Question Discussion & Solution

The pattern followed here is:

25 → First digit of 23 and second digit of 65.

68 → First digit of 61 and second digit of 38.

? → First digit of 72 and second digit of 48 → 78.

Hence, the answer is 78.

The correct answer is Boy pushing wall in a room.

Key Points

• Boy pushing the wall in the room is not an example of work done.
  • When a boy pushes a wall, he is applying force on the wall. We see that the wall shows no displacement.
  • Work is given as the product of the forces and the displacement in the same direction.
  • Hence the work done is zero.

Additional Information

• Work is done when a force moves. Everyday examples of work include walking up a flight of stairs, lifting heavy objects, pulling a sled and pushing a shopping trolley, Applying pressure on a pebble lying on the surface, raising a book to a height.
  • Work is not done when holding a bag stationary or a book at arm's length because although a force is being applied, the force does not move.

The correct answer is Tartaric acid.

• Tartaric acid is an organic acid that is white and crystalline.

Key Points

• It is found naturally in many fruits like grapes, bananas, tamarind, etc.
• This acid is added to foods as an antioxidant and to give its distinctive sour taste.
• Crystals and powders are prepared by a chemical process.
• It is also added to food for preservation.
• It is also a good antioxidant and is beneficial for kidneys.
• It helps to absorb minerals in the body.
• It is also helpful in controlling problems related to gases in the body.

The correct answer is Suryamal Misran.

Key Points

• Veer Satsai, Balvadvilas and Ramranjat were written by Suryamal Misran.

Additional Information 

• Suryamal Mishra Ji was born in 1815 AD: Bundi, Rajasthan.
  • He was the famous court poet of Maharaja Ramsingh who was the chieftain of Rajasthan.
  • The most famous composition of Suryamal mixture is Vansha Bhaskar, which tells about the history of the Chauhan ruler of Bundi.
  • Many famous compositions have been written by him such as Veer Sathashi, Balwand Bilas.
  • He was rich in talent from his childhood.

The correct answer is China.

Key Points

• The Russia and China joint naval exercises “Joint Sea 2021” has kicked off at Russia’s Peter the Great Gulf, in the Sea of Japan, on October 14, 2021.
• The exercises will culminate on October 17, 2021.
• The drill is being carried out as part of ‘Joint Sea’ 2021, the series of bilateral naval exercises that have been taking place between the two services since 2012.

Additional Information

•  Important Exercises between India and other countries: