A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously ?
1). They must have the same volume
2). They must have the same density
3). They must have the same mass
4). They must be dropped in vacuum
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1. In a railway track, two rails are joined end to end with a gap in between them because
2. The resistance of the human body (dry condition) is of the order of
3. Acceleration is the rate of change of
4. When a vehicle passes, TV reception gets distorted. This is because
5. When a ring of metal is heated what happens to its hole ?
6. The focal length of a concave mirror with a radius of curvature of 20.0 cm is :