Time left 1 Pick out the scalar quantity force pressure velocity acceleration 2 Rectifiers are used to convert Direct current to Alternating current Alternating current to Direct current high voltage to low voltage low voltage to high voltage 3 out of the following, which is not emitted by radioactive substance? Electrons Electromagnetic radiations Alpha particles Neutrons 4 Sound waves in air are transverse longitudinal electromagnetic polarised 5 Magnetism at the centre of a bar magnet is minimum maximum zero minimum or maximum 6 It is more difficult to walk on a sandy road than on a concrete road because sand is soft and concreter is hard the friction between sand and feet is less than that between concrete and feet the friction between sand and feet is more than that between concrete and feet the sand is grainy but concrete is smooth 7 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 0.14 m/s 140 m/s 1.4 km/s 14 m/s 8 Of the following properties of a wave, the one that is independent of the other is its amplitude velocity wavelength frequency
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