CBSE Class 10 Arithmetic Progressions MCQs – nth Term Formula and Applications
CBSE Class 10 Mathematics – Arithmetic Progressions MCQs
Chapter 5: Arithmetic Progressions
Topic: nth Term Formula and Applications
Based on NCERT | As per Latest CBSE Board Examination Pattern
1. The nth term of an AP is given by:
Correct Answer: B
Explanation: The formula for nth term of an AP is aₙ = a + (n − 1)d, where a is first term and d is common difference.
Explanation: The formula for nth term of an AP is aₙ = a + (n − 1)d, where a is first term and d is common difference.
2. Find the 10th term of AP: 2, 5, 8, 11, ...
Correct Answer: A
Explanation: a=2, d=3.
a₁₀ = 2 + (10−1)×3 = 2 + 27 = 29.
Explanation: a=2, d=3.
a₁₀ = 2 + (10−1)×3 = 2 + 27 = 29.
3. The common difference of AP: 7, 10, 13, 16 is:
Correct Answer: B
Explanation: d = 10 − 7 = 3.
Explanation: d = 10 − 7 = 3.
4. If a = 3 and d = 5, find 8th term.
Correct Answer: C
Explanation: a₈ = 3 + (8−1)×5 = 3 + 35 = 38.
Explanation: a₈ = 3 + (8−1)×5 = 3 + 35 = 38.
5. Find the 15th term of AP: 4, 9, 14, 19, ...
Correct Answer: C
Explanation: a=4, d=5.
a₁₅ = 4 + 14×5 = 74.
Explanation: a=4, d=5.
a₁₅ = 4 + 14×5 = 74.
6. Which of the following is an AP?
Correct Answer: C
Explanation: Common difference is 4.
Explanation: Common difference is 4.
7. If nth term is 3n + 1, first term is:
Correct Answer: C
Explanation: Put n=1 ⇒ 3(1)+1=4.
Explanation: Put n=1 ⇒ 3(1)+1=4.
8. For AP: 5, 8, 11, ..., find which term is 38.
Correct Answer: B
Explanation: aₙ = 5 + (n−1)3 = 38 ⇒ n=12.
Explanation: aₙ = 5 + (n−1)3 = 38 ⇒ n=12.
9. A taxi charges ₹50 plus ₹10 per km. Fare for 15 km is:
Correct Answer: B
Explanation: Fare = 50 + 15×10 = ₹200.
Explanation: Fare = 50 + 15×10 = ₹200.
10. Number of terms in AP 3, 7, 11, ..., 83 is:
Correct Answer: B
Explanation: aₙ = 3+(n−1)4=83 ⇒ n=21.
Explanation: aₙ = 3+(n−1)4=83 ⇒ n=21.
11. If a=2, d=4, find a₁₂.
Correct Answer: C
Explanation: a₁₂ = 2 + 11×4 = 46.
Explanation: a₁₂ = 2 + 11×4 = 46.
12. The 25th term of AP: 1, 4, 7, ... is:
Correct Answer: D
Explanation: aₙ = 1 + 24×3 = 73.
Explanation: aₙ = 1 + 24×3 = 73.
13. If 7th term is 19 and first term is 1, d is:
Correct Answer: B
Explanation: 19=1+(6)d ⇒ d=3.
Explanation: 19=1+(6)d ⇒ d=3.
14. The AP decreases when:
Correct Answer: C
Explanation: Negative common difference gives decreasing AP.
Explanation: Negative common difference gives decreasing AP.
15. If d=0, AP becomes:
Correct Answer: C
Explanation: All terms become equal.
Explanation: All terms become equal.
16. If nth term is 5n − 2, common difference is:
Correct Answer: B
Explanation: Difference between successive terms is 5.
Explanation: Difference between successive terms is 5.
17. First term of AP if aₙ = 4n − 1 is:
Correct Answer: A
Explanation: a₁ = 4(1)−1=3.
Explanation: a₁ = 4(1)−1=3.
18. If 20th term is 100 and first term 5, d is:
Correct Answer: B
Explanation: 100=5+19d ⇒ d=5.
Explanation: 100=5+19d ⇒ d=5.
19. In AP 2, 6, 10, ..., number of terms till 82 is:
Correct Answer: B
Explanation: 82=2+(n−1)4 ⇒ n=21.
Explanation: 82=2+(n−1)4 ⇒ n=21.
20. The nth term formula helps to:
Correct Answer: A
Explanation: nth term formula allows finding any required term directly.
Explanation: nth term formula allows finding any required term directly.
