Question Discussion & Solution

Keel, tiller and helm are the parts of a ship whereas fuselage is a part of aircraft.

CONCEPT:

Force:

• The interaction which after applying on a body changes or try to changes the state of rest or state of motion is called force.
• It is denoted by F. The SI unit of force is Newton (N).

Force (F) = Mass (m) × acceleration (a)

• If more than one force is acting on a body, then the effect on the body is due to the net force.
• A stationary object on which no force is acting remains stationary.
• An object in motion continues to move with the same speed and direction when no force is acting on the object. This is Newton’s first law of motion. 

​CALCULATION:

Given:

Force = 20 N

Acceleration (a) = 2 m/s2

⇒ Force (F) = m a 

⇒ m = F/a = 20/2 = 10 kg.

So, option 4^th is correct.

Explanation:

• One of the most important contributors to the early construction of the periodic table was Russian scientist Dmitri Ivanovich Mendeléev.
• Mendeleev Periodic Table was introduced in 1869, following the rejection of Newlands Octave Law.
• Elements were arranged in Mendeleev's periodic chart according to their fundamental property, atomic mass, and chemical characteristics.
• Only 63 elements were known at Mendeleev's time.
• Mendeleev discovered that the properties of elements are the periodic function of their atomic mass in a periodic pattern after analysing their qualities.
• He ordered the elements in the periodic table so that those with comparable properties were in the same vertical columns.
• He developed a periodic law based on this finding, which states:- “The periodic function of an element's atomic mass is its property.”
• Demerits -  
  1. He couldn't find hydrogen in the periodic chart.
  2. Moving from one element to the next caused an irregular increase in atomic mass. As a result, the amount of elements that have yet to be identified is unpredictable.
  3. Isotopes were not considered. Later on, isotopes of elements that defied Mendeleev's periodic law were discovered.​ 

Additional Information

Mendeleev left places for undiscovered elements. 

• scandium, gallium and germanium, discovered later, have properties similar to Eka–boron, Eka–aluminium and Eka–silicon, respectively. So undiscovered elements were named also by Mendeleevs. 
• It was not very strictly based on increasing order of atomic mass.  For example, cobalt (atomic mass 58.9) appeared before nickel (atomic mass 58.7) based on periodic properties. 
• Noble gases can easily get adjusted in Mendeleev periodic table even they were discovered after the periodic table. 

The correct answer is Jaipur.

• The Legislative Assembly of Rajasthan is located at Lalkothi, Jaipur.

Key Points

• Legislative Assembly of Rajasthan ​
  • The Legislative Assembly of Rajasthan is located at Lalkothi, Jaipur.
  • Presently, it comprises 200 members who are directly elected from single-seat constituencies.
  • The building of the Rajasthan Legislative Assembly is one of the most modern legislature complexes in India. Situated in a sprawling 16.96 acres campus - in Jyoti Nagar, Jaipur.
  • Work on this project commenced in November 1994 and was completed in March 2001.
  • The exterior of the building has been provided with famous traditional features of Rajasthan such as Jharokas, Chhatries, Kamani, Baradaries, Arches, Todies, etc. in Jodhpur and Bansi Paharpur stone.
  • The interior entrance lounges have been decorated in the famous Rajasthani traditional art on walls and ceilings representing the traditional art of four regions of Jaipur, Shekhawati, Marwar, and Mewar. 

Additional Information

• 15^th Rajasthan Legislative Assembly
  • Governor, Rajasthan
    • Shri Kalraj Mishra
  • Speaker, Rajasthan Legislative Assembly
    • Dr. C.P. Joshi
  • Chief Minister Rajasthan
    • Sh. Ashok Gehlot

Here the pattern is,