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ECAT Pre General Science Mathematics Chapter 8 Sequences and Series Online Test MCQs With Answers
Question # 1
Which one represents a sequence
Choose an answer
an
Sn
a(n)
{an}
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Question # 2
If a
x
= b
y
= c
z
and a, b, c are in G.P. then x, y, z are in
Choose an answer
A.P.
G.P.
H.P.
None of these
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Question # 3
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 # 4
1 + 2 + 3 + ...... + n = ______
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Question # 5
The 10th common term between the series 3+7+11+....... and 1 + 6 +11 + ....... is
Choose an answer
191
193
211
None of these
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Question # 6
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 # 7
The formula an = arn-1represents
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nth term of G.P
Sum of the first n terms
G.M between a and b
None of these
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Question # 8
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 # 9
The nth term of an A.P is (3n+5) Its 75th term is
Choose an answer
26
7
21
Cannot be determined
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Question # 10
The 7th term of the A.P 7,11,15,is
Choose an answer
24
31
26
23
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Question # 11
The sum of first 60 natural numbers is
Choose an answer
1830
3660
1640
1770
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Question # 12
If 5,7 and 9 are A.Ms between a and b, then a and b is equal to
Choose an answer
2 and 12
1 and 10
3 and 11
-7 and 2
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Question # 13
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Question # 14
The numbers of G
1
, G
2
, G
3
...... G
n
are called n geometric means between a and b is a, G
1
, G
2,
G
3
, ... G
n
, b are in
Choose an answer
H.P.
A.P.
G.P.
None of these
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Question # 15
If all members of a sequence are real numbers then it is called a
Choose an answer
Series
Function
Real sequence
Range
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Question # 16
The common ration of a geometric sequence cannot be
Choose an answer
0
1
2
3
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Question # 17
The element range of sequence are called
Choose an answer
Series
progression
Members
Terms
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Question # 18
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
Choose an answer
A.P.
G.P.
H.P.
None of these
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Question # 19
For an A.P common difference d
Choose an answer
Can be zero
May or may not zero
Cannot be zero
None of these
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Question # 20
A Geometric Series is divergent only if
Choose an answer
|r|>1
|r|≥1
|r|=1
None of these
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Question # 21
Arithmetic mean between x - 3 and x + 5 is
Choose an answer
x + 1
x + 2
x + 3
x + 4
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Question # 22
If the domain of sequence is finite set then the sequence is called
Choose an answer
geometric sequence
infinite sequence
finite sequence
arithmetic sequence
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Question # 23
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
Choose an answer
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 # 24
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
Choose an answer
2
9
2
10
2
11
2
8
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Question # 25
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Question # 26
A function whose domain is a subset of natural numbers is called ______
Choose an answer
Identity function
Sequence
Onto function
Series
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Question # 27
An indicated sum of terms of a sequence is represented by
Choose an answer
Sn
an
S(n)
{Sn}
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Question # 28
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
Choose an answer
35
36
48
49
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Question # 29
The5thand 13th terms of an A.P are 5 and-3 respectively The first term of the A.P is
Choose an answer
1
-15
9
2
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Question # 30
an -an-1,∀n∈N∧n>1 in an A.P is called
Choose an answer
Common difference
nth term
Common ratio
None of these
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Question # 31
A,G,H are in
Choose an answer
A.P
G.P
H.P
None of these
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