Human Nervous System Notes for SSC CGL, CHSL and Railways

Human Nervous System Notes for SSC CGL, CHSL and Railways

1. Nervous System (Central, Peripheral, Autonomic) The functioning of the nervous system depends on detecting a stimulus in the internal or external environment and responding to it. Neuron (Sensory, Motor, Association/Connecting): basic unit of nervous system. After birth there is no cell division of nerves in humans. The biological death of a patient means the death of the tissues of the Brain. The aquatic animal with the most developed intelligence is Shark. 1.1 Central Nervous System (Brain + Spinal Cord)…

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Food: Where Does It Come From Notes CBSE Class 6 Ch 1

Food: Where Does It Come From Notes CBSE Class 6 Ch 1

Food Nutritious substance that living organisms consume in order to maintain life and growth. Food is required for energy, growth, body functions, wound healing and for maintaining good health, etc. Plants as Source of Food Plant roots used as food for example Carrot, Turnip, Radish, Beetroot. Plant stems used as food for example Potato, Coriander, Sugarcane. Plant leaves used as food for example Spinach, Cabbage, Onion. Plant flowers used as food for example Rose, Cauliflower, Bauhinia(Kachnar) Plant fruits used as…

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Units & Measurement (GA Physics) Notes for SSC CGL, CHSL & Railways

Units & Measurement (GA Physics) Notes for SSC CGL, CHSL & Railways

Physical Quantity A physical quantity is a physical property of a phenomenon, body, or substance, that can be quantified by measurement. A physical quantity can be expressed as the combination of a magnitude (expressed by a number – usually a real number) and a unit. Unit of measurement A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of…

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Sound Notes (GA Physics) for SSC CGL, CHSL & Railways

Sound Notes (GA Physics) for SSC CGL, CHSL & Railways

Sound Sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid. 1 kHz = 1000 Hz Sound can not travel through vacuum. Sound waves are longitudinal waves. Frequency Range of Audible Sound for Humans: 20 Hz to 20 kHz Children under the age of five and some animals, such as dogs can hear up to 25 kHz. Infrasound / Infrasonic Sound Sound below 20 Hz Whales,…

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Thermodynamics (GA Physics) Notes for SSC CGL, CHSL & Railways

Thermodynamics (GA Physics) Notes for SSC CGL, CHSL & Railways

Thermodynamics The branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy. First Law of Thermodynamics The total energy of an isolated system is constant; energy can be transformed from one form to another, but can be neither created nor destroyed. Its a version of the law of conservation of energy, adapted for thermodynamic systems. ΔQ…

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The Fundamental Unit of Life Notes CBSE Class 9 Ch 5

The Fundamental Unit of Life Notes CBSE Class 9 Ch 5

Cell Cell (Discovered by Robert Hooke) is called as the structural and functional unit of life because All living organisms are made up of cells. All the activities performed by a living organism are sum total of activities performed by its cells. Examples: Nerve Cell, Sperm, Ovum, Fat cell, Bone cell, etc. Cell Theory (By Schleiden & Schwann) All the plants and animals are composed of cells. All cells arise from pre-existing cells. Plasma Membrane (Cell Membrane) (Selectively Permeable Membrane)…

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Optics (GA Physics) Notes for SSC CGL, CHSL & Railways

Optics (GA Physics) Notes for SSC CGL, CHSL & Railways

Optics (Ray Optics, Wave Optics) Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light. Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. Speed of Light: 3 x 108 ms-1 Time for light to reach on Earth from Sun: 8 minute 20 seconds When light falls…

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