# 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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MCQ▾

### 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. Image of Three Looks of a Paper Having Square Shapes Representing the image of folded paper having square shapes

### Choices

Choice (4) Response

a. Figure of Possible Unfolded Question Figure: Choice A Representing the image of possible unfolded question figure

b. Figure of Possible Unfolded Question Figure: Choice B Representing the image of possible unfolded question figure

c. Figure of Possible Unfolded Question Figure: Choice C Representing the image of possible unfolded question figure

d. Figure of Possible Unfolded Question Figure: Choice D Representing the image of possible unfolded question figure