Why do telephone wires sag in summer ?

Statements given below are incorrect. Write the correct statements. When telephone wires are laid in summer, they are kept tight to prevent from sagging down.

Why do aquatic species feel more comfortable in the lakes in winter than in summer ?

Twelve horizontal telephone wires are supported by a vertex telegraph post , 5 wires ecrossing from the north and 7 wires from the rest . If all the wires are under the same tension , in which direction should the stay wire be fixed ? What is the resultant ten be fixed ? What is the resultant tension in the stay wire ?

Why are electric transmission lines kept slightly loose, when they are laid in summer? Explain.

Why is a white dress more comfortable than a dark dress in summer?

"In scooters more viscous mobile oil is used in summer than in winter". Why?

Why do they exist as monoatoms in molecules?

Number of 7 digit telephone numbers that can be formed from the digits 0 , 1 , 2 , ,………………..9 , if each telephone number begins with digit 5 is

Why do bodies become weightless in artificial satellites ?

Why do stars twinkle?