ECAT Pre Engineering Mathematic MCQ Test With Answer for Chapter 1 (Number System)

(a-1)-1 =

• a-1 A
• a B
• -a C
• None of above D

Associative law of multiplication

• ab = ba A
• a(bc) = (ab) c B
• a(b+c) = ab + ac C
• (a + b)c = ac + bc D

Name the property used in 1000 x 1 = 1000

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

i =

• √1 A
• √2 B
• √-2 C
• √-1 D

4/√49 is a

• Irrational Number A
• Prime Number B
• Rational number C
• Whole number D

√25 is a number

• Rational A
• Irrational B
• Natural C
• Odd D

In (x + iy), y is called as

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

The square root of every incomplete square is an

• Rational numbers A
• Even numbers B
• odd numbers C
• Irrational numbers D

(a, b) + (-a, -b) =

• (0,0) A
• (a, b) B
• (-a, -b) C
• (1, 1) 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

√11 is

• an irrational number A
• Rational number B
• odd number C
• Negative number D

• 1 A
• -1 B
• 
  C
• 
  D

QUQ, =

• N A
• R B
• W C
• Z D

The square root of 2i - 20i is

• +-(5 - 2i) A
• +-(5 + 2i) B
• (5 - 2i) C
• None of these D

In R the left cancellation property w.r.t addition is

• 
  A
• 
  B
• 
  C
• 
  D

π is the ration of

• Area of a circle to its diameter A
• Area of a circle to its radius B
• Circumference of a circle to its diameter C
• Circumference of circle to its radius D

The order axioms are satisfied by set of

• C A
• C and R B
• R C
• None of these D

What is the conjugate of -7 -2i ?

• -7 + 2i A
• 7 +2i B
• 7 -2i C
• √53 D

3/2 is

• An irrational number A
• Whole number B
• A positive integer C
• A rational number D

∀x, y ∈ R, either x = y or x > y or x < y is

• Transitive property A
• Reflexive property B
• Trichotomy property C
• None of these D

The negative square root of 9 can be written as:

• -√9 A
• √9 B
• √18 C
• -√18 D

• 0 A
• 1 B
• -1 C
• None of these D

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

202.04 is an example of

• Recurring decimals A
• Non-recurring decimals B
• Terminating decimals C
• None of these D

The identity element with respect to subtraction is

• 0 A
• 1 B
• -1 C
• Does not exist D

Any recurring decimal represents a

• Irrational no A
• Integer B
• Rational no C
• None of these D

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

• Additive property A
• Transitive property B
• Trichotomy property of inequality C

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

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

• (a + b)c = ac + bc A
• a + b = b + a B
• (a + b) + c = a + (b + c) C
• a(b +c) = ab + ac D

Any whole number can be written as a product of factors which are

• Odd numbers A
• Prime number B
• Rational number C
• Even number D