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10th class solved Question paper For SA2

Xth ENGLISH COMMUNICATIVE SA_II_Question Paper [61005] Download File Xth ENGLISH COMMUNICATIVE SA_II_Question Paper Solution [61005] Download File Xth ENGLISH COMMUNICATIVE SA_II__Question Paper [2018] Download File Xth ENGLISH COMMUNICATIVE SA_II_Question Paper Solution [2018] Download File 10th Sample Paper for Sanskrit Set-01 Download File 10th Sample Paper for Sanskrit Set-01[Solution] Download File 10th Sample Paper for Sanskrit Set-02 Download File 10th Sample Paper for Sanskrit Set-02[Solution] Download File Xth SAMPLE PAPER SOCIAL SC. SOLVED 2014-1 Download File Xth SAMPLE PAPER SOCIAL SC. SOLVED 2014-2 Download File 10th Maths Solved Sample Paper 2014 - 1 Download File

9th Natural Resources-Questions from recent Board Exam with answer

Question: Why plants do not utilize nitrogen directly from atmosphere? Ans. Most of the plants cannot utilise nitrogen directly from the atmosphere. They use nitrogen only when it is converted into nitrates and nitrites by the process nitrogen fixation. Question: Name the substance that reduces the amount of dissolved oxygen in water. Ans. Excessive growth of phytoplanktons reduces dissolved oxygen level in water Question: Name the organisms found to be very sensitive to the levels of contaminants like sulphur dioxide in the air. Ans. Lichens Question: What do you understand by the term ‘Natural resources’? Ans. Natural resources are the variety of substances that human beings get from the nature to meet their basic needs. Question: What is strip-cropping? Ans. Strip-cropping is the planting of crops in rows or strips to check flow of water. It is practiced in the sloping areas of hills to check soil erosion Question: What is greenhouse effect? How is it caused? Ans. Greenho

CBSE X Mathematics Sample Paper -2015

Science Sample Paper -2015 Section A 1. If the equation kx2+ 4x+ k=0 has two equal roots, then (a) k = ±2 (b) k = 0 (c) k = 2 (d) none of these 2. If the sum of n terms of an A.P., is 2n2 +4n, then its nth term is (a) 4n + 2 (b) 4n + 5 (c) 10n - 4 (d) none of these 3. If tangents TA and TB from a point T to a circle with center O are inclined to each other at an angle of 70° then <TOA is equal to (a)80° (b) 70° (c) 55° (d) 50° 4. To divide a line segment AB in the ratio 5:3, first a ray AX is drawn so that < BAX is an acute angle and then at equal distances points are marked on the ray AX such that the minimum number of these points is (a) 12 (b) 11 (c) 10 (d) 8 5. If the circumference and area of a circle are numerically equal, then diameter of the circle is  (a)2x (b) 2 (c) 4 (d) 4x 6. The number of solid spheres, each of diameter 2 cm that could be moulded to form a solid metal cylinder of height 45 cm and diameter 4 cm is (a)14 (b) 15 (c) 135 (d)

X Revision before exam Chemistry: NCERT Chapter - Periodic Classification of elements

Gist of Lesson for Quick Revision (By JSUNIL) 1. Periodic table: The table which classifies all the known elements on the basis of their properties in such a way that elements with similar properties are grouped together. The first classification of elements was as metals and non-metals.  In 1789, Lavoisier first attempted to classify the elements into two divisions namely Metals and Non-metals This served only limited purpose mainly because of two reasons:  (i). All the elements were grouped in to these two classes only. The group containing metals was very big.  (ii)  Some elements showed properties of both-metals and non-metals and they could not be placed in any of the two classes. 2. All earlier attempts on the classification of the elements were based on their atomic weights. 3. The first attempt towards the classification of elements was made by Johann Dobereiner, a German chemist in 1829. He made sets of three elements which showed similar chemical p