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

Some of two real numbers is also a real number , this property is called:

• Commutative property w.r.t addition A
• Closure property w.r.t. addition B
• Associative property w.r.t. addition C
• Distributive property w.r.t addition D

√(-1b) =?

• b i A
• -i b B
• b2 C
• i√b D

• 
  A
• 
  B
• 
  C
• 
  D

• 
  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

The multiplicative inverse of -3i is

• 3i A
• -3i B
• -1/3i C
• 1/3 i 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

• Additive property in R A
• Multiplication property in R B
• Cancellation property in R C
• Distribution property in R D

a.a^-1 = a^-1.a = 1 is a

• Commutative law of multiplication A
• Multiplicative identity B
• Associative law of multiplication C
• Multiplicative inverse D

√23 is

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

3/4 is ______

• An odd number A
• An even number B
• A natural number C
• A rational number D

∀x,y∈ R and x < 0, y < 0, which one is true 

• xy < o A
• xy = o B
• xy > o C
• None of these D

The square root of 2i - 20i is

• ±(5 - 2i) A
• ±(5+ 2i) B
• (5 - 2i) C
• None of these D

The multiplicative inverse of 2/3 is

• 3/2 A
• -2/3 B
• -3/2 C
• 1 D

The√ is used for the

• Positive square root A
• Negative square root B
• +ve and -ve square root C
• Whole number D

The set of rational number is represented by

• W A
• R B
• Q' C
• Q
  
  
  D

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• None of these D

In R, the multiplicative identity is

• 0 A
• 1 B
• -1 C
• None 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

• 15 A
• 15 i B
• -15 i C
• -15 D

Zero is

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

√11 is

• an irrational number A
• Rational number B
• odd number C
• Negative number D

The square roots of negative numbers is called

• Real no A
• Complex no B
• Positive no C
• Negative no D

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

Multiplicative inverse of "1" is

• 0 A
• ±1 B
• 1 C
• {0,1} D

In R the right cancellation property w.r.t. addition is

• 
  A
• 
  B
• 
  C
• 
  D

Every natural number is

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

• x A
• 
  B
• y C
• 
  D