{"id":4241,"date":"2019-10-22T18:29:31","date_gmt":"2019-10-22T12:59:31","guid":{"rendered":"https:\/\/versionweekly.com\/?p=4241"},"modified":"2019-10-22T18:29:31","modified_gmt":"2019-10-22T12:59:31","slug":"cbse-sample-question-papers-for-class-10-science-2020-board-exam","status":"publish","type":"post","link":"https:\/\/versionweekly.com\/news\/cbse\/cbse-sample-question-papers-for-class-10-science-2020-board-exam\/","title":{"rendered":"CBSE Sample Question Papers for Class 10 Science 2020 Board Exam"},"content":{"rendered":"

CBSE Sample Question Papers for Class 10 Science 2020<\/h2>\n

Class-X
\nScience-086
\nSAMPLE QUESTION PAPER 2019-20<\/p>\n

TIME: 3 Hrs. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0M.M. : 80<\/p>\n

General Instructions:<\/p>\n

    \n
  1. The question paper comprises three sections – A, B and C. Attempt all the sections.<\/li>\n
  2. All questions are compulsory.<\/li>\n
  3. Internal choice is given in each section.<\/li>\n
  4. All questions in Section A are one-mark questions comprising MCQ, VSA type and assertion-reason type questions. They are to be answered in one word or in one sentence.<\/li>\n
  5. All questions in Section B are three-mark, short-answer type questions. These are to be answered in about 50 – 60 words each.<\/li>\n
  6. All questions in Section C are five-mark, long-answer type questions. These are to be answered in about 80 – 90 words each.<\/li>\n
  7. This question paper consists of a total of 30 questions.<\/li>\n<\/ol>\n

    SECTION A<\/strong><\/p>\n

    Question 1.
    \nDefine catenation.\u00a0 [1]<\/strong><\/p>\n

    Question 2.
    \nHow does valency of an element vary across a period?\u00a0 [1]<\/strong><\/p>\n\n\n\n\n\n\n
    \n

    2020 Board Exam:\u00a0<\/strong>Download CBSE Sample Papers for Class 10 Bundle PDF<\/a><\/strong><\/h3>\n<\/th>\n<\/tr>\n

    CBSE Sample Papers for Class 10 Maths<\/a><\/strong><\/td>\nCBSE Sample Papers for Class 10 Standard<\/a><\/strong><\/td>\n<\/tr>\n
    CBSE Sample Papers for Class 10 English<\/a><\/strong><\/td>\nCBSE Sample Papers for Class 10 Sanskrit<\/a><\/strong><\/td>\n<\/tr>\n
    CBSE Sample Papers for Class 10 Social Science<\/a><\/strong><\/td>\nFormula Handbook for Class 10 Maths and Science<\/a><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Question 3.
    \nAnswer question numbers 3(a) – 3(d) on the basis of your understanding of the following paragraph and the related studied concepts.
    \nRenewable energy sources such as wind energy are vital for the Indian economy, not only from the point of view of supply, but also from the perspective of environmental and social benefits. India is the world\u2019s fifth largest wind-power producer and the largest windmill facilities in India are installed in Tamil Nadu. Muppandal is a small village of Tamil Nadu and one of the most important sites of wind-farm in the state. It uses wind from the Arabian Sea to produce renewable energy. The suitability of Muppandal as a site for wind farms stems from its geographical location as it has access to the seasonal monsoon winds.
    \n\"CBSE
    \nThe electrical generators used on wind turbines in sites like Muppandal, produce an output AC of 240 V and a frequency of 50 Hz even when the wind speed is fluctuating. A transformer may be required to increase or decrease the voltage so it is compatible with the end usage, distribution or transmission voltage, depending on the type of interconnection.<\/p>\n

    3(a) State the principle behind electric generator.\u00a0 [1]<\/strong>
    \n3(b) The output frequency of wind turbine is 50 Hz. What is meant by this statement?\u00a0 [1]<\/strong>
    \n3(c) Why do you think Muppandal is at an advantageous position for this project?\u00a0 [1]<\/strong>
    \n3(d) Based on the data represented in the graph below, which of the two cities A or B would be an ideal location for establishing a wind-farm and why?\u00a0 [1]<\/strong>
    \n\"CBSE<\/p>\n

    Practice\u00a0MCQ Questions for Class 10 Maths With Answers<\/a><\/strong>\u00a0for 2020 Board Exams.<\/p>\n

