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With reference to Solar thermal energy, consider the following statements:
1. It provides more cost-effective electricity generation at small scales in comparisonto the photovoltaics.
2. High-temperature solar thermal energy systems are called concentrated solar power.
Which of the statements given above is/are correct?
Ans) B
Exp)
Statement 1 is incorrect. Solar energy comes from the sun and can be captured with various technologies, primarily solar panels. The “photovoltaic effect” is the mechanism The second way to use solar energy is to capture the heat from solar radiation directly and use that heat in a variety of ways. Solar thermal energy has a broader range of uses than a photovoltaic system, but using solar thermal energy for electricity generation at small scales is not as practical as using photovoltaics.
Statement 2 is incorrect. High-temperature solar thermal energy systems are used for generating electricity on a larger scale. This type of technology is often referred to as concentrated solar power. In a solar thermal electricity plant, mirrors focus the sun's rays on tubes containing a liquid that can hold heat energy well. This heated fluid can then be used to turn water into steam, which then can turn a turbine and generate electricity.
Ans) B
Exp)
Statement 1 is incorrect. Solar energy comes from the sun and can be captured with various technologies, primarily solar panels. The “photovoltaic effect” is the mechanism The second way to use solar energy is to capture the heat from solar radiation directly and use that heat in a variety of ways. Solar thermal energy has a broader range of uses than a photovoltaic system, but using solar thermal energy for electricity generation at small scales is not as practical as using photovoltaics.
Statement 2 is incorrect. High-temperature solar thermal energy systems are used for generating electricity on a larger scale. This type of technology is often referred to as concentrated solar power. In a solar thermal electricity plant, mirrors focus the sun's rays on tubes containing a liquid that can hold heat energy well. This heated fluid can then be used to turn water into steam, which then can turn a turbine and generate electricity.
Which of the following is/are cloud computing platforms?
1. Google Docs
2. Netflix
3. Amazon EC2
Select the correct answer using the code given below:
Ans) D
Exp)
• A cloud computing system keeps its critical data on internet servers rather than distributing copies of data files to individual client devices.
• Video-sharing cloud services like Netflix, for example, stream data across the internet to a player application on the viewing device rather than sending customers DVD or BluRay physical discs. Yahoo email or Gmail are simple examples of cloud computing.
• Amazon Elastic Compute Cloud (Amazon EC2) is a web service that provides secure, resizable compute capacity in the cloud. It is designed to make web-scale cloud computing easier for developers. Amazon EC2's simple web service interface allows you to obtain and configure capacity with minimal friction.
Ans) D
Exp)
• A cloud computing system keeps its critical data on internet servers rather than distributing copies of data files to individual client devices.
• Video-sharing cloud services like Netflix, for example, stream data across the internet to a player application on the viewing device rather than sending customers DVD or BluRay physical discs. Yahoo email or Gmail are simple examples of cloud computing.
• Amazon Elastic Compute Cloud (Amazon EC2) is a web service that provides secure, resizable compute capacity in the cloud. It is designed to make web-scale cloud computing easier for developers. Amazon EC2's simple web service interface allows you to obtain and configure capacity with minimal friction.
Which of the following are the examples of a chemical change?
1. Explosion of fireworks
2. Using a chemical battery
3. Rotting of bananas
Select the correct answer using the code given below:
Ans) D
Exp)
• Chemical Changes are also called Chemical Reactions. Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties. Thus, the composition of the substance changes. The explosion of fireworks is an example of chemical change.
Some other examples of Chemical Changes are:
1. Burning wood
2. Souring milk
3. Mixing acid and base.
4. Digesting food
5. Cooking an egg
6. Heating sugar to form caramel
7. Baking a cake
8. Rusting of iron
Ans) D
Exp)
• Chemical Changes are also called Chemical Reactions. Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties. Thus, the composition of the substance changes. The explosion of fireworks is an example of chemical change.
Some other examples of Chemical Changes are:
1. Burning wood
2. Souring milk
3. Mixing acid and base.
4. Digesting food
5. Cooking an egg
6. Heating sugar to form caramel
7. Baking a cake
8. Rusting of iron
What are the 'Xenobots', sometimes mentioned in the news?
Ans) B
Exp)
• Xenobots are the world's first living, self-healing robots created from frog stem cells.
• They have been named xenobots after the African clawed frog (Xenopuslaevis) from which they take their stem cells, the machines are less than a millimeter (0.04 inches) wide -- small enough to travel inside human bodies. They can walk and swim, survive for weeks without food, and work together in groups.
• Stem cells are unspecialized cells that have the ability to develop into different cell types.
• Xenobots don't look like traditional robots -- they have no shiny gears or robotic arms. Instead, they look more like a tiny blob of moving pink flesh. The researchers say this is deliberate - this "biological machine" can achieve things typical robots of steel and plastic cannot.
Ans) B
Exp)
• Xenobots are the world's first living, self-healing robots created from frog stem cells.
• They have been named xenobots after the African clawed frog (Xenopuslaevis) from which they take their stem cells, the machines are less than a millimeter (0.04 inches) wide -- small enough to travel inside human bodies. They can walk and swim, survive for weeks without food, and work together in groups.
• Stem cells are unspecialized cells that have the ability to develop into different cell types.
• Xenobots don't look like traditional robots -- they have no shiny gears or robotic arms. Instead, they look more like a tiny blob of moving pink flesh. The researchers say this is deliberate - this "biological machine" can achieve things typical robots of steel and plastic cannot.
Consider the following statements:
1. Radio frequency will deplete on use and be wasted if not used efficiently.
2. Radio waves travel much faster than that of the light in free space.
3. Microwaves are a type of radio wave with lower frequencies.
Which of the statements given above is/are correct?
Ans) A
Exp)
• Statements 1 is correct. Radio frequency is natural resource but unlike other natural resource, its major limitation is that it will deplete on use. It will be wasted if not used efficiently.
• Statement 2 is incorrect. Radio waves are electromagnetic waves and they travel at the speed of light in free space.
• The equation that joins frequency and length is the following: speed of light (c) = frequency x wavelength.
• In the equation you can see that, if the RF frequency increases, its wavelength decreases.
• Statement 3 is incorrect. Microwaves are a type of radio wave with higher frequencies. Radio frequencies are not visible to the human eye. Microwaves are a type of electromagnetic radiation, as are radio waves, ultraviolet radiation, X-rays and gamma-rays. Microwaves have a range of applications, including communications, radar and cooking.
Ans) A
Exp)
• Statements 1 is correct. Radio frequency is natural resource but unlike other natural resource, its major limitation is that it will deplete on use. It will be wasted if not used efficiently.
• Statement 2 is incorrect. Radio waves are electromagnetic waves and they travel at the speed of light in free space.
• The equation that joins frequency and length is the following: speed of light (c) = frequency x wavelength.
• In the equation you can see that, if the RF frequency increases, its wavelength decreases.
• Statement 3 is incorrect. Microwaves are a type of radio wave with higher frequencies. Radio frequencies are not visible to the human eye. Microwaves are a type of electromagnetic radiation, as are radio waves, ultraviolet radiation, X-rays and gamma-rays. Microwaves have a range of applications, including communications, radar and cooking.