Monday, October 8, 2018

CBSE PORTAL : CBSE Class-10 Exam 2018 : All India Scheme Question Paper, Science

CBSE PORTAL : CBSE Class-10 Exam 2018 : All India Scheme Question Paper, Science

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CBSE Class-10 Exam 2018 : All India Scheme Question Paper, Science

Posted: 08 Oct 2018 05:15 AM PDT


CBSE Class-10 Exam 2018 : All India Scheme

Question Paper Science


CBSE Class-10 Exam 2018 :  Science (Set -1)

General Instructions :

(i) The question paper comprises two Sections, A and B. You are to attempt both the sections.

(ii) All questions are compulsory.

(iii) There is no choice in any of the questions.

(iv) All questions of Section A and all questions of Section B are to be attempted separately.

(v) Question numbers 1 to 3 in Section A are one-mark questions. These are to be answered in one word or in one sentence.

(vi) Question numbers 4 to 6 in Section A are two-marks questions. These are to be answered in about 30 words each.

(vii) Question numbers 7 to 18 in Section A are three-marks questions. These are to be answered in about 50 words each.

(viii) Question numbers 19 to 24 in Section A are five-marks questions. These

are to be answered in about 70 words each.

(ix) Question numbers 25 to 33 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.

(x) Question numbers 34 to 36 in Section B are two-marks questions based on

practical skills. These are to be answered in brief.

SECTION A

1. A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F1  progeny ?
2. Write the energy conversion that takes place in a hydropower plant.
3. A compound ‘X’ on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound ‘Y’. ‘X’ also reacts with sodium metal to evolve a colourless gas ‘Z’. Identify ‘X’, ‘Y’ and ‘Z’. Write the equation of the chemical reaction of formation of ‘Y’ and also write the role of sulphuric acid in the reaction.
4. (a) Name one gustatory receptor and one olfactory receptor present in human beings.
 (b) Write a and b in the given flow chart of neuron through which information travels as an electrical impulse.

Dendrite→ a →b→ End point of Neuron

5. If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it ? Draw a labelled ray diagram to support your answer.
6. Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity. 


Click Here to Download Set -1


 

CBSE Class-10 Exam 2018 :  Science (Set -2)

1. Write the energy conversion that takes place in a hydropower plant.
2. A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F1  progeny ?
3.(a) Name one gustatory receptor and one olfactory receptor present in human beings.
 (b) Write a and b in the given flow chart of neuron through which information travels as an electrical impulse. Dendrite →a →b → End point of Neuron
4. If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it ? Draw a labelled ray diagram to support your answer. 


Click Here to Download Set -2


CBSE Class-10 Exam 2018 :  Science (Set -3)

General Instructions :

(i) The question paper comprises two Sections, A and B. You are to attempt both the sections.

(ii) All questions are compulsory.

(iii) There is no choice in any of the questions.

(iv) All questions of Section A and all questions of Section B are to be attempted separately.

(v) Question numbers 1 to 3 in Section A are one-mark questions. These are to be answered in one word or in one sentence.

(vi) Question numbers 4 to 6 in Section A are two-marks questions. These are to be answered in about 30 words each.

(vii) Question numbers 7 to 18 in Section A are three-marks questions. These are to be answered in about 50 words each.

(viii) Question numbers 19 to 24 in Section A are five-marks questions. These are to be answered in about 70 words each.

(ix) Question numbers 25 to 33 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.

(x) Question numbers 34 to 36 in Section B are two-marks questions based on practical skills. These are to be answered in brief. 


Click Here to Download Set -3


 

CBSE Class-10 Exam 2018 :  Science (Set -4)

General Instructions :

(i) The question paper comprises two Sections, A and B. You are to attempt both the sections.

(ii) All questions are compulsory.

(iii) There is no choice in any of the questions.

(iv) All questions of Section A and all questions of Section B are to be attempted separately.

(v) Question numbers 1 to 3 in Section A are one-mark questions. These are to be answered in one word or in one sentence.

(vi) Question numbers 4 to 6 in Section A are two-marks questions. These are to be answered in about 30 words each.

(vii) Question numbers 7 to 18 in Section A are three-marks questions. These are to be answered in about 50 words each.

