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

The real number system contains.

• Positive Numbers A
• Negative numbers B
• Zero C
• (option a, b and c) D

3/4 is ______

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

What is the conjugate of -6 -i?

• -6 +i A
• 6+i B
• -6 -i C
• 6 -i D

Every prime number is also

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

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

Multiplicative inverse of "1" is

• 0 A
• ±1 B
• 1 C
• {0,1} D

In R, the multiplicative inverse of a is

• 0 A
• 1 B
• -a C
• 1/a D

√23 is

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

1.4142135... is ______

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

The additive inverse of 1 is

• 1 A
• -1 B
• 0 C
• Does not exist D

The multiplicative inverse of (a,b) is

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

• Additive property of inequality A
• Commutative property B
• Additive inverse C
• Additive identity D

The additive identity of real number is

• 1 A
• 2 B
• 1/2 C
• 0 D

1/3 is a decimal

• Recurring A
• Terminating B
• Non-terminating C
• None of the above D

The multiplicative inverse of 1 - 2i is

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

(a,b) +(-a,-b) =

• (0,0) A
• (a,b) B
• (-a,-b) C
• (1,1) D

• 
  A
• 
  B
• 
  C
• 
  D

The multiplicative inverse of 1 is

• 1 A
• -1 B
• 0 C
• Does not exist 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

(√3+√5)+√7 = √3 +(√5 +√7) property used in above is

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

• 
  A
• 
  B
• 
  C
• 
  D

√11 is

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

(7, 9) + (3, -5) =

• (4, 4) A
• (10, 4) B
• (9, -5) C
• (7, 3) D

• 
  A
• 
  B
• 
  C
• 
  D

• 1 A
• -1 B
• 
  C
• 
  D

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