Sources of Energy Test

Result

Sources of Energy Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

Find the incorrect statement about solar cooker

A
It saves fuel

B
It take short time for cooking.

C
the nutrients of food do not get destroyed

D
the direction of reflector of solar cooker has to be adjusted frequency

Solution

The angles are adjusted below such that the angles that the sun's rays reflect off the reflectors are the same as the angles that the sun's rays arrived at the reflectors.
Question 2
1 / -0

Which of the following is not present in Hydrogen Bomb.

A
Li⁶

B
Tritium

C
14C

D
Deuterium

Solution

hydrogen bomb or H-bomb, weapon deriving a large portion of its energy from the nuclear fusion of hydrogen isotopes. In an atomic bomb, uranium or plutonium is split into lighter elements that together weigh less than the original atoms, the remainder of the mass appearing as energy.
Question 3
1 / -0

Why do we use black surfaces in solar devices?

A
because the blackened surface gives less warmth than white

B
because black surfaces absorb more heat than unblackened surfaces.

C
because temperature in the water of blackened surface was found to rise slowly and hence cooks food easily

D
because water in contact with black surface acquires less heat

Solution

Black surfaces absorb more radiation, i.e. more photons are converted to heat than lighter colors where the photons bounce off or are re-emitted.

The trick for storage is to use a paint that is "black" in the visible spectrum where most of the incident energy is, but "white" in the infrared spectrum so energy doesn't get re-emitted when the panels heat up.
Question 4
1 / -0

Lights from two different sources A and B have wavelength 0.3 micron and 0.7 micron respectively. Which one of the two light carry more energy per photon?

A
light sources A

B
Light source B

C
Both the lights have same energy

D
None of these

Solution

Waves with a short wavelength have the most energy.. Here light source A has less wavelength. Red waves have a relatively long wavelength (in the 700 nm range), and violet waves are much shorter - roughly half that. Because violet waves have the shortest wavelength of the visible light spectrum, they carry the most energy.
Question 5
1 / -0

Statement A : obtaining energy from nuclear fusion reaction is preferable to obtaining of energy from nuclear fission reactions. , Statement B : Electricity generated by the water stored in a dam can be considered to be another form of solar energy.

A
Statement A is true, Statement B is false

B
Statement B is true, Statement A is false

C
Both the statement A and B are true

D
Both the Statement A and B are false

Solution

Nuclear fusion creates more destruction than fission so statement A is false and solar energy helps in water cycle so statement B is true.
Question 6
1 / -0

Which energy is not derived from the sun?

A
Biomass energy

B
wind energy

C
Ocean wave energy

D
Nuclear energy

Solution

The energy released during nuclear fission or fusion, especially when used to generate electricity. This does not include any action of solar energy.
Question 7
1 / -0

A solar panel is made by combining a large member of-

A
Solar water heaters

B
Solar cells

C
Solar concentrators

D
Solar cookers

Solution

A solar panel, or module, is a series of interconnected silicon cells(solar cells) joined together to form a circuit. In greater numbers the amount of power produced by these interconnected cells can be increased and used as an electricity production system.Solar panels come in different sizes for different purposes.
Question 8
1 / -0

The site of hydroelectric plant should be chosen carefully because it-

A
Produces a large amount of CO and CO₂

B
Is expensive.

C
Affects the organisms of the region

D
Produces a large amount of electricity

Solution

For construction of hydro power plant first we choose the area where the water is sufficient to reserve and no crisis of water and suitable to build a dam, and it should be carefully constructed as water is home of many organisms. So care should be taken that those organisms do not get affected.

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Re-Attempt Weekly Quiz Competition

Sources of Energy Test - 9

Result

Sources of Energy Test - 9

Score

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SHARING IS CARING

Question 1

It saves fuel

It take short time for cooking.

the nutrients of food do not get destroyed

the direction of reflector of solar cooker has to be adjusted frequency

Solution

Question 2

Li6

Tritium

14C

Deuterium

Solution

Question 3

because the blackened surface gives less warmth than white

because black surfaces absorb more heat than unblackened surfaces.

because temperature in the water of blackened surface was found to rise slowly and hence cooks food easily

because water in contact with black surface acquires less heat

Solution

Question 4

light sources A

Light source B

Both the lights have same energy

None of these

Solution

Question 5

Statement A is true, Statement B is false

Statement B is true, Statement A is false

Both the statement A and B are true

Both the Statement A and B are false

Solution

Question 6

Biomass energy

wind energy

Ocean wave energy

Nuclear energy

Solution

Question 7

Solar water heaters

Solar cells

Solar concentrators

Solar cookers

Solution

Question 8

Produces a large amount of CO and CO2

Is expensive.

Affects the organisms of the region

Produces a large amount of electricity

Solution

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Li⁶

Produces a large amount of CO and CO₂