CBSE - Aptitude Mathematics

Sita walks 7 km in 1 1/2 hr and Bina 450 min 5 minutes. Who walks faster than 4 1/2 km/hr? 1. Sita 2. Both of them 3. Bina 4. More data is necessary to know the answer

The value of the derivative of f(x) = |x-1|+|x-3| at x = 2 is: 1. -2 2. 2 3. 0 4. not defined

Variance of distribution is 100, then its standard deviation will be 1.25 2.50 3.80 4.10

If x and y are negative, then which of the following statements is (are) always true? I. x + y is positive II. xy is positive III. x - y is positive 1. I only 2. II only 3. III only 4. I and III only

The unit's digit in the product 7 35 x 3 71 X 11 55 is (1) 1 (2) 3 (3) 7 (4) 9