When some detergent is added to water, the surface tension:
1). ?increases?
2). decreases
3). remains unaffected
4). ?none of these?
2. Triton is the moon of which planet?
3. Density of water is maximum at ______.
4. The spring constant of a spring depends on its
5. What is found in frequency modulation?
6. Which one among the following doesn't have any effect on velocity of sound ?