CBSE Class 10 Science 2020 Previous Year Question Paper (Delhi Set - 3)
This is the CBSE Class 10 Science 2020 Main Exam Delhi Set - 3 previous year question paper. The paper comprises three sections: A, B, and C, with a total of 30 compulsory questions. Section A includes questions 1-14, each carrying one mark, and consists of multiple-choice questions (MCQ), very short answer (VSA), and Assertion-Reason types. Section B contains questions 15-24, which are short answer type questions worth 3 marks each, with answers not exceeding 50-60 words. Section C features long answer type questions from 25-30, each carrying 5 marks and requiring answers within 80-90 words. While there is no overall choice, internal choices are provided in some questions within each section. Solving this board question paper is crucial for students to understand the exam structure, question types, and marking scheme, thereby enhancing their preparation and performance in the upcoming board examinations.
Quick info
| Board | CBSE |
|---|---|
| Class | 10 |
| Subject | Science |
| Session | 2020 |
| Language | English |
| Type | Previous Year Question Paper |
| Exam type | Board Exam |
Paper pattern
The question paper has 30 questions divided into three sections (A, B, C). Section A has 1-mark questions, Section B has 3-mark questions, and Section C has 5-mark questions.
Topics covered
Paper topics
- Cyclic unsaturated carbon compounds
- Alternating current vs. Direct current
- Population growth
- Sexual maturation
- Contraceptive methods
- Population size determinants
- Signs of sexual maturation
- Female foeticide
- Hormonal balance
- Reproduction
Important topics
- Carbon compounds
- Electricity
- Human Reproduction
- Population Control
PDF preview
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Question paper text
Science Delhi (Set 3)
General Instructions:
Read the following instructions very carefully and strictly follow them:
- Question paper comprises three sections - A, B and C.
There are 30 questions in the question paper. All questions are compulsory.
- Section A - question no. 1 to 14 - all questions or part thereof are of one mark
each. These questions comprises multiple choice questions (MCQ), very short answer (VSA), and Assertion-Reason type questions. Answer to these questions should be given in one word or one sentence.
- Section B - question no. 15 to 24 are short answer type questions, carrying 3 marks each. Answer to these questions should not exceed 50 to 60 words.
- Section C - question no. 25 to 30 are long answer type questions, carrying 5 marks each. Answer to these questions should not exceed 80 to 90 words.
- Answer should be brief and to the point. Also the above mentioned word limit be adhered to as far as possible.
- There is no overall choice in the question paper. However, an internal choice has been provided in some questions in each Section. Only one of the choices in such questions have to be attempted.
- In addition to this, separate instructions are given with each section and question, wherever necessary.
Science Delhi (Set 3)
Question 1
Name a cyclic unsaturated carbon compound.
Solution:
An example of a cyclic unsaturated compound is Cyclobutene.
H-C-C-H Cyclobutene
Question 2
State an important advantage of using alternating current (a.c.) over direct current (d.c.).
Solution:
An important advantage of using alternating current (a.c.) over direct current (d.c.) is that alternating current can be easily transformed to higher or lower voltage levels while it is difficult to do that with direct current.
Question 3
The growing size of the human population is a cause of concern for all people. The rate of birth and death in a given population will determine its size. Reproduction is the process by which organisms increase their population. The process of sexual maturation for reproduction is gradual and takes place while general body growth is still going on. Some degree of sexual maturation does not necessarily mean that the mind or body is ready for sexual acts or for having and bringing up children. Various contraceptive devices are being used by human beings to control the size of population.
- List two common signs of sexual maturation in boys and girls.
- What is the result of reckless female foeticide?
- Which contraceptive method changes the hormonal balance of the body?
- Write two factors that determine the size of a population.
Solution:
- Two common signs for sexual maturation in boys and girls are as follows:
- Broadening of shoulder and chest in boys and development of mammary gland or breast in girls.
- Appearance of hairs on various body parts like pubic area, armpits and face.
Frequently asked questions
What is this document?
This is the CBSE Class 10 Science 2020 Main Exam Delhi Set - 3 previous year question paper, designed for board exam practice.
What is the structure of the question paper?
The paper has three sections (A, B, C) with a total of 30 questions. Section A has 1-mark questions, Section B has 3-mark questions, and Section C has 5-mark questions.
Are there choices available in the questions?
There is no overall choice in the question paper, but internal choices are provided in some questions within each section.
How does solving previous year papers help?
Solving previous year question papers helps students understand the board pattern, question types, and marking scheme, improving their exam preparation and confidence.
What is the duration and maximum marks for this paper?
The provided text details the question structure and marks per question but does not explicitly state the total duration or maximum marks for the entire paper.
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