Question Discussion & Solution

The correct answer is Archimedes' principle.

Concept:

Archimedes principle:

the principle of Archimedes states “When a body is immersed in a liquid, an upward thrust, equal to the weight of the liquid displaced, acts on it.”

Thus, when a solid is fully immersed in a liquid, it loses weight which is equal to the weight of the liquid it displaces.

i.e., \(Apperent\;weight = actual\;weight - buoyant\;force = mg - \rho gV\)

where m is mass of the object, ρ is the density of the fluid

Hence if there is no gravity, there is no Upward Thrust.

The upward force applied to the object is called the buoyant force.

Here,

ρ = density of liquid

g = acceleration due to gravity

V = volume of liquid displaced by the object

Explanation:

Archimedes’ principle, a physical law of buoyancy states that any body completely or partially submerged in a fluid (gas or liquid) at rest is acted upon by an upward, or buoyant, force the magnitude of which is equal to the weight of the fluid displaced by the body.

Hence floating of the ship is based on Archimedes principle:

• 9.8 m/s² is the value of acceleration due to the gravity of the surface of the Earth.
• The acceleration which is gained by an object because of the gravitational force is called acceleration due to gravity.
• Its SI unit is m/s²

Jail must have Lock other options are not necessary part of jail. There can be or cannot be prisoner in jail. Rods are not necessary jail can be a room even Jailor is not always necessary.

The correct answer is 20 August, 1949

Key Points

• Rajasthan Public Service Commission was established on 20 August 1949.
• At the time of formation of Rajasthan, the institution of Public Service Commission existed in only three of the 22 covenanting states viz. Jaipur, Jodhpur and Bikaner.
• The successor administration after the merger of the princely states promulgated an ordinance on 16th August, 1949 establishing the Rajasthan Public Service Commission Ajmer which was published in Rajasthan Gazette at 20th August, 1949.
• Rajasthan Public Service Commission came into effect on 22 December, 1949.

Additional Information

• Rajasthan Board of Secondary education was set up on 4 December, 1967.
• Union Public Service Commission was set up on 1 October, 1926.
• Staff Selection Commission was set up on 4 November, 1975.

The correct answer is Viticulture.

• Cultivation of grapes called Viticulture.

Key Points

• Cultivation of grapes either for wine production or for raw consumption (table grapes) is called Viticulture.
• China is the leading producer of grapes.
• It accounts for 16.9% of global production.
• China is followed by Italy at 10.8%, and later by the United States at 8.7%.

Additional Information

• Horticulture is a type of agriculture in which fruits and vegetables are grown.
• The breeding, rearing, and transplantation of fish are called pisciculture.
• Sericulture is the production of raw silk by means of raising caterpillars.