Question Discussion & Solution

The correct answer is 8 minutes.

• It takes 8 minutes to reach the earth.

Key Points

• Light is a form of energy which is propagated as electromagnetic waves.
• In the spectrum of electromagnetic waves, it lies between the ultra-violet and infra-red region and has a wavelength between 3900 Å to 7800 Å.
• light behaves as wave and particle both. 
• Speed of light is maximum in vacuum and air (3×10⁸ m/s).
• It is a transverse wave.
• It takes 8 min 19 s to reach on the earth from the sun.
• The light reflected from the moon takes 1.28 s  to reach earth.

Additional Information

• Electromagnetic waves are transverse, hence light is a transverse wave.
• Wave nature of light explains rectilinear propagation, reflection, refraction, interference, diffraction and polarization of light. 
• Refractive Index of a medium is defined as the ratio of the speed of light in a vacuum to the speed of light in the medium. 
• Light is measured with two main alternative sets of units: radiometry consists of measurements of light power at all wavelengths, while photometry measures light with a wavelength.

The correct answer is Red Light.

Concept:

Photosynthesis: 

• The leaves have a green pigment called chlorophyll.
• It helps leaves to capture the energy of the sunlight.
• This energy is used to synthesise (prepare) food from carbon dioxide and water. Since the synthesis of food occurs in the presence of sunlight, it is called photosynthesis.

In the presence of sunlight Carbon dioxide + water → Carbohydrate + oxygen.

• Some plants, green algae, and cyanobacteria can perform photosynthesis.
• The process of photosynthesis is commonly written as

                   6CO2 + 6H2O + Sun-Light → C6H12O6 + 6O2

Explanation:

• Photosynthesis is maximum in the Red colour of Light and Least in the Green colour of Light.
• In the absorption spectrum, the red & blue lights are absorbed while the majority of green light gets reflected
• Photosynthesis range from 400 to 700 nm, It absorbs the Violet, Blue and Red colour of Light.

The correct answer is Desktop.

Key Points

• The first thing you see when you open your computer is called the desktop.
  • From the top left of the screen to the bottom left, you'll see some small pictures called icons.

Additional Information

• My Documents -
  • This folder is a component of a user profile that is used as a unified place to store personal data.
  • By default, the My Documents folder is a folder in a user's profile that is used as the default storage location for saved documents.​
• My Computer -
  • My computer is a system folder.
  • With the help of this, we can see all the drives. And can work with them too.
• Downloads -
  • In computer networks, download refers to receiving data from a remote system.
  • Generally a server like as a web server, an FTP server, or another similar system.​

The correct answer is Kwashiorkor.

Key Points

• Kwashiorkor disease of caused by protein deficiency.
• Kwashiorkor, also known as “edematous malnutrition” because of its association with edema (fluid retention), is a nutritional disorder most often seen in regions experiencing famine.
• It is a form of malnutrition caused by a lack of protein in the diet. People who have kwashiorkor typically have an extremely emaciated appearance in all body parts except their ankles, feet, and belly, which swell with fluid.

Important Points

• Most people who are affected by kwashiorkor recover fully if they are treated early.
• Treatment involves introducing extra calories and protein into the diet. Children who develop kwashiorkor may not grow or develop properly and may remain stunted for the rest of their lives.
• There can be serious complications when treatment is delayed, including coma, shock, and permanent mental and physical disabilities. Kwashiorkor can be life-threatening if it’s left untreated.
• It can cause major organ failure and eventually death.

Additional Information

Just as Needle is a part/component of the Clock, similarly Blade is a part/component of Fan.

Thus the related word pair is Fan : Blade.