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Quiz 5
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Q.1
The sum of the first 16 terms of an AP whose first term and third term are 5 and 15 respectively is
600
765
640
680
690
Q.2
How many terms are there in the GP 5, 20, 80, 320........... 20480?
5
6
8
9
7
Q.3
If the first term of an A.P. is a and nth term is b, then its common difference is
$$\frac{{b - a}}{{n + 1}}$$
$$\frac{{b - a}}{{n - 1}}$$
$$\frac{{b - a}}{n}$$
$$\frac{{b + a}}{{n - 1}}$$
Q.4
If $$\frac{{5 + 9 + 13 + ...\,{\text{to}}\,n\,{\text{terms}}}}{{7 + 9 + 11 + ...\,{\text{to}}\,\left( {n + 1} \right)\,{\text{terms}}}}$$ $$ = \frac{{17}}{{16}},$$ then n = ?
8
7
10
11
Q.5
The next term of the A.P., $$\sqrt 7 ,$$ $$\sqrt {28} ,$$ $$\sqrt {63} ,$$ . . . . . .
$$\sqrt {70} ,$$
$$\sqrt {84} ,$$
$$\sqrt {97} ,$$
$$\sqrt {112} ,$$
Q.6
The first three terms of an A.P. respectively are 3y – 1, 3y + 5 and 5y + 1. Then, y equals
-3
4
5
2
Q.7
If 7
th
and 13
th
terms of an A.P. be 34 and 64 respectively, then its 18
th
term is
87
88
89
90
Q.8
The common difference of the A.P. is $$\frac{1}{{2q}},$$ $$\frac{{1 - 2q}}{{2q}},$$ $$\frac{{1 - 4q}}{{2q}},$$ . . . . is
-1
1
q
2q
Q.9
If the sum of it terms of an A.P. is 2n
2
+ 5n, then its nth term is
4n - 3
3n - 4
4n + 3
3n + 4
Q.10
If the sum of first n even natural number is equal to k times the sum of first n odd natural numbers, then k =
$$\frac{1}{n}$$
$$\frac{{n - 1}}{n}$$
$$\frac{{n + 1}}{{2n}}$$
$$\frac{{n + 1}}{n}$$
Q.11
In an AP, S
p
= q, S
q
= p and S denotes the sum of first r terms. Then, S
p+q
is equal to
0
– (p + q)
p + q
pq
0 h : 0 m : 1 s
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