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Home/cbse sample question paper

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Rajshree Chatterjee
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.

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Kiara Singh
Kiara Singh
Asked: December 26, 2023In: Class 10 Science

In the above circuit, if the current reading in the ammeter A is 2A, what would be the value of R1?

In the above circuit, if the current reading in the ammeter A is 2A, what would be the value of R1?

An ammeter measures electric current in amperes within an electrical circuit. A circuit is a closed loop of conductive elements where electrons flow. Ammeters help monitor and control current flow.

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Sandeep Jha
Sandeep Jha
Asked: December 26, 2023In: Class 10 Science

It would cost a man Rs. 3.50 to buy 1.0 kW h of electrical energy from the Main Electricity Board. His generator has a maximum power of 2.0 kW. The generator produces energy at this maximum power for 3 hours. Calculate how much it would cost to buy the same amount of energy from the Main Electricity Board.

Electrical energy is a form of energy resulting from the movement of charged particles (electrons). It powers electronic devices and is generated from various sources, including fossil fuels, renewables, and nuclear.

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Sandeep Jha
Sandeep Jha
Asked: December 26, 2023In: Class 10 Science

How many isomers are possible for the compound with the molecular formula C4H8? Draw the electron dot structure of branched chain isomer. How will you prove that C4H8 and C5H10 are homologues?

Isomers are molecules with the same chemical formula but different structures. Structural isomers differ in arrangement, geometric isomers have different spatial arrangements, and stereoisomers have the same connectivity but differ in spatial arrangement.

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Prasant
Prasant
Asked: December 22, 2023In: Class 10 Science

Create a terrestrial food chain depicting four trophic levels. Why do we not find food chains of more than four trophic levels in nature?

CBSE class 10 science sample question paper 2023-2024

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