Mental AbilityNumber Games (NCO Cyber Olympiad (SOF) Class 8): Questions 10  14 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 

Question number: 14
» Mental Ability » Number Games » Number Series
Question
Match the following.
ListⅠ (Group I)  ListⅡ (Group II) 

(A) Fractions  (i) …. . etc. 
(B) Natural numbers  (ii) ……etc. 
(C) Integers  (iii) ……, 3, 2, 1,0, 1,2, 3, ……. etc. 
(D) Whole numbers  (iv) 1,2, 3,4, 5, …. . etc. 
(E) Rational Numbers  (v) 0,1, 2,3, 4,5, …. . etc. 
Choices
Choice (4)  Response  

 
a. 


b. 


c. 


d. 

