Some Natural Phenomena
| Description: Some Natural Phenomena | |
| Number of Questions: 15 | |
| Created by: Sundari Chatterjee | |
| Tags: Science Class 8 Transfer of Charge from One Body to Another Some Natural Phenomena Concept of Thunderstorm and Safety While Lightning Earthquake and its Causes Measuring of Earthquake and Protection Against it |
Which of the following objects can be charged by rubbing while being held in a hand?
Which of the following devices is used to detect electric charge on an object?
Which of the following statements is/are false?
a. Lightning is an electric spark on a huge scale which is caused by the accumulation of electric charges in the clouds. b. Electric charge is the property of matter which is responsible for electrical phenomenon. c. The electric charges which appear on a plastic comb when rubbed with dry hair are the static electric charges which remain bound to the surface of an object and do not move.
Which of the following scientists established the electric nature of lightning?
Which of the following statements is/are false?
a. A charged object attracts other charged objects and repels other uncharged objects. b. The charging of an object by rubbing it with another charged object is called charging by friction. c. The human skin is a conductor of electricity which allows electric charges to move through it.
Which of the following instruments measures and records the magnitude of an earthquake in terms of the shockwaves it produces?
Which of the following statements is/are false?
a. Whether an object will lose or gain electrons during rubbing depends on the nature of the material of the object. b. A positive charge repels a negative charge and attracts a positive charge. c. A charged object attracts an uncharged object by producing opposite charges in the nearer end of the uncharged object by electric induction.
Match the following:
| a. Earthing | 1. is a device used to protect a building from the effects of lightning |
| b. Electric discharge | 2. is the passage of electric current in air due to movement of electric charges |
| c. Lightning conductor | 3. is the process of transferring an electric charge from a charged object into the Earth |
The magnitude of an earthquake is expressed on
Which of the following objects cannot be charged by rubbing while being held in a hand?
Which of the following statements is/are false?
a. An earthquake is a sudden shaking of Earth which lasts for a very short time that occurs when the moving plates of the Earth's crust slide past or collide with one another. b. The inside of the Earth's crust is made up of the core, mantle and crust. c. An earthquake is a destructive natural phenomenon that can be predicted in advance.
Match the following:
| a. Core | 1. is the outermost solid shell of Earth containing all the life |
| b. Mantle | 2. is the central region of Earth extending from fourteen hundred to eighteen hundred miles from the Earth's center |
| c. Crust | 3. is the central region of Earth consisting of hot, dense, semisolid rocks and is about 2,900 kilometers thick |
Which of the following statements is/are false?
a. Objects made of acrylic plastics such as ball pen refills get negatively charged on rubbing. b. In an uncharged object, the number of protons and electrons in an atom are equal. c. In an object, the equal number of positive and negative electric charges balance each other and make the object electrically neutral.
Which of the following is/are the precautions that should be taken for protection against lightning strikes during a thunderstorm?
a. One should not remain standing outside, but should rush indoors. b. One should avoid raising an umbrella over his head during lightning. c. During lightning, one should avoid touching metal pipes fixed in a house or a building.
On rubbing, which of the following materials will lose electrons more easily and get positively charged?