Question 11 Mark
Sum of two prime numbers is always even.
Answer
View full question & answer→False $[\because 7 + 2 = 9$ (odd)]
Questions
TRUE-FLASE [1 Marks Each]
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38 questions · self-marked practice — reveal the answer and mark yourself.
Question 21 Mark
Prime numbers do not have any factors.
Answer
View full question & answer→False $[\because 3$ is a prime number having $1$ and $3$ as its factors]
Question 31 Mark
All prime numbers are odd.
Answer
$\therefore L.C.M$. of $63, 70$ and $77 = 2 \times 3 \times 3 \times 5 \times 7 \times 11$
$= 6930$
Hence, the minimum distance each should cover so that all cover the distance in complete steps is $6930\ cm.$
View full question & answer→| $2$ | $63,70,77$ |
| $3$ | $63,35,77$ |
| $3$ | $21,35,77$ |
| $5$ | $7,35,77$ |
| $7$ | $7,7,77$ |
| $11$ | $1,1,11$ |
| $1,1,$ |
$\therefore L.C.M$. of $63, 70$ and $77 = 2 \times 3 \times 3 \times 5 \times 7 \times 11$
$= 6930$
Hence, the minimum distance each should cover so that all cover the distance in complete steps is $6930\ cm.$
Question 41 Mark
If an even number is divided by $2$, the quotient is always odd.
Answer
View full question & answer→False $[\because 6 + 2 = 3$ (odd)]
Question 51 Mark
The product of three odd numbers is odd.
Answer
View full question & answer→True $[\because 5 x 7 x 9 = 315$ (odd)]
Question 61 Mark
The sum of two odd numbers and one even number is even.
Answer
View full question & answer→True $[\because 3 + 5 + 6 = 14$ (even)]
Question 71 Mark
Here are two different factor trees for $60$. Write the missing numbers.
Answer
View full question & answer→False $[\because 3 + 5 + 7 = 15$ (odd)]
Question 81 Mark
The product of two even numbers is always even.
Answer
View full question & answer→True $[\because 4 \times 6 = 24$ (even)]
Question 91 Mark
All even numbers are composite numbers.
Answer
View full question & answer→False $[\because 2$ is even but not composite number]
Question 101 Mark
$2$ is the only even prime number.
Answer
View full question & answer→True $[\because 2$ is even and the lowest prime number]
Question 111 Mark
$LCM$ of any two numbers is always divisible by their $HCF$
Answer
View full question & answer→true
Question 121 Mark
All the prime numbers except $2$. are odd numbers.
Answer
View full question & answer→true
Question 131 Mark
There is only one prime number between $91$ and $100$
Answer
View full question & answer→true
Question 141 Mark
The sum of any two prime numbers is always an odd number
Answer
View full question & answer→false
Question 151 Mark
$16$ and $25$ are co-prime numbers
Answer
View full question & answer→true
Question 161 Mark
$12$ and $33$ are co-prime numbers:
Answer
View full question & answer→false
Question 171 Mark
$LCM$ of any two numbers is greater than their $HCF$
Answer
View full question & answer→true
Question 181 Mark
$HCF$ of two numbers may be one of the two numbers
Answer
View full question & answer→true
Question 191 Mark
$LCM$ of two numbers may be one of the two numbers.
Answer
View full question & answer→true
Question 201 Mark
All the numbers which are divisible by $2$. may not be divisible by $4$
Answer
View full question & answer→true
Question 211 Mark
Co-prime numbers are always prime numbers.
Answer
View full question & answer→false
Question 221 Mark
If a number is divisible by $7$. It is also divisible by $14$
Answer
View full question & answer→false
Question 231 Mark
If a number is divisible by $9$, it is also divisible by $3$
Answer
View full question & answer→true
Question 241 Mark
On dividing an even number by $2.$ we always get an even number
Answer
View full question & answer→false
Question 251 Mark
$LCM$ of any two numbers is always divisible by their $HCF$
Answer
View full question & answer→true
Question 261 Mark
All the prime numbers except $2$. are odd numbers.
Answer
View full question & answer→true
Question 271 Mark
There is only one prime number between $91$ and $100$
Answer
View full question & answer→true
Question 281 Mark
The sum of any two prime numbers is always an odd number
Answer
View full question & answer→false
Question 291 Mark
$16$ and $25$ are co-prime numbers
Answer
View full question & answer→true
Question 301 Mark
$12$ and $33$ are co-prime numbers:
Answer
View full question & answer→false
Question 311 Mark
$LCM$ of any two numbers is greater than their $HCF$
Answer
View full question & answer→true
Question 321 Mark
$HCF$ of two numbers may be one of the two numbers
Answer
View full question & answer→true
Question 331 Mark
$LCM$ of two numbers may be one of the two numbers.
Answer
View full question & answer→true
Question 341 Mark
All the numbers which are divisible by $2$. may not be divisible by $4$
Answer
View full question & answer→true
Question 351 Mark
Co-prime numbers are always prime numbers.
Answer
View full question & answer→false
Question 361 Mark
If a number is divisible by $7$. It is also divisible by $14$
Answer
View full question & answer→false
Question 371 Mark
If a number is divisible by $9$, it is also divisible by $3$
Answer
View full question & answer→true
Question 381 Mark
On dividing an even number by $2$. we always get an even number
Answer
View full question & answer→false