Electron microscope was invented by
1). Knoll and Ruska
2). Robert Koch
3). Leeuwenhoek
4). C.P. Swanson
1. A man cannot see clearly beyond 10 meters. The disease he suffers from :
2. How much mechanical work must be done to completely melt 1 gram of ice at 0℃
3. Which of the following produces more severe bums
4. A dynamo is used to convert
5. ?Which of the following is not the cause of low conductivity of electrolyte
6. Contact force is another name for _________.
7. The first law of thermodynamics is simply the case of
8. A white and smooth surface is
9. The fuse in our domestic electric circuit melts when there is a high rise in