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NCERT Mathematics Class 10 Exemplar Ch 5 Arithmetic Progressions Part 1

EXERCISE 5.1

1. In an AP, if , then a is

(A) 6

(B) 7

(C) 20

(D) 28

Answer: D

2. In an AP, if , , , then a will be

(A) 0

(B) 3.5

(C) 103.5

(D) 104.5

Answer: B

3. The list of numbers … is

(A) an AP with

(B) an AP with d = 4

(C) an AP with

(D) not an AP

Answer: B

4. The 11th term of the AP: , … is

(A) – 20

(B) 20

(C) – 30

(D) 30

Answer: B

5. The first four terms of an AP, whose first term is – 2 and the common difference is – 2, are

(A)

(B)

(C)

(D)

Answer: C

6. The 21st term of the AP whose first two terms are – 3 and 4 is

(A) 17

(B) 137

(C) 143

(D) – 143

Answer: B

7. If the 2nd term of an AP is 13 and the 5th term is 25, what is its 7th term?

(A) 30

(B) 33

(C) 37

(D) 38

Answer: B

8. Which term of the … is 210?

(A) 9th

(B) 10th

(C) 11th

(D) 12th

Answer: B

9. If the common difference of an AP is 5, then what is ?

(A) 5

(B) 20

(C) 25

(D) 30

Answer: C

10. What is the common difference of an AP in which ?

(A) 8

(B) – 8

(C) – 4

(D) 4

Answer: A