Question Discussion & Solution

Option - 1 - Stream - A stream is a body of water with surface water flowing within the bed and banks of a channel.

Option - 2 - Canal - Canals are waterways channels, or artificial waterways, for water conveyance, or to service water transport vehicles.

Option - 3 - Brook - A small stream.

Option - 4 - Bridge - A bridge is a structure built to span a physical obstacle, such as a body of water, valley, or road, without closing the way underneath.

All except bridge contain water.

A drone is a male honey bee. Similarly, A male deer is called stag.

The correct answer is option 4) i.e. ∞

CONCEPT:

• ​The time period of a pendulum is given by the equation:

​\(\Rightarrow T = 2\pi\sqrt{\frac {L}{g}}\)

Where L is the length of the string of pendulum and g is the acceleration due to gravity.

EXPLANATION:

• At a height of 900 km from the earth's surface gravity is absent.

Therefore, g = 0.

Substituting g = 0,

\(\Rightarrow T = 2\pi\sqrt{\frac {L}{0}} = ∞\)

Thus, the time period of the pendulum at a distance of 900 km from the Earth will be infinite.

The correct answer is Daulatmal Bhandari.

• Daulatmal Bhandari formed the 'Praja Mandal' in Jaipur.

Key Points

• Daulatmal Bhandari :
  • He was Chief Justice of Rajasthan High Court.
  • He was also a Member of the First Lok Sabha from 1952 to 1955
  • He formed the Azad Morcha in Jaipur and took satyagraha in 1942.
  • He also organized ‘Praja Mandal’ in Jaipur State.
  • Daulatmal Bhandari served as the Development and Agriculture Minister in Rajasthan state.

Additional Information

• Ram Kinkar was a member of the Uttar Pradesh Legislative Assembly.
• Vitthal Baburao Tupe was a Member of the Twelfth Lok Sabha.

The correct answer is option 3 i.e. the Atomic Number

• The periodic table is based on Atomic Number.
• The atomic number is the number of protons found in the nucleus of every atom of that element. 
• The periodic table is managed by the International Union of Pure and Applied Chemistry, or IUPAC.
• In 1869, Dimitri Mendeleev included 63 known elements arranged according to increasing atomic weight. But there were many elements he could not place in the periodic table and with the discovery of new noble elements, there was a need to arrange the elements. Henry Moseley later arranged the elements in the periodic table by their number of protons rather than their atomic weights.
• The modern periodic table orders the elements according to increasing atomic number rather than increasing atomic weight.
• There are 118 elements in a periodic table. There are seven periods and eighteen groups in the modern periodic table.
• On moving from left to right in a period, the size of atoms(atomic size) decreases.
• On moving from left to right in a period, the metallic character of elements decreases, whereas the non-metallic character increases.
• While going down in a group of the periodic table, the size of atoms increases (or atomic size increases).
• While going down in a group of the periodic table, the metallic character of elements increases.
• Electronegativity and reactivity of non-metals increase along the period and decrease down the group.