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

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

• 
  A
• 
  B
• 
  C
• 
  D

If z₁ = 1 + 2i, z₂ = 3 + 4i then

• z₁ > z₂ A
• z₁ = z₂ B
• z₁ < z₂ C
• None of these D

• 0 A
• 1 B
• -1 C
• None of these D

In (x + iy), y is called as

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

√23 is

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

Geometrically the modulus of a complex number represents its distance from the

• Point (1,0) A
• Point (0,1) B
• Point (1,1) C
• Point (0,0) D

In R, the multiplicative identity is

• 0 A
• 1 B
• -1 C
• None D

√-1 b=

• b A
• 2 B
• 2b C
• None of these D

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

If Z = (1,2), then Z^-1 =?

• (0.2, 0.4) A
• (-0.2 ,0.4) B
• (0.2,-0.4) C
• (-0.2,-0.4) 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

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

• 1 A
• -1 B
• 
  C
• 
  D

The multiplicative inverse of 0 is

• 1 A
• -1 B
• 0 C
• Does not exist D

14 is not a

• Prime number A
• Whole number B
• Even number C
• Real number D

• 
  A
• 
  B
• 
  C
• 
  D

If P is a whole number greater than 1, which has only P and I are factors. Then P is called

• Wholw number A
• Prime number B
• Even number C
• Odd number D

(a^-1)^-1=

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

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

The identity element with respect to subtraction is

• 0 A
• 1 B
• -1 C
• Does not exist D

The set of natural no. is closed under

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

i³=

• -1 A
• i B
• -i C
• 1 D

What is the conjugate of -6 -i

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

i² =

• 1 A
• 2 B
• -1 C
• 0 D

The set {1, 2, 3, 4, ....} is called

• Set of Natural numbers A
• Set of whole numbers B
• Set of rational number C
• Set of irrational numbers D

In R, the additive inverse of a is

• 0 A
• 1 B
• -a C
• 1/a D

• 
  A
• 
  B
• 
  C
• 
  D

Which of the following sets has closure property w.r.t. addition

• { 0 } A
• { 1 } B
• { 0, -1} C
• { 1, -1} D

The value of i⁴ⁿ⁺¹

• 1 A
• -1 B
• i C
• i² D

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