Exams

Molecular clocks are based on the idea that _____.

In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence. In case no improvement is needed, select "no improvement".

The battle (had been raging) for some time.

If x = 5 + 15 - 1 & y = 5 - 15 + 1, then find the value of x2 - y2.

What is the ratio of radius of incircle and circumcircle for an equilateral triangle with an area of 22√3 sq. units?

The standard deviation of the set {10, 11, 12, 9, 8} is

The difference between Peter and Preeti's ages is 5 years. When they married each other 35 years ago, 4 times Peter's age was the same as 5 times the age of Preeti. What is the current sum of their ages?

A sum of Rs 800 becomes Rs 1000 in 2 years at simple interest. What is the per annum rate of interest (in percent)?

A shopper in a mart loads his trolley and walks 30 m through an alley which is going South, then he turns to his left and walks 10 m, then he turns North and walks another 10 m, then he turns West and walks 45 m and then he turns North and walks 20 m. Where is he now with reference to his starting position?