11 Maths Sets - Ex. 1.1

A set is a:

• Well-defined collection of objects

• Random group of numbers

• Only numbers

• A list of equations

Which of the following is a well-defined set?

• Set of good movies

• Set of tall boys

• Set of prime numbers less than 10

• Set of beautiful flowers

The set of vowels in English alphabet is:

• {a, b, c, d, e}

• {a, e, i, o, u}

• {b, d, f}

• {x, y, z}

Which of the following represents a null set?

• {0}

• {}

• {1, 2, 3}

• {null}

If A = {1, 2, 3}, then the number of elements in A is:

• 1

• 2

• 3

• 4

The symbol ∈ denotes:

• Belongs to

• Not belongs to

• Subset

• Empty set

If A = {2, 4, 6}, then 4 ∈ A is:

• True

• False

• Can't say

• Undefined

If B = {1, 3, 5}, then 2 ∈ B is:

• True

• False

• Not defined

• None of these

Which of the following is roster form?

• A = {x : x is a natural number < 5}

• A = {1, 2, 3, 4}

• A = {x ∈ N, x < 5}

• A = {x | x < 5, x ∈ N}

Set-builder form of A = {2, 4, 6, 8} is:

• A = {x ∈ N : x is even and ≤ 8}

• A = {x : x < 10}

• A = {2, 4, 6, 8, 10}

• A = {x : x is odd}