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Physics Quiz 3 (25 MCQs)

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1. Water expands from 4*c to.
2. Graham law states that the rate of diffusion of a gas is inversely proportional to the square root of its.
3. A rainbow is always an are of a.
4. Which theory is based on the idea that gases consist of atoms or molecules moving rapidly rapidly in all directions?
5. Some solids do not melt when heated under normal conditions, instead they change directly from the solid to the gaseous state. This phenomenon is called.
6. When a pure _____ is heated its temperature rises unit it is at its melting point an additional quantity of heat causes it to melt.
7. Potential energy is due to the _____ of an object.
8. In how many modes, heat transfer can take place?
9. _____ solids do not have crystalline structure.
10. During winter season when snow falls, _____ is spread on the roads, that lowers the freezing point and thus snow does not make ice on the road and the road remains open for safe traffic.
11. In a body that moves in a circular path around a central point, the force that acts away from the centre is called.
12. Substances can be broken down into molecules and molecules can be broken down into.
13. _____ is defined as the force acting on a material divided by area over which the force is applied.
14. Pure _____ have precise melting and boiling points, fixed temperatures at which they change from one state to another.
15. A _____ is defined as a device for applying or transmitting mechanical power.
16. When a _____ is heated up, the kinetic energy of its atoms or molecules increases.
17. Conduction is the flow of heat through a.
18. Reflection in all types of mirrors is governed by _____ principal laws.
19. _____ is defined as the emission of alpha, particles beta particles or gamma rays by disintegration of nuclei of certain unstable elements.
20. _____ is defined as the ability to do work.
21. A liquid becomes a gas or vapour by increasing the.
22. Artificial radioactivity can be induced by bombarding a nucleus with high velocity.
23. _____ is the chemical decomposition that some substances undergo when an electric current passes through them.
24. The weight of a body is the downward force exerted by an object resulting from it being acted on by the force of.
25. The action which changes the state of rest or uniform motion of a body is called.
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