Question Discussion & Solution

The correct answer is In 1829.

• In order to prevent the practice of Sati, in 1829 it was first banned under the "Bengal Sati Regulation".

Key Points

• The Bengal Sati Regulation
  • ​The Bengal Sati Regulation was passed on December 4, 1829, here is all you should definitely know about the practice of Sati.
  • The Bengal Sati Regulation which banned the Sati practice in all jurisdictions of British India was passed on December 4, 1829, by the then Governor-General Lord William Bentinck.

Additional Information

• About Sati practice
  • Sati was a historical Hindu practice, in which a widow sacrifices herself by sitting atop her deceased husband's funeral pyre.
  • The extent to which sati was practised in history is not known with clarity.
  • However, during the early modern Mughal period, it was notably associated with the elite Hindu Rajput clan.

The correct answer is Dot Matrix.

Important Points

• Impact printer
  • Impact printer refers to a class of printers that work by banging a head or needle against an ink ribbon to make a mark on the paper.
  • The three most common forms of impact printers are:
    • Dot-matrix.
    • Daisy-wheel.
    • Line printers.

Key Points

• Dot-matrix Printers 
  • The technology behind dot-matrix printing is in such a way that the paper is pressed against a drum (a rubber-coated cylinder).
  • The electromagnetically-driven printhead moves across the paper and strikes the printer ribbon situated between the paper and printhead pin.
  • The impact of the printhead against the printer ribbon imprints ink dots on the paper which create human-readable characters.

Additional Information

• Laser Printer
  • ​A laser printer is a printer that uses a focused beam of light to transfer text and images onto paper. 
• Inkjet printer
  • ​Inkjet printers, as the name implies, use ink to print text, graphics, and images onto various types of paper. 
  • Inkjet printers, cartridges, and supplies are more widely available therefore cheaper than their thermal printer.
• Thermal printer​
  • Thermal printers use tiny heating elements to activate or transfer pigments.
  • Thermal printers are used most commonly to create labels, safety signs.

In this question shows that Lotus, Rose and Lily are kind of flower. So Marigold is also kind of flower but apple is the fruit, Red is color and flower is flower.

So most closely word is Marigold.

Hence, option 2 is the correct answer.

The correct answer is Total Internal Reflection of Light.

Key Points

• Total Internal Reflection of Light
  • When a light ray, traveling from a denser medium towards a rarer medium is incident at the interface at an angle of incidence greater than the critical angle, then the rays are reflected back into the denser medium.
  • Practical Applications of Total Internal Reflection
  1. The working of optical fiber is based on total internal reflection.
  2. Mirage is formed due to total internal reflection.
  3. The brilliance of diamonds is mainly due to the total internal reflection of light inside them.

Additional Information

• Reflection of Light
  • The phenomenon of rebounding back of light rays in the same medium on striking a smooth surface is called reflection of light.
  • Silver metal is one of the best reflectors of light.
• Diffraction of Light
  • The phenomenon of bending of light around the corners and the spreading of light within the geometrical shadow of the opaque obstacles is called diffraction of light.
• Refraction of Light
  • Change in the path of a light ray as it passes from one medium to another is called refraction.

The correct answer is Ammeter.

Key Points

• Ammeter
  • An ammeter is an instrument that is used to measure the current in the circuit.
  • It measures either direct or alternating electric current, in amperes (A).
  • It has a set of coils with very low resistance and inductive reactance.
  • This allows for very low impedance, the force that opposes electric current.

Additional Information

• Wattmeter
  • The wattmeter is an instrument for measuring the electric active power in watts of any given circuit.
  • Electromagnetic wattmeters are used for the measurement of utility frequency and audio frequency power; other types are required for radio frequency measurements.
• Hygrometer
  • Hygrometer instrument used in meteorological science to measure the humidity or amount of water vapour in the air.
• Pyrometer
  • A pyrometer is a type of remote-sensing thermometer used to measure the temperature of distant objects