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NCERT Solutions for Class 10 Science Chapter 5 Periodic Classification of Elements (CBSE)

  NCERT Solutions for Class 10 Science Chapter 5 Periodic Classification of Elements (CBSE) Question 1 Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves ? Compare and find out. Answer: Yes, Dobereiner’s triads also existed in the columns of Newland’s Octaves. For example, Li, Na, K. If we consider lithium (Li) as the first element, then sodium (Na) is eighth element. If we consider sodium as the first element, then potassium is the eighth element. Question 2 What were the limitations of Dobereiner’s classification ? Answer: It failed to arrange all the then known elements in the form of triads of elements having similar chemical properties. Dobereiner could identify only three triads from the elements known that time. Question 3 What were the limitations of Newlands’ law of octaves ? Answer: (i) Newlands law of octaves was applicable to the classification of elements upto calcium only. After calcium every eighth element did not possess the properties similar to tha
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Money and credit Class 10th NCERT (cbse)

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                                        Money and credit Class 10th NCERT (cbse)                        Question 1:   In situations with high risks, credit might create further problems for the borrower. Explain? Answer: High-risk situations occur in rural areas because there the main demand for credit is for crop production which involves considerable costs on seeds, fertilisers, pesticides, water, electricity, repair of equipment. There is a minimum stretch of three of four months between the time when farmers buy these inputs and when they sell the crop. Farmers generally take crop loans at the beginning of the season and repay the loan after harvest. Repayment of the loan is crucially dependent on the income from farming. If a crop fails due to shortage of rain or for any other reason, a small farmer has to sell a part of the land to repay the loan. Failure of crops create further problems for the borrowers. Credit does not improve his earnings but leaves him worse off than before.
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Maths important questions for Class 10th cbse

Maths class 10 mcq question answers for cbse board  60 best mcq type impotant question  Click here for important questions...
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Ncert class 10th chapter Light Reflection and Refraction

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                    Ncert Class 10th Science                Light Reflection and Refraction                        Shiva Valley School   Question and Answers Question 1: Define the principal focus of a concave mirror. Answer: Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror. Question 2: The radius of curvature of a spherical mirror is 20 cm. What is its focal length?  Answer: Radius of curvature, R= 20 cm Radius of curvature of a spherical mirror = 2 x Focal length (R = 2f R 20 1=22 =10 cm Hence, the focal length of the given spherical mirror is 10 cm. Question 3: Name the mirror that can give an erect and enlarged image of an object. Answer: When an object is placed between the pole and the principal focus of a concave mirror, the image formed is virtual, erect, and enlarged.  Question 4: Why do we prefer a convex
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Introduction of Trigonometry 8.3

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                          Class 10th Maths                Introduction of Trigonometry                          Shiva valley school   Exercise 8.3                                 Thank You
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Introduction of Trigonometry 8.2

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                        Class 10th Maths              Introduction of Trigonometry                        Shiva valley school  Exercise 8.2                                 Thank You
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Ncert class 10th agriculture question and answer

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                  Ncert class 10th agriculture                         Shiva valley school                               Geography  Multiple choice questions (i). Which one of the following describes a system of agriculture where a single crop is grown on a large area? (a) Shifting Agriculture (b) Plantation Agriculture (c) Horticulture (d) Intensive Agriculture Answer:: (b) Plantation Agriculture (ii). Which one of the following is a rabi crop? (a) Rice (b) Millets (c) Gram (d) Cotton Answer:: (b) Gram (iii). Which one of the following is a leguminous crop? (a) Pulses (b) Millets (c) Jawar (d) Sesamum Answer: (a) Pulses (IV). Which one of the following is announced by the government in support of a crop? (a) Maximum support price (b) Minimum support price (c) Moderate support price (d) Influential support price Answer: (b) Minimum support price Question 2: Answer the following questions in 30 words. (i). Name one important beverage crop and specify the geographical conditions required
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Introduction to Trigonometry

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                              Class 10th Maths                    Introduction to Trigonometry                           Shiva valley School       Exercise:-8.1                Thank You 
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Chapter 11 - Human Eye and Colourful World

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  Chapter 11 - Human Eye and Colourful World                             Shiva valley school Question 1:  A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected? Answer: A student has difficulty in reading the blackboard while sitting in the last row. It shows that he is unable to see distant objects clearly. He is suffering from myopia. This defect can be corrected by using a concave lens. Question 2: The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to (a) presbyopia (b) accommodation (c) near-sightedness (d) far-sightedness Answer: (b) Human eye can change the focal length of the eye lens to see the objects situated at various distances from the eye. This is possible due to the power of accommodation of the eye lens.  Question 3: The human eye forms the image of an object at its  (a) cornea  (b) iris  (c) pupil  (d) ret
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