Question # 1

If n is any positive integer then 3 + 6 + 9 + ....+ 3n = ______

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If the roots of x²+ ax + b = 0 are non-real, then for all real x, x²+ ax + b is

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Negative

Positive

Zero

Nothing can be said

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Scalar matrix

Identity matrix

Null matrix

Symmetric matrix

If the flag-staff 6 meters high placed on the top of a tower. Makes the shadow 2√3 m on the ground, then the angle of elevation of the sun is

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30^ο

35^ο

45^ο

60^ο

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¹⁰C₆

¹⁰C₅

¹⁰C₄

None

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0

-1

1

not defined

The modulus of a vector i-i+ k is:

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√3

1

√2

∞

√2 +√3 +√5) = (√2 +√3 +√5: this property is called

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associative property w.r.t addition

commutative property

Closure property w.r.t addition

Additive identity

If cosα= 4/5, then cosα/2

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1

12

5

29

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Mathematics General Science Test Medium Mode MCQs With Answers

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