ANS:D - Neither I nor II is implicit

Explanation: The statement implies that it was not 'literally' imprisonment, but Nelson Mandela's dedicated service to the nation and his struggle for freedom despite various hardships that won him the desired public appeal to be elected the President. So, neither I nor II is implicit.

ANS:A - force x distance

Work = Force x Distance.

If I carry an object to and fro 10 metres, the work done would be Force x 20 metres.

Work = Force x Displacement.

If I carry an object to and fro 10 metres, the work done would be Force x 0 metres.
A is the right option.

ANS:B - balun

No answer description is available.

ANS:D - Partition hard disk

No answer description is available.

ANS:B - ball mill

Coal is finally pulverized to 200 mesh size for burning in boilers by a ball mill.

Explanation:

• Pulverization of Coal:
  • Coal is pulverized to achieve a fine powder size suitable for combustion in boilers. This process ensures efficient burning and maximum energy extraction from coal.
• Method Used:
  • Ball Mill: A ball mill is commonly used for pulverizing coal to achieve the desired particle size. In a ball mill, coal is introduced at one end and is pulverized as it passes through the mill, where grinding media (steel balls or rods) are used to crush the coal into a fine powder.
• Other Options:
  • Hammer Crusher: Typically used for crushing coal into smaller sizes initially but not for achieving the fine powder size required for combustion.
  • Roll Crusher: Used for secondary or tertiary crushing of coal, producing larger chunks than required for pulverization to 200 mesh size.
  • Gyratory Crusher: Used for primary crushing of large lumps of coal but not suitable for achieving the fine pulverized size needed for burning in boilers.
• Mesh Size: Pulverizing coal to 200 mesh size ensures that the coal particles are small enough to be efficiently burned in boilers, providing optimal heat release and combustion efficiency.

ANS:D - India

India won the gold medal in the men's hockey event at the 2023 Asian Games, defeating Japan in the final. This was India's third gold medal in men's hockey at the Asian Games.

ANS:A - 22

Indians can enjoy visa-free travel to 22 countries, according to Arton Capital Passport Index.

ANS:D - Azerbaijan

Azerbaijan agreed Saturday (17 December) to supply the European Union with electricity via a subsea cable, inking a deal in Bucharest as the bloc diversifies energy supply away from Russia following Moscow's invasion of Ukraine.

ANS:A - Egypt

IMF approved a deal with Egypt for USD 3 billion support package to support its economy.