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Metals are lustrous, malleable, ductile and are good conductors of heat and electricity. They are solids at room temperature, except mercury which is a liquid.
Metals can form positive ions by losing electrons to non-metals. Metals combine with oxygen to form basic oxides. Aluminium oxide and zinc oxide show the properties of both basic as well as acidic oxides.
These oxides are known as amphoteric oxides. Different metals have different reactivities with water and dilute acids. A list of common metals arranged in order of their decreasing reactivity is known as an activity series. Metals above hydrogen in the Activity series can displace hydrogen from dilute acids.
A more reactive metal displaces a less reactive metal from its salt solution. Metals occur in nature as free elements or in the form of their compounds. The extraction of metals from their ores and then refining them for use is Ncert Solutions For Class 10th Science Chapter 4 Review known as metallurgy. An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal. The surface of some metals, such as iron, is corroded when they are exposed to moist air for a long period of time.
This phenomenon is known as corrosion. Non-metals have properties opposite to that of metals. They are neither malleable nor ductile. They are bad conductors of heat and electricity, except for graphite, which conducts electricity. Non-metals form negatively charged ions by gaining electrons when reacting with metals. Non-metals form oxides which are either acidic or neutral. Non-metals do not displace hydrogen from dilute acids. They react with hydrogen to form hydrides.
Movement of various types can be taken as an indication of life. The maintenance of life requires processes like nutrition, respiration, transport of materials within the body and excretion of waste products. Autotrophic nutrition involves the intake of simple inorganic materials from the environment and using an external energy source like the Sun to synthesise complex high-energy organic material. Heterotrophic nutrition involves the intake of complex material prepared by other organisms.
In human beings, the food eaten is broken down by various steps along the alimentary canal and the digested food is absorbed in the small intestine to be sent to all cells in the body. During the process of respiration, complex organic compounds such as glucose are broken down to provide energy in the form of ATP. ATP is used to provide energy for other reactions in the cell.
Respiration may be aerobic or anaerobic. Aerobic respiration makes more energy available to the organism. In human beings, the transport of materials such as oxygen, carbon dioxide, food and excretory products is a function of the Ncert Solutions Class 10th Polynomials Review circulatory system. The circulatory system consists of the heart, blood and blood vessels. In highly differentiated plants, transport of water, minerals, food and other materials is a function of the vascular tissue which consists of xylem and phloem. In human beings, excretory products in the form of soluble nitrogen compounds are removed by the nephrons in the kidneys.
Plants use a variety of techniques to get rid of waste material. For example, waste material may be stored in the cell-vacuoles or as gum and resin, removed in the falling leaves, or excreted into the surrounding soil.
Control and coordination are the functions of the nervous system and hormones in our bodies. The responses of the nervous system can be classified as reflex action, voluntary action or involuntary action. The nervous system uses electrical impulses to transmit messages. The nervous system gets information from our sense organs and acts through our muscles.
Chemical coordination is seen in both plants and animals. Hormones produced in one part of an organism move to another part to achieve the desired effect. A feedback mechanism regulates the action of the hormones. A stream of electrons moving through a conductor constitutes an electric current. Conventionally, the direction of current is taken opposite to the direction of flow of electrons. The SI unit of electric current is ampere. To set the electrons in motion in an electric circuit, we use a cell or a battery.
A cell generates a potential difference across its terminals. It is measured in volts V. Resistance is a property that resists the flow of electrons in a conductor. It controls the magnitude of the current. The resistance of a conductor depends directly on its length, inversely on its area of cross-section, and also on the material of the conductor. The equivalent resistance of several resistors in series is equal to the sum of their individual resistances.
One watt of power is consumed when 1 A of current flows at a potential difference of 1 V. The commercial unit of electrical energy is kilowatt hour kWh. A compass needle is a small magnet. Its one end, which points towards north, is called a north pole, and the other end, which points towards south, is called a south pole. A magnetic field exists in the region surrounding a Ncert Solutions Up Board Class 10th Review magnet, in which the force of the magnet can be detected.
Field lines are used to represent a magnetic field. Some unrelated ans. Sort by. Top reviews Most recent Top reviews. Filter by. All reviewers Verified purchase only All reviewers. All stars 5 star only 4 star only 3 star only 2 star only 1 star only All positive All critical All stars. All text, image and video reviews Image and video reviews only All text, image and video reviews.
There was a problem filtering reviews right now. Please try again later. From India. Verified Purchase. Showing 0 comments. There was a problem loading comments right now. Such a nice books, it helped me in the exams, some tricky questions are there.
I love Oswaal books very much because they are in simple understandable words. Images in this review. Highly recommend Best ncert exemplar with mind maps and many other information. Quality of the book is also very attractive and shiny. Thank you oswaal and amazon. One person found this helpful. Must buy book. This book is gonna help you a lot. Must for all tenthies. As these has limited questions but all are important solve these completely for exam.
Covers each and every topic with less no. Of pages.
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