Mental AbilityNumber Games (NCO Cyber Olympiad (SOF) Class 8): Questions 1  9 of 30
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Question number: 1
» Mental Ability » Number Games
Question
The value of is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 2
» Mental Ability » Number Games » Number Analogies
Question
The sum of two numbers is 30 and the difference of their squares is 30. The difference of the numbers is
Choices
Choice (4)  Response  

a.  1 

b.  0 

c.  8 

d.  3 

Question number: 3
» Mental Ability » Number Games
Question
The value of is
Choices
Choice (4)  Response  

a.  79 

b.  350 

c.  343 

d.  2401 

Question number: 4
» Mental Ability » Number Games
Question
The value of is
Choices
Choice (4)  Response  

a.  6 

b. 


c.  27 

d.  3 

Question number: 5
» Mental Ability » Number Games » Number Analogies
Question
What least number must be subtracted from 136 to make it a perfect square?
Choices
Choice (4)  Response  

a.  15 

b.  8 

c.  21 

d.  7 

Question number: 6
» Mental Ability » Number Games » Number Analogies
Question
What least number must be added to 219 to make it a perfect square?
Choices
Choice (4)  Response  

a.  6 

b.  23 

c.  19 

d.  12 

Question number: 7
» Mental Ability » Number Games » Number Analogies
Question
The sum of two numbers is 45 and the difference of their squares is 45. The difference of the numbers is
Choices
Choice (4)  Response  

a.  6 

b.  0 

c.  9 

d.  1 

Question number: 8
» Mental Ability » Number Games
Question
The difference between the compound interest and the simple interest on a certain sum at 20 % per annum for 3 years is Rs. 428.50. Find the sum.
Choices
Choice (4)  Response  

a.  Rs. 

b.  Rs. 

c.  Rs. 

d.  836.92 Rs. 

Question number: 9
» Mental Ability » Number Games
Question
The denominator of a rational number is less than its numerator by 2. If 3 is added to the numerator and 2 is subtracted from its denominator, the new number becomes . Find the original number.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

