● Weight is not a fundamental quantity in physics. Weight is defined as the force exerted on a body by gravity. This is often expressed in the formula W = mg, where W is the weight, m is the mass of the object, and g is the gravitational acceleration.

● Quantities independent of other physical quantities are known as fundamental physical quantities. There are 7 fundamental physical quantities.

● Length

● Mass

● Time

● Electric current

● Thermodynamic temperature

● Amount of substance

● Luminous intensity

● Chethiyagiri Vihara' is a Buddhist festival celebrated in Sanchi.

● It is attended by Buddhist monks and pilgrims.

● The relics are brought out during the festival and the pilgrims come to pay their homage from all over the country.

● Sanchi is a religious place with historical and archaeological significance.

● Buddhism is one of the world's largest religions and originated 2,500 years ago in India.

● It is an Indian religion or philosophical tradition based on a series of original teachings attributed to Gautama Buddha.

● It is the world's fourth-largest religion with over 520 million followers.

* Arunanchal Pradesh does not share boundary with Sikkim.

* Sikkim shares boundary with Nepal, China, West Bengal and Bhutan.

* Sikkim is the least populous and second smallest among the Indian states.

* Kangchenjunga is the highest peak of Sikkim.

* Sikkim's capital and largest city is Gangtok.

Let the distance be x km.

Time taken at the speed of 80 km/hr =

Time taken at the speed of 60 km/hr =

∴ he rested for

He rested per hour =
Method 2:
We know, for a fixed distance speed and time are inversely proportional to each other.
so,
          Condition I : Condition II
Speed       80       :      60
Time         60       :      80
=               3       :       4 
According to the question;
4 Unit time = 1 hr
so, 1 unit time = 15min.
Means, if he stops 15 min per hour his average speed will reduce from 80kph to 60kph.

Thus, R is the last letter.
Hence, option B is the correct answer.

All except ‘Heart’ are non-vital organs while ‘Heart’ is a vital organ.
Hence, option C is the correct answer.

Option C has the grammatically incorrect part. The error is in the use of the word 'supporting'. 

• The part "to recognise" is an infinitive structure (to + V1).
  
  It is used to express purpose. 
  
  e.g. They decided to start a business together.
  
  
• The conjunction 'and' joins two similar words (of the same forms). 
  
  
• Thus, the use of 'supporting' is erroneous and it should be replaced with the V1 form 'support' to maintain the symmetry of the sentence.  

The idiom 'beating the air' means 'continuing to make futile attempts, fighting to no purpose'.

Hence, option C is the correct answer.

The given sentence is in the active form. It is in the simple past tense.

The structures for active/passive voices are:

Active: Subject + verb (IInd form) + object...

Passive: Object + was/were + verb (IIIrd form) + by + subject...

So, with the help of the above structures, we can convert the given sentence into passive voice: The leader’s speech was loudly cheered by the audience.

Hence, option A is the correct answer.