Three ice cubes of similar shape and size were kept on three different surfaces - glass, copper and concrete. Equal amount of heat was supplied to all three surfaces. The first ice cube to completely melt was the cube on the copper surface, while the one on the glass surface melted last. Arrange Copper, Glass and Concrete from worst heat conductor to best.
Important Questions on Heat
Lal conducts the following activity to check if colour has any effect on heat absorption.He takes four identical cans with the same amount of water but covered with different coloured papers and places them near a heat source as shown in the figure.
The temperature of the water in the cans is measured at regular intervals.
This experiment will not lead to correct result due to a mistake in the setup. The mistake is related to
The diagram below shows a block of wood stuck in a metal container.
Which of these is the best way to remove the block of wood undamaged?
A wet cloth was placed on a balance and left for several days. The change in its mass is shown in the graph below: What was the mass of water in the cloth at the start of the experiment?
The table below gives the melting and boiling points of a few metals.
| Name of the metal | Melting point | Boiling point |
| Silver | ||
| Tin | ||
| Gold | ||
| Aluminium | ||
| Tungsten | ||
| Lead |
Which of these metals remains a liquid over the widest range of temperature?
The table below gives the melting and boiling points of a few metals.
| Name of the metal | Melting point | Boiling point |
| Silver | ||
| Tin | ||
| Gold | ||
| Aluminium | ||
| Tungsten | ||
| Lead |
Soft solders are filler metals that melt and flow below . Which pair of metals would be most suitable for soft solders?
