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Mayur Arya

Asked: December 22, 2023In: Class 10 Science

Explain the reason for the following: (i) Aluminium oxide is called an amphoteric oxide. (ii) An iron strip dipped in a blue copper sulphate solution turns the blue solution pale green. (iii) Hydrogen gas is not evolved when most metals react with nitric acid. (iv) Calcium does not occur in free state in nature. (v) Sodium or potassium metals are kept immersed under kerosene.

CBSE NCERT Science Class 10 Sample Question Paper 2023-2024

Mayur Arya

Asked: December 22, 2023In: Class 10 Science

Metal X is found in nature as its sulphide XS. It is used in the galvanisation of iron articles. Identify the metal X. How will you convert this sulphide ore into the metal? Explain with equations.

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

Kiara Singh

Asked: December 22, 2023In: Class 10 Science

Describe the role of prostate gland, seminal vesicle and testes in the human male reproductive system. How is the surgical removal of unwanted pregnancies misused? Explain the role of oral contraceptive pills in preventing conception.

2023-2024 CBSE Science Class 10 Sample Question Paper download

Kiara Singh

Asked: December 22, 2023In: Class 10 Science

Why do multicellular organisms use complex way of reproduction?

NCERT, CBSE Science Class 10 Sample Question Paper 2023-2024 download with solutions

Prasant

Asked: December 21, 2023In: Class 10 Science

i) What is meant by power of a lens? (ii) You have three lenses L1, L2 and L3 of powers +10D, +5D and -10D respectively. State the nature and focal length of each lens. (iii) Explain which of the three lenses will form a virtual and magnified image of an object placed at 15 cm from the lens. (iv) Draw the ray diagram in support of your answer.

CBSE Class 10 Science Sample Question Paper new 2023-2024 with Solutions

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