    Question 4.
    \nQuestion numbers 4(a) – 4(d) are based on the two tables given below. Study these tables related to blood sugar levels and answer the questions that follow.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Table A (Blood glucose Chart)<\/em><\/td>\n<\/tr>\n
    <\/td>\nMean Blood Glucose Level (mg\/dL)<\/td>\n<\/tr>\n
    Doctor\u2019s advice needed<\/td>\n380<\/td>\n<\/tr>\n
    350<\/td>\n<\/tr>\n
    315<\/td>\n<\/tr>\n
    280<\/td>\n<\/tr>\n
    250<\/td>\n<\/tr>\n
    215<\/td>\n<\/tr>\n
    Good<\/td>\n180<\/td>\n<\/tr>\n
    150<\/td>\n<\/tr>\n
    Excellent<\/td>\n115<\/td>\n<\/tr>\n
    80<\/td>\n<\/tr>\n
    50<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n\n\n\n
    Table B (Blood Report of Patient X and Y)<\/td>\n<\/tr>\n
    Time of check<\/td>\nBlood Glucose ranges (mg\/dL)<\/td>\n<\/tr>\n
    <\/td>\nPatient X<\/td>\nPatient Y<\/td>\n<\/tr>\n
    Before breakfast (Fasting)<\/td>\n< 100<\/td>\n70 – 130<\/td>\n<\/tr>\n
    Before lunch, supper and snack<\/td>\n< 110<\/td>\n70 – 130<\/td>\n<\/tr>\n
    Two hours after meals<\/td>\n< 140<\/td>\n< 180<\/td>\n<\/tr>\n
    Bedtime<\/td>\n< 120<\/td>\n90- 15<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    4(a) Refer to Table B showing the blood report of the levels of glucose of patients X and Y. Infer the disease which can be diagnosed from the given data.\u00a0 [1]<\/strong>
    \n4(b) Identify the hormone whose level in the blood is responsible for the above disease.\u00a0 [1]<\/strong><\/p>\n

    4(c) Which one of the following diets would you recommended to the affected patient?\u00a0 [1]<\/strong>
    \ni) High sugar and low fat diet.
    \nii) Low sugar and high protein diet.
    \niii) High Fat and low fiber diet.
    \niv) Low sugar and high fiber diet.<\/p>\n

    4(d) Refer to the Table A and suggest the value of the mean blood glucose level beyond which doctor\u2019s advice is necessary:\u00a0 [1]<\/strong>
    \ni) 180 mg\/dL
    \nii) 115 mg\/dL
    \niii) 50 mg\/dL
    \niv) 80 mg\/dL<\/p>\n

    Question 5.
    \nWhen we enter a dark room coming from outside, immediately the things inside the room do not appear clear to our eyes. This is because\u00a0 [1]<\/strong>
    \ni) pupils do not open at all in the dark.
    \nii) pupils take time to adjust.
    \niii) light travels slower in a dark room.
    \niv) pupils open very quickly in the dark.
    \nOR
    \nThe phenomena of light responsible for the working of the human eye is
    \ni) reflection
    \nii) refraction
    \niii) power of accommodation
    \niv) persistence of vision<\/p>\n

    Question 6.
    \nWhen a 4V battery is connected across an unknown resistor there is a current of 100 mA in the circuit. The value of the resistance of the resister is:\u00a0 [1]<\/strong>
    \ni) 4 \u2126
    \nii) 40 \u2126
    \niii) 400 \u2126
    \niv) 0.4 \u2126<\/p>\n

    Question 7.
    \nUnit of electric power may also be expressed as:\u00a0 [1]<\/strong>
    \ni) volt-ampere
    \nii) kilowatt-hour
    \niii) watt-second
    \niv) joule-second<\/p>\n

    Question 8.
    \nIt was found that water from a river was contaminated with Coliform bacteria. Which one 1 of the following pollutant might have got mixed with the water?\u00a0 [1]<\/strong>
    \ni) Fertilizer run off
    \nii) Industrial waste
    \niii) Pesticides
    \niv) Human faecal matter
    \nOR
    \nWhich one of the following stakeholders of forests causes the maximum damage to forest?
    \ni) People who live in or around the forest
    \nii) The forest department of the government
    \niii) The wildlife and native enthusiasts
    \niv) The industrialists<\/p>\n

    Question 9.
    \nWhich one of the following green house gases is a contributor due to incomplete combustion of coal and petroleum?\u00a0 [1]<\/strong>
    \ni) Oxides of nitrogen
    \nii) Methane
    \niii) Carbon monoxide
    \niv) Carbon dioxide<\/p>\n

    Question 10.
    \nWhich of the following reactions is an endothermic reaction?\u00a0 [1]<\/strong>
    \ni) Burning of coal.
    \nii) Decomposition of vegetable matter into compost.
    \niii) Process of respiration.
    \niv) Decomposition of calcium carbonate to form quick lime and carbon dioxide.<\/p>\n

    Question 11.
    \nIdentify the basic salt from the following salts:\u00a0 [1]
    \n<\/strong>i) Na2<\/sub>CO3<\/sub>
    \nii) NH4<\/sub>CI
    \niii) NaNO3<\/sub>
    \niv) KCl<\/p>\n