The core of an electromagnet is made of soft iron because soft iron has
1). small susceptibility and small retentivity
2). large susceptibility and small retentivity
3). large density and large retentivity
4). small density and large retentivity?
1. The reason for a swimming pool to appear less deep than the actual depth is
3. When a body is immersed in a liquid, the force acting on it is
6. Heat transfer horizontally within the atmosphere Is called
7. The instrument which uses sound waves to measure the depth of oceans is
8. A device used for converting a.c. into d.c. is called
9. In the absence of ozone layer, which rays will enter into atmosphere?
10. A transformer