Board Paper of Class 10 2008 Science Delhi(SET 1) - Solutions
(i) The question paper comprises of two sections, A and B. You are to attempt both the sections
(ii) All questions are compulsory
(iii) There is no overall choice. However, internal choice has been provided in all the three questions of five marks category. Only one option in such questions is to be attempted
(iv) All questions of Section A and all questions of Section B are to be attempted separately
(v) Questions number 1 to 6 in Section A and 17 to 19 in Section B are short answer type questions. These questions carry one mark each
(vi) Questions number 7 to 10 in Section A and 20 to 24 in Section B are short answer type questions and carry two marks each
(vii) Questions number 11 to 14 in Section A and 25 and 26 in Section B are also short answer type questions and carry three marks each
(viii) Questions number 15 and 16 in section A and question number 27 in section B are long answer type questions and carry five marks each
- Question 1
Balance the following chemical equation:
VIEW SOLUTION
- Question 2
Why is respiration considered an exothermic process?
VIEW SOLUTION
- Question 3
How does the flow of acid rain water into a river make the survival of aquatic life in the river difficult?
VIEW SOLUTION
- Question 4
Draw the following diagram in your answer book and show the formation of image of the object AB with the help of suitable rays.
VIEW SOLUTION
- Question 5
Why is the series arrangement not used for connecting domestic electric appliances in a circuit?
VIEW SOLUTION
- Question 6
Out of 60 W and 40 W lamps, which one has a higher electrical resistance when in use?
VIEW SOLUTION
- Question 7
Write the chemical formula for washing soda. How may it be obtained from baking soda? Name an industrial use of washing soda other than washing clothes.
VIEW SOLUTION
- Question 8
Give an example of a decomposition reaction. Describe an activity to illustrate such a reaction by heating.
VIEW SOLUTION
- Question 9
Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed:
(a) at 2F1.
(b) between F1 and the optical centre O of lens.
VIEW SOLUTION
- Question 10
What is meant by the term, ‘magnetic field’? Why does a compass needle show deflection when brought near a bar magnet?
VIEW SOLUTION
- Question 11
(a) Why are covalent compounds generally poor conductors of electricity?
(b) Name the following compound:
(c) Name the gas evolved when ethanoic acid is added to sodium carbonate. How would you prove the presence of this gas?
VIEW SOLUTION
- Question 12
(a) What are amphoteric oxides? Choose the amphoteric oxides from amongst the following oxides:
Na2O, ZnO, Al2O3, CO2, H2O
(b) Why is it that non-metals do not displace hydrogen from dilute acids?
VIEW SOLUTION
- Question 13
Two lamps, one related 60 W at 220 W at 220 V and the other 40 W at 220 V, are connected in parallel to the electric supply at 220 V.
(a) Draw a circuit diagram to show the connections.
(b) Calculate the current drawn from the electric supply.
(c) Calculate the total energy consumed by the two lamps together when they operate for one hour.
VIEW SOLUTION
- Question 14
(a) Distinguish between the terms “overloading and short circuiting” as used in domestic circuits.
(b) Name the device used to protect the electric circuits from overloading and short circuit.
VIEW SOLUTION
- Question 15
On the basis of Mendeleev’s Periodic Table given below, answer the questions that follow the table:
(a) Name the element which is in
(i) Ist group and 3rd period.
(ii) VIIth group and 2nd period.
(b) Suggest the formula for the following:
(i) oxide of nitrogen
(ii) hydride of oxygen
(c) In group VIII of the Periodic Table, why does cobalt with atomic mass 58.93 appear before nickel having atomic mass 58.71?
(d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his Periodic Table?
(e) Using atomic masses of Li, Na and K, find the average atomic mass of Li anf K and compare it wit the atomic mass of Na. State the conclusion drawn from this activity.
(OR)
(a) Why do we classify elements?
(b) What were the two criteria used by Mendeleev in creating his Periodic Table?
(c) Why did Mendeleev leave some gaps in his Periodic Table?
(d) In Mendeleev’s Periodic Table, why was there no mention of Noble gases like Helium, Neon and Argon?
(e) Would you place the two isotopes of chlorine, Cl-35 and Cl-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify you answer.
VIEW SOLUTION
- Question 16
(a) What is meant by dispersion of white light? Describe the formation of rainbow in the sky with the help of a diagram.
(b) What is hypermetropia? Draw ray diagrams to show the image formation of an
object by:
(i) Hypermetropic eye.
(ii) Correction made with a suitable lens for hypermetropic eye.
OR
(a) Give reason for the following:
(i) Colour of the clear sky is blue.
(ii) The sun can be seen about two minutes before actual sunrise.
(iii) We cannot see an object clearly if it is placed very close to the eyes.
(b) What is Presbyopia? Write two causes of this defect.
