A soap bubble shows colours when illuminated with white light. This is due to
1). Diffraction
2). Polarization
3). Interference
4). Reflection
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2. A spherical ball made of steel when?dropped in a bucket full of mercury (hg) will
3. Moving electric charge produces :
4. Newton's first law is also known as _______.
6. The density of a gas is maximum at
7. Holography is a technique of
8. Electrical Energy is the energy of
10. When a person sitting on a swing stands up on the swing the frequency of oscillation