The surface tension of water on adding detergent to it
1). increases
2). decreases
3). no change
4). becomes zero
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1. According to Rutherford's atomic model, the electrons inside an atom are
2. The filament of electric bulb is made up of :
3. Superconductors are substances which
4. Unit of impedance is ________
5. Dynamo is a device for converting
6. What is the wavelength of visible spectrum ?
7. Moving electric charge produces :
8. Safety fuse wire used in domestic electrical appliances is made of metal of low