Which of the following objects cannot be charged by rubbing?

Which of the following materials can be charged by friction by rubbing it with a silk cloth?

Which of the following statements is/are false?

a. Lightning is an electric spark on a huge scale that is caused by the accumulation of electric charges in the clouds. b. The electric charge that appears on a plastic pen when it is rubbed with a sheet of paper is the static charge that remains bound to the surface of object. c. The current in a circuit which makes a bulb glow is a static charge.

Which of the following objects will get negative charge on rubbing?

a. Ballpen refill b. Inflated rubber balloon c. Hair

Which of the following statements is/are false?

a. On rubbing, the rubber balloon gets negative electric charge, whereas the woollen cloth acquires positive electric charge. b. The object that loses negatively charged electrons during rubbing acquires a negative charge. c. The electrical charges generated by rubbing are static and do not move on their own.

Which of the following materials will gain electrons more easily and hence, will acquire a type of charge?

Which of the following instruments can be used to detect whether an object is electrically charged or not?

The electric nature of lightning was established by

Lightning strikes are more frequent in hilly areas because

Which of the following statements is/are false?

a. A charged balloon attracts a charged balloon. b. Lightning is an electric discharge in the atmosphere between oppositely charged clouds. c. The top of a cloud is positively charged, whereas the bottom of a cloud is negatively charged.

The central region of earth is called mantle. Which of the following is a property of mantle?

Which of the following statements is/are false?

a. The process of electric discharge between clouds and the earth or between different clouds causes lightning. b. Lightning conductors can protect buildings from the effects of lightning. c. Earthquakes tend to occur away from the boundaries of earth’s fault zones.

Which of the following is/are the reason(s) due to which earthquakes occur?

a. Earthquakes occur when the moving plates of earth's crust slide past one another. b. Earthquakes occur when the moving plates of earth's crust collide with one another. c. Earthquakes occur when the moving plates of earth's crust move around very quickly over the mantle.

Which of the following instruments measures and records the magnitude of an earthquake in terms of the shock waves it produces?

Which of the following statements is/are false?

a. The intensity of an earthquake is expressed on the Richter scale. b. The place inside the earth's crust where the earthquake is generated is called the focus of the earthquake. c. The earthquakes having magnitude lesser than 5 are really destructive earthquakes.