The most abundant element in the universe is ______.
A. Oxygen
B. Hydrogen
C. Carbon Dioxide
D. Silicon
A device which converts chemical energy into electrical energy is called _____. A. motor B. generator C. moving-coil meter D. battery <!--more-->
Radioactivity was discovered by _____. A. Kelvin B. Thomson C. Rutherford D. Bacquerel <!--more-->
- Go to the previous page
- 1
- …
- 64
- 65
- 66
- 67
- 68
- 69
- 70
- …
- 86
- Go to the next page