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A newly planted sapling usually grows an...

A newly planted sapling usually grows and matures into a tree in more than :

A

50 years

B

25 years

C

45 years

D

15 years

Text Solution

Verified by Experts

The correct Answer is:
D
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LAKHMIR SINGH & MANJIT KAUR-SOURCES OF ENERGY -Exercise
  1. What is a good fuel ?

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  2. The fuel having a calorific value of 55 kJ/g is likely to be :

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  3. A newly planted sapling usually grows and matures into a tree in more ...

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  4. Which of the following fuels has the highest calorific value ?

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  5. The fuel having the lowest calorific value is :

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  6. There are four fuels which all contain only carbon and hydrogen. The f...

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  7. One of the following is not a characteristic of a good fuel. This is :

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  8. Which of the following is not a fossil fuel ?

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  9. Most of the fuels contain carbon as one of the constituents. Name a fu...

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  10. A hydro-power plant converts one form of energy into another. Name the...

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  11. What type of energy is possessed by flowing water ?

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  12. Flowing water can rotate a turbine. Which type of energy is used up by...

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  13. Name the original source of wind energy.

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  14. What should be the minimum wind speed for the satisfactory working of ...

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  15. Name some of the solar energy devices.

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  16. Name the device which converts sunlight into electricity.

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  17. Fill in the following blanks with suitable words : A solar cell co...

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  18. (a) What is the difference between a thermal power plant and a hydro p...

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  19. Compare and contrast fossil fuels and the sun as sources of energy.

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  20. What kind of mirror-concave, convex or plane-would be best suited for ...

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