Question

3.
[
Among the following, - 3 oxidation number is exhibited by
a) Group IA
b) Group IIA
c) Group VA
d) Group IVA
​

Answer 1

Explanation:

. A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because

[A]. Friction between the layers of newspaper produces heat.

[B]. Air trapped between the layers of newspaper is a bad conductor of heat.

[C]. Newspaper is a conductor of heat.

[D]. Newspaper is at a higher temperature then the temperature of the surroundings.

2. Which of the following statement is incorrect?

[A]. Joule (J) is the SI unit of Temperature.

[B]. Air, water and wood are the poor conductor of heat.

[C]. Movement of molecule of liquid possible through convection.

[D]. None of the above.

3. An Iron ball at 40 Degree Celsius is dropped in a mug containing water at 40 Degree Celsius. The heat will

[A]. Flow from iron ball to water

[B]. Not flow from iron ball to water or from water to iron ball

[C]. Flow from water to iron ball

[D]. Increase the temperature of both

4. Convection may occur through

[A]. Solids, liquids

[B]. Liquids, gases

[C]. Solids, gases

[D]. Solids, liquids, gases

5. Once in a summer day, Pratima keeps an Iron chair in sunlight. After few hours, iron chair gets heated because

[A]. Heat is transferred by conduction

[B]. Heat is transferred by convection

[C]. Heat is transferred by radiation

[D]. Heat is transferred by all the process