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Q31
22. 1g of copper powder was taken in a China dish and heated. What change takes place on heating? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Give the chemical equations of reactions, the name, and the colour of the products formed in each case.

Free Response Question Hard View solution

Q32
23. The near point of the eye of a person is 50 cm. Find the nature and the power of the corrective lens required by the person to enable him to see clearly the objects placed at 25 cm from the eye.

Free Response Question Hard View solution

Q33
24. What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor. Justify your answer.

Free Response Question Medium View solution

Q34
25. Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed :
(i) between optical centre and principal focus of a convex lens. State the signs and values of magnifications

Free Response Question Hard View solution

Q35
25. Draw a ray diagram in the following cases to show the formation of image, when the object is placed:
(ii) anywhere in front of a concave lens. State the signs and values of magnification.

Free Response Question Hard View solution

Q36
25. Draw a ray diagram in the following case to show the formation of image, when the object is placed:
(iii) at 2F of a convex lens

Free Response Question Hard View solution

Q37
25. An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length of 15.0 cm.
(i) At what distance from the mirror should a screen be placed in order to obtain a sharp image?

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Q38
25. An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length of 15.0 cm.
(ii) Find the size of the image.

Free Response Question View solution

Q39
25. An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length of 15.0 cm.
(iii) Draw a ray diagram to show the formation of image in this case.

Free Response Question Hard View solution

Q40
26. (a) What is the law of dominance of traits? Explain with an example.

Free Response Question Hard View solution

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2020

Q31
22. 1g of copper powder was taken in a China dish and heated. What change takes place on heating? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Give the chemical equations of reactions, the name, and the colour of the products formed in each case.

Solution

Q32
23. The near point of the eye of a person is 50 cm. Find the nature and the power of the corrective lens required by the person to enable him to see clearly the objects placed at 25 cm from the eye.

Solution

Q33
24. What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor. Justify your answer.

Solution

Q34
25. Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed :
(i) between optical centre and principal focus of a convex lens. State the signs and values of magnifications

Solution

Q35
25. Draw a ray diagram in the following cases to show the formation of image, when the object is placed:
(ii) anywhere in front of a concave lens. State the signs and values of magnification.

Solution

Q36
25. Draw a ray diagram in the following case to show the formation of image, when the object is placed:
(iii) at 2F of a convex lens

Solution

Q37
25. An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length of 15.0 cm.
(i) At what distance from the mirror should a screen be placed in order to obtain a sharp image?

Solution

Q38
25. An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length of 15.0 cm.
(ii) Find the size of the image.

Solution

Q39
25. An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length of 15.0 cm.
(iii) Draw a ray diagram to show the formation of image in this case.

Solution

Q40
26. (a) What is the law of dominance of traits? Explain with an example.

Solution

Subjects

2020

Q31 22. 1g of copper powder was taken in a China dish and heated. What change takes place on heating? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Give the chemical equations of reactions, the name, and the colour of the products formed in each case.

Solution

Q32 23. The near point of the eye of a person is 50 cm. Find the nature and the power of the corrective lens required by the person to enable him to see clearly the objects placed at 25 cm from the eye.

Solution

Q33 24. What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor. Justify your answer.

Solution

Q34 25. Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed : (i) between optical centre and principal focus of a convex lens. State the signs and values of magnifications

Solution

Q35 25. Draw a ray diagram in the following cases to show the formation of image, when the object is placed: (ii) anywhere in front of a concave lens. State the signs and values of magnification.

Solution

Q36 25. Draw a ray diagram in the following case to show the formation of image, when the object is placed: (iii) at 2F of a convex lens

Solution

Q37 25. An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length of 15.0 cm. (i) At what distance from the mirror should a screen be placed in order to obtain a sharp image?

Solution

Q38 25. An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length of 15.0 cm. (ii) Find the size of the image.

Solution

Q39 25. An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length of 15.0 cm. (iii) Draw a ray diagram to show the formation of image in this case.

Solution

Q40 26. (a) What is the law of dominance of traits? Explain with an example.

Solution

Subjects

Q31
22. 1g of copper powder was taken in a China dish and heated. What change takes place on heating? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Give the chemical equations of reactions, the name, and the colour of the products formed in each case.

Q32
23. The near point of the eye of a person is 50 cm. Find the nature and the power of the corrective lens required by the person to enable him to see clearly the objects placed at 25 cm from the eye.

Q33
24. What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor. Justify your answer.

Q34
25. Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed :
(i) between optical centre and principal focus of a convex lens. State the signs and values of magnifications

Q35
25. Draw a ray diagram in the following cases to show the formation of image, when the object is placed:
(ii) anywhere in front of a concave lens. State the signs and values of magnification.

Q36
25. Draw a ray diagram in the following case to show the formation of image, when the object is placed:
(iii) at 2F of a convex lens

Q37
25. An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length of 15.0 cm.
(i) At what distance from the mirror should a screen be placed in order to obtain a sharp image?

Q38
25. An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length of 15.0 cm.
(ii) Find the size of the image.

Q39
25. An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length of 15.0 cm.
(iii) Draw a ray diagram to show the formation of image in this case.

Q40
26. (a) What is the law of dominance of traits? Explain with an example.