Question Discussion & Solution

CONCEPT:

• Power: The rate of work done is called power.
  • It is denoted by P.
  • Mathematically it is written as

\(Power\;\left( P \right) = \frac{{\;W}}{{t}}\)

CALCULATION:

Given - mass of 1^st person (m₁) = 80 kg, mass of 2^nd person (m2) = 60 kg, time (t₁) = 12 sec, and time (t2) = 11 sec​

• The power to take an object to a certain height in 12 sec by 1^st person is 

\(\Rightarrow P_1 = \frac{mgh}{t}=\frac{80gh}{12}\)       ----(1)

• The power to take an object to a certain height in 11 sec by 2^nd person is 

\(\Rightarrow P_1 = \frac{mgh}{t}=\frac{60gh}{11}\)       ----(2)

On dividing equations 1 and 2, we get

\(\Rightarrow \frac{P_1}{P_2} =\frac{\frac{80gh}{12}}{\frac{60gh}{11}}=\frac{11}{9}\)

In this question shows that Lotus, Rose and Lily are kind of flower. So Marigold is also kind of flower but apple is the fruit, Red is color and flower is flower.

So most closely word is Marigold.

Hence, option 2 is the correct answer.

Total = Top + Bottom – 1

25 = 12 + Bottom – 1

25 – 11 = Bottom

Bottom = 14^th

The correct answer is Kalology.

Key Points

• The study of human beauty is called Kalology.
  • Kalology is the study of beauty and the ways in which beauty influences society.
  • This study is focused primarily on human attractiveness, rather than the broader field of aesthetics, and was popularized during the 19th century when philosophers attempted to codify beauty and create a uniform system for evaluating it.
  • A scale was even proposed, probably jokingly, which rated beauty in terms of the theoretical beauty of Helen of Troy, who allegedly had a face to launch 1,000 ships.

Additional Information

The correct answer is Afforestation.

• Afforestation is not a cause of soil erosion.

Key Points

• Afforestation is planting trees on an area of land in order to form a forest.
• Removal of the top layer of soil when it is exposed to wind and rain is easily blown or washed away. This condition is known as soil erosion.
  • Basically, the soil cover is removed by two powerful agents– (i) Running water, (ii) Wind.
• Deforestation, overgrazing, floods, Landslides and heavy rainfall have led to soil erosion.