Question 1 :
The total number of prime numbers between $120$ and $140$ are

Question 3 :
What is the sum of the smallest prime and the largest prime less than $10$?

Question 6 :
The number of composite numbers between $101$ and $120$<br/>(excluding both) are<br/>

Question 10 :
If the HCF of two numbers is 1, then they are called as ?

Question 11 :
A student was asked to find the sum of all the prime numbers between $10$ and $40.$He found the sum as $180.$Which of the following statements is true?

Question 12 :
How many number of prime numbers are there between 301 and 320?<br>

Question 13 :
If $p$ and $q$ are prime numbers satisfying the condition $p^{2} - 2q^{2} = 1$, then the value of $p^{2} + 2q^{2}$ is

Question 14 :
The smallest positive divisor greater than 1 of a composite number 'a' is ______<br>

Question 16 :
What is the product of the greatest prime number that is less than $50$ and the smallest prime number that is greater than $50$?

Question 17 :
Mark the correct alternative of the following.<br>Which of the following numbers is a prime number?<br>

Question 20 :
The number 10 has four factors: 1,2, 5 and 10. The table below lists the number of factors for some numbers<br/><table class="wysiwyg-table"><tbody><tr><td>Numbers</td><td>Number of factors</td></tr><tr><td>$21$</td><td>$4$</td></tr><tr><td>$23$</td><td>$2$</td></tr><tr><td>$25$</td><td>$3$</td></tr><tr><td>$27$</td><td>$4$</td></tr><tr><td>$29$</td><td>$2$</td></tr></tbody></table>From this, we can say that the number of prime numbers between $20$ and $30$ is:<br/>

Question 21 :
If m and n are prime numbers greater than $2$, which of the following could also be a prime number?

Question 23 :
Choose the composite numbers from the following numbers $87, 67, 45, 34, 23, 27, 33$.

Question 25 :
The numbers which have more than two factors are called _______.