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Prasant

Asked: December 29, 2023In: Class 10 Science

A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and the size of the image formed.

A convex lens is a transparent optical device with curved surfaces that converges light rays, causing them to meet at a focal point. It is used in magnifying glasses, cameras, and eyeglasses.

Prasant

Asked: December 27, 2023In: Class 10 Science

A metal X is obtained from its chloride salt by exposure to sunlight. (a) In which section of the reactivity series of metals- top, middle or bottom, is it likely to be placed? Justify your answer. (b) Identify the type of reaction the chloride salt of metal X undergoes on exposure to sunlight.

Exposure of certain metals to sunlight may lead to photochemical reactions, causing oxidation or corrosion. Ultraviolet (UV) radiation can accelerate these processes, affecting the appearance and properties of the metal.

Prasant

Asked: December 27, 2023In: Class 10 Science

Equal sized bars of aluminium and iron are exposed to the environment as shown below. Which of them is likely to corrode till the level marked by the line FIRST? Justify your answer.

Exposed iron reacts with oxygen and moisture in the environment, forming iron oxide, commonly known as rust. This corrosion weakens the metal, leading to degradation and loss of structural integrity.

Prasant

Asked: December 27, 2023In: Class 10 Science

A helical coil whose length is greater than its diameter is connected to a battery as shown below. (a) How does the magnetic field at point P compare with the magnetic field at point Q? Justify your answer. (b) State one way in which the strength of the magnetic field inside a current carrying helical coil can be changed?

A helical coil is a structure formed by winding a flexible material, like a tube or wire, into a spiral shape. It is commonly used in heat exchangers and other fluid systems.

Prasant

Asked: December 22, 2023In: Class 10 Science

Explain the processes of aerobic respiration in mitochondria of a cell and anaerobic respiration in yeast and muscle with the help of word equations.

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

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Prasant

A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and the size of the image formed.

A metal X is obtained from its chloride salt by exposure to sunlight. (a) In which section of the reactivity series of metals- top, middle or bottom, is it likely to be placed? Justify your answer. (b) Identify the type of reaction the chloride salt of metal X undergoes on exposure to sunlight.

Equal sized bars of aluminium and iron are exposed to the environment as shown below. Which of them is likely to corrode till the level marked by the line FIRST? Justify your answer.

Explain the processes of aerobic respiration in mitochondria of a cell and anaerobic respiration in yeast and muscle with the help of word equations.

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