ECAT Pre Engineering MCQ Test With Answer for Chapter 1 Mathematics

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  A
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  B
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  C
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  D

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  A
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  B
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  C
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  D

The sum of complex number (a,b) and (c,d) is

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  A
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  B
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  C
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  D

Every irrational number is

• A real number A
• A prime number B
• A natural number C
• An integer D

a.a^-1= a^-1.a = 1 is a

• Commutative law of multiplication A
• Multiplication identity B
• Associative law of multiplication C
• Multiplication inverse D

The value of x and y when (x + iy)2 = 5 - 4i

• x = 2, y = -1 A
• x = -2, y = 1 B
• x = 2, y = -i C
• x = 2, y = 2 D

• Closure law of addition A
• Closure law of multiplication B
• Commutative law of addition C
• Commutative law of multiplication D

The set of natural no. is closed under

• multiplication A
• subtraction B
• difference C
• division D

• additive property A
• multiplicative property B
• additive inverse C
• additive identity D

(a,0) x (c, 0) =

• (0,ac) A
• (ac, 0) B
• (0,0) C
• (a, c) D

If 4 > b or a < b than a = b is a

• Additive property A
• Transitive property B
• Trichotomy property of inequality C
• None of above D

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  A
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  B
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  C
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  D

If ∀a,b ε R,then a +b  ε  R is a property

• Closure law of addition A
• Associative law of addition B
• Additive inverse C
• Additive identity D

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  A
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  B
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  C
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  D

Every whole number is

• A real number A
• An irrational number B
• A prime number C
• A negative integer D

• Associative property of addition A
• Associative property of multiplication B
• Commutative property of addition C
• Commutative property of multiplication D

If z₁ = (a,b), z₂=(c,d), then z₁ z₂ = -------------------

• (ac,bd) A
• (ac+bd, ad-bc) B
• (ac-bd , ad+bc) C
• (ac-bd , ad-bc) D

The multiplicative inverse of 1 is

• 1 A
• -1 B
• 0 C
• Does not exist D

If z₁ =√-36 ,z₂ =√-25,z3 =√-16 then

• 15 A
• 15i B
• -15i C
• -15 D

In (x + iy), y is called as

• Imaginary part A
• Complex number B
• Real part C
• None of above D

It is not possible to find the exact value of

• π A
• √9 B
• ∛27 C
• √1 D

• additive property A
• multiplicative property B
• additive identity C
• multiplicative identity D

The additive inverse of 1 is

• 1 A
• -1 B
• 0 C
• Does not exist D

• N A
• r B
• 2r C
• π D

• 1 A
• -i B
• i C
• 0 D

If in a set of real no a is multiplicative identity then

• a,a = a² A
• a,a = 1 B
• a,a = 0 C
• None of these D

For any real numbers x,y,xy=o ⇒

• x ≠ 0 ∧ y ≠ 0 A
• x = 0 ∨ y = 0 B
• x = 0 C
• y = 0 D

∀a,b,c∈R and c>0,then

• a>b ⇒ ac < bc A
• a>b ⇒ ac > bc B
• a<b ⇒ ac > bc C
• None of these D

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  A
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  B
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  C
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  D

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  A
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  B
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  C
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  D