Here, you will get the CBSE Class 10 Science Solved Practice Paper 2017-2018: Set-II. This practice paper consists of questions picked from most important topics of CBSE class 10 Science.
This Practice paper is specially prepared by the subject experts after the brief analysis of previous year question papers and the latest examination pattern. The paper has been designed following the exact format that employed in the latest class 10 Science sample paper released by the CBSE.
Some significant features of this paper are:
- Covers the whole syllabus of CBSE class 10 Science.
- Follows the latest examination pattern for class 10 Science board exam 2018.
- Each question has been provided with an apt and easy solution.
- Questions have been asked from only those topics which are important from exam point of view.
Practicing this paper will help the students in understanding the depth with which a topic should be studied in order to prepare for the board exams more effectively and get the desired result.
Structure of this paper is as below:
- This paper consists of 27 questions divided into two sections, A and B.
- Question numbers 1 and 2 in Section-A are one mark question.
- Question numbers 3 to 5 in Section- A are two marks questions.
- Question numbers 6 to 15 in Section-A are three marks questions.
- Question numbers 16 to 21 in Section-A are 5 marks questions.
- Question numbers 22 to 27 in Section- B are practical based question carrying two marks each.
- Total Marks: 80
- Maximum Time: 3 hours
This CBSE Class 10 Science Practice Paper will not only help you acquaint with the important topics of Science but also give you a preview of the question paper which you will be solving in the class 10 Science board exam 2018.
Some sample questions and their solutions from the CBSE Class 10 Science Solved Practice Paper 2018 are given below:
Q. Name the two sets of nerves that constitute the peripheral nervous system.
Sympathetic nervous system and Parasympathetic nervous system.
Q. How does Plasmodium reproduce. Is this method sexual or asexual?
Plasmodium reproduces by a process known as multiple fission. Multiple fission is a type of asexual reproduction in which a single parent cell divides into several daughter cells. During this process, the parent nucleus divides several times into a number of daughter nuclei. After the division of nucleus, the cytoplasm divides into as many parts as the number of daughter nuclei so that each part surrounds each nucleus. Each uninucleate piece develops an outer membrane and finally the parent cell divides into several uninucleate individuals.
Q. What are the modes of excretion in plants?
Modes of excretion in plants are:
- The plants get rid of excess water by transpiration.
- Plants produce oxygen during photosynthesis while carbon dioxide during respiration as waste products which can be released outside by diffusion through stomata or root cell walls.
- Organic wastes of plants get stored within dead permanent tissues such as bark or within leaves which are periodically removed.
- Gums, resins, etc are stored in old xylem tissues as a waste product.
Q. (a) Mention the pH range within which our body works. Explain how antacids
give relief from acidity. Write the name of one such antacid.
(b) Fresh milk has a pH of 6. How does the pH will change as it turns to curd? Explain your answer.
(c) A milkman adds a very small amount of baking soda to fresh milk. Why does this milk take a longer time to set as curd?
(d) Mention the nature of toothpastes. How do they prevent tooth decay?
(a) Our stomach has pH equal to 2. Antacids neutralizes excess of acid in our body and gives relief from hyperacidity. Sodium hydrogencarbonate is one of such antacid.
(b) pH will decrease as it turns to curd because curd is acidic due to the presence of lactic acid.
(c) It takes longer time to set as curd as bacteria do not work well in presence of sodium hydrogencarbonate, i.e. fermentation will take place slowly.
(d) Toothpastes are basic in nature. They neutralize the acid formed in mouth which causes tooth decay.
Q. Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponificationreaction.
Raw Materials Required For preparation of soap in laboratory are :
- Vegetable oil
- Sodium Hydroxide
- Commom salt
Test to determine the nature of reaction mixture: When a red litmus paper is dipped in the reaction mixture, the paper changes its colour to blue. Hence, the reaction mixture of the saponification reaction is basic in nature.