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

H1, H2, H3, .... Hnare called n harmonic means between a and b if a, H1, H2, H3, ... Hnb are in

Question # 2

Let a1, a2, a3, a4and a5be such that a1, a2, and a3are in A.P., a2, a3and a4are in G.P and a3, a4and a5are in H.P. Then, a1, a3and a5are in

Question # 3

The formula an = arn-1represents

Question # 4

The sum of n terms of a series is denoted by

Question # 5

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

Question # 6

The sum of the squares of three distinct real numbers, which are in G.P., is S2. if their sum isαS then

Question # 7

The formula an = a +(n-1)d for an A.P is called

Question # 8

A sequence of number whose reciprocals form an arithmetic sequence is called

Question # 9

If x,y are two -ve distinct numbers then

Question # 10

If a1, r and anare the first term, common ratio and the nth term respectively of a G. P. then an=

Question # 11

A sequence having no last term is called

Question # 12

The next term of the sequence 1, 2, 4, 7, 11, ..... is.

Question # 13

The seventh term of an A.P whose first term is P and common difference is q. is

Question # 14

A function whose domain is a subset of natural numbers is called ______

Question # 15

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

Question # 16

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

Question # 17

The n numbers A1,A2,A3,.....Anare called an arithmetic means between a and b if a.A1,A2,A3.....An, b is ______

Question # 18

If a1= 3, r = 2, then the nth term of the G.P. is

Question # 19

The third term of a G.P. is the square of first term. If the second term is 8, then the 6th term is

Question # 20

99th term of the series 2 + 7 + 14 + 23 + 34 + ..... is

Question # 21

The sum of all 2 digit number is

Question # 22

A number H is said to be the H.M. between a and b if a, H, b are in

Question # 23

If Sn is a definite number as n → ∞,then the geometric series is

Question # 24

The numbers of G1, G2, G3...... Gnare called n geometric means between a and b is a, G1, G2,G3, ... Gn, b are in

Question # 25

A Geometric Series is divergent only if

Question # 26

The difference of two consecutive terms of an A.P is called the

Question # 27

1 + 2 + 3 + ...... + n = ______

Question # 28

If A, G, H are the arithmetic, geometric and harmonic means between a and b respectively then A, G, H are in

Question # 29

Every term of a G.P. is positive and also every term is the sum of two preceding terms. Then the common ratio of the G.P. is

Question # 30

If A is such that a,A,B are in A.P then A is called

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ECAT Mathematics Chapter 8 Important MCQ's

Sr.# Question Answer
1 The number of divisors of 1029, 1547 and 122 are in
A. A.P.
B. G.P.
C. H.P.
D. None of these
2 A number H is said to be the H.M. between a and b if a, H, b are in
A. A.P.
B. G. P.
C. H. P.
D. None of these
3 H.M. between 3 and 7 is
4 99th term of the series 2 + 7 + 14 + 23 + 34 + ..... is
A. 9998
B. 9999
C. 10000
D. None of these
5 Three consecutive terms of a progression are 30, 24, 20. The next terms of the progression is
6 If A is such that a,A,B are in A.P then A is called
A. A.M
B. Common ratio
C. Common difference
D. None of these
7 Write the first four terms of the sequence if an= (-1)nn2
A. -1, 4, -9, 16
B. 1, -4, 9, 16
C. 1, 4, 9, 16
D. None of these
8 If the pth, qth, and rth terms of an A.P. are in G.P:., then the common ratio of the G.P. is
9 The fifth term of the sequence an= 2n + 3 is ______
A. 13
B. -13
C. 8
D. 3
10 The third term of a G.P. is the square of first term. If the second term is 8, then the 6th term is
A. 120
B. 124
C. 128
D. 132

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