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Online Arithmetic aptitude Test ( HCF and LCM )


Question 1 :

Four different electronic devices make a beep after every 30 minutes, 1 hour, 1.5 hour
and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at :

a) b)
c) d)
e) f)
Question 2 :

The H.C.F. of two numbers is 23 and the other two factors of their L.C.M. are 13 and 14. The larger of the two numbers is :

a) b)
c) d)
e) f)
Question 3 :

H.C.F. of 4 x 27 x 3125, 8 x y x 25 x 7 & 16 x 81 x 5 x 11 x 49 is :

a) b)
c) d)
e) f)
Question 4 :

The H.C.F. of 1.75, 5.6 and 7 is :

a) b)
c) d)
e) f)
Question 5 :

Product, of two co-prime numbers is 117. Their L.C.M. should be :

a) b)
c) d)
e) f)
Question 6 :

Which of the following has most number of divisors ?

a) b)
c) d)
e) f)
Question 7 :

The L.C.M. of two numbers is 45 times their H C.K. If one of the numbers is 125 and the sum of H.C.F. and L.C.M. is 1150, the other number is :

a) b)
c) d)
e) f)
Question 8 :

Which of the following is a pair of co-primes ?

a) b)
c) d)
e) f)
Question 9 :

A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 2.ri2 seconds, B in 308 seconds and C in 198 seconds, all starting at the same point. After what time will they meet again at the starting noint ?

a) b)
c) d)
e) f)
Question 10 :

252 can be expressed as a product of primes as :

a) b)
c) d)
e) f)
Question 11 :

The H.C.F. and L.C.M of two numbers are 11 and 385 respectively. If one number lies between 75 and 125, then that number is :

a) b)
c) d)
e) f)
Question 12 :

The L.C.M. of 22, 54, 108, 135 and 198 is :

a) b)
c) d)
e) f)
Question 13 :

The H.C.F. of 2/3. 8/9. 64/81 and 10/27 is :

a) b)
c) d)
e) f)
Question 14 :

Let the least number of six digits, which when divided by 4, 6, 10 and 15 leaves in each case the same remainder of 2, be N. The sum of the digits in N is :

a) b)
c) d)
e) f)
Question 15 :

The H.C.F. of 3666 and 3444 is :

a) b)
c) d)
e) f)