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

There is no element common in

• N and W A
• E and W B
• N and O C
• Q and Q' 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

∀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

Every real number is

• a positive integer A
• a rational number B
• a negative integer C
• a complex number D

What is the conjugate of -6 -i?

• -6 +i A
• 6+i B
• -6 -i C
• 6 -i D

• 
  A
• 
  B
• 
  C
• 
  D

The multiplicative inverse of (a,b) is

• 
  A
• 
  B
• 
  C
• 
  D

In R the number of identity element w.r.t '+' is

• One A
• Two B
• Three C
• Four D

The symbol of irrational is

• W A
• N B
• Q C
• Q' D

• 1 A
• -1 B
• 
  C
• 
  D

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

The additive inverse of 2/3 is

• 3/2 A
• -2/3 B
• -3/2 C
• 0 D

• 1 A
• 3 B
• 2-i C
• -1 D

2.333....is a

• Irrational no A
• Complex no B
• Rational no C
• None of these D

√(-1b) =?

• b i A
• -i b B
• b2 C
• i√b D

• 
  A
• 1 B
• -1 C
• 
  D

Additive inverse of - a - b is

• a A
• -a + b B
• a - b C
• a + b 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

What is the conjugate of -7 -2i?

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

∀x,y,z ∈ R and z 0,then

• x > y ⇒ xz > yz A
• x<y ⇒ xz < yz B
• x < y ⇒ xz > yz C
• None of these D

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

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

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

Every natural number is

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

(√3+√5)+√7 = √3 +(√5 +√7) property used in above is

• Commutative property of addition A
• Closure property of addition B
• Additive inverse C
• Associative property w.r.t to adition D

• x A
• 
  B
• y C
• 
  D

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

• Additive property of inequality A
• Commutative property B
• Additive inverse C
• Additive identity D

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

Name the property used in a (b-c) = ab - ac

• commutative property of multiplication A
• distributive property of multiplication B
• associative property of multiplication C
• multiplicative inverse D