# General Knowledge - Physics

### Exercise :: Physics - Section 1

• Physics - Section 1
19.

out of the following, which is not emitted by radioactive substance?

 A. Electrons B. Electromagnetic radiations C. Alpha particles D. Neutrons

Explanation:

No answer description available for this question. Let us discuss.

20.

Sound waves in air are

 A. transverse B. longitudinal C. electromagnetic D. polarised

Explanation:

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21.

Magnetism at the centre of a bar magnet is

 A. minimum B. maximum C. zero D. minimum or maximum

Explanation:

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22.

It is more difficult to walk on a sandy road than on a concrete road because

 A. sand is soft and concreter is hard B. the friction between sand and feet is less than that between concrete and feet C. the friction between sand and feet is more than that between concrete and feet D. the sand is grainy but concrete is smooth

Explanation:

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23.

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

 A. 0.14 m/s B. 140 m/s C. 1.4 km/s D. 14 m/s

Explanation:

No answer description available for this question. Let us discuss.

24.

Of the following properties of a wave, the one that is independent of the other is its

 A. amplitude B. velocity C. wavelength D. frequency