All questions of How Organisms Obtain Energy for Grade 9 Exam
Among the following colours, which is the highest absorbent of heat radiations ?- a)Blue
- b)White
- c)Red
- d)Black
Correct answer is option 'D'. Can you explain this answer?
Among the following colours, which is the highest absorbent of heat radiations ?
a)
Blue
b)
White
c)
Red
d)
Black
|
Harshitha Das answered |
Black is the ultimate heat absorber. It absorbs all light on the visual spectrum, creating a void of light. As a result of absorbing all light wavelengths, black is the hottest possible color.
Which of the following fuel is the least polluting?- a)Diesel
- b)CNG
- c)Hydrogen
- d)LPG
Correct answer is option 'C'. Can you explain this answer?
Which of the following fuel is the least polluting?
a)
Diesel
b)
CNG
c)
Hydrogen
d)
LPG
|
Vikas Kumar answered |
According to all other fuels hydorgen is less polluting because Hydrogen gas is considered as cleanest fuel. Unlike carbon based fuels, hydrogen produces no harmful by-products on combustion. Only energy and clean water are produced.
Which part of the solar cooker is responsible for green house effect ?- a)mirror
- b)glass plate
- c)Outer cover of the solar cooker
- d)Coating with black colour inside the box
Correct answer is option 'B'. Can you explain this answer?
Which part of the solar cooker is responsible for green house effect ?
a)
mirror
b)
glass plate
c)
Outer cover of the solar cooker
d)
Coating with black colour inside the box
|
Swara Chopra answered |
The trapping of heat in the environment due to the presence of greenhouse gases like CO2, methane, water vapour etc is the greenhouse effect. This raises the temperature of the earth.
In the solar cooker the same process occurs, the sun rays are reflected by the mirror are trapped in the solar cooker by the glass plate (green house effect) and is used to heat the food.
In the solar cooker the same process occurs, the sun rays are reflected by the mirror are trapped in the solar cooker by the glass plate (green house effect) and is used to heat the food.
Which non-conventional source of energy uses the energy mass equation () to generate electricity?- a)Solar cells
- b)Nuclear energy
- c)Tidal energy
- d)Geothermal Energy
Correct answer is option 'B'. Can you explain this answer?
Which non-conventional source of energy uses the energy mass equation () to generate electricity?
a)
Solar cells
b)
Nuclear energy
c)
Tidal energy
d)
Geothermal Energy
|
Neha Patel answered |
Nuclear power is the use of nuclear reactions that release nuclear energy to generate heat, which most frequently is then used in steam turbines to produce electricity in a nuclear power plant. Nuclear power can be obtained from nuclear fission, nuclear decay and nuclear fusion. Presently, the vast majority of electricity from nuclear power is produced by nuclear fission of elements in the actinide series of the periodic table. Nuclear decay processes are used in niche applications such as radioisotope thermoelectric generators. The possibility of generating electricity from nuclear fusion is still at a research phase with no commercial applications. This article mostly deals with nuclear fission power for electricity generation.
The material used for making solar cells is- a)Silicon
- b)Copper
- c)Silver
- d)Gold
Correct answer is option 'A'. Can you explain this answer?
The material used for making solar cells is
a)
Silicon
b)
Copper
c)
Silver
d)
Gold
|
Moumita Joshi answered |
"Solar cells are being made of different types of semiconductor materials. Main types of materials from which solar cells are being made are listed as below,
Silicon based cells- Poly Silicon, Mono Silicon,
Thinfilm cells- amorphous Silicon, CdTe, CIGS, ZnS, CuZnTinS"
Thinfilm cells- amorphous Silicon, CdTe, CIGS, ZnS, CuZnTinS"
Nuclear energy is- a)Conventional source of energy
- b)Non-conventional source of energy
- c)Harmful form of energy
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
Nuclear energy is
a)
Conventional source of energy
b)
Non-conventional source of energy
c)
Harmful form of energy
d)
None of the above
|
Krishna Iyer answered |
Nuclear energy is one of the most environmentally friendly conventional sources of energy as it produces fewer greenhouse gas emissions during the production of electricity in comparison to sources like coal power plants.
The electric needs of an artificial satellite are fulfilled by using- a)solar cell panels
- b)chemicals
- c)nuclear energy
- d)wind energy
Correct answer is option 'A'. Can you explain this answer?
The electric needs of an artificial satellite are fulfilled by using
a)
solar cell panels
b)
chemicals
c)
nuclear energy
d)
wind energy
|
Star Star answered |
As the artificial satellites fly in space solar energy is easily available to them so solar panels are stuck to the satellite in the form of wings. so option A is the right answer.
Which radiations of sunlight are used in heating a solar cooker ?- a)ultra violet radiation
- b)infra red radiation
- c)visible light
- d)all of the above
Correct answer is option 'B'. Can you explain this answer?
Which radiations of sunlight are used in heating a solar cooker ?
a)
ultra violet radiation
b)
infra red radiation
c)
visible light
d)
all of the above
|
Rohit Basu answered |
Infrared radiations emitted by sunlight is used in heating up a solar cooker.
Which of the energies given below is not energy achieved from the sea- a)Wave energy
- b)Tidal energy
- c)Nuclear energy
- d)Thermal energy
Correct answer is option 'C'. Can you explain this answer?
Which of the energies given below is not energy achieved from the sea
a)
Wave energy
b)
Tidal energy
c)
Nuclear energy
d)
Thermal energy
|
Raghav Bansal answered |
Nuclear energy is achieved by fission or fusion of nuclei. All the remaining three energies are achieved from the sea.
