The correct option is A-2, B-3, C-1, D-4
Explanation
This fundamental definitions and historical context of scientific terms and instruments, specifically focusing on electrostatics and geophysics.- A. Amber (Matches with 2): Amber is a fossilized tree resin. Historically, around 600 BC, Thales of Miletus observed that when amber is rubbed with wool, it acquires the property of attracting light objects such as hair or dry leaves. This phenomenon is the basis of triboelectricity (frictional electricity). The word "electricity" is derived from the Greek word elektron, which means amber.
- B. Electroscope (Matches with 3): An electroscope is a scientific instrument used to detect the presence of an electric charge on a body. A common example is the gold-leaf electroscope, where the divergence of gold leaves indicates the presence of charge due to electrostatic repulsion.
- C. Seismograph (Matches with 1): A seismograph is an instrument used to detect and record the intensity, direction, and duration of ground motion produced by earthquakes (seismic waves).
- D. Lightning Conductor (Matches with 4): A lightning conductor is a heavy metal strip or rod installed on the highest point of a building. It is connected to a metal plate buried deep in the ground. It protects the building from lightning strikes by providing a low-resistance path for the electric discharge to flow safely into the earth.
Key Takeaway: The historical discovery of static electricity is linked to amber, while the electroscope is the standard device for detecting charge. Lightning conductors apply the principle of grounding to protect structures.