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Mathematics ECAT Pre Engineering Chapter 8 Sequences and Series Online Test MCQs With Answers
Question # 1
The 7th term of the A.P 7,11,15,is
Choose an answer
24
31
26
23
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Question # 2
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
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q is an odd integer
r is an even integer
p is an even integer
s is an odd integer
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Question # 3
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an A.P.
a G.P.
a H.P.
None of these
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Question # 4
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Question # 5
If p, q, r and in A.P., a is G.M. between p and q and b is G.M. between q and r, then a
2
, q
2
, b
2
are in
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A.P.
G.P.
H.P.
None of these
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Question # 6
If a, b, c, d, e, f are in A.P.,then e-c is equal to
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2(c - a)
2(f - d)
2(d - c)
d - c
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Question # 7
The sum of n terms of a series is denoted by
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d
n
S
n
a
n
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Question # 8
The nth term of an A.P is (3n+5) Its 75th term is
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26
7
21
Cannot be determined
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Question # 9
If a
n
= 2n -3, write the first four terms
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-3, -1, 1, 3
1, 3, 5, 7
-1, 1, 3, 5
None of these
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Question # 10
The nth term of a G.P. is
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a
1
r
n
a
1
r
n+1
a
1
r
n-1
a
1
r
-n
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Question # 11
The third term of the sequence a
n
= (-1)
n-1
(n-7) is ______
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8
4
-4
8
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Question # 12
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Question # 13
If a
1
, r and a
n
are the first term, common ratio and the nth term respectively of a G. P. then a
n
=
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a
1
r
n
a
1
r
n-1
a
1
r
n+1
a
1
r
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Question # 14
Find the next two terms of 7, 9, 12, 16,...
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18, 20
19, 22
20, 25
21, 27
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Question # 15
Sequence also called..............
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Series
Function
progressions
Elements
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Question # 16
How many numbers are there between 103 and 750 which are divisible by 6
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125
107
108
113
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Question # 17
If G is a G.M between a and b then a,G,b are in
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A.P
H.P
G.P
None of these
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Question # 18
If a, b, c are in AP., a, b, c are in G.P. then A, m
2
b, c are in
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A.P.
G.P.
H.P.
None of these
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Question # 19
Write the first four terms of the arithmetic sequence 5, 2, -1, ... is
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3
-4
7
1
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Question # 20
If 6th term of a series in A.P, is -2 and 8th term is -8, the first term of the serie is
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13
-13
18
-10
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Question # 21
A Series which does not coverage to a Unique sum is called
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Harmonic Series
Oscillatroy Series
Arithmetic Series
None of these
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Question # 22
In an A.P,a +(n-a)d is
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1st term
General term
Last term
None of these
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Question # 23
Find the geometric mean between 4 and 16
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Question # 24
A,G,H are in
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A.P
G.P
H.P
None of these
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Question # 25
The sum of an indicated number of terms in a sequence is called
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sequence
progression
Series
Mean
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Question # 26
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Question # 27
an - an-1 will be common difference in an A.P if
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n = 1∀n∈ N
n>1∧n∈N
n∈Z
None of the above
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Question # 28
If all members of a sequence are real numbers then it is called
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A.P
Real Sequence
G.P
None of these
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Question # 29
Which one represents a sequence
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an
Sn
a(n)
{an}
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Question # 30
Find the sum of the infinite geometric series 2 + 1 + 0.5 + ....
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3.5
3
4
None of these
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Question # 31
If a
1
and r are the first term and the common ratio respectively then (n + 1)th term of the G.P. is
Choose an answer
0
a
1
r
n-1
a
1
r
n+1
a
1
r
n
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