ECAT Pre General Science MCQ Test With Answer for Mathematics Chapter 1

The multiplicative inverse of 1 is

• 1 A
• -1 B
• 0 C
• Does not exist D

Zero is

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

The equation |x +4| = x has solution

• x = -2 A
• x = 2 B
• x = -4 C
• x = 4 D

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

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

Every prime number is also

• Rational number A
• Even number B
• Irrational number C
• Multiple of two numbers D

• A prime number A
• An integer B
• A whole number C
• An irrational number D

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

What is the conjugate of -6 -i

• -6 +i A
• 6 + i B
• -6 -i C
• 6 -i D

√-1 b=

• b A
• 2 B
• 2b C
• None of these D

• 
  A
• 
  B
• 
  C
• 
  D

√2 is a number

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

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

In (x + iy), y is called as

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

i =

• 
  A
• 
  B
• 
  C
• 
  D

The polar form of complex number x ≠ I y =

• r cos θ+ r sin θ A
• r cos θ+ is sin θ B
• cos θ+ r sin θ C
• i cos θ+ i sin θ D

∀a,b, c ε R,a +c = b + c = > a = b

• Reflexive property A
• Symmetric property B
• Cancellations property w.r.t. addition C
• Transitive property D

The additive identity of real number is

• 1 A
• 2 B
• 1/2 C
• 0 D

• A positive integer A
• A negative integer B
• A natural number C
• An irrational number D

The square root of 2i - 20i is

• +-(5 - 2i) A
• +-(5 + 2i) B
• (5 - 2i) 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

The set of positive integers, 0 and negative integers is known as the set of

• Natural numbers A
• Rational numbers B
• All integers C
• Irrational numbers D

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

• √5 A
• √7 B
• -1-2i C
• √3 D

• 15 A
• 15 i B
• -15 i C
• -15 D

Such fraction which can not be written in the form ofp⁄q where p,q and q≠ 0,such fractions are called.

• Fractinal numbers A
• Rational Numbers B
• Even Numbers C
• Whole Numbers D

In R, the additive inverse of a is

• 0 A
• 1 B
• -a C
• 1/a D

If a is any real number and a = a is called

• symmetric property A
• Trichotomy Properties B
• Transitive Property C
• Reflexive Properties D

The multiplicative inverse ofx^(-1) is

• x A
• a-2 B
• 0 C
• 1 D

0 (zero) is

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

The additive inverse of 1 is

• 1 A
• -1 B
• 0 C
• Does not exist D