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

Every recurring decimal represents

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

What is the conjugate of -7 -2i?

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

Every real number is

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

There is no element common in

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

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

• a,a = a² A
• a,a = 1 B
• a,a = 0 C
• None of these D

• Associative property of addition A
• Commutative property of addition B
• Distributive property C
• Additive identity 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 rational number A
• An irrational number B
• An odd number C
• A prime number D

Name the property used in 100 + 0 = 100

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

i¹⁰¹ =

• i A
• i² B
• -i C
• -1 D

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

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

i^-(4n+2) = -------------------------------

• 1 A
• i B
• -1 C
• -i D

If z = (x,y) , then  z ̅  =

• (-x,y) A
• (x,-y) B
• (-x, -y) C
• None of these D

• Reflexive property A
• Symmetric property B
• Cancellations property w.r.t. addition C
• Transitive property D

(a+bi) - (c+di)=

• (a+b) = (c+d) A
• (a+c) + i(b+d) B
• (a - c) + (c- d)i C
• (a - c)+ (b - d)i D

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

• 
  A
• 
  B
• 
  C
• 
  D

The value of x, and y, when (x + iy)²= 5 + 4i

• X = 2, y = -1 A
• X = -2, y=1 B
• X = 2, y = -1 C
• X = 2, y = 2 D

Decimal part of irrational number is

• Terminating A
• Repeating only B
• Neither repeating nor terminating C
• Repeating and terminating D

Total number of subsets that can be formed out of the set {a,b,c} is

• 1 A
• 4 B
• 8 C
• 12 D

1/3 is ______

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

O is ______

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

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

The additive identity of real number is

• 1 A
• 2 B
• 1/2 C
• 0 D

The multiplicative inverse of 1 - 2i is

• 
  A
• 
  B
• 
  C
• 
  D

(a-1)-1 =

• a-1 A
• a B
• -a C
• None of above D

• (a + b)c = a . c + bc A
• a + b = b + a B
• (a + b) + c = a + (b + c) C
• a(b+ c) = ab + ac D

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

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

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