B. Statements given below are incorrect. Write the correct statements.
1. When a flat sheet of copper is heated the increase in its area is called cubical expansion.
2. A bimetallic strip expands equally on heating and does not bend.
3. An iron rim of a slightly smaller diameter than a wooden wheel is cooled so that it easily slips over wooden wheel.
4. Small gaps are provided between the railway lines to provide for easy transportation and laying of railway lines.
5. New electric wires for power transmission are fixed tightly, if laid during summer. This
prevents wires from snapping in winter.
Answers
Answer:
1) When a flat sheet of copper is heated the increase in its area is called superficial expansion.
2) A bimetallic strip expands unequally on heating and bends.
3) An iron rim of a slightly smaller diameter than a wooden wheel is heated so that it easily slips over wooden wheel.
4) Small gaps are provided between the railway lines to prevent the bending of rails due to linear expansion in summers.
5) New electric wires for power transmission are kept slightly loose, if laid during summer. This prevents wires from snapping in winter.
Explanation:
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Answer:
1. When a flat sheet of copper is heated the increase in its area is called superficial expansion.
2. A bimetallic strip expands unequally on heating and bend.
3. An iron rim of a slightly smaller diameter than a wooden wheel is heated so that it easily slips over wooden wheel.
4. Small gaps are provided between the railway lines to prevent the bending of rails due to the linear expansion in summer.
5. New electric wires for power transmission are kept slightly loose, if laid during summer. This
prevents wires from snapping in winter.