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ECAT Pre General Science Mathematics Chapter 8 Sequences and Series Online Test MCQs With Answers
Question # 1
1/2,1/3,1/4,1/5.........is
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a geometric sec
an arithmetric series
finite sequence
an infinite sequece
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Question # 2
If the pth, qth, and rth terms of an A.P. are in G.P:., then the common ratio of the G.P. is
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Question # 3
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 # 4
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1
2
3/2
5/2
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Question # 5
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an A.P.
a G.P.
a H.P.
None of these
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Question # 6
H.M. between 3 and 7 is
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Question # 7
A sequence of number whose reciprocals form an arithmetic sequence is called
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Geometric sequence
Arithmetic series
Harmonic sequence
Harmonic series
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Question # 8
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Question # 9
The difference of two consecutive terms of an A.P is called the
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Common difference
Common ratio
Geometric series
Geometric mean
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Question # 10
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 # 11
Which term of the A.P 5,8,11,24.............is 320
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104th
106th
105th
64th
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Question # 12
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 # 13
If x,y are two positive distinct numbers then
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A>G>H
A<G<H
A=G=H
None of these
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Question # 14
The consecutive terms of a progressions are 30, 24, 20. The next term of the progression is
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Question # 15
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Question # 16
The 6th term of the sequence 7,9,12,16......is
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27
32
20
19
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Question # 17
Arithmetic mean between a and b is
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Question # 18
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Question # 19
A function whose domain is a subset of natural numbers is called ______
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Identity function
Sequence
Onto function
Series
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Question # 20
Arithmetic mean between x - 3 and x + 5 is
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x + 1
x + 2
x + 3
x + 4
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Question # 21
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2
-3/2
1
0
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Question # 22
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1/2
2
1/4
4
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Question # 23
The 10th common term between the series 3+7+11+....... and 1 + 6 +11 + ....... is
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191
193
211
None of these
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Question # 24
The number of divisors of 1029, 1547 and 122 are in
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A.P.
G.P.
H.P.
None of these
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Question # 25
The sum of all 2 digit number is
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4750
3776
4895
4905
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Question # 26
The 31 term of the A.P 5,2,-1.....is
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-82
82
85
-85
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Question # 27
The series obtained by adding the terms of a geometric sequence is called
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Infinite series
Arithmetic series
Geometric series
Harmonic series
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Question # 28
The5thand 13th terms of an A.P are 5 and-3 respectively The first term of the A.P is
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1
-15
9
2
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Question # 29
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 # 30
If b
1
, b
2
, b
3
, ... are in G.P. with first term unity and common ratio r, then the minimum value of b
1
- b
3
+ b
5
is equal to
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3/4
1/4
1
None of these
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Question # 31
If all members of a sequence are real numbers then it is called a
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Series
Function
Real sequence
Range
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