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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

2019

Q11
Based on the group valency of elements write the molecular formula of the following compounds giving justification for each:
(i) Oxide of first group elements.

Solution

Q12
Based on the group valency of elements write the molecular formula of the following compounds giving justification for each:
(ii) Halide of the elements of group thirteen, and

Solution

Q13
Based on the group valency of elements write the molecular formula of the following compounds giving justification for each:
(iii) Compound formed when an element, A of group 2 combines with an element, B of group seventeen.

Solution

Q14
Write three types of blodd vessels. Give one important feature of each.

Solution

Q15
Trace the sequence of events which occur when a bright light is focused on your eyes.

Solution

Q16
What are plant hormones? Name the plant hormones responsible for the following:
(i) Growth of stem
(ii) Promotion of cell division
(iii) Inhibition of growth
(iv) Elongation of cells

Solution

Solution

Q18
What is rainbow? Draw a labelled diagram to show the formation of a rainbow.

Solution

Q19
How can we help in reducing the problems of waste disposal? Suggest any three methods.

Solution

Q20
Define an ecosystem. Draw a block diagram to show the flow of energy in an ecosystem.

Solution

Subjects

2019

Q11 Based on the group valency of elements write the molecular formula of the following compounds giving justification for each: (i) Oxide of first group elements.

Solution

Q12 Based on the group valency of elements write the molecular formula of the following compounds giving justification for each: (ii) Halide of the elements of group thirteen, and

Solution

Q13 Based on the group valency of elements write the molecular formula of the following compounds giving justification for each: (iii) Compound formed when an element, A of group 2 combines with an element, B of group seventeen.

Solution

Q14 Write three types of blodd vessels. Give one important feature of each.

Solution

Q15 Trace the sequence of events which occur when a bright light is focused on your eyes.

Solution

Q16 What are plant hormones? Name the plant hormones responsible for the following: (i) Growth of stem (ii) Promotion of cell division (iii) Inhibition of growth (iv) Elongation of cells

Solution

Solution

Q18 What is rainbow? Draw a labelled diagram to show the formation of a rainbow.

Solution

Q19 How can we help in reducing the problems of waste disposal? Suggest any three methods.

Solution

Q20 Define an ecosystem. Draw a block diagram to show the flow of energy in an ecosystem.

Solution

Subjects

Q11
Based on the group valency of elements write the molecular formula of the following compounds giving justification for each:
(i) Oxide of first group elements.

Q12
Based on the group valency of elements write the molecular formula of the following compounds giving justification for each:
(ii) Halide of the elements of group thirteen, and

Q13
Based on the group valency of elements write the molecular formula of the following compounds giving justification for each:
(iii) Compound formed when an element, A of group 2 combines with an element, B of group seventeen.

Q14
Write three types of blodd vessels. Give one important feature of each.

Q15
Trace the sequence of events which occur when a bright light is focused on your eyes.

Q16
What are plant hormones? Name the plant hormones responsible for the following:
(i) Growth of stem
(ii) Promotion of cell division
(iii) Inhibition of growth
(iv) Elongation of cells

Q18
What is rainbow? Draw a labelled diagram to show the formation of a rainbow.

Q19
How can we help in reducing the problems of waste disposal? Suggest any three methods.

Q20
Define an ecosystem. Draw a block diagram to show the flow of energy in an ecosystem.