CBSE Class 10 Science Boards 2020 Sample Paper Solved. CBSE has recently released the sample papers for class 10 for subject Science. These papers are released every year by CBSE so that the students can understand the pattern of question paper which is expected to come in the Class 10 board exams. Students can refer to the attached question paper along with marking scheme to understand what they can expect in the board exams in 2020. Its always better to solve the question paper first and then refer to provided answers.
1 Define catenation.
2 How does valency of an element vary across a period?
3 Answer question numbers 3(a) - 3(d) on the basis of your understanding of the following paragraph and the related studied concepts.
Renewable 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’s 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.
The 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.
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.
3(a) State the principle behind electric generator.
3(b) The output frequency of wind turbine is 50 Hz. What is meant by this statement?
3(c) Why do you think Muppandal is at an advantageous position for this project?
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.
4(b) Identify the hormone whose level in the blood is responsible for the above disease.
4(c) Which one of the following diets would you recommended to the affected patient?
i) High sugar and low fat diet.
ii) Low sugar and high protein diet.
iii) High Fat and low fiber diet.
iv) Low sugar and high fiber diet.
4(d) Refer to the Table A and suggest the value of the mean blood glucose level beyond which doctor’s advice is necessary:
i) 180 mg/dL
ii) 115 mg/dL
iii) 50 mg/dL
iv) 80 mg/dL
5 When we enter a dark room coming from outside, immediately the things inside the room do not appear clear to our eyes. This is because
i) pupils do not open at all in the dark.
ii) pupils take time to adjust.
iii) light travels slower in a dark room.
iv) pupils open very quickly in the dark.
The phenomena of light responsible for the working of the human eye is
iii) power of accommodation
iv) persistence of vision
When 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:
i) 4 Ω
ii) 40 Ω
iii) 400 Ω
iv) 0.4 Ω
7 Unit of electric power may also be expressed as:
8 It was found that water from a river was contaminated with Coliform bacteria. Which one of the following pollutant might have got mixed with the water?
i) Fertilizer run off
ii) Industrial waste
iv) Human faecal matter
Which one of the following stakeholders of forests causes the maximum damage to forest?
i) People who live in or around the forest
ii) The forest department of the government
iii) The wildlife and native enthusiasts
iv) The industrialists
9 Which one of the following green house gases is a contributor due to incomplete combustion of coal and petroleum?
i) Oxides of nitrogen
iii) Carbon monoxide
iv) Carbon dioxide
10 Which of the following reactions is an endothermic reaction?
i) Burning of coal.
ii) Decomposition of vegetable matter into compost.
iii) Process of respiration.
iv) Decomposition of calcium carbonate to form quick lime and carbon dioxide.
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