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:

The cube is coloured on two adjacent faces (let us consider that the top and back surfaces are coloured)

So, the cubes on the surface having no colour will be 12 cubes on the front surface, 6 cubes on the right surface, 6 cubes on the left surface and 4 cubes at the bottom two surface.

So, cubes with no colour are:

12 + 6 + 6 + 4 = 28

Again, small cubes inside the big cube with no surface coloured is 8.

Therefore, cubes with no colour are = 28 + 8 = 36

The answer is Bundi.

Key Points

• Kanak Sagar is a historic lake at the Dugari town of the Bundi district in Rajasthan. 
  • It is famous for migrated birds hanging around the whole year like Pelicans, Black-tailed Godwit.
  • The Dugari fort is another attraction of this Kanak Sagar. 

Important Points

Major lakes of Rajasthan:

The correct answer is Sunderban Delta.

• Sunderban Delta is the largest delta in India.

Key Points

• Sunderbans has spread over 1330.10 sq. km.
• It is formed by the Ganga and Brahmaputra rivers in West Bengal and Bangladesh. 
• Sundarbans is also known for the mangrove forest which is one of the largest such forests in the world.
• Sundarbans was included in the World Heritage site in 1987.
• East Flowing Rivers are known as Delta forming rivers
  • East flowing rivers do not form estuaries.
  • East flowing rivers fall in the Bay of Bengal.

Additional Information

• A delta is a depositional feature of a river which is formed at the mouth of the river. 
• Largest River without is Delta Narmada and Tapti.

Total number of sarees = 40

Code number written on the 16^th saree = 85091

Code number written on the 29^th saree = 85091 + (29 – 16) = 85091 + 13 = 85104