Solar Photovoltaic Cell

Q.

Why do you think that solar energy has a bright future in India?

Q.

Give some examples of secondary cells.

Q.

Give some examples of primary cells.

Q.

Why refrigerator is always painted white from inside???

Q.

What is a solar panel?

Q.

The efficiency of the modern solar cells from selenium is up to

1. $25\%$

2. $40\%$

3. $65\%$

4. $80\%$

Q.

Photovoltaic cell converts chemical energy into electrical energy.

1. True
2. False

Q.

The cell represented in the figure is

1. Daniel Cell

2. Fuel Cell

3. Galvanic Cell

4. Leclanche Cell

Q. Which of the following statements is / are correct ?

1. A solar panel is made by combining a large number of solar concentrators.
2. To work properly, wind energy generators need wind speeds of at least about 15 km/h.
3. Many of the sources ultimately derive their energy
4. none

Q. Make a list of conventional and non-conventional sources of energy. Give a brief description of harnessing one non-conventional source of energy.

Q. Why do solar cells have a great future?

1. They provide a clean source of energy.
2. All of the above.
3. The cost of conventional sources of energy is rising while cost of solar cells is reducing.
4. Supply of energy from sun is unlimited.

Q. State the laws of reflection _________________.

Q.

A light ray is incident on a plane mirror at an angle of $60°$. Calculate the angle of reflection.

Q.

A solar panel containing $1500$ solar cells each of surface area $5c{m}^2$arranged in a parallel combination, is used to supply electrical energy for domestic needs. The efficiency of a solar cell is $35\%$ and $600J$ of energy is incident on one square meter area in second, find the electrical energy generated in one hour.

Q.

In which of the following devices semiconductors are used?

1. Radio

2. Television

3. Digital meter

4. Solar panel

Q. The efficiency of a solar cell is 20% and its surface area is $4{cm}^2$. Find the electrical energy generated in one second, by 3000 cells, connected in a solar panel, if $640J$ of solar energy is incident on one meter square area, in one second.

1. 183.6 J
2. 153.6 J
3. 193.6 J
4. 123.6 J

Q. State any two uses of photovoltaic cell.

Q. Which type of electric current flow is produced by solar cells?

1. 
   Induced current
2. 
   Alternating current
3. 
   Static current
4. 
   Direct current

Q. What is the principle of working of solar cell

1. photovoltaic effect
2. green house effect
3. Faraday's law
4. Archimedes' principle

Q. A device when directly converts electric energy into solar energy is called solar cell.

1. True
2. False
3. Ambiguous
4. Data insufficient

Q.

Can the scientists use magnified UV rays of sun which can produce lot heat energy that can used in nuclear fusion

Q.

Which of the following are the sources of direct current?

1. DC generator

2. Batteries

3. Solar cells

4. None of the above

Q. Solar cell converts what type of energy into electricity?

1. Heat
2. Light
3. Both Heat and Light
4. Sound

Q. List any four areas where solar cells are being used as source of energy.

Q. In a solar cooler following arrangements are made. Write one function of each arrangement.
(i) The box is made of insulating material such as plastic or wood
(ii) A plane mirror is hinged at an angle at the top of the box.

Q. What is a solar cell ? Draw the labelled diagram of a solar cell.
(b) Name the semi-conductor material which is usually used for making solar cells.
(c) Write the uses of solar cells.

Q. The use of solar energy on large scale becomes harder because:

1. Its installation cost is often more than conventional systems.
2. Storing of large amounts of D.C. is not easy.
3. All of the above.
4. It requires a huge area of exposure to sunlight to gather substantial energy.

Q. The solar device used in traffic signal light, works on which of the following principle?

1. Conservation of momentum
2. Doppler effect
3. Photovoltaic effect
4. Electromagnetic induction

Q.

State the two laws of reflection?

Q. What is the difference between Voltaic cell and Danielle cell?