VIEW SOLUTION
-
Board Paper of Class 10 2023 Science Delhi(Set 1) - Solutions
-
Board Paper of Class 10 2023 Science Delhi(Set 2) - Solutions
-
Board Paper of Class 10 2023 Science Delhi(Set 3) - Solutions
-
Board Paper of Class 10 Science Term-II 2022 Delhi(Set 1) - Solutions
-
Board Paper of Class 10 Science Term-II 2022 Delhi(Set 2) - Solutions
-
Board Paper of Class 10 Science Term-II 2022 Delhi(Set 3) - Solutions
-
Board Paper of Class 10 Science Term-I 2021 Delhi(Set 4) - Solutions
-
Board Paper of Class 10 2020 Science Delhi(Set 1) - Solutions
-
Board Paper of Class 10 2020 Science Delhi(Set 2) - Solutions
-
Board Paper of Class 10 2020 Science Delhi(Set 3) - Solutions
-
Board Paper of Class 10 2019 Science Delhi(Set 1) - Solutions
-
Board Paper of Class 10 2019 Science Delhi(Set 2) - Solutions
-
Board Paper of Class 10 2019 Science Delhi(Set 3) - Solutions
-
Board Paper of Class 10 2019 Science All India(Set 1) - Solutions
-
Board Paper of Class 10 2019 Science Abroad(Set 2) - Solutions
-
Board Paper of Class 10 2018 Science Delhi(SET 1) - Solutions
-
Board Paper of Class 10 2018 Science Delhi(SET 2) - Solutions
-
Board Paper of Class 10 2018 Science Delhi(SET 3) - Solutions
-
Board Paper of Class 10 2018 Science All India(SET 1) - Solutions
-
Board Paper of Class 10 2018 Science All India(SET 2) - Solutions
-
Board Paper of Class 10 2018 Science All India(SET 3) - Solutions
-
Board Paper of Class 10 2018 Science Abroad(SET 1) - Solutions
-
Board Paper of Class 10 2018 Science Abroad(SET 2) - Solutions
-
Board Paper of Class 10 2018 Science Abroad(SET 3) - Solutions
-
Board Paper of Class 10 2017 Science Delhi(SET 1) - Solutions
-
Board Paper of Class 10 2017 Science Delhi(SET 2) - Solutions
-
Board Paper of Class 10 2017 Science Delhi(SET 3) - Solutions
-
Board Paper of Class 10 2017 Science All India(SET 1) - Solutions
-
Board Paper of Class 10 2017 Science All India(SET 2) - Solutions
-
Board Paper of Class 10 2017 Science All India(SET 3) - Solutions
-
Board Paper of Class 10 2017 Science Abroad(SET 3) - Solutions
-
Board Paper of Class 10 2016 Science Delhi(SET 1) - Solutions
-
Board Paper of Class 10 2016 Science Delhi(SET 2) - Solutions
-
Board Paper of Class 10 2016 Science Delhi(SET 3) - Solutions
-
Board Paper of Class 10 2016 Science All India(SET 3) - Solutions
-
Board Paper of Class 10 2016 Science Abroad(SET 1) - Solutions
-
Board Paper of Class 10 2015 Science Delhi(SET 1) - Solutions
-
Board Paper of Class 10 2012 Science All India(SET 3) - Solutions
-
Board Paper of Class 10 2012 Science Delhi(SET 3) - Solutions
-
Board Paper of Class 10 2012 Science Delhi(SET 2) - Solutions
-
Board Paper of Class 10 2015 Science Delhi(SET 2) - Solutions
-
Board Paper of Class 10 2015 Science Delhi(SET 3) - Solutions
-
Board Paper of Class 10 2015 Science All India(SET 1) - Solutions
-
Board Paper of Class 10 2015 Science All India(SET 2) - Solutions
-
Board Paper of Class 10 2015 Science All India(SET 3) - Solutions
-
Board Paper of Class 10 2015 Science Abroad(SET 3) - Solutions
-
Board Paper of Class 10 2014 Science Delhi(SET 1) - Solutions
-
Board Paper of Class 10 2014 Science Delhi(SET 2) - Solutions
-
Board Paper of Class 10 2014 Science All India(SET 1) - Solutions
-
Board Paper of Class 10 2014 Science All India(SET 2) - Solutions
-
Board Paper of Class 10 2013 Science Delhi(SET 1) - Solutions
-
Board Paper of Class 10 2013 Science Delhi(SET 2) - Solutions
-
Board Paper of Class 10 2013 Science Delhi(SET 3) - Solutions
-
Board Paper of Class 10 2011 Science Delhi(SET 3) - Solutions
-
Board Paper of Class 10 2010 Science Delhi(SET 3) - Solutions
-
Board Paper of Class 10 2009 Science Delhi(SET 1) - Solutions
-
Board Paper of Class 10 2009 Science Delhi(SET 2) - Solutions
-
Board Paper of Class 10 2009 Science Delhi(SET 3) - Solutions
-
Board Paper of Class 10 2009 Science All India(SET 1) - Solutions
-
Board Paper of Class 10 2009 Science All India(SET 2) - Solutions
-
Board Paper of Class 10 2009 Science All India(SET 3) - Solutions
-
Board Paper of Class 10 2009 Science Delhi(SET 1) - Solutions
-
Board Paper of Class 10 2009 Science Delhi(SET 3) - Solutions
-
Board Paper of Class 10 2009 Science Abroad(SET 3) - Solutions
-
Board Paper of Class 10 2007 Science Delhi(SET 1) - Solutions
-
Board Paper of Class 10 2007 Science All India(SET 1) - Solutions
-
Board Paper of Class 10 2007 Science Abroad(SET 1) - Solutions
-
Board Paper of Class 10 2006 Science Delhi(SET 1) - Solutions
-
Board Paper of Class 10 2006 Science All India(SET 1) - Solutions
-
Board Paper of Class 10 2005 Science Delhi(SET 1) - Solutions
-
Board Paper of Class 10 2005 Science All India(SET 1) - Solutions
-
Board Paper of Class 10 2005 Science Abroad(SET 1) - Solutions