Question Discussion & Solution

The pattern followed here is:

Hence, '41' is the correct answer.

The correct answer is 1921.

• The Begun Kisan Andolan was started in 1921.

Key Points

• Begun Kisan Andolan:
  • It was one of the farmer's movements of Rajasthan during British Raj in India.
  • It was started in Menal village in 1921.
  • Begun is a village in Chittorgarh district.
  • Vijay Singh Pathik was the leader of this movement to Ramnarayan Chaudhary.
  • In 2023, an agreement was made between Rajasthan Sewa Sangh and Rawat Sawai Anup Singh Ji to settle the dispute but it was opposed by the government naming it a Bolshevik agreement and the government appointed a government employee in the place of Thikanedar under its Munsarmat policy. 
  • The leadership of this movement was later handed over to Vijay Singh Pathik. 

CONCEPT:

Equilibrium of a rigid body:

• A rigid body is said to be in mechanical equilibrium if both its linear momentum and angular momentum are not changing with time, or equivalently, the body has neither linear acceleration nor angular acceleration.
• Condition for the mechanical equilibrium:
  1. The total force, i.e. the vector sum of the forces, on the rigid body is zero.
  2. The total torque, i.e. the vector sum of the torques on the rigid body is zero.

⇒ \(\rm\vec{F_1}+\vec{F_2}+...+\vec{F_n}=0\)

⇒ \(\rm \vec{τ_1}+\vec{τ_2}+...+\vec{τ_n}=0\)

• If the forces on a rigid body are acting in the 3 dimensions, then six independent conditions to be satisfied for the mechanical equilibrium of a rigid body.
• If all the forces acting on the body are coplanar, then we need only three conditions to be satisfied for mechanical equilibrium.
• A body may be in partial equilibrium, i.e., it may be in translational equilibrium and not in rotational equilibrium, or it may be in rotational equilibrium and not in translational equilibrium.

EXPLANATION:

• A rigid body is said to be in mechanical equilibrium if both its linear momentum and angular momentum are not changing with time, or equivalently, the body has neither linear acceleration nor angular acceleration.
• We know that the linear acceleration and the angular acceleration of a stationary body are zero.

A book is kept on a table:

• In this case, the book will be stationary so it is an example of the equilibrium of a body.

A ball is moving downward freely under gravity:

• We know that when a ball moves freely under gravity, then only the gravitational force will act on the ball due to which the ball accelerates downward.
• Therefore ball is moving downward freely under gravity is not an example of the equilibrium of a body.
• Hence, option 1 is correct.

Explanation:

• Bacteria are the sole members of the Kingdom Monera. They are the most abundant micro-organisms.
• On the basis of origin, bacteria can be divided into two types - Archaebacteria & Eubacteria

Archaebacteria:

• These bacteria are special since they live in some of the harshest habitats such as extreme salty areas (halophiles), hot springs (thermoacidophiles) and marshy areas (methanogens).
• Archaebacteria differ from other bacteria in having a different cell wall structure and this feature is responsible for their survival in extreme conditions.
• For example - Methanogens are present in the gut of several ruminant animals such as cows and buffaloes and they are responsible for the production of methane (biogas) from the dung of these animals.

Additional Information 

Eubacteria:

• There are thousands of different eubacteria or ‘true bacteria’.
• They are characterised by the presence of a rigid cell wall, and if motile, a flagellum.
• The Eubacteria can be both autotrophic & heterotrophic.

TRUNCATE

• Is a DDL command hence it cannot be rolled back.
• It resets the identity of the table and locks that state of the table.
• Hence, Commit and Rollback will have no effect after TRUNCATE.

DELETE

• Is a DML command hence it can be rolled back
• It does not rest the identity of the table, it just locks the table row
• Hence Commit and Rollback can have effect depending on the lock techniques used.

Hence, it can be said that after the execution of ‘TRUNCATE’ operation, COMMIT, and ROLLBACK statements cannot be performed to retrieve the lost data, while ‘DELETE’ allows it.

It can also be said that after the execution of ‘DELETE’ operation, COMMIT and ROLLBACK statements can be performed to retrieve the lost data, while TRUNCATE does not allow it

NOTE