Que 1
If a= x⁴y²,b= x²y³ then LCM (a,b) is
a) x⁸y⁶
b ) x⁶y⁵
c) x⁴y³
d) none of these
Ans ( c)
Que 2
If LCM (32,a) = 64 and HCF (32,a) = 4 then value of a is
a) 16
b ) 8
c) 20
d) 10
Ans (b)
Que 3
Three bells rings at intervals 5,3,15 minutes. All three rang at 10 am when will they ring again together
a) 10:10 am
b) 10 :15 am
c) 10: 20 am
d ) none of these
Ans ( b )
Que 4
HCF of two numbers is 4 their product is 160 LCM is
a) 40
b) 60
c) 80
d) 120
Ans (a)
Que 5
Find least number that is divisible by all numbers from 3 to 7 ( both numbers included)
a) 400
b) 410
c) 420
d) 430
Ans ( c)
Que 6
What is smallest number must be multiplied and denominator so that the decimal number 14588/625 will be terminated
a) 4
b)18
c) 16
d) 20
Ans (c)
Que 7
If x² = ( 1+ 2/36. + 5/ 6) then value of x is
a) irrational
b) rational
c) whole
d) integer
Ans (a)
Que 8
Prime factors of denominator of a rational number with decimal expansion 62.47 are
a) 2 and 35
b) 2 and 5
c) 3 and 5
d) 4 and 5
Ans ( b)
Que 9
The decimal expansion of rational number 53/2³×5. will terminate after how many decimal
a) 1
b) 3
c) 4
d) 2
Ans ( b)
Que 10
The decimal number of (21/8 +7/40) terminates after how many places
a) 2
b) 1
c) 3
d) 4
Ans ( b)
Que 11
The smallest number by which 1/17 should be multiplied so that decimal expansion terminate after one decimal place
a) 17/100
b) 17/10
c) 100/17
d) 10/17
Ans ( b)
Solution
