Question 1

Give an example of a metal which

(i) is a liquid at room temperature.
(ii) can be easily cut with a knife.
(iii) is the best conductor of heat.
(iv) is a poor conductor of heat.

Answer

(i) Mercury is the metal which is liquid at room temperature.

(ii) Sodium & Potassium are the metals that can be cut with a knife.

(iii) Silver is the metal which is the best conductor of heat.

(iv) Lead and Mercury are the metal that are poor conductors of heat.

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Find out, from Table 10.3, the medium having highest optical density. Also find the medium with lowest optical density.

Material medium	Refractive index	Material medium	Refractive index
Air	1.0003	Canada Balsam	1.53
Ice	1.31
Water	1.33	Rock salt	1.54
Alcohol	1.36
Kerosene	1.44	Carbon disulphide	1.63
Fused quartz	1.46
Turpentine oil	1.47	Ruby	1.71
Benzene	1.50	Sapphire	1.77
Crown glass	1.52	Diamond	2.42

Table 10.3 Absolute refractive index of some material media

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