Question Paper
Class / Subject: Class 9 (ICSE) · Mathematics
Chapter: Chapter 23 — Chapter 23: Trigonometrical Ratios of Standard Angles
Time Allowed: 32 minutes
Max Marks: 16
1. What is sin 30°? [1]
(A) 1/2
(B) 1
(C) 0
(D) √3/2
2. What is sin 90°? [1]
(A) 1
(B) 0
(C) 1/2
(D) √2/2
3. What is cos 0°? [1]
(A) 1
(B) 0
(C) 1/2
(D) √3/2
4. What is cos 90°? [1]
(A) 0
(B) 1
(C) 1/2
(D) √2/2
5. What is tan 45°? [1]
(A) 1
(B) 0
(C) Undefined
(D) √3
6. What is tan 90°? [1]
(A) Undefined
(B) 1
(C) 0
(D) √3
7. What is sin 45°? [1]
(A) √2/2
(B) 1/2
(C) 1
(D) 0
8. Why memorise these standard values? [1]
(A) To speed up trigonometry problem-solving
(B) No reason
(C) It's not useful
(D) Only for tests
9. What is sin 30°? [1]
(A) 1/2
(B) 1
(C) 0
(D) √3/2
10. What is sin 90°? [1]
(A) 1
(B) 0
(C) 1/2
(D) √2/2
11. What is cos 0°? [1]
(A) 1
(B) 0
(C) 1/2
(D) √3/2
12. What is cos 90°? [1]
(A) 0
(B) 1
(C) 1/2
(D) √2/2
13. What is tan 45°? [1]
(A) 1
(B) 0
(C) Undefined
(D) √3
14. What is tan 90°? [1]
(A) Undefined
(B) 1
(C) 0
(D) √3
15. What is sin 45°? [1]
(A) √2/2
(B) 1/2
(C) 1
(D) 0
16. Why memorise these standard values? [1]
(A) To speed up trigonometry problem-solving
(B) No reason
(C) It's not useful
(D) Only for tests