CBSE Board Students Helpline

1. What is meant by power of accommodation of the eye? (1mark) 2. A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision? (1mark) 3. Write down the function of the iris in the human eye? (1mark) 4. Name the muscles responsible for bringing change in the focal length or the lens. (1mark) 5. Which cells of the retina are responsible for two light (black and white) vision? (1mark) 6. Why does it take some time to see objects in a dim room when you enter the room from bright sunlight outside? (2 marks) 7. What is Tyndall effect? Explain with an example. (2 marks) 8. Draw a labelled diagram to show the formatio...

SCIENCE SAMPLE QUESTION PAPER CLASS - X CLASS: X Maximum Marks: 60 Time Allowed: 2½ Hrs General Instructions: Ø The question paper comprises of two sections A and B. You are to attempt both the sections. Ø The candidates are advised to attempt all the questions of Section A separately and section B separately. Ø All questions are compulsory. Ø There is no overall choice. However, internal choice has been provided for five questions in Section A and one question of 3 marks category in section B. You are to attempt only option in such questions. Ø Marks allocated to each question are indicated against it. Ø Questions 1 to 5 in Section A and 18,19 in Section B are very short answer questions. These are to be answered in one word or one sentence only. Ø Questions 6 to 10 in Section A and 20,21 in Section B are short answer questions. These are to be answered in about 30-40 words ...

CLASS: X Maximum Marks: 60 Time Allowed: 2½ Hrs General Instructions: Ø The question paper comprises of two sections A and B. You are to attempt both the sections. Ø The candidates are advised to attempt all the questions of Section A separately and section B separately. Ø All questions are compulsory. Ø There is no overall choice. However, internal choice has been provided for five questions in Section A and one question of 3 marks category in section B. You are to attempt only option in such questions. Ø Marks allocated to each question are indicated against it. Ø Questions 1 to 5 in Section A and 18,19 in Section B are very short answer questions. These are to be answered in one word or one sentence only. Ø Questions 6 to 10 in Section A and 20,21 in Section B are short answer questions. These are to be answered in about 30-40 words each. Ø Questions11 to 15 in Sectio...