Science M.C.Q. [I MARKS]

The electrical charges generated by rubbing two objects are static and they do not move by themselves.

When we rubbed a glass rod with silk cloth, the glass rod becomes positively charged. The silk cloth becomes negatively charged. The electric charges generated by rubbing are static electric charges. These electric charges remain bound on the surface of the charged object.

The innermost layer of the Earth is the solid core which is made up of iron and nickel at a very high temperature and pressure. The second layer is called the mantle. The topmost layer is crust. The crust is made up of a layer of hard rocks that float on the molten mantle.

The main attribute common to all lightning rods is that they are all made of conductive materials, such as copper and aluminum.
Copper and its alloys are the most common materials used in lightning protection.
A lightning conductor is a metal rod or strap connecting the highest point on a building to the earth.
Its purpose is to protect the building from a damaging discharge of electricity between the atmosphere and the building, that is, a lightning strike.

Electroscope is the device which is used to detect charge on a body. It is used for detecting, measuring and finding the nature of a charge.

The process of electric discharge between clouds and the earth or between different clouds causes lightning.

When a negatively charged balloon is brought near the neutral sphere, negative charged electron on side of the sphere are repelled and moved away and that side will become positively charged.

The whole crust of the earth is not in one piece. The crust of earth is made up of many huge pieces of flat rocks. Each pieces of the earth crust is called a plate. The crust of earth is divided into many plates. The plates of earth on which continents exist are called “continental plates” whereas those plates of earth on which oceans exist are called “oceanic plates”.

Moving air is called wind. It flows from areas of higher pressure to areas of lower pressure.

Electrical charge passes through a conductor.

Here, all the statements are correct. Hence.

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Focus of an earthquake is located deep under the ground. Focus is the point inside the crust where the pressure is released. The point on the earth's surface above the focus is called the epicenter.

The jumping of electrons between the two patches of clouds bearing different charges results in a big spark. The spark is seen as a flash of lightning.

Here, all the statements are correct. Hence.

When we comb dry hair with plastic comb, friction takes place between two objects. Due to friction, hair losses some electrons to plastic comb. Due to loss of electron, the hair becomes positively charged and due to gain of electron, plastic comb becomes negatively charged.

Lightening is the name given to the flash of light which occurs in the sky during the rainy season. The process of electric discharge between clouds and the earth or between different clouds causes lightning.

All of the above substances are insulators whereas Copper rod is a conductor. As soon as we charge a copper rod by rubbing with another material, the electric charge flow through our hand and body and flows into the earth. As a result, the copper rod remains uncharged.

A body can be charged by conduction, induction and friction.

A mantle is a layer inside a planetary body bounded below by a core and above by a crust. Mantles are made of rock or ices, and are generally the largest and most massive layer of the planetary body. Mantles are characteristic of planetary bodies that have undergone differentiation by density.

The electric charges generated by rubbing are static electric charges. These electric charges remain bound on the surface of the charged object.

The electric charges generated by rubbing are static electric charges. There are two types of charges: Positive charge and negative charge.