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

Question # 2

an -an-1,∀n∈N∧n>1 in an A.P is called

Question # 3

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

Question # 4

-2, 1, 4, 7,.... is ______

Question # 5

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

Question # 6

Find the geometric mean between 4 and 16

Question # 7

If a, b, c are in A.P., then 3a, 3b, 3care in

Question # 8

The 6th term of the sequence 7,9,12,16......is

Question # 9

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

Question # 10

The 7th term of the A.P 7,11,15,is

Question # 11

p, q, r and s are integers. If the A.M. of the roots of x2- px + q2= 0 and G.M. of the roots of x2- rx + s2= 0 are equal, then

Question # 12

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

Question # 13

Arithmetic mean between a and b is

Question # 14

If 6th term of a series in A.P, is -2 and 8th term is -8, the first term of the serie is

Question # 15

The sum of infinite numbers of terms of an arithmetic series is

Question # 16

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

Question # 17

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

Question # 18

A number A is called the arithmetic mean between a and b if a, A, b is ______

Question # 19

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

Question # 20

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

Question # 21

Write the first four terms of the sequence if an= (-1)nn2

Question # 22

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

Question # 23

If b1, b2, b3, ... are in G.P. with first term unity and common ratio r, then the minimum value of b1- b3+ b5is equal to

Question # 24

An infinite arithmetic series is always

Question # 25

The sum of first twenty odd integers in A.P is

Question # 26

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

Question # 27

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

Question # 28

A number A is said to be the A.M between the two numbers a and b if a, A, b 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

For three consecutive terms in A.P middle term is called

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ECAT Mathematics Chapter 8 Important MCQ's

Sr.# Question Answer
1 For an A.P common difference d
A. Can be zero
B. May or may not zero
C. Cannot be zero
D. None of these
2 -2, 1, 4, 7,.... is ______
A. Harmonic sequence
B. Arithmetic sequence
C. Geometric sequence
D. Arithmetic series
3 What is the 26th term of the sequence, if its general term is an = (-1)n+1
A. 2
B. 26
C. 27
D. 1
4 The nth term of a G.P. is
A. a1rn
B. a1rn+1
C. a1rn-1
D. a1r-n
5 Find the geometric mean between 4 and 16
6 The 6th term of the sequence 7,9,12,16......is
A. 27
B. 32
C. 20
D. 19
7 The element range of sequence are called
A. Series
B. progression
C. Members
D. Terms
8 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
9
Question Image
A. 15/23
B. 7/15
C. 7/8
D. 15/7
10 The sum of first 60 natural numbers is
A. 1830
B. 3660
C. 1640
D. 1770

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