# Class 11 Maths Mcqs

Q:

A) additive inverse | B) additive identity element |

C) multiplicative identity element | D) multiplicative inverse |

Answer & Explanation
Answer: D) multiplicative inverse

Explanation: On multiplying reciprocal of complex number (1/z) to complex number z, we get multiplying inverse one i.e. z*1=z.

Explanation: On multiplying reciprocal of complex number (1/z) to complex number z, we get multiplying inverse one i.e. z*1=z.

76

Q:

A) additive inverse | B) additive identity element |

C) multiplicative identity element | D) multiplicative inverse |

Answer & Explanation
Answer: A) additive inverse

Explanation: On adding negative of complex number (-z) to complex number z, we get additive identity element zero i.e. z+(-z)=0.

Explanation: On adding negative of complex number (-z) to complex number z, we get additive identity element zero i.e. z+(-z)=0.

64

Q:

A) additive inverse | B) additive identity element |

C) multiplicative identity element | D) multiplicative inverse |

Answer & Explanation
Answer: C) multiplicative identity element

Explanation: On multiplying one (1+0i) to a complex number, we get same complex number so 1+0i is multiplicative identity element for complex number z i.e. z*1=z.

Explanation: On multiplying one (1+0i) to a complex number, we get same complex number so 1+0i is multiplicative identity element for complex number z i.e. z*1=z.

83

Q:

A) additive inverse | B) additive identity element |

C) multiplicative identity element | D) multiplicative inverse |

Answer & Explanation
Answer: B) additive identity element

Explanation: On adding zero (0+0i) to a complex number, we get same complex number so 0+0i is additive identity element for complex number z i.e. z+0 = z.

Explanation: On adding zero (0+0i) to a complex number, we get same complex number so 0+0i is additive identity element for complex number z i.e. z+0 = z.

94

Q:

A) x=8 and y=4 | B) x=2 and y=4 |

C) x=2 and y=0 | D) x=8 and y=0 |

Answer & Explanation
Answer: B) x=2 and y=4

Explanation: If two complex numbers are equal, then corresponding parts are equal i.e. real parts of both are equal and imaginary parts of both are equal.

x+3 = 5 and y-2 = 2

x = 5-3 and y = 2+2

x=2 and y=4.

Explanation: If two complex numbers are equal, then corresponding parts are equal i.e. real parts of both are equal and imaginary parts of both are equal.

x+3 = 5 and y-2 = 2

x = 5-3 and y = 2+2

x=2 and y=4.

92

Q:

A) 4 | B) i |

C) 1 | D) 4+i |

Answer & Explanation
Answer: C) 1

Explanation: In z=a+bi, a is real part and b is imaginary part.

So, in 4+i, imaginary part is 1.

Explanation: In z=a+bi, a is real part and b is imaginary part.

So, in 4+i, imaginary part is 1.

117

Q:

A) (k + 1)? | B) k4 + 5k³ + 9k² + 7k + 2 |

C) k4 + 6k³ + 9k² + 7k + 2 | D) k4 + 3k³ + 9k² + 6k + 2 |

Answer & Explanation
Answer: B) k4 + 5k³ + 9k² + 7k + 2

Explanation: Not available for this question

Explanation: Not available for this question

87

Q:

A) 3 | B) 5 |

C) 7 | D) 11 |

57