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Q1
Write the name and formula of the second member of the carbon compounds having functional group—OH.

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Q2
State one function of iris in human eye.

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Q3
What happens when higher energy ultraviolet radiations act on the oxygen at the higher level of the atmosphere?

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Q4
In a food chain, if 10,000 joules of energy is available to the producer, how much energy will be available to the secondary consumer to transfer it to the tertiary consumer?

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Q5
Choose from the following: 6C, 80, 10Ne, 11Na, 14Si (i) Elements that should be in the same period. (ii) Elements that should be in the same group. State reason for your selection in each case.

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Q6
An element ‘X’ belongs to 3rd period and group 17 of the periodic table. State its(i) electronic configuration, (ii) valency. Justify your answer with reasoning.

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Q7
(a) State the role of placenta in the development of embryo.

(b) What happens when the egg is not fertilised?

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Q8
To construct ray diagram we use two light rays which are so chosen that it is easy to know their directions after reflection from the mirror. List these two rays and state the path of these rays after reflection. Use these rays to locate the image of an object placed between centre of curvature and focus of a concave mirror.

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Q9
(a) Draw a labelled ray diagram to illustrate the dispersion of a narrow beam of white light when it passes through a glass prism. (b) A star appears slightly higher (above) than its actual position in the sky. Illustrate it with the help of a labelled diagram.

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Q10
A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 24 cm. The distance of the object from the lens is 16 cm. Find the position, size and nature of the image formed, using the lens formula.

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2012

Q1
Write the name and formula of the second member of the carbon compounds having functional group—OH.

Solution

Q2
State one function of iris in human eye.

Solution

Q3
What happens when higher energy ultraviolet radiations act on the oxygen at the higher level of the atmosphere?

Solution

Q4
In a food chain, if 10,000 joules of energy is available to the producer, how much energy will be available to the secondary consumer to transfer it to the tertiary consumer?

Solution

Q5
Choose from the following: 6C, 80, 10Ne, 11Na, 14Si (i) Elements that should be in the same period. (ii) Elements that should be in the same group. State reason for your selection in each case.

Solution

Q6
An element ‘X’ belongs to 3rd period and group 17 of the periodic table. State its(i) electronic configuration, (ii) valency. Justify your answer with reasoning.

Solution

Q7
(a) State the role of placenta in the development of embryo.

(b) What happens when the egg is not fertilised?

Solution

Solution

Q9
(a) Draw a labelled ray diagram to illustrate the dispersion of a narrow beam of white light when it passes through a glass prism. (b) A star appears slightly higher (above) than its actual position in the sky. Illustrate it with the help of a labelled diagram.

Solution

Q10
A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 24 cm. The distance of the object from the lens is 16 cm. Find the position, size and nature of the image formed, using the lens formula.

Solution

Subjects

2012

Q1 Write the name and formula of the second member of the carbon compounds having functional group—OH.

Solution

Q2 State one function of iris in human eye.

Solution

Q3 What happens when higher energy ultraviolet radiations act on the oxygen at the higher level of the atmosphere?

Solution

Q4 In a food chain, if 10,000 joules of energy is available to the producer, how much energy will be available to the secondary consumer to transfer it to the tertiary consumer?

Solution

Q5 Choose from the following: 6C, 80, 10Ne, 11Na, 14Si (i) Elements that should be in the same period. (ii) Elements that should be in the same group. State reason for your selection in each case.

Solution

Q6 An element ‘X’ belongs to 3rd period and group 17 of the periodic table. State its(i) electronic configuration, (ii) valency. Justify your answer with reasoning.

Solution

Q7 (a) State the role of placenta in the development of embryo. (b) What happens when the egg is not fertilised?

Solution

Solution

Q9 (a) Draw a labelled ray diagram to illustrate the dispersion of a narrow beam of white light when it passes through a glass prism. (b) A star appears slightly higher (above) than its actual position in the sky. Illustrate it with the help of a labelled diagram.

Solution

Q10 A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 24 cm. The distance of the object from the lens is 16 cm. Find the position, size and nature of the image formed, using the lens formula.

Solution

Subjects

Q1
Write the name and formula of the second member of the carbon compounds having functional group—OH.

Q2
State one function of iris in human eye.

Q3
What happens when higher energy ultraviolet radiations act on the oxygen at the higher level of the atmosphere?

Q4
In a food chain, if 10,000 joules of energy is available to the producer, how much energy will be available to the secondary consumer to transfer it to the tertiary consumer?

Q5
Choose from the following: 6C, 80, 10Ne, 11Na, 14Si (i) Elements that should be in the same period. (ii) Elements that should be in the same group. State reason for your selection in each case.

Q6
An element ‘X’ belongs to 3rd period and group 17 of the periodic table. State its(i) electronic configuration, (ii) valency. Justify your answer with reasoning.

Q7
(a) State the role of placenta in the development of embryo.

(b) What happens when the egg is not fertilised?

Q9
(a) Draw a labelled ray diagram to illustrate the dispersion of a narrow beam of white light when it passes through a glass prism. (b) A star appears slightly higher (above) than its actual position in the sky. Illustrate it with the help of a labelled diagram.

Q10
A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 24 cm. The distance of the object from the lens is 16 cm. Find the position, size and nature of the image formed, using the lens formula.