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Rajshree Chatterjee

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290Questions

Mayur Arya

Asked: December 22, 2023In: Class 10 Science

A lens produces a magnification of -0.5. Is this a converging or diverging lens? If the focal length of the lens is 6 cm, draw a ray diagram showing the image formation in this case. A girl was playing with a thin beam of light from a laser torch by directing it from different directions on a convex lens held vertically. She was surprised to see that in a particular direction, the beam of light continues to move along the same direction after passing through the lens. State the reason for her observation. Draw a ray diagram to support your answer.

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

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

Subham Kumar

Asked: December 19, 2023In: Class 10 Science

Noopur needs a lens of power -4.5D for correction of her vision. a) What kind of defect in vision is she suffering from? b) What is the focal length and nature of the corrective lens? c) Draw ray diagrams showing the (a) defected eye and (b) correction for this defect. d) What are the causes of this defect?

CBSE class 10 science sample question paper 2023-2024 free download

Subham Kumar

Asked: December 19, 2023In: Class 10 Science

“Both overproduction and underproduction of Growth hormone leads to disorders in the body.” Explain.

cbse class 10 science sample question paper 2023-24

Subham Kumar

Asked: December 19, 2023In: Class 10 Science

Our government launches campaigns to provide information about AIDS prevention, testing and treatment by putting posters, conducting radio shows and using other agencies of advertisements. a) To which category of diseases AIDS belong? Name its causative organism. b) Which kind of value is government trying to develop in the citizens by conducting the above kind of programs.

Class 10 CBSE science sample question paper 2023-2024

Subham Kumar

Asked: December 19, 2023In: Class 10 Science

A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound and write its chemical formula. Write the chemical equation for its preparation. Mention any one use of the compound.

NCERT, CBSE Class 10 Science sample question paper 2023-2024

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Rajshree Chatterjee

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.

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.

Why do multicellular organisms use complex way of reproduction?

“Both overproduction and underproduction of Growth hormone leads to disorders in the body.” Explain.

A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound and write its chemical formula. Write the chemical equation for its preparation. Mention any one use of the compound.

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