Solar Energy

Q.

We are able to see objects due to the reflection of light. Which of the following examples shows the reflection of light?

1. Moon

2. Sun

3. Stars

4. None of these

Q.

Explain the transformation of energy changes taken place in a radio.

Q.

Which of the following are not considered as a source of light?

1. Tube light

2. Moon

3. Sun

4. Burning candle

Q.

Water is the ultimate source of energy.

1. True

2. False

Q. Fill in the blanks:​
Green plants convert _______ energy into chemical energy.​

Q.

Why is it not possible to make use of solar cells to meet all our energy needs? State at ‘least three reasons to support your answer.

Q. $1$ mean solar day = _____ $s$.

1. $43200$
2. $86636$
3. $21600$
4. $10800$

Q.

Try to have more solar gadgets at home. Give reason.

Q. Solar energy is:

1. Solar rays reflected by moon towards earth
2. Radiation of sun incident on Earth’s surface
3. Burning of coal to produce temperature comparable to sun’s
4. None of these

Q. Which of the following objects reflects the maximum amount of light falling on it?

1. Mirror
2. Glass
3. Water
4. Butter paper

Q.

How do we see objects?

1. Light from our eyes leaves and illuminates the objects.

2. Every object is a light source and sends light to our eyes

3. All of these

4. Light from a light source is reflected by the object and when these fall on our eyes we see the object

Q. if the temperature of the sun is doubledthen the energy received by the earth will be how many times?

Q.

Solar energy can be obtained from:

1. Sun's rays on Earth’s surface

2. Solar rays reflected by Moon towards Earth

3. Burning of coal to produce temperature comparable to Sun’s

4. Energy from ocean tides due to Sun's gravitational pull