Prabin Kalikote

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Asked Questions

What is the electric power consumption? Define 1 KWhr.

The rate at which electrical work is done or the rateat which electrical energy is consumed calledelectric power consumption.

1 KWhr can be defined as the amount of electricalenergy consumed byan electrical appliance having apower ratio of 1KW for 1 hrs.

Define AC and DC. What does it mean when we say that the frequency of the current distribution in Nepal is 50 Hz.

The current which changes its magnitude and polarityis called AC.

The current that has fixed magnitude and polarityis called DC.

The frequency of current distributed in Nepal is 50 Hzmeans the polarity of the current changes 50 timesin a second.

What is a heating element?

The wire which produces heat by passing acurrent through it is called the heating element.

Write any 5 points to be remembered during household wiring.

Any 5 points to be remembered during household wiring are:

Switch and fuse should be connected to a live wire.
The fuse should be of the proper rating.
Wing should be done in a dry and safe place.
The connection of plugs switches, etc should be strong.
Use of electric appliances and wires of high quality.

What is current electricity? Define closed and open circuits with the neat figures of each.

The flow of electrons in a definite direction iscalled current electricity.

i. Open electric circuit:
An electric circuit in whichno current is flowing is called an open circuit.

ii. Closed electric circuit:
An electro circuit in whichelectric current is flowing continuously is called aclosed electric circuit.

Differentiate between.Convex and concave lensVirtual images and real imagesMyopia and hypermetropiaFar point and near point

a. Convex and concave lens.

Convex	Concave
It is thick in the middle and thin at the edges.	It is thin in the middle and thick at the edges.
It converges the parallel beam of light.	It diverges the parallel beam of light.
It has a real focus.	It has a virtual focus.
It has +ve power.	It has -ve power.

b. Virtual image and real image.

Virtual	Real
It cannot be cast on the screen.	I can be cast on the screen.
It is always erect.	It is always inverted.
It is formed by the...

A concave lens is used to remove myopia. Why?

As we know, myopia is the defect of vision in which a person can see nearby objects but cannot see distant objects. While using a concave lens, the rays of the light coming from a nearby object are first diverged by the concave lens and by the eye lens. Due to the combined diverging action of both lenses, the image is formed at the retina. So, a concave lens is used in spectacles to remove myopia.