(viii) Question numbers 19 to 24 in Section A are five-marks questions. These are to be answered in about 70 words each.

(ix) Question numbers 25 to 33 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.

(x) Question numbers 34 to 36 in Section B are two-marks questions based on practical skills. These are to be answered in brief. 

SECTION A

1.  Name the phenomenon responsible for the twinkling of stars in the sky.
2.  Why does the sky appear dark instead of blue to an astronaut ?
3.  Which compounds are called (i) alkanes, (ii) alkenes and (iii) alkynes ? Which of them is C4H10 ?
4.  Name the nuclear reaction by which nuclear energy is generated in a nuclear reactor. Write the name of the element which is used as a fuel in these reactors. List two advantages of using nuclear energy in place of fossil fuels.
5.  What are decomposers ? State their role in our biotic environment. 


Click Here to Download Set -4


 

Courtesy: CBSE

(Download) CBSE: Class XII English Elective Question Paper - 2018

Posted: 08 Oct 2018 05:14 AM PDT


Question Papers For Board Examinations 2018

Class – XII

Subject – English (Elective)


Subject :- English (Elective)

Class : XII

Year : 2018

The Question paper is divided into three sections :
Section A — Reading 20 marks
Section B — Writing and Grammar 40 marks
Section C — Literature 40 marks
General Instructions :
(i) All the questions are compulsory.
(ii) You may attempt any section at a time.
(iii) All questions of that particular section must be attempted in the correct order.

SECTION A
(Reading) 20

1. Read the passage given below : 10
What’s lost as handwriting fades ?

1 Psychologists and neuroscientists say that handwriting has not yet lost its importance. New evidence suggests that the links between handwriting and broader educational development are very close.
2 Children not only learn to read more quickly when they first learn to write by hand, but they also remain better able to generate ideas and retain information. In other words it’s not just what we write that matters -but how.
3 According to psychologist Stanislas Dehaene, ‘‘When a child writes,the brain reacts in a unique manner. The action of writing automatically triggers an activity in the brain. This activity recognizes what is the written word, which makes learning easier.’’ 
4 A 2012 study lent support to that view. Children who had not yet learnt to read and write were presented with a letter or a shape on an index card and were asked to produce it in one of three ways : trace the image on a sheet with a dotted outline, draw it on a blank white sheet, or type it on a computer. They were then placed in a brain scanner and shown the image again.
5 The researchers found that when children had drawn the letter freehand, they exhibited increased activity in areas of the brain that are activated in adults when they read and write. By contrast, children who typed or traced the letter showed no such effect. The activation was significantly weaker.
6 The effect goes beyond letter recognition. A study that followed children in grades two through five demonstrated that printing, cursive writing and typing on a keyboard are all associated with separate brain activities. When the children composed text by hand, they consistently produced more words more quickly than they did on a keyboard, and expressed more ideas. And brain imaging suggested that the connection between writing and idea generation went further. When these children were asked to come up with ideas for a competition, the ones with better handwriting exhibited greater mental activity in areas associated with working memory, and increased overall activation in the reading and writing networks.
7 More studies have reported that in both laboratory settings and classrooms, students learn better when they take notes by hand than when they type on a keyboard. Latest research suggests that writing by hand allows the student to process a lecture’s contents and reframe it.
8 Not every expert is persuaded that the long-term benefits of handwriting are all that significant. Still, one expert, Harold Bloom, says, the new research is, at least, thought provoking. ‘‘With handwriting, the very act of putting it down forces you to focus on what is important,’’ he said. ‘‘May be it helps you think better.’’

1.1 On the basis of your understanding of the above passage, answer the following questions very briefly : 1x6=6

(a) What happens when children learn to write by hand ?
(b) What is the reaction of the brain when a person writes ?
(c) What is the change when a person draws freehand ?
(d) Which children perform better in competitions ?
(e) What is the advantage of taking down notes by hand ?
(f) According to Bloom, how does handwriting help a person get greater clarity of thought ?

1.2 Choose the meanings of the words given below from the given options : 1x4=4
(a) Suggests (para 1)
(i) conveys
(ii) denies
(iii) accepts
(iv) advises

Click Here To Download Full Paper I

Click Here To Download Full Paper II

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