# NDA (National Defense Academy) Mathematics: Questions 72 - 82 of 384

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## Question number: 72

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MCQ▾

### Question

What is the sum of the squares of direction cosines of the line joining the points ?

### Choices

Choice (4)Response

a.

b.

1

c.

0

d.

## Question number: 73

» Algebra » Complex Numbers » Modulus

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MCQ▾

### Question

If , then what is the imaginary part of equal to?

### Choices

Choice (4)Response

a.

1

b.

0

c.

d.

## Question number: 74

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Appeared in Year: 2012

MCQ▾

### Question

If and then what isequal to?

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 75

Edit
MCQ▾

### Question

The angle of elevation of a tower at a level ground is . The angle of elevation becomes . when moved towards the tower. If the height of tower is , then what is equal to?

### Choices

Choice (4)Response

a.

b.

c.

d.

Question does not provide sufficient data or is vague

## Question number: 76

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MCQ▾

### Question

What is equal to? Where,

### Choices

Choice (4)Response

a.

1

b.

1.73

c.

2.32

d.

1.74

## Question number: 77

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MCQ▾

### Question

If then what is equal to?

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 78

Edit
MCQ▾

### Question

and then what isequal to

### Choices

Choice (4)Response

a.

b.

c.

1/y

d.

## Question number: 79

Edit

Appeared in Year: 2012

MCQ▾

### Question

What is the value of ?

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 80

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Appeared in Year: 2012

MCQ▾

### Question

If four dice are thrown together, then what is the probability that the sum of the number appearing one them is 25?

### Choices

Choice (4)Response

a.

1

b.

1/2

c.

1/1296

d.

0

## Question number: 81

Edit

Appeared in Year: 2012

MCQ▾

### Question

If then what is the value of ?

### Choices

Choice (4)Response

a.

2

b.

0

c.

1

d.

## Question number: 82

Edit
MCQ▾

### Question

What is the decimal number representation of the binary number ?

### Choices

Choice (4)Response

a.

25.025

b.

13.625

c.

d.

212.125

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