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

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

• 
  A
• 
  B
• 
  C
• 
  D

In R, the multiplicative inverse of a is

• 0 A
• 1 B
• -a C
• 1/a D

Zero is

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

There is no element common in

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

∀a,b,c∈R, a >b ∧ b>c ⇒ a >c is

• Trichotomy property A
• Transitive property B
• Symmetric property C
• Additive property D

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

If in a set of real no a is additive identity then

• a+a = 2a A
• a+a = 1 B
• a+a = 0 C
• None of these D

The set of natural no. is closed under

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

√25 is a number

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

14 is not a

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

i is equal

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

In (x + iy), y is called as

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

The symbol of irrational is

• W A
• N B
• Q C
• Q' D

Q∪ Q' =

• Q A
• Q' B
• N C
• R D

i¹⁰¹=

• i A
• i² B
• -i C
• -1 D

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

• 
  
  
  A
• 
  B
• 
  C
• 
  D

i⁹ =

• i² A
• -1 B
• 1 C
• i D

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

• 
  A
• 
  B
• 
  C
• 
  D

The product of complex numbers (a,b) and (c,d) is

• (ac, bd) A
• (ac-bd, ad+bc) B
• (ab,cd) C
• (ac+bd,ad-bc) D

• Associative property of addition A
• Associative property of multiplication B
• Commutative property of addition C
• Commutative property of multiplication D

• 
  A
• 
  B
• 
  C
• 
  D

1/3 is ______

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

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

• 
  A
• 
  B
• 
  C

• 
  A
• 
  B
• 
  C
• None of these D

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