# Mental Ability (NCO- Cyber Olympiad Class 7): Questions 166 - 172 of 205

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## Question number: 166

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

Two cubes have volumes in the ratio 1: 8. Then the ratio of their sides is

### Choices

Choice (4) Response

a.

1: 8

b.

1: 18

c.

1: 2

d.

1: 4

## Question number: 167

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

A man sold a radio for Rs. 1274 and gained 30%, the radio was bought for?

### Choices

Choice (4) Response

a.

850

b.

1790

c.

1850

d.

980

## Question number: 168

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

28 % of 450 is ________.

### Choices

Choice (4) Response

a.

140

b.

112

c.

126

d.

125

## Question number: 169

» Mental Ability » Basic Arithmetic

MCQ▾

### 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

MCQ▾

### 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

MCQ▾

### Question

Express 0.11 as a vulgar fraction.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 172

» Mental Ability » Basic Arithmetic

MCQ▾

### 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

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