19
Q:

The product of three consecutive even numbers when divided by 8 is 720. The product of their square roots is :

A) 12 sqrt(10) B) 24 sqrt(10)
C) 120 D) none of these

Answer:   B) 24 sqrt(10)



Explanation:

Let the numbers be x, x + 2 and X + 4.

Then, x(x + 2)(x +4) / 8 = 720 => x(x + 2)(x +4) = 5760.

√x  *  √(x + 2) * √(x +4) = √x(x +2)(x + 4 ) = √5760  =  24√10.

Q:

The coefficient of x in(×-3y)3 is :

 

A) 3y2 B) 27y2
C) -27y2 D) -3y2
 
Answer & Explanation Answer: B) 27y2

Explanation:
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0 1142
Q:

The largest number which should replace * in the number 2365*4 to make the number divisible by 4 is:

 

A) 9 B) 2
C) 0 D) 8
 
Answer & Explanation Answer: D) 8

Explanation:
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0 1553
Q:

43÷16×2-1=?

A) 3 B) -2
C) 8 D) 15
 
Answer & Explanation Answer: D) 15

Explanation:
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0 381
Q:

If a+1a=5 then a3+a31 is:

 

A) 110 B) 10
C) 80 D) 140
 
Answer & Explanation Answer: A) 110

Explanation:
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0 1453
Q:

Sum of four consecutive odd numbers is 328. Find the largest number.

 

A) 85 B) 98
C) 79 D) 97
 
Answer & Explanation Answer: A) 85

Explanation:
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0 879
Q:

What is the smallest integer that is divisible by 3, 7 and 18?

 

A) 63 B) 252
C) 72 D) 126
 
Answer & Explanation Answer: D) 126

Explanation:
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0 1027
Q:

If the mean of the numbers 27 + x, 31 + x, 89 + x, 107 + x and 156 + x is 82.then the mean of 130 + x, 126 x, 68 + x, 50 + x 1 + x is :

 

A) 80 B) 75
C) 50 D) 70
 
Answer & Explanation Answer: B) 75

Explanation:
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0 286
Q:

Arrange the following in the decreasing order?

 

(√23 – √21), (√19 – √17), (√21 – √19)

 

A) (√23 – √21) > (√21 – √19) > (√19 – √17)   B) (√23 – √21) > (√19 – √17) > (√21 – √19)  
C) (√19 – √17) > (√21 – √19) > (√23 – √21)   D) (√21 – √19) > (√23 – √21) > (√19 – √17)
 
Answer & Explanation Answer: C) (√19 – √17) > (√21 – √19) > (√23 – √21)  

Explanation:
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0 805