In an experiment shown in figure, the water near the top of the tube starts boiling but the wax in the test tube does not melt completely. What do you conclude?
 
A Convection cannot occur in water.
B Water is a poor conductor of heat.
C Wax is a bad radiator of heat.
D Heat is not reaching at the bottom of the test tube as tube is made of insulator.
Ans 2:
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Class : Class 10 
                                                                                                
                                                                                                Water does not allow the heat to pass through to the wax. it proves that water is a bad conductor of heat.
                                                                                            
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Ans 14:
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Class : Class 9 
                                                                                                
                                                                                                b is the ans . this activity shows that heat doesnt reach wax ie water is bad conducyor
                                                                                            
                                                                                             
             
             
        