# NCO- Cyber Olympiad (SOF) Class 8: Questions 136 - 139 of 510

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## Question number: 136

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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

## Question number: 137

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MCQ▾

### Question

The monthly salaries of A, B, C are in the proportion 5: 3: 8. If C’s monthly salary is Rs. 800 more than that of A, then B’s annual salary is

### Choices

Choice (4)Response

a.

Rs. 12000

b.

Rs. 4000

c.

Rs. 10200

d.

Rs. 9600

## Question number: 138

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### Question

A man goes to a place at the rate of 8 kmph. He comes back on a bicycle at 12 kmph. His average speed for the entire journey is:

### Choices

Choice (4)Response

a.

5.4 kmph

b.

10 kmph

c.

4.8 kmph

d.

5 kmph

## Question number: 139

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MCQ▾

### Question

In the following question, a paper of the given geometrical shape is folded and punched as shown. How will the paper look when unfolded? Select your answer from the answer figures given below.

### Choices

Choice (4)Response

a.

b.

c.

d.

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