# Mental Ability-Number Games [NCO- Cyber Olympiad (SOF) Class 8]: Questions 10 - 13 of 30

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## Question number: 10

» Mental Ability » Number Games

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MCQ▾

### 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

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MCQ▾

### 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

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### 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

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MCQ▾

### 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

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