Mathematics ECAT Pre Engineering Chapter 1 Number System Online Test

Name the property used in 4.1 + (-4.1) = 0

• Additive inverse A
• Multiplication inverse B
• Additive identity C
• Multiplication identity D

• 
  A
• 1 B
• 
  C
• -1 D

1/3 is ______

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

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

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

The set {1,2,3,4......} is called

• Set of natural numbers A
• Set of whole numbers B
• Set of rational number C
• Set of irrational numbers D

• 
  A
• 
  B
• 
  C
• 
  D

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

If Z = (1,2), then Z^-1 =?

• (0.2, 0.4) A
• (-0.2 ,0.4) B
• (0.2,-0.4) C
• (-0.2,-0.4) D

• 
  A
• 
  B
• 
  C
• 
  D

If P is a whole number greater than 1, which has only P and I are factors. Then P is called

• Wholw number A
• Prime number B
• Even number C
• Odd number D

24 can be written as a product of

• Odd factors A
• Even factors B
• Whole factors C
• Prime factors D

Every real number is

• A complex number A
• A rational number B
• A natural number C
• A prime number D

The identity element with respect to subtraction is

• 0 A
• 1 B
• -1 C
• Does not exist D

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

i³ =

• -1 A
• i B
• -i C
• 1 D

The symbol of irrational is

• W A
• N B
• Q C
• Q' D

√(-1b) =?

• b i A
• -i b B
• b2 C
• i√b D

Zero is

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

Every prime number is also

• Rational number A
• Even number B
• Irrational number C
• Multiple of two numbers D

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

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

The multiplicative inverse of 2/3 is

• 3/2 A
• -2/3 B
• -3/2 C
• 1 D

a >b, b >c ⇒a >c is a

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

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

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

The set {0,-1} hold closure property under

• Addition A
• Both a & c B
• Multiplication C
• None of these D

• 
  A
• 
  B
• 
  C
• 
  D

What is the conjugate of -7 -2i?

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