The ratio of LCM and HCF of the least composite and the least prime numbers is (a) "1:2," (b) "2:1.," (c) "1:1.," (d) "1:3"

The least prime number is (a)1 (b)2 (c)3 (d)5

Write the H.C.F. of the smallest composite number and the smallest prime number.

The successor of the smallest prime number is 1 (b) 2 (c) 3 (d) 4

The total number of even prime numbers is (a) 0 (b) 1 (c) 2 (d) unlimited

If the ratio of the areas of two square is 9:1, then the ratio of their perimeters is (a) 2:1 (b) 3:1 (c) 3:2 (d) 4:1

If the heights of two cones are in the ratio of 1:4 and the radii of their bases are in the ratio 4:1, then the ratio of their volumes is (a) 1:2 (b) 2:3 (c) 3:4 (d) 4:1

A number is selected at random from the numbers 1 to 30. The probability that it is a prime number is (a) 2/3 (b) 1/6 (c) 1/3 (d) (11)/(30)

The number of primes between 90 and 100 is (a) 0 (b) 1 (c) 2 (d) 3

If the angles of a triangle are in the ratio 4:1:1, then the ratio of the longest side to the perimeter is (a) sqrt(3):(2+sqrt(3)) (b) 1:6 (c) 1:2+sqrt(3) (d) 2:3

Two harmonic waves travelling in the same medium have frequency in the ratio 1:2 and intensity in the ratio 1:36. Their amplitude ratio is (a) 1:6 (b) 1:8 (c) 1:72 (d) 1:3