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

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

• 1 A
• 4 B
• 8 C
• 12 D

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

• z is purely imaginary A
• a is any complex number B
• z is real C
• None of these D

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

• √5 A
• √7 B
• -1-2i C
• √3 D

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

Name the property used in 1000 x 1 = 1000

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

The symbol of irrational is

• W A
• N B
• Q C
• Q' D

The additive inverse of 0 is

• 1 A
• -1 B
• 0 C
• Does not exist D

• 
  A
• 
  B
• 
  C
• 
  D

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

√25 is a number

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

In (x + iy), y is called as

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

√-1 b=

• b A
• 2 B
• 2b C
• None of these 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 = -i C
• x = 2, y = 2 D

In (x +iy) y is called as

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

In R the left cancellation property w.r.t addition is

• 
  A
• 
  B
• 
  C
• 
  D

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

202.04 is an example of

• Recurring decimals A
• Non-recurring decimals B
• Terminating decimals 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

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

In polar form of complex number r =

• 
  A
• 
  B
• 
  C
• 
  D

The set of rational number is represented by

• W A
• R B
• Q' C
• Q
  
  
  D

i³ =

• -1 A
• i B
• -i C
• 1 D

Every recurring decimal represents

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

If ∀a,b ε R,then a +b  ε  R is a property

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

There is no element common in

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

Gooch crucible is made of :

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

The conjugate of √5 i is

• √5 A
• -√5 i B
• i C
• 5i D

• N A
• r B
• 2r C
• π D