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

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

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

• Commutative law of multiplication A
• Closure law of multiplication B
• Associative law of multiplication C
• Multiplication identity D

The negative square root of 9 can be written as:

• -√9 A
• √9 B
• √18 C
• -√18 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

• 
  A
• 
  B
• 
  C
• 
  D

Multiplicative inverse of 0 is

• 0 A
• 1 B
• ±1 C
• Does not exist D

i² = 

• 1 A
• 2 B
• -1 C
• 0 D

2/9,5/7∈ R,(2│9)(5│7)=10/63∈R this property is called

• Associative property A
• Identity property B
• Commutative property C
• Closure property w.r.t multiplication D

• -3 -2i A
• 3 +2i B
• 1 + 2i C
• 1 - 2i D

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

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

Rational number is a number which can be written as a terminating decimal fraction or a

• Non-terminating decimal fraction A
• Non-recurring B
• Recurring decimal fraction C
• a, b and c D

The identity element with respect to subtraction is

• 0 A
• 1 B
• -1 C
• Does not exist D

QUQ, =

• N A
• R B
• W C
• Z D

I is not

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

Every recurring decimal represents

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

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

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

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

a >b, b >c ⇒a >c is a

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

(a^-1)^-1=

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

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

• √3 i A
• √7 B
• -2-i C
• √5 D

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

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

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

The set of rational number is represented by

• W A
• R B
• Q' C
• Q
  
  
  D

3.5+5.4=5.4+3.5 =8.9 this property of addition is called

• additive identity A
• assoclative property B
• commulative property C
• closure property D

i⁹ =

• i² A
• -1 B
• 1 C
• i D

• 
  A
• 
  B
• 
  C
• 
  D

A subset of set of complex number whose elements are of the form (a,0) is called

• Real number A
• Complex number B
• Rational number C
• Irrational number D

• 
  A
• 
  B
• 
  C
• 
  D