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

Additive inverse of - a - b is

• a A
• -a + b B
• a - b C
• a + b D

• 
  
  
  A
• 
  B
• 
  C
• 
  D

If z₁ =√-36 ,z₂ =√-25,z3 =√-16 then

• 15 A
• 15i B
• -15i C
• -15 D

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

The additive identity of real number is

• 1 A
• 2 B
• 1/2 C
• 0 D

• 
  A
• 
  B
• 
  C
• 
  D

If z = (x,y) , then  z ̅  =

• (-x,y) A
• (x,-y) B
• (-x, -y) C
• None of these D

In R, the multiplicative inverse of a is

• 0 A
• 1 B
• -a C
• 1/a 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

• (x, y) A
• (kx, y) B
• (x, ky) C
• (kx, ky) D

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

Q∪ Q' =

• Q A
• Q' B
• N C
• R D

• A rational number A
• An irrational number B
• An odd number C
• A prime number 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

Which element is the additive inverse of (a,b) in Complex numbers

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

1/3 is a decimal

• Recurring A
• Terminating B
• Non-terminating C
• None of the above D

• Associative law of addition A
• Commutative law of addition B
• Additive identity C
• Closure law of addition 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 = -1 C
• X = 2, y = 2 D

1/3 is ______

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

QUQ, =

• N A
• R B
• W C
• Z D

• 15 A
• 15 i B
• -15 i C
• -15 D

What is the conjugate of -6 -i

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

In set builder notation the set {0,1,2,........100} can be written as

• {x / xε B ∧ x ≤ 100} A
• {x / x ∈ W ∧ x < 101} B
• {x / x ∈ Z ∧ x < 101} C
• The set of first 100 whole numbers 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

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

The multiplicative inverse of 1 is

• 1 A
• -1 B
• 0 C
• Does not exist D

In (x + iy) x is the known as

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

∀a,b, c ε R ac = bc ⇒ a = b, c ≠ 0 is a

• Symmetric property A
• Cancellation property w.r.t multiplication B
• Reflexive property C
• Transitive property D