Arts (English Medium) Class 11 - CBSE Question Bank Solutions

Write the negation of the following simple statements.

`sqrt(5)` is a rational number.

Write the negation of the following simple statements.

2 is not a prime number.

Write the negation of the following simple statements.

Every real number is an irrational number.

Write the negation of the following simple statements.

Cow has four legs.

Write the negation of the following simple statements.

A leap year has 366 days.

Write the negation of the following simple statements

All similar triangles are congruent.

Write the negation of the following simple statements

A leap year has 366 days.

Write the negation of the following simple statements

Area of a circle is same as the perimeter of the circle.

Let A = {1, 2, 3, 4}, B = {1, 5, 9, 11, 15, 16} and f = {(1, 5), (2, 9), (3, 1), (4, 5), (2, 11)}. Is the following true?

f is a function from A to B

Justify your answer in case.

The following example is the null set example or not?

Set of odd natural numbers divisible by 2

Find the values of other five trigonometric functions if `cos x = -1/2`, x lies in third quadrant.

Find the values of other five trigonometric functions if `sin x = 3/5` x lies in second quadrant.

Find the values of other five trigonometric function if `cot x = 3/4`, x lies in quadrant.

Find the values of other five trigonometric function if `sec x = 13/5`, x  lies in fourth quadrant.

Find the values of other five trigonometric functions if ` tan x = - 5/12`, x lies in second quadrant.

Find the value of the trigonometric function tan `(19pi)/3`.

Find the value of the trigonometric function sin `(-11pi)/3`.

Find the value of the trigonometric function cot `(-(  15pi)/4)`.