Mental AbilityNumber Games [NCO Cyber Olympiad (SOF) Class 8]: Questions 10  13 of 30
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Question number: 10
» Mental Ability » Number Games
Question
The difference between the compound interest and the simple interest on a certain sum at 10 % per annum for 2 years is Rs. 320. Find the sum.
Choices
Choice (4)  Response  

a.  32000 Rs.  
b.  16000 Rs.  
c.  3200 Rs.  
d.  6400 Rs. 
Question number: 11
» Mental Ability » Number Games
Question
The denominator of a rational number is greater than its numerator by 4. If 4 is subtracted from the numerator and 1 is added to its denominator, the new number becomes . Find the original number.
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 12
» Mental Ability » Number Games » Number Analogies
Question
What least number must be subtracted from 3970 to get a perfect square? Also, find the square root of the perfect square.
Choices
Choice (4)  Response  

a.  1,76  
b.  8,68  
c.  1,63  
d.  3,54 
Question number: 13
» Mental Ability » Number Games
Question
Statement 1: The cube of a number is that number raised to the power of 3.
Statement 2: The natural number n is a perfect cube if for some natural number m.
Statement 3: The cube of an even natural number is even.
Statement 4: The cube of an odd natural number is odd.
State whether the above statements are correct or incorrect?
Choices
Choice (4)  Response  

a.  Statements 1,2 and 3 are incorrect  
b.  Only statements 1 and 3 are correct  
c.  Statements 2,3 and 4 are incorrect  
d.  All statements are correct 