from the choices what would be the impact?\

    I. The number of small fish would increase.

    II. The number of large fish would decrease.

    III. The number of large fish would increase.

    IV. Amount of algae would decrease.

    Only I

    Only IV

    Both I and IV

    Both II and IV

  • 3. Multiple Choice
    2 minutes
    1 pt
    Image

    A roller coaster begins at rest from point A, 120 m above the ground, as shown in figure. Assume that no energy is lost from the coaster to frictional heating, air resistance, sound, or any other process. The radius of the loop is 40 m. (take g=10 m/s2 ). The speed of the roller coaster at points B and D are respectively

    34 m/s, 28 m/s

    28 m/s, 34 m/s

    17 m/s, 14 m/s

    17 m/s, 0

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