Most of the energy we use originally comes from- a)soil
- b)sun
- c)oceans
- d)air
Correct answer is option 'B'. Can you explain this answer?
Most of the energy we use originally comes from
a)
soil
b)
sun
c)
oceans
d)
air
|
Khushi answered |
In addition to direct solar power from photovoltaic and solar thermal sources, coal, oil, natural gas, biomass, and even the wind and hydropower we harness to generate electricity originally derive their energy content from the effects of sunlight.
The temperature difference between deep and shallow water of ocean is exploited to obtain:- a)Sea-waves energy
- b)Ocean thermal energy
- c)Tidal energy
- d)Geothermal energy
Correct answer is option 'B'. Can you explain this answer?
The temperature difference between deep and shallow water of ocean is exploited to obtain:
a)
Sea-waves energy
b)
Ocean thermal energy
c)
Tidal energy
d)
Geothermal energy
|
Sagar Sengupta answered |
Ocean thermal energy conversion is a method used to create electricity that uses the temperature difference that exists between deep and shallow water, since the water is colder at greater depths.
The first controlled fission of an atom was carried out in Germany in:- a)1920
- b)1928
- c)1925
- d)1938
Correct answer is option 'D'. Can you explain this answer?
The first controlled fission of an atom was carried out in Germany in:
a)
1920
b)
1928
c)
1925
d)
1938
|
|
Harshitha Das answered |
The first controlled fission of an atom was carried out in Germany in 1938. Nuclear fission is the splitting of the nucleus of the atom.
The Sun has been radiating an enormous amount of energy at the present rate for nearly——- years and will continue radiating at that rate for about ——– years more.- a)10 billion, 10 billion
- b)5 billion, 5 billion
- c)2 billion, 5 billion
- d)5 billion, 10 billion
Correct answer is option 'B'. Can you explain this answer?
The Sun has been radiating an enormous amount of energy at the present rate for nearly——- years and will continue radiating at that rate for about ——– years more.
a)
10 billion, 10 billion
b)
5 billion, 5 billion
c)
2 billion, 5 billion
d)
5 billion, 10 billion
|
Shruti shukla answered |
Explanation:
The Sun has been radiating an enormous amount of energy at the present rate for nearly 5 billion years and will continue radiating at that rate for about 5 billion years more.
Key Points:
- The Sun is currently in the main sequence phase of its life cycle where it fuses hydrogen into helium in its core.
- It has been doing so for approximately 5 billion years, and it is estimated to continue doing so for another 5 billion years.
- This means the Sun is roughly halfway through its total lifespan of around 10 billion years.
Therefore, the correct answer is option B: 5 billion, 5 billion.
The Sun has been radiating an enormous amount of energy at the present rate for nearly 5 billion years and will continue radiating at that rate for about 5 billion years more.
Key Points:
- The Sun is currently in the main sequence phase of its life cycle where it fuses hydrogen into helium in its core.
- It has been doing so for approximately 5 billion years, and it is estimated to continue doing so for another 5 billion years.
- This means the Sun is roughly halfway through its total lifespan of around 10 billion years.
Therefore, the correct answer is option B: 5 billion, 5 billion.
Temperature difference required between the water at the surface and water at depths up to 2 km to operate ocean thermal conservation plants is- a)15oC to 20oC
- b)50oC
- c)20oC and more
- d)10 to 15oC
Correct answer is option 'C'. Can you explain this answer?
Temperature difference required between the water at the surface and water at depths up to 2 km to operate ocean thermal conservation plants is
a)
15oC to 20oC
b)
50oC
c)
20oC and more
d)
10 to 15oC
|
Srishti Mishra answered |
20oC is the minimum temperature difference required between 2 km of depth in ocean water to set up an ocean thermal power plant.
How much solar energy is received by India in one year ?- a)500 trillion kWh
- b)5000 trillion kWh
- c)50 trillion kWh
- d)5 trillion kWh
Correct answer is option 'B'. Can you explain this answer?
How much solar energy is received by India in one year ?
a)
500 trillion kWh
b)
5000 trillion kWh
c)
50 trillion kWh
d)
5 trillion kWh
|
Ayush Saha answered |
The amount of solar energy received by India is a whopping 5000 trillion KWH per year . But due to India's land usage pattern, the country's harness-able solar power potential has been estimated to be 750 GW.
The major problem in harnessing nuclear energy is how to- a)convert nuclear energy into electrical energy?
- b)split nuclei?
- c)dispose off spent fuel safely?
- d)sustain the reaction?
Correct answer is option 'C'. Can you explain this answer?
The major problem in harnessing nuclear energy is how to
a)
convert nuclear energy into electrical energy?
b)
split nuclei?
c)
dispose off spent fuel safely?
d)
sustain the reaction?
|
|
Srishti Mishra answered |
The major problem in harnessing nuclear energy is how to dispose off spent fuel safely as nuclear waste is the major problem in harnessing nuclear energy.
Estimated value of solar constant is:- a)1.4 kJ per second per square metre
- b)2.4 kJ per second per square metre
- c)3.4 kJ per second per square metre
- d)5.2 kJ per second per square metre
Correct answer is option 'A'. Can you explain this answer?
Estimated value of solar constant is:
a)
1.4 kJ per second per square metre
b)
2.4 kJ per second per square metre
c)
3.4 kJ per second per square metre
d)
5.2 kJ per second per square metre
|
|
Indira H answered |
Estimated value of Solar constant is 1.4kJ/s/m² mentioned in the Science NCERT textbook !!!!.
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