Lakshya Education MCQs

Question: ___________ is a factor of every number and every number is a factor of _____________.



Choose the suitable pair from the following.
Options:
A.2, next number 
B.2, itself   
C.1, itself   
D.1, next number 
Answer: Option C
: C

1 is an exact divisor of all the numbers.Also, any number is divisible byitself.

Therefore,1 is a factor of every number and e
very number is a factor of itself.

Submit Answer & Explaination

Earn Reward Points by submitting Detailed Explaination for this Question

More Questions on This Topic :

Question 1. Which of the following is the largest two-digit multiple of 19?
  1.    85
  2.    76
  3.    96
  4.    95
Answer: Option D
: D

19× 1 = 19
19
× 2 = 38
19
× 3= 57
19
× 4= 76
19
×5 = 95
19
× 6= 114
Hence, the largest two-digit multiple of 19 is 95.
Question 2. 7 consecutive composite numbers less than 100 are -
  1.    81, 82, 83, 84, 85, 86, 87
  2.    90, 91, 92, 93, 94, 95, 96
  3.    65, 67, 68, 69, 70, 71, 72
  4.    46, 47, 48, 49, 50, 51, 52
Answer: Option B
: B

All the numbers in the option:90, 91, 92, 93, 94, 95, 96have more than 2 factors, hence they are all composite numbers.
Question 3. The largest 3 digit composite number is:-
  1.    1000
  2.    999
  3.    989
  4.    949
Answer: Option B
: B

Composite numbers are those numbers which are not prime numbers except 1. 1 is regarded as a unique number.
The largest 3 digit number is 999 and it is a composite number. (divisible by 3, 9 etc)
Question 4. A perfect number is:
  1.    a number whose sum of factors is equal to twice the number.
  2.    a number whose sum of its digits is equal to the product of its digits.
  3.    a number whose sum of  factors is equal to thrice the number.
  4.    a number which is co-prime to every other number.
Answer: Option A
: A

A perfect number is a number for which the sum of all its factors is equal to twice the number. For example, 6 is a perfect number since the sum ofits factors 1, 2, 3 and 6 is 12 i.e. twice of 6.

Perfect numbers are also defined as those numbers that equalthe sum of all their factorsincluding 1 butexcluding the number itself.

Taking the same example of 6: sum of its factors excluding the numberitself i.e 6 = 1+2+3 = 6.

Check all Questions in this Topic : Click HERE