21. Sound waves in air are
22. Magnetism at the centre of a bar magnet is
23. It is more difficult to walk on a sandy road than on a concrete road because
24. Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
25. Of the following properties of a wave, the one that is independent of the other is its
26. Lux is the SI unit of
27. On a rainy day, small oil films on water show brilliant colours. This is due to
28. Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
29. Materials for rain-proof coats and tents owe their water-proof properties to
30. RADAR is used for:
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