ECAT Pre Engineering MCQ Test With Answer for Chapter 1 Mathematics

Every irrational number is

• A real number A
• A prime number B
• A natural number C
• An integer D

0.25 is ______

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

The multiplicative inverse of -3i is

• 3i A
• -3i B
• -1/3i C
• 1/3 i D

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

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

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

What is the conjugate of -7 -2i?

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

a >b ⇒a +c >b +c is known as

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

3/4 is ______

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

i =

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

∀ a ε R ∃ o ε R such that a + v = 0 + a = a is property of

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

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

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

• real number A
• complex number B
• rational number C
• irrational number D

• 
  A
• 
  B
• 
  C
• None of these D

The multiplicative inverse of 1 - 2i is

• 
  A
• 
  B
• 
  C
• 
  D

The square root of 2i - 20i is

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

• -8 A
• 8 B
• 8i C
• 32 D

The symbol of irrational is

• W A
• N B
• Q C
• Q' D

Gooch crucible is made of :

• Brass. A
• Porcelain. B
• Bronze. C
• Gold. D

The identity element with respect to subtraction is

• 0 A
• -1 B
• 0 and 1 C
• None of thes D

Geometrically, the modulus of a complex number represents its distance from the

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

i² = 

• 1 A
• 2 B
• -1 C
• 0 D

The identity element with respect to subtraction is

• 0 A
• 1 B
• -1 C
• Does not exist D

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

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

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

The additive inverse of 0 is

• 1 A
• -1 B
• 0 C
• Does not exist D

Zero is

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

A non-terminating non_recurring decimal represents an

• Irrational no A
• Both a & c B
• Rational no C
• None of these D