Board Paper of Class 10 2012 Science All India(SET 3) - 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 over all choice. However internal choice has been provided in all the three question of five marks category. Only one option in such question is to be attempt.
(iv) All questions of section A and all questions of section B are to be attempted separately.
(v) Questions numbers 1 to 4 in section A are one mark questions. These are to be answered in one word or one sentence.
(vi) Question numbers 5 to 13 are two mark questions, to be answered in about 30 words each.
(vii) Question numbers 14 to 22 are three mark questions to be answered in about 50 words each.
(viii) Question numbers 23 to 25 are five mark questions, to be answered in about 70 word each.
(ix) Question numbers 26 to 41 in section B are multiple choice questions based on practical skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you.
- Question 1
Write the name and formula of the first member of the carbon compounds having functional group − CHO.
VIEW SOLUTION
- Question 2
State one role of ciliary muscles in the human eye.
VIEW SOLUTION
- Question 3
Write the name and formula of a molecule made up of three atoms of oxygen.
VIEW SOLUTION
- Question 4
Name two decomposers operating in our ecosystem.
VIEW SOLUTION
- Question 5
Why do all the elements of the (a) same group have similar properties, (b) same period have different properties?
VIEW SOLUTION
- Question 6
An element E has following electronic configuration:
K
L
M
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.
VIEW SOLUTION
- Question 7
Why is vegetative propagation practiced for growing some types of plant? List two plants which are grown by this method.
VIEW SOLUTION
- Question 8
State the role of placenta in the development of embryo.
VIEW SOLUTION
- Question 9
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.
VIEW SOLUTION
- Question 10
What is the colour of the clear sky during day time? Give reason for it.
VIEW SOLUTION
- Question 11
Draw a labeled ray diagram to illustrate the dispersion of a narrow beam of white light when it passes through a glass prism.
VIEW SOLUTION
- Question 12
List the products of combustion of fossil fuels. What are their adverse effects on the environment?
VIEW SOLUTION
- Question 13
List three problems which arise due to construction of big dams. Suggest a solution for these problems.
VIEW SOLUTION
- Question 14
State the meaning of inherited traits and acquired traits. Which of the two is not passes on the next generation? Explain with the help of an example.
VIEW SOLUTION
- Question 15
How are fossils formed? Describe, in brief, two methods of determining the age of fossils.
VIEW SOLUTION
- Question 16
If we pure-bred tall (dominant) pea plant with pure-bred dwarf (recessive) pea plant we will get pea plants of F1 generation. If we now self-cross the pea plant of F1 generation, then we obtain pea plants of F2 generation.
(a) What do the plants of F2 generation look like?
(b) State the ratio of tall plants to dwarf plants in F2 generation.
(c) State the type of plants not found in F1 generation but appeared in F2 generation, mentioning the reason for the same.
VIEW SOLUTION
- Question 17
A 5 cm tall object is placed perpendicular to the principle axis of a convex lens of focal length 12 cm. The distance of the object from the lens is 8 cm. Using the lens formula, find the position, size and nature of the image formed.
VIEW SOLUTION
- Question 18
State the types of mirrors used for (i) headlights and (ii) rear view mirror, in cars and motorcycles. Give to justify your answer in each case.
VIEW SOLUTION
- Question 19
An old man cannot see objects closer than 1 m from the eye clearly. Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagram for the (i) defect of vision and also (ii) for its correction.
VIEW SOLUTION
- Question 20
Name the oxidizing 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.
VIEW SOLUTION
- Question 21
List and explain in brief three methods of contraception.
VIEW SOLUTION
- Question 22
Na, Mg and Al are the elements having one, two and three valence electrons respectively. Which of these elements (i) has the largest atomic radius, (ii) is least reactive? Justify your answer stating reason for each.
VIEW SOLUTION
- Question 23
List the new Cartesian sign convention for reflection of light by spherical mirror. Draw a diagram and apply these conventions for calculating the focal length and nature of spherical mirror which forms a 1/3 times magnified virtual image of an object placed 18 cm in front of it.
OR
With the help of a ray diagram, state what is meant by refraction of light. State Snell’s law for refraction of light and also express it mathematically.
The refractive index of air with respect to glass is 2/3 and the refractive index of water with respect to air is 4/3. If the speed of light in glass is 2 × 108 m/s, find the speed of light in (a) air, (b) water.
VIEW SOLUTION
- Question 24
What are hydrocarbons? Write the name and general formula of (i) saturated hydrocarbons, (ii) unsaturated hydrocarbons, and draw the structure of one hydrocarbon of each type. How can an unsaturated hydrocarbon be made saturated?
OR
What are detergents chemically? List two merits and two demerits of using detergents for cleansing. State the reason for the suitability of detergents for washing, event in the case of water having calcium and magnesium ions.
VIEW SOLUTION
- Question 25
Distinguish between unisexual and bisexual flowers giving one example of each. Draw a diagram showing process of germination of pollen grains on stigma and label the following parts:
(a) Female germ cell
(b) Male germ cell
(c) Ovary
OR
Draw a diagram of human female reproductive system and label the part.
(i) That produces eggs.
(ii) Where fusion of egg and sperm take place.
(iii) Where zygote is implanted.
What happens to human egg when it is not fertilized?
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 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 2008 Science Delhi(SET 1) - 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