The weakest of all fundamental forces is
1). Gravitational force
2). Electrostatic force
3). Magnetic force
4). Nuclear force
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1. The SI unit of resistance is:
2. Rear view mirror of car is convex or concave?
3. Which layer of the earth's atmosphere reflect back the radio waves to the earth's surface
5. The threshold frequency is the frequency below which :
6. Which one of the following instruments is used to study dispersion of light ?
7. Which among the following types of coal produces most heat per unit
9. The slope of a velocity time graph represents
10. The working of the quartz crystal in the watch is based on the