The frequency of direct current is _____________
1). Zero
2). 50 HZ
3). 60 HZ
4). 100 HZ
1. The blue colour of water in the sea is due to
2. Moving electric charge produces :
3. If the length of a simple pendulum is halved then its period of oscillation is
4. Tungsten is used for the manufacture of the filament of an electric bulb, because
6. The complete form of 'IC' in electronics is
7. The Law of Kepler is related with which among the following ?
8. What does the wheel in the National Flag represent?
9. Which among the following is false about Earth?
10. Instrument used to measure the force and velocity of the wind is