Characteristics of ideal fuel: It should be readily available. It should be economical. It should burn easily in air at a moderate rate. It should produce a large amount of heat. It should have high calorific value. It should not leave behind any undesirable substances on combustion. The fuel shouldRead more
Characteristics of ideal fuel:
It should be readily available.
It should be economical.
It should burn easily in air at a moderate rate.
It should produce a large amount of heat.
It should have high calorific value.
It should not leave behind any undesirable substances on combustion.
Good source of energy should have the following characteristics: It should do a large amount of work per unit mass or volume – it means that the output energy must be more than the input energy. It should have high calorific value. It should be easily accessible – the energy source should be able toRead more
Good source of energy should have the following characteristics:
It should do a large amount of work per unit mass or volume – it means that the output energy must be more than the input energy. It should have high calorific value.
It should be easily accessible – the energy source should be able to provide energy over a long period of time. Example: coal and petroleum.
Should be easy to store and transport – most common sources of energy such as coal, petrol, and LPG need to be transported to users from their points of production. They also need proper storage. Thus, it is important to store and transport these sources safely and economically.
Should be safe and convenient to use – energy sources should be safe as it is used by a large number of people and should be convenient. Example: Nuclear energy from a nuclear power plant is hazardous to be used at homes.
A student has difficulty in reading the blackboard while sitting in the last row. It shows that he is unable to see distant objects clearly. He is suffering from myopia. This defect can be corrected by using a concave lens.
A student has difficulty in reading the blackboard while sitting in the last row. It shows that he is unable to see distant objects clearly. He is suffering from myopia. This defect can be corrected by using a concave lens.
The near point of the adult human eye is 25 cm from which the object can be seen clearly without any strain over the eyes. Whereas the far point of the eye is infinity.
The near point of the adult human eye is 25cm from which the object can be seen clearly without any strain over the eyes.
What is a good fuel?
Characteristics of ideal fuel: It should be readily available. It should be economical. It should burn easily in air at a moderate rate. It should produce a large amount of heat. It should have high calorific value. It should not leave behind any undesirable substances on combustion. The fuel shouldRead more
Characteristics of ideal fuel:
- The fuel should have proper ignition temperature.
See lessWhat is a good source of energy?
Good source of energy should have the following characteristics: It should do a large amount of work per unit mass or volume – it means that the output energy must be more than the input energy. It should have high calorific value. It should be easily accessible – the energy source should be able toRead more
Good source of energy should have the following characteristics:
- It should be eco-friendly.
See lessA student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?
A student has difficulty in reading the blackboard while sitting in the last row. It shows that he is unable to see distant objects clearly. He is suffering from myopia. This defect can be corrected by using a concave lens.
A student has difficulty in reading the blackboard while sitting in the last row. It shows that he is unable to see distant objects clearly. He is suffering from myopia. This defect can be corrected by using a concave lens.
See lessWhat is the far point and near point of the human eye with normal vision?
The near point of the adult human eye is 25 cm from which the object can be seen clearly without any strain over the eyes. Whereas the far point of the eye is infinity.
The near point of the adult human eye is 25 cm from which the object can be seen clearly without any strain over the eyes.
Whereas the far point of the eye is infinity.
See lessA person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?
A person with a myopic eye can use concave lens to restore proper vision.
A person with a myopic eye can use concave lens to restore proper vision.
See less