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

State whether the statement is True or False? Also give justification.

One value of θ which satisfies the equation sin⁴θ - 2sin²θ - 1 lies between 0 and 2π.

Identify whether the following is set or not? Justify your answer.

The collection of all months of a year beginning with the letter J.

Identify whether the following is set or not? Justify your answer.

The collection of ten most talented writers of India.

Identify whether the following is set or not? Justify your answer.

A team of eleven best-cricket batsmen of the world.

Identify whether the following is set or not? Justify your answer.

The collection of all boys in your class.

Identify whether the following is set or not? Justify your answer.

The collection of all natural numbers less than 100.

Identify whether the following is set or not? Justify your answer.

A collection of novels written by the writer Munshi Prem Chand.

Identify whether the following is set or not? Justify your answer.

The collection of all even integers.

Identify whether the following is set or not? Justify your answer.

The collection of questions in this Chapter.

Identify whether the following is set or not? Justify your answer.

A collection of most dangerous animals of the world.

Let A = {1, 2, 3, 4, 5, 6}. Insert the appropriate symbol ∈ or ∉ in the blank space:

5 _____ A

Write the following set in roster form:

A = {x : x is an integer and –3 ≤ x < 7}

Write the following set in roster form:

B = {x : x is a natural number less than 6}

Write the following set in roster form:

C = {x : x is a two-digit natural number such that the sum of its digits is 8}

Write the following set in roster form:

D = {x : x is a prime number which is divisor of 60}

Write the following set in roster form:

E = The set of all letters in the word TRIGONOMETRY

Write the following set in roster form:

F = The set of all letters in the word BETTER

Write the following set in the set-builder form:

{3, 6, 9, 12}

Write the following set in the set-builder form:

{2, 4, 8, 16, 32}

Write the following set in the set-builder form:

{5, 25, 125, 625}