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Mathematics ECAT Pre Engineering Chapter 10 Mathematical Inductions Online Test MCQs With Answers
Question # 1
If n € N , then n(n+3) is always
Choose an answer
Multiple of 3
Multiple of 6
odd
even
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Question # 2
The proposition S(n) for any n∈ N is only true if k∈ N and
Choose an answer
S(k +1) is true
S(1) is true and S(k+1) is true whenever S (k) is true
S(k+1) is true whenever S (k) is true
S(k) is true
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Question # 3
For n€ N,2
n>2
> n is to only when
Choose an answer
n<2
n≤ 4
n≥ 4
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Question # 4
The coefficient of x
10
in the expansion (x
3
+3/x
2
)
10
is
Choose an answer
1700
17023
17027
17010
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Question # 5
Choose an answer
Even
Odd
Prime
None of these
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Question # 6
If the sum of co-efficient in the expansion of (a+b)
n
is 4096, then the greatest co-efficient in the expansion is
Choose an answer
1594
792
924
2924
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Question # 7
In the expansion of (a + x)
n
the sum of exponents of a and x in each term of the expansion is
Choose an answer
n + 1
n - 1
n
2n
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Question # 8
The term independent of x is the expansion (x
3
+1/x)
12
Choose an answer
295
495
395
722
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Question # 9
The coefficient of x
18
in (ax
4
-bx)
9
after expansion is
Choose an answer
84a
3
b
6
22a
3
b
6
27a
4
b
5
28a
3
b
6
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Question # 10
The first three terms in the expansion of (1 + x)
3
are
Choose an answer
1 + 3x +6x
2
1- 3x + 6x
2
\
-3 -3x -6x
2
1- 3x -6x
2
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Question # 11
For each natural number n, n (n+1) is
Choose an answer
an even
an odd
multiple of 3
Irrational
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Question # 12
The 7th term of (3
8
+ 6
4
x)
11/4
is
Choose an answer
-19217/3 x
6
189/2 6
4
x
2227/12 x
3
-19712/3 x
6
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Question # 13
If n is any positive integer then 2
n
> 2(n + 1) is true for all
Choose an answer
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Question # 14
If a statement S(n) is true for n = i where i is some natural number and the truth of S(n) for n = k > i implies the truth of S(n) for n = k +1 then S(n) is true for all positive integers
Choose an answer
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Question # 15
Number of terms in the expansion of (a+x)
n
is
Choose an answer
n - 1
n + 1
n + 2
n + 3
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Question # 16
The middle term of (x-y)
8
is
Choose an answer
25 x
4
y
4
70 x
4
y
4
120 x
4
y
4
97x
4
y
4
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Question # 17
For every positive integers n 1+5+9+....+ (4n - 3) is
Choose an answer
n(2n - 1)
(2n - 1)
n - 1
n
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Question # 18
Choose an answer
405 / 256
504 / 259
450 / 263
None
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Question # 19
If (1+x)
n
=C
0
+ C
1
x +C
2
x
2
+ ......+C
n
x
1
then C
0
C
2
+ C
1
C
3
+ C
2
C
4
+ .....+C
n-2
C
n
=
Choose an answer
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Question # 20
Choose an answer
28 / 81
28 / 243
81 / 28
243 / 82
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Question # 21
The term involving x4 the expansion (3-2x)7 is
Choose an answer
217 x4
15120x4
313x4
-25x4
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Question # 22
n
C
2
= exists when n is ______
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Question # 23
(2.02)4 s equal to
Choose an answer
16
16.6496
17
18
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Question # 24
The proposition S(n) is true∀n∈N,S(k+1) true when ______is true
Choose an answer
S(1)
Both a & c
S(k)
None
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Question # 25
If the 4th term in the expansion of (px + x
-1
)
m
is 2.5 for all x
∈ R, then
Choose an answer
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Question # 26
The sum of the odd coefficients in the expansion of (a + x)
4
is
Choose an answer
14
12
8
4
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Question # 27
The first three terms in the expansion of (1 + x)
-2
are ______
Choose an answer
1 - 2x + 3x
2
1 - 2x - 3x
2
1 + 2x + 3x
2
-2 -2x + 3x
2
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Question # 28
The positive integer just greater than (1+0.0001)
10000
is
Choose an answer
4
5
2
3
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Question # 29
Choose an answer
n < 8/5
n < 5/8
|n| < 8/5
|n|>8/5
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Question # 30
Choose an answer
10
C
6
10
C
5
10
C
4
None
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Question # 31
The sum of the even coefficients in the expansion (1 + x)
n
is
Choose an answer
n
2
2
n-2
2
n-1
2
n
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