JEE PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

1 Easy

1 of 1

Application +4 | -1

A wire of cross sectional area

4\,m{m^2}

is fixed between two points at

{30^ \circ }C.Y = 2 \times {10^{11}}pa

and

\alpha = {10^{ - 5}}/\,{\,^ \circ }C

; When the temperature falls to

{20^ \circ }C

, the tension in the string in (newton) is

View answer and explanation

Correct option: C

Option D (80) is correct because it is the tension calculated using the formula involving Young's modulus, area, coefficient of linear expansion, and temperature difference.

More Questions from THERMAL PROPERTIES OF MATTER

Practice All Chapter MCQs →

In the relation

n = \frac{{PV}}{{RT}},n =

Mud houses are cooler in summer and warmer in winter because For cooking the food, which of the following type of utensil is most suitable Which of the following statements is correct? 300 gm of water at

{25^0}

is added to 100 g of ice at

{0^0}C

. The final temperature of the mixture is A black body radiates energy at the rate of

E\,\,W{m^{ - 2}}

at a high temperature T K. When the temperature is reduced to

\left( {\frac{T}{2}} \right)K

the radiant energy is