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Class 10 Class 12

List any four sources of energy which are selected for use for a given activity. 

1. Energy to run a cycle
2. Energy to run a car
3. Energy to cook food 
4. Energy to work on 


Four sources of energy used in the activity is:

1. Energy of muscles 
2. Chemical energy of petrol or diesel
3. Chemical energy of gas or kerosene
4. Electrical energy obtained from potential energy. Electrical appliances of water, chemical energy of fuels etc. 

1074 Views

What is a good source of energy?

In general a good source of energy would be one,

(i) which would do a large amount of work per unit mass or volume
(ii) which would be easily accessible.
(iii) which can be easily stored and transported.
(iv) which is also reasonably economical.

490 Views

Which of the following is not an example of a bio-mass energy source?

  • wood
  • gobar-gas
  • nuclear energy

  • coal


C.

nuclear energy

87 Views

What are the limitations of the energy that can be obtained from the oceans?

Energy from the oceans can be tapped in three different ways,

(i) Tidal energy.
(ii) Wave energy.
(iii) Ocean thermal energy.

(i) Tidal energy: Dams are constructed across the narrow openings in the sea and, the tidal energy can be harnessed using these methods. Such sites are limited and the electricity generated is not high enough to be commercially viable.

(ii) Wave energy:Kinetic energy of the air movement causes winf energy.
Such sites in the world are limited where the waves strike the shorelines with sufficient power.

(iii) Thermal energy: To convert ocean thermal energy into electricity, it is necessary that a difference of more than 20°C temperature between the surface waters and water at depths of 1000 metres is required. This process is not economical. 
120 Views

Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun’s energy?
  • geothermal energy
  • wind energy
  • nuclear energy
  • bio-mass.

A.

geothermal energy
104 Views

A solar water heater cannot be used to get hot water on

  • a sunny day

  • a cloudy day

  • a hot day

  • a windy day


B.

a cloudy day

110 Views