Though, the dates for CBSE Class 10 Board Exams 2018, are still to be announced, but the preparations for the exams have already started rising to the peak. Students are busy with wrapping up their syllabus and preparing it as well. With a few months left for the exams to commence, Students must adopt a well formed startegy, so as to end their preparations much before the exams start and spare enough time for revisions. Getting good grades in class 10th exams is of utmost importance to get further admission in any prestigious school.
This is the most crucial time when students should focus on smart preparation in less time, which is possible only with effective revision plans. One of the most prominent ways of revising the syllabus before the main exam, is solving the previous year solved papers which will help to understand the exam pattern and marking trends. Moreover, it will give a clear overview of the types of questions asked in the board exam. By solving previous years’ question papers, students will get to have a fair idea of the important topics which they should pick to prepare for the questions carrying different weightage.
Jagranjosh here brings a collection of Class 10 Science Last 5+1 years’ Short Questions that carry three marks each, to help the students track their performance and get a firm grip over the type of questions that are probably going to be asked in the upcoming board exam.
As per the latest CBSE Exam Pattern, in CBSE Class 10 Science Paper, 12 questions (from Q. no. 7 to 18) in Section- A are three marks questions. These are to be answered in about 50 words each.
Some sample questions from the collection of previous years’ short questions are:
Q. No chemical relation takes place when granules of a solid A, are mixed with the powder of another solid B. However, when the mixture is heated, a reaction takes place between its components. One of the products, C, is metal and settles down in the molten state while the other product D, floats over it. It was observed that the reaction is highly exothermic.
(i) Based on the given information make an assumption about A and B and write a chemical equation for the chemical reaction indicating the conditions of reaction. Physical state of reactants and products and thermal status of reaction.
(ii) Mention any two types of reactions under which above chemical reaction can be classified.
Q. Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electronic shells but different number of electrons in their outermost shell. It was found that elements A and G combine to form an ionic compound. This compound is added in a small amount to almost all vegetable dishes during cooking. Oxides of elements A and B are basic in nature while those of E and F are acidic. The oxide of D is almost neutral. Based on the above information answer the following questions:
(i) To which group or period of the periodic table do the listed elements belong?
(ii) What would be the nature of compound formed by a combination of elements B and F?
(iii) Which two of these elements could definitely be metals?
(iv) Which one of the eight elements is most likely to be found in gaseous state at room temperature?
(v) If the number of electrons in the outermost shell of elemnents C and G are 3 and 7 respectively, write the formula of the compound formed by the combination of C and G.
Q. Write the names and symbols of two most reactive metals belonging to group I of the periodic table. Explain by drawing electronic structure how either one of the two metals reacts with a halogen. By what name is the bond formed between these elements known as and what is the class of the compound so formed named as? State any four physical properties of such compounds.
Q. On the basis of electronic configuration, how will you identify the first and the last element of a period?
Q. State the two laws of reflection of light.
Q. The stars appear higher from horizon than they actually are. Explain why it is so.
Q. Explain why the planets do not twinkle, but the stars twinkle.
Q. Write any two differences between binary fission and multiple fission in a tabular form as observed in cells of organisms.
Q. Why is DNA copying an essential part of the process of reproduction?
Q. Explain the terms:
(ii) Natural selection