Questions

It is ABACUS.

Words formed are as below 

BUS
CAB
CUB
US

For the first time in Sri Lanka, the United Nation Vesak Day celebration will be held in Colombo and Kandy from May 12 to 14. Indian Prime Minister Narendra Modi will be the chief guest of the opening ceremony which will be held at BMICH in Colombo while Nepali President Bidhya Devi Bhandari will attend for the closing ceremony which is scheduled to be held at the Sri Dalada Maligawa premises in Kandy.

Jupiter has 67 natural satellites. Eight of Jupiter's moons are regular satellites, with 4 large, spherical moons, and 4 smaller moons that orbit closer to Jupiter. Jupiter has an additional 55 tiny irregular satellites.

The planet with the second highest number of moons is Saturn, with 61 moons.

Earth has only one natural satellite i.e, Moon.

Mercury and Venus have no satellites.

It will stop at a height where the weight of the balloon with contents is equal to the weight of air displaced by it, i.e , when the upthrust is equal to the downthrust. The question of bursting will depend on how much difference of pressure inside and outside , the material of the balloon can withstand. It is assumed the balloon is filled with a lighter than air gas like hydrogen or helium.

State-run NTPC said the company has forayed into electric vehicle charging business and has set up first such charging stations at its offices in Delhi and Noida. Adding that the move will push demand for electric vehicles, an official said, "The main objective in setting up the charging points is to be part of promoting clean energy transportation."

The other answers could be accurate in specific situations, but their role alone does not meet the keyb criterion of being "external" to the project team. Answers A, B, and D are incorrect because these individuals are not external to the project.