The sun is visible two minutes before sunrise and about two minutes sunset due to atmospheric refraction. (True/False)

The sun appears before the sun rise and after sun set for few minutes, why?

The exchange of information between two persons is called communication. (True/False)

The exchange of information between two persons is called communication. (True/False)

Consider a sunlike start at a distance of 2 parsecsWhen it is seen through a telescope with 100 magnification, what should be the angular size of the star? Sun appears to be (1//2)^@ from the earth. Due to atmospheric fluctuationsw, eye can't resolve objects smaller than 1 arc minute.

A company manufactures two types of novelty souvenirs made of plywood. Souvenirs of type A require 5 minutes each for cutting and 10 minutes each for assembling. Souvenirs of type B require 8 minutes each for cutting and 8 minutes each for assembling. There are 3 hours 20 minutes available for cutting and 4 hours for assembling. The profit is Rs 5 each for type A and Rs 6 each for type B souvenirs. How many souvenirs of each type should the company manufacture in order to maximise the profit?

A ray of light is the path followed by light between two points. (True/false)

Two pipes running together can fill cistern in 6 minutes. One pipe takes 5 minutes more than the other to fill the cistern, find the time in which each pipe would fill the cistern.

An electric kettle has two coils. When one of these is switched on, the water in the kettle boils in 6 minutes. When the other coil is switched on, the water boils in 3 minutes. If the two coils are connected in series, find the time taken to boil the water in the kettle.

One coolie takes two minutes to raise a box from platform to train. Another coolie takes one minjte, work done