NDA || Weekly Revision Quiz 2020

Consider the following statements pertaining to a frequency polygon of a frequency distribution of a continuous variable with seven class intervals of equal width:

1) The original frequency distribution can be reconstructed from the frequency polygon.

2) The frequency polygon touches the x-axis in its extreme right and extreme left.

Which of the above statements is/are correct?

What is the total area of three equilateral triangles inscribed in a semicircle of radius 2 cm?

If , then the value of is –

If  and , then x+y is given by:

The terminal potential difference of a cell when short-circuited is ( = E.M.F. of the cell)

When light is travelling from vacuum to any medium then after refraction

After the reaction of alkaline KMnO₄ with another compound Y, compound X is formed, followed by acidification. In the presence of H₂SO₄ compound X and Y reacts and form sweet-smelling compound Z. the compound X and Z are

Match List I with List-II and choose the correct code given below:

Which method of water purification does not kill microorganism?