ECAT Pre Engineering MCQ Test With Answer for Chapter 8 Mathematics

MCQ's Test For ECAT Mathematics Chapter 8 Sequences and Series

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ECAT Mathematics Chapter 8 Sequences and Series

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Question # 1

The 31 term of the A.P 5,2,-1.....is

Question # 2

The number of divisors of 1029, 1547 and 122 are in

Question # 3

5th term of a G.P. is 2, then the product of first 9 terms is

Question # 4

If a, b, c are in AP., a, b, c are in G.P. then A, m2b, c are in

Question # 5

an -an-1,∀n∈N∧n>1 in an A.P is called

Question # 6

If all members of a sequence are real numbers then it is called a

Question # 7

The nth term of an A.P., is 12-4n. Its common difference is

Question # 8

An A.P., a G.P. and a H.P. have the same first and last terms and the same odd numbers of terms, the middle terms of the three series are in

Question # 9

1/2,1/3,1/4,1/5.........is

Question # 10

For an A.P common difference d

Question # 11

If the pth, qth, and rth terms of an A.P. are in G.P:., then the common ratio of the G.P. is

Question # 12

If a1= a2= 2, an= an-1- 1 (n > 2), then a5is

Question # 13

The nth term of a G.P. is

Question # 14

For an arithmetic series to be convergent it is necessary that the series has

Question # 15

An indicated sum of terms of a sequence is represented by

Question # 16

If P, Q, R be the A.M., G.M., H.M. respectively between any two rational numbers a and b, then P - Q is

Question # 17

If the domain of sequence is finite set then the sequence is called

Question # 18

The series obtained by adding the terms of a geometric sequence is called

Question # 19

If all members of a sequence are real numbers then it is called

Question # 20

Three consecutive terms of a progression are 30, 24, 20. The next terms of the progression is

Question # 21

Let the sequence 1, 2, 2, 4, 4, 4, 4, 8, 8, 8, 8, 8, 8, 8, 8, ..... where n consecutive terms have the value n, then 1025th term is

Question # 22

An infinite arithmetic series is always

Question # 23

The5thand 13th terms of an A.P are 5 and-3 respectively The first term of the A.P is

Question # 24

The 6th term of an arithmetic sequence whose first term is 3 and common difference in zero is

Question # 25

Which one represents a sequence

Question # 26

No term of a harmonic sequence can be

Question # 27

In following question, a number series is given with one term missing. choose the correct alternative that will same pattern and fill in the blank spaces.1 , 4, 9, 16, 25, x

Question # 28

What is the 26th term of the sequence, if its general term is an = (-1)n+1

Question # 29

Find the sum of the infinite geometric series 2 + 1 + 0.5 + ....

Question # 30

G is geometric mean between a and b if a, G, b is

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ECAT Mathematics Chapter 8 Important MCQ's

Sr.# Question Answer
1 Which term of the A.P 5,8,11,24.............is 320
A. 104th
B. 106th
C. 105th
D. 64th
2 If a1= 3, r = 2, then the nth term of the G.P. is
A. 2.3n-1
B. 3.2n
C. 3.2n+1
D. 3.2n-1
3 If 6th term of a series in A.P, is -2 and 8th term is -8, the first term of the serie is
A. 13
B. -13
C. 18
D. -10
4 An A.P. consists of n(odd terms) and its middle term is m. then the sum of the A.P. is
A. 2 mn
B. 1/2 mn
C. mn
D. mn2
5 The element range of sequence are called
A. Series
B. progression
C. Members
D. Terms
6 If #n = (n-5)2 + 5, then find #3 x #4.
A. 54
B. 12
C. 4
D. 9
7 The series obtained by adding the terms of a geometric sequence is called
A. Infinite series
B. Arithmetic series
C. Geometric series
D. Harmonic series
8 Which one represents a sequence
A. an
B. Sn
C. a(n)
D. {an}
9 How many numbers are there between 103 and 750 which are divisible by 6
A. 125
B. 107
C. 108
D. 113
10 Find the geometric mean between 4 and 16

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