Board Paper of Class 10 2014 Science Delhi(SET 1) - Solutions
General Instructions:
(i) The question paper comprises of two Sections, A and B. You are to attempt both the sections.
(ii) All questions are compulsory.
(iii) All question of Section-A and all questions of Section-B are to be attempted separately.
(iv) Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in one word or in one sentence.
(v) Question numbers 4 to 7 in Sections-A are two marks questions. These are to be answered in about 30 words each.
(vi) Question number 8 to 19 in Section-A are three marks questions. These are to be answered in about 50 words each.
(vii) Question numbers 20 to 24 in Section-A are five marks questions. These are to be answered in about 70 words each.
(viii) Question numbers 25 to 42 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.
(i) The question paper comprises of two Sections, A and B. You are to attempt both the sections.
(ii) All questions are compulsory.
(iii) All question of Section-A and all questions of Section-B are to be attempted separately.
(iv) Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in one word or in one sentence.
(v) Question numbers 4 to 7 in Sections-A are two marks questions. These are to be answered in about 30 words each.
(vi) Question number 8 to 19 in Section-A are three marks questions. These are to be answered in about 50 words each.
(vii) Question numbers 20 to 24 in Section-A are five marks questions. These are to be answered in about 70 words each.
(viii) Question numbers 25 to 42 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 number of vertical columns in the modern periodic table. What are these columns called? VIEW SOLUTION
- Question 2
Give the respective scientific terms used for studying :
(i) the mechanism by which variations are created and inherited and
(ii) the development of new type of organisms from the existing ones. VIEW SOLUTION
- Question 3
Water is a valuable resource. List two ways, that you would suggest every family member to save this resource. VIEW SOLUTION
- Question 4
List four advantages of vegetative propagation. VIEW SOLUTION
- Question 5
Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray which is directed parallel to the principal axis of a convex mirror. Mark on it the angle of incident and the angle of reflection. VIEW SOLUTION
- Question 6
Why is Government of India imposing a ban on the use of polythene bags? Suggest two alternatives to these bags and explain how this ban is likely to improve the environment. VIEW SOLUTION
- Question 7
What is meant by biodiversity ? List two advantages of conserving forest and wild life. VIEW SOLUTION
- Question 8
State the meaning of functional group in a carbon compound. Write the functional group present in (i) ethanol and (ii) ethanoic acid and also draw their structures. VIEW SOLUTION
- Question 9
Write the name and general formula of a chain of hydrocarbons in which an addition reaction with hydrogen can take place. Stating the essential conditions required for an addition reaction to occur, write the chemical equation giving the name of the reactant and the product of such a reaction. VIEW SOLUTION
- Question 10
Based on the group valency of elements state the formula lot the following giving justification for each :
(i) Oxides of 1st group elements,
(ii) Halides of the elements of group 13, and
(iii) Compounds formed when an element of group 2 combines with, an element of group 16. VIEW SOLUTION
- Question 11
(a) Define the following terms :
(i) Valency (ii) Atomic size
(b) How do the valency and the atomic size of the elements vary while going from left to right along a period in the modern periodic table? VIEW SOLUTION
- Question 12
Draw diagrams to explain the regeneration that takes place in each of the body parts of Planaria when its body is out into pieces. Name any other organism in which a similar process can be observed. VIEW SOLUTION
- Question 13
List any four methods of contraception used by humans. How does their use have a direct effect on the health and prosperity of a family? VIEW SOLUTION
- Question 14
(a) Give the evidence that the birds have evolved from reptiles.
(b) Insects, octopus, Planaria and vertebrates possess eyes. Can we group these animals together on the basis of eyes that they possess ? Justify your answer giving reason. VIEW SOLUTION
- Question 15
A cross was made between pure breeding pea plants one with round and green seeds and the other with wrinkled and yellow seeds.
(a) Write the phenotype of F1 progeny. Give reason for your answer.
(b) Write the different types of F2 progeny obtained along with their ration when F1 progeny was selfed. VIEW SOLUTION
- Question 16
A spherical mirror produces an image of magnification −1 on a screen placed at a distance of 50 cm from the mirror.
(a) Write the type of mirror.
(b) Find the distance of the image from the object.
(c) What is the focal length of the mirror?
(d) Draw the ray diagram to show the image formation in this case. VIEW SOLUTION
- Question 17
State the laws of refraction of light. If the speed of light in vacuum is 3 × 108 ms−1, find the speed of light in a medium of absolute refractive index 1.5. VIEW SOLUTION
- Question 18
Explain giving reason why the sky appears blue to an observer from the surface of the earth? What will the colour of the sky be for an astronaut staying in the international space station orbiting the earth? Justify your answer giving reason. VIEW SOLUTION
- Question 19
"Our food grains such as wheat and rice, the vegetables and fruits and even meat are found to contain varying amounts of pesticide residues." State the reason to explain how and why it happens? VIEW SOLUTION
- Question 20
State the reason why carbon can neither form C4+ cations nor C4− anions but forms covalent compound. Also state the reason to explain why covalent compounds:
(i) are bad conductors of electricity.
(ii) have low melting and boiling points. VIEW SOLUTION
- Question 21
(a) Give one example each of a unisexual and a bisexual flower.
(b) Mention the changes a flower undergoes after fertilisation.
(c) How does the amount of DNA remain constant though each new generation is a combination of DNA copies of two individuals? VIEW SOLUTION
- Question 22
(a) Name the respective part of human female reproductive system:
(i) that produces eggs,
(ii) where fusion of eggs and sperm takes place, and
(iii) where zygote gets implanted.
(b) Describe in brief what happens to the zygote after it gets implanted. VIEW SOLUTION
- Question 23
A student wants to project the image of a candle flame on the walls of school laboratory by using a lens:
(a) Which type of lens should be use and why?
(b) At what distance in terms of focal length 'F' of the lens should be place the candle flame so as to get (i) a magnified, and (ii) a diminished image respectively on the wall?
(c) Draw ray diagram to show the formation of the image in each case? VIEW SOLUTION
- Question 24
(a) List three common refractive defects of vision. Suggest the way of correcting these defects.
(b) About 45 lac people in the developing countries are suffering from corneal blindness. About 30 lac children below the age of 12 years suffering from this defect can be cured by replacing the defective cornea with the cornea of a donated eye. How and why can students of your age involve themselves to create awareness about this fact among people? VIEW SOLUTION
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