Mental AbilityBasic Arithmetic (NCO Cyber Olympiad Class 7): Questions 76  83 of 122
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Question number: 76
» Mental Ability » Basic Arithmetic
Question
If the area of a triangle with base z is equal to the volume of a cube with edge z, then the altitude of the triangle is
Choices
Choice (4)  Response  

a.  z 

b.  3z 

c. 


d. 


Question number: 77
» Mental Ability » Basic Arithmetic
Question
Two poles 14 m and 7 m high stand upright in a ground. If their feet are 24 m apart, find the distance between tops.
Choices
Choice (4)  Response  

a.  39 m 

b.  35 m 

c.  30 m 

d.  25 m 

Question number: 78
» Mental Ability » Basic Arithmetic
Question
If = 0.027, then will be ________
Choices
Choice (4)  Response  

a.  0.125 

b.  0.25 

c.  1 

d.  0.0625 

Question number: 79
» Mental Ability » Basic Arithmetic
Question
A train 800 meters long is running at a speed of . If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is.
Choices
Choice (4)  Response  

a.  540 

b.  500 

c.  360 

d.  130 

Question number: 80
» Mental Ability » Basic Arithmetic
Question
A boat covers a certain distance downstream in 2 hour, while it comes back in 1 hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?
Choices
Choice (4)  Response  

a.  15 kmps 

b.  8 kmps 

c.  11 kmps 

d.  13 kmps 

Question number: 81
» Mental Ability » Basic Arithmetic
Question
If each side of a square is doubled, its area
Choices
Choice (4)  Response  

a.  Becomes 8 times 

b.  Becomes 6 times 

c.  Becomes 4 times 

d.  Is doubled 

Question number: 82
» Mental Ability » Basic Arithmetic
Question
What percent of is ?
Choices
Choice (4)  Response  

a.  2.5% 

b.  25% 

c.  0.4% 

d.  6.6% 

Question number: 83
» Mental Ability » Basic Arithmetic
Question
The average age of 30 children in a class is 10 years. If the teacher’s age is included, the average age becomes 12 years. Find the teacher’s age.
Choices
Choice (4)  Response  

a.  42 

b.  72 

c.  35 

d.  45 
