cbse sample question paper with answer for class 10

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Rajshree Chatterjee

Asked: December 26, 2023In: Class 10 Science

Gas A, found in the upper layers of the atmosphere, is a deadly poison but is essential for all living beings. The amount of this gas started declining sharply in the 1980s. a. Identify Gas A. How is it formed at higher levels of the atmosphere? b. Why is it essential for all living beings? State the cause for the depletion of this gas.

The upper layers of the Earth’s atmosphere, including the thermosphere and exosphere, extend beyond the mesosphere. They contain sparse air molecules and play a crucial role in phenomena like auroras.

Kiara Singh

Asked: December 26, 2023In: Class 10 Science

A student boils water in an electric kettle for 20 minutes. Using the same mains supply he wants to reduce the boiling time of water. To do so should he increase or decrease the length of the heating element? Justify your answer.

A heating element is a device that converts electrical energy into heat. It is commonly used in appliances like stoves, toasters, and water heaters to generate the necessary warmth.

Sandeep Jha

Asked: December 26, 2023In: Class 10 Science

Two pea plants – one with round yellow seeds (RRYY) and another with wrinkled green (rryy) seeds produce F1 progeny that have round, yellow (RrYy) seeds. When F1 plants are self-pollinated, which new combination of characters is expected in F2 progeny? How many seeds with these new combinations of characters will be produced when a total 160 seeds are produced in F2 generation? Explain with reason.

Cross-pollination is a plant reproduction process where pollen is transferred from the male reproductive organ of one flower to the female reproductive organ of another, enhancing genetic diversity.

Kiara Singh

Asked: December 22, 2023In: Class 10 Science

Suppose your parents have constructed a two room house and you want that in the living room there should be a provision of one electric bulb, one electric fan, a refrigerator and a plug point for appliances of power up to 2 kilowatt. Draw a circuit diagram showing electric fuse and earthing as safety devices.

CBSE Science Class 10 Sample Question Paper 2023-2024 free download with answers

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