Selina Concise Mathematics Class 9 ICSE Solutions

ICSE Solutions for Class 9 Geography – Natural Regions of the World

ICSE Solutions for Class 9 Geography – Natural Regions of the World ICSE Solutions for Class 9 Geography – Natural Regions of the World Exercises I. Short Answer Questions. Question 1. Define the term ‘natural region’. Answer: A natural region refers to a part of Earth’s surface having a particular uniformity in physical and climatic elements. Question 2. Name any four natural regions of the world. Answer: Equatorial Region, Tropical Grasslands (Savanah), Tropical Monsoon type and Tropical Deserts. Question 3. Briefly state the importance of climate. Answer: Climate imparts an important effect on human life, as the life style, occupations, trade facilities all are deeply related to the climatic behaviour of a particular natural region. Climate has a remarkable impact on human efficiency too. Question 4. State the location of the Equatorial Region. Answer: It is found in Amazon basic, Congo basin and Indonesia etc. Question 5. What is the latitudinal extent of the Monsoon climate? Answe...

Selina Concise Physics Class 10 ICSE Solutions Chapter 12 - Radioactivity

Selina Concise Physics Class 10 ICSE Solutions Radioactivity Selina ICSE Solutions for Class 10 Physics Chapter 12 Radioactivity Exercise 12(A) Solution 1. Three constituent of an atom are: Electrons: mass is 9.1 x 10-31 kg, charge is -1.6 x 10-19C Neutron: mass is 1.6749 x 10-27 kg, charge is zero. Protons: mass is 1.6726 x 10-27 kg, charge is +1.6 x 10-19 C Solution 2 . Atomic number – the number of protons in the nucleus is called atomic number. Mass number – the total number of nucleons in the nucleus is called mass number. Solution 3. The nucleus at the centre of atom, whose size is of the order of 10-15 m to 10-14 m. The size of a nucleus is 10-5 to 10-4 times the size of an atom. It consists of protons and neutrons. If Z is the atomic number and A is the mass number of an atom, then the atom contains Z number of electrons; Z number of protons and A – Z number of neutrons. The atom is specified by the symbol ZXA where X is the chemical symbol for the element. Solution 4....

Selina Concise Physics Class 10 ICSE Solutions Chapter 4 - Refraction of Light at Plane Surfaces

Selina Concise Physics Class 10 ICSE Solutions Refraction of Light at Plane Surfaces Selina ICSE Solutions for Class 10 Physics Chapter 4 Refraction of Light at Plane Surfaces Exercise 4(A) Solution 1. The change in the direction of the path of light, when it passes from one transparent medium to another transparent medium, is called refraction of light . Solution 2. Solution 3. The ray of light which is incident normally on a plane glass slab passes undeviated. That is such a ray suffers no bending at the surface because here the angle of incidence is 0°. Thus if angle of incidence ∠i = 0°, then the angle of refraction ∠r = 0°. And the angle of deviation of the ray will also be 0°. Solution 5. The refraction of light (or change in the direction of path of light in other medium) occurs because light travels with different speeds in different media. When a ray of light passes from one medium to another, its direction (except for ∠i = 0°) changes because of change in its spe...

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