## Udit Gupta is teaching live on Unacademy Plus

Properties of Matter Booster Set udit Gupta

NEW COURSE unacademy IT JEE 100 PYQs to Score High in Physics for 12th Board Exam Last date to apply is 14th Jan Udit Gupta Visit: unacademy.com/plus

Question 1 Three rods of equal length are joined to form an equilateral triangle ABC. D is the midpoint of AB. The coefficient of line ar expansion is for AB and 2 for AC and BC. If the distance DC remains constant for small changes in temperature: (b) 2 2 1 2 2

Answer1 DC VBC2 - DB2 0 (2BCABC- 2DBADB) 1 2- 4 Correct option is (c).

Question 2 Two rods, one of aluminium and the other made of steel, having initial lengths 11 and 12 are connected together to form a single rod of length l1 + 12. The coefficients of linear expansion for aluminium and steel are , and s, respectively. If the length of each rod increases by the same amount when their temperatures are raised by t c, then find the ratio 1+2

Answer 2 The length of each rod increases by the same amount. 22+15+1 1 1 T 2 Correct option is (d)

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