# Mental Ability (NCO- Cyber Olympiad (SOF) Class 6): Questions 138 - 144 of 394

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## Question number: 138

» Mental Ability » Basic Geometry

MCQ▾

### Question

In equivalent triangle ABC, D and E are the midpoints of AB and BC respectively. Which of the following is not true?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 139

» Mental Ability » Basic Algebra

MCQ▾

### Question

Given, the value of is ________.

### Choices

Choice (4) Response

a.

15

b.

75

c.

2

d.

12

## Question number: 140

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

By how much must 3 be increased so that it bears same ratio to 10 as 18 to 36?

### Choices

Choice (4) Response

a.

1

b.

4

c.

2

d.

3

## Question number: 141

» Mental Ability » Basic Arithmetic

MCQ▾

### Choices

Choice (4) Response

a.

2.7

b.

270

c.

0.27

d.

27

## Question number: 142

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

The subtraction of two irrational numbers________.

### Choices

Choice (4) Response

a.

May be rational in some cases and irrational in some other cases

b.

An integer

c.

Is always irrational

d.

Is always rational

## Question number: 143

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

By how much must 27 be decreased so that it bears same ratio to 49 as 12 to 28?

### Choices

Choice (4) Response

a.

3

b.

2

c.

6

d.

7

## Question number: 144

» Mental Ability » Basic Geometry

MCQ▾

### Question

In parallelogram ABCD, E and F are the midpoints of AB and CD respectively. Which of the following is not true?

### Choices

Choice (4) Response

a.

b.

ED is not parallel to BF

c.

AF trisects BD

d.

CE trisects BD