Directions: The Bar Graph given here shows the population (in crores) of India in various census years. Observe the graph and answer the question based on it.  

The percent increase in population from 1971 to 1981 is 

The difference between the interior and exterior angles at a vertex of a regular polygon is 150°. The number of sides of the polygon is

The distance between the coordinates ( x,y)  from the original point will be

In an exam, the average marks obtained by the students was found to be 60. After omission of computational errors, the average marks of 100 candidates had to be changed from 60 to 30 and the average with respect to all the examinees came down to 45 marks. The total number of candidates who took the exam, was. 

If four coins are tossed together, what is the probability of at least getting 2 heads?

₹ 26100 is divided between Ram and Shyam so that the interest that Ram receives in 3 years is the same as that Shyam receives in 6 years. If the interest rate of 4 % per annum then Ram's share is 

At what time between 5.30 and 6 will the hands of a clock be at right angles?

If sinθ – cosθ = 7/13 and 0⁰ < θ < 90⁰ , then the value of sinθ + cosθ is :