# Mental Ability-Basic Arithmetic (NCO- Cyber Olympiad Class 7): Questions 45 - 51 of 122

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## Question number: 45

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

A cistern can be filled by two tapes A and B in 3 hours and 2 hours respectively. How much time will the cistern be filled up completely?

### Choices

Choice (4) Response

a.

3.07 hours

b.

2.4 hours

c.

1.2 hours

d.

3.6 hours

## Question number: 46

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

A boat covers a certain distance downstream in 1 hour, while it comes back in 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.

12 kmps

b.

15 kmps

c.

14 kmps

d.

13 kmps

## Question number: 47

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

If each side of a cube is doubled, its volume

### Choices

Choice (4) Response

a.

Becomes 6 times

b.

Becomes 8 times

c.

Becomes 4 times

d.

Is doubled

## Question number: 48

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

In an election, two candidates contested. A candidate secured 30 % of the valid votes and is elected by a majority of 150 votes. Find the total number of valid votes.

### Choices

Choice (4) Response

a.

375

b.

570

c.

400

d.

510

## Question number: 49

» Mental Ability » Basic Arithmetic

MCQ▾

Simplify:

### Choices

Choice (4) Response

a.

10

b.

20

c.

11

d.

21

## Question number: 50

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

An ore contain 9 % lead. How many kilograms of the ore are required to get 60 kg of lead?

### Choices

Choice (4) Response

a.

666.66 kg

b.

850.78 kg

c.

544 kg

d.

144.22 kg

## Question number: 51

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

Which is greatest in

### Choices

Choice (4) Response

a.

0.15

b.

c.

d.

None of the above

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