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NAT I General Science Mathematics MCQs With Answers

Question # 1

If A and B are matrices such that AB=BA=I then

Choose an answer

A and B are multiplicative inverse of each other

A and B are additive inverses of each other

A and B are singular matrices

A and B are equal

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Question # 2

x-1/(x+2)(x-2) =

Choose an answer

4/3(x-4) -1/3(x-1)

3/4(x+2) + 1/4(x-2)

2/3(x-2) - 4/3(x+2)

3/x - 2/x+1

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Question # 3

The total cost of 2 apples and 3 oranges is $1.70,which of the following is true

Choose an answer

The cost of one apple

The cost of one orange

Both have equal cost per item

Cost of each single item can not be determined

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Question # 4

d/dx ∫x¹ dx =________.

Choose an answer

1/4 x⁴

X³

3x³

x⁴/4

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Question # 5

If sinθ = 1 then θ =

Choose an answer

2nπ +π/2

2nπ

2π +n

Nπ +π/2

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Question # 6

Two natural numbers whose sum is 25 and difference is 5, are

Choose an answer

25, 20

20, 10

20, 5

15, 10

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Question # 7

If α and β be irrational roots of a quadratic equation, then

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α = b/a and β = ca

α = a/b and β = -c/a

α² + β² = 1

α = -b/a and β= c/a

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Question # 8

If a cone is cut by a plane perpendicular to the axis of the cone then the section is a

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Parabola

Circle

Hyperbola

Ellipse

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Question # 9

There are 30 Red, 20 Green and some Blue bells in a bag if the probability of finding a Red ball is 1/3,how many are red balls in the bag

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120

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Question # 10

If i,m,n are the direction cosines of a vector O̅P̅ then

Choose an answer

I² + m² + n² =0

I² - m² + n² =1

I² + m² + n² =1

I² + m² - n² =0

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Question # 11

The value of Cos (1/2 Cos^-1 1/2) is equal to

Choose an answer

√3/2

-3/4

1/16

1/4

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