ECAT Pre Engineering MCQ Test With Answer for Chapter 1 Mathematics

If A = {x / x ∈ R ∧ x² - 16 = 0} then A =

• - x A
• Infinite set B
• Φ C
• {-4,4} D

It is not possible to find the exact value of

• π A
• √9 B
• ∛27 C
• √1 D

If Z₁= 1 + i, Z₂= 2+3i, then |Z₂- Z₁| = ?

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

What is the conjugate of -7 -2i?

• -7 + 2i A
• 7 + 2i B
• 7 -2i C
• None of these D

The set { 1 , -1} is closed w.r.t.

• Addition A
• Multiplications B
• Subtraction C
• None of these D

If a and b are real numbers then a+b is also real number this law is called

• associative law of addition A
• closure law of addition B
• Distributive law of addition C
• Commutative law of addition D

• Principle of equality of fractions A
• Rule for product of fraction B
• Rule for quotient of fraction C

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

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

• Principle of equality of fractions A
• Rule for product of fractions B
• Golden rule for fractions C
• Rule for quotient of fractions D

The product of complex numbers (a,b) and (c,d) is

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

6 is

• A prime integar A
• An irrational number B
• A rational number C
• An odd integer D

• 1 A
• -i B
• i C
• 0 D

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

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

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

i¹⁰¹ =

• i A
• i² B
• -i C
• -1 D

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

• Reflexive property A
• Symmetric property B
• Transitive property C
• Additive property D

0.25 is ______

• An irrational number A
• A natural number B
• A prime number C
• A rational number D

√25 is a number

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

In R, the additive identity is

• 0 A
• 1 B
• -1 C
• None D

√x = ______ if is a prime number

• Rational no A
• Natural no B
• Irrational no C
• Complex no D

• Set of whole number A
• Rational Numbers B
• Complex numbers C
• Whole numbers D

I is not

• Real number A
• Natural number B
• Prime Number C
• Whole Number D

π is ______

• A complex number A
• A rational number B
• A natural number C
• An irrational number D

The multiplicative inverse of -3i is

• 3i A
• -3i B
• -1/3i C
• 1/3 i D

The√ is used for the

• Positive square root A
• Negative square root B
• +ve and -ve square root C
• Whole number D

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

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

• A rational number A
• A irrational number B
• An even integer C
• A factor of 36 D

∀x,y∈ R and x < 0, y < 0, which one is true 

• xy < o A
• xy = o B
• xy > o C
• None of these D