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Class 6	Science Mathematics Social Science	English Hindi Computer
Class 7	Science Mathematics Social Science	English Hindi Computer
Class 8	Science Mathematics Social Science	English Hindi Computer
Class 9	Science Mathematics Social Science	English Hindi Computer
Class 10	Science Math Social Science	English Hindi Computer
Class 11	Physics Chemistry Biology	Mathematics English Economics
Class 12	Physics Chemistry Biology	Mathematics English Economics
Class 5	EVS
College Entrance	Jamia Millia Islamia Aligarh Muslim University Banaras Hindu University

2012

Q1
Write the name and formula of the first member of the carbon compounds having functional group—CHO

Solution

Q2
State one role of ciliary muscles in the human eye.

Solution

Q3
Write the name and formula of a molecule made up of three atoms of oxygen.

Solution

Q4
What is the colour of the clear sky during day-time? Give reason for it.

Solution

Q5
Why do all the elements of the (a) same group have similar properties, (b) same period have different properties?

Solution

Q6
An element E has following electronic configuration: 2,8,6
(a) To which group of the periodic table does element E belong?
(b) To which period of the periodic table does element E belong?
(c) State the number of valence electrons present in element E.
(d) State the valency of the element E.

Solution

Q7
Name the oxidising agent used for the conversion of ethanol to ethanoic acid. Distinguish between ethanol and ethanoic acid on the basis of (i) litmus test, (ii) reaction with sodium hydrogen carbonate.

Solution

Q8
State the meaning of inherited traits and acquired traits. Which of the two is not passed on to the next generation? Explain with the help of an example.

Solution

Q9
A 5 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 12 cm. The distance of the object from the lens is 8 cm. Using the lens forumla find the position, size and nature of the image formed.

Solution

Subjects

2012

Q1 Write the name and formula of the first member of the carbon compounds having functional group—CHO

Solution

Q2 State one role of ciliary muscles in the human eye.

Solution

Q3 Write the name and formula of a molecule made up of three atoms of oxygen.

Solution

Q4 What is the colour of the clear sky during day-time? Give reason for it.

Solution

Q5 Why do all the elements of the (a) same group have similar properties, (b) same period have different properties?

Solution

Q6 An element E has following electronic configuration: 2,8,6 (a) To which group of the periodic table does element E belong? (b) To which period of the periodic table does element E belong? (c) State the number of valence electrons present in element E. (d) State the valency of the element E.

Solution

Q7 Name the oxidising agent used for the conversion of ethanol to ethanoic acid. Distinguish between ethanol and ethanoic acid on the basis of (i) litmus test, (ii) reaction with sodium hydrogen carbonate.

Solution

Q8 State the meaning of inherited traits and acquired traits. Which of the two is not passed on to the next generation? Explain with the help of an example.

Solution

Q9 A 5 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 12 cm. The distance of the object from the lens is 8 cm. Using the lens forumla find the position, size and nature of the image formed.

Solution

Subjects

Q1
Write the name and formula of the first member of the carbon compounds having functional group—CHO

Q2
State one role of ciliary muscles in the human eye.

Q3
Write the name and formula of a molecule made up of three atoms of oxygen.

Q4
What is the colour of the clear sky during day-time? Give reason for it.

Q5
Why do all the elements of the (a) same group have similar properties, (b) same period have different properties?

Q6
An element E has following electronic configuration: 2,8,6
(a) To which group of the periodic table does element E belong?
(b) To which period of the periodic table does element E belong?
(c) State the number of valence electrons present in element E.
(d) State the valency of the element E.

Q7
Name the oxidising agent used for the conversion of ethanol to ethanoic acid. Distinguish between ethanol and ethanoic acid on the basis of (i) litmus test, (ii) reaction with sodium hydrogen carbonate.

Q8
State the meaning of inherited traits and acquired traits. Which of the two is not passed on to the next generation? Explain with the help of an example.

Q9
A 5 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 12 cm. The distance of the object from the lens is 8 cm. Using the lens forumla find the position, size and nature of the image formed.