Mental Ability (NCO Cyber Olympiad Class 7): Questions 168  174 of 205
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Question number: 168
» Mental Ability » Basic Arithmetic
Question
28 % of 450 is ________.
Choices
Choice (4)  Response  

a.  140 

b.  112 

c.  126 

d.  125 

Question number: 169
» Mental Ability » Basic Arithmetic
Question
Human blood WBC’s are expressed in terms of number of red blood cells per cubic mm. Express 9.9 million blood cells per cubic mm terms of scientific notation.
Choices
Choice (4)  Response  

a.  99 

b.  0.99 

c.  0.99 

d.  9.9 

Question number: 170
» Mental Ability » Basic Arithmetic
Question
The ratio of the number of boys and girls in a college is 4: 3. If the percentage increase in the number of boys and girls be 17 % and 22 % respectively, what will be the new ratio?
Choices
Choice (4)  Response  

a.  12: 21 

b.  5: 9 

c.  21: 22 

d.  34: 33 

Question number: 171
» Mental Ability » Basic Algebra
Question
Express 0.11 as a vulgar fraction.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 172
» Mental Ability » Basic Arithmetic
Question
A boat covers a certain distance downstream in 1 hour, while it comes back in 1 hours. If the speed of the stream be 2 kmph, what is the speed of the boat in still water?
Choices
Choice (4)  Response  

a.  11 kmps 

b.  15 kmps 

c.  5 kmps 

d.  8 kmps 

Question number: 173
» Mental Ability » Basic Geometry
Question
XYZ is an isosceles triangle with XY = 12 m and , then XZ ________?
Choices
Choice (4)  Response  

a.  12 m 

b.  6 m 

c.  3 m 

d.  11 m 

Question number: 174
» Mental Ability » Basic Arithmetic
Question
What percent of is ?
Choices
Choice (4)  Response  

a.  20% 

b.  25% 

c.  0.4% 

d.  2.5% 
