Insulator – It is a substance that cannot conduct electricity.
Earthing – It is the process by which charge is transferred from a charged object to the earth.
Incident ray – It is the light ray that falls directly on a surface.
Reflected ray – It is the light ray that comes back after the reflection.
Celestial objects – Objects present in the sky are called celestial objects. Ex – moon, star and sun.
Astronomy – It is the study of celestial objects and phenomena associated with them.
Kharif crops are crops that are sown in the rainy season while crops that are sown in the winter season are called Rabi crops.
Bacteria, fungi, protozoa and algae.
Viruses are microscopic organisms that reproduce only in the host body
Thermosetting plastic – It is plastic that cannot be altered by heating again after it has been softened, pressed or moulded once.
Thermoplastic – It is plastic that can be heated and altered easily even after it has been moulded, pressed or softened once.
Ductility is the property of metals by which they can be made into wires.
Malleability is the property of metals by which they can be beaten into thin sheets.
Inexhaustible resources are resources that can not be exhausted by human activities. Exhaustible resources are resources that can be exhausted by human activities.
Combustion – It is the process of a substance reacting with oxygen and giving off heat.
Ignition temperature – It is the lowest temperature at which a substance can catch fire.
Red data book – It is the book that keeps a record of all endangered species.
Endemic species – These are those species that are found exclusively in a particular area.
Unicellular organisms are organisms that consist of only one cell. Ex – Amoeba.
Multicellular organisms are organisms that consist of more than one cell. Ex – Human body.
Internal fertilization is the process of fusion of male and female gametes inside the female body.
External fertilization is the process of fusion of male and female gametes that takes place outside the female body.
Target site – It is the particular body part for which the endocrine system releases hormones into the bloodstream.
Adolescence – It is the reproductive maturity due to the body undergoing changes.
Secondary sexual characters – These are the characteristics that help us distinguish the male from the female.
Contact force – It is the force that is caused by the action of muscles.
Electrostatic force – It is the force exerted by a charged body on another uncharged or charged body.
Pressure – It is the force exerted by a body per unit area of a surface.
Rolling friction – It is the frictional force caused when one body rolls over another surface.
Sliding friction – It is the frictional force between the two surfaces when one is sliding over the other.
Lubricant – It is the substance that reduces the frictional force between two surfaces.
Vibration – It is the back and forth movement of an object.
Vacuum – When air from a system or an object is completely taken out, that state is called vacuum.
Eardrum – It is the thin stretched membrane at the end of the ear canal.
Following precautions must be taken during an earthquake:
Run out of the house in an open field.
Do not stand under trees or light poles.
If stuck inside the house, hide under sturdy furniture like a bed.
33. Electroplating is the process of depositing a thin layer of desired metal over another metal object. It is done with the help of an electric current. In this method, the object that needs to be coated is made the cathode. Whereas, the metal that needs to be deposited is made the anode. An electrolyte of the same metal is used. When current flows through the cathode and anode dipped in the electrolyte. The transfer of metal from anode to cathode takes place.
34. The crust is the outermost layer of the terrestrial planet. The mantle is the layer between the crust and the molten outer core. The molten outer core is the liquid core between the mantle and the solid inner core. The solid inner core is the last layer of the planet.
35. An earthquake takes place when two earth plates or surfaces come in contact with each other. Two plates either collide or brush past each other. The disruption that is caused due to such activity is called an earthquake.
36. The law of reflection states that the angle of incidence is always equal to the angle of reflection. The angle of incidence (i) is the angle made by the incident ray and the normal, whereas the angle of reflection (r) is the reflected ray and the normal.
37. Air pollution is the situation of air getting contaminated with unwanted substances which can have an adverse or harmful effect on the environment. Following measures must be taken to control air pollution:
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