NCERT Class 8 Science — Chapter 3: Some natural phenomena

With reference to the history of understanding electrical charges, consider the following statements: 1. The ancient Greeks knew that amber attracts light objects like hair when rubbed with fur. 2. Benjamin Franklin proved that lightning and sparks from clothes are two completely different phenomena. 3. The realization of the similarity between lightning and sparks from clothes took approximately two thousand years to occur. Which of the statements given above is/are correct?

Consider the following statements regarding the charging of objects by rubbing: 1. A plastic refill does not acquire any electric charge when rubbed with polythene. 2. When a plastic comb is rubbed with dry hair, both the comb and the hair get charged. 3. The electrical charges generated by rubbing are static in nature. Which of the statements given above is/are correct?

With reference to the interaction between charged objects, consider the following statements: 1. A charged balloon repels another charged balloon. 2. A charged refill repels a charged balloon. 3. A charged refill attracts another charged refill. Which of the statements given above are correct?

By convention, what is the nature of the electric charge acquired by a glass rod when it is rubbed with silk?

With reference to the construction and working of a simple electroscope, consider the following statements: 1. It utilizes plastic strips to detect charge. 2. The foil strips repel each other and open up when a charged body touches the metal clip. 3. It demonstrates that electrical charge can be transferred from a charged object to another through a metal conductor. Which of the statements given above is/are correct?