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Questions : #7, #8 & #9 (in Hindi)
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In this lesson solve questions #7 #8 & #9 from the question paper of IIT JEE MAINS 2017 - Set A

## Kumar Ketan is teaching live on Unacademy Plus

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3. IIT JEE 2017 PHYSICS Q. #1 to Q. #30 INDIAN IAN INSTITUTE Complete Paper Solution

4. Question 7 The variation of acceleration due to gravity g with distance d from centre of the earth is best represented by (R Earth's radius):

5. 9 Sol. 9. d=R Variation of g inside earth surface Gm Gm Gm

6. Question 8 A copper ball of mass 100 gm is at a temperature t. It is dropped in a copper calorimeter of mass 100 gm, filled with 170 gm of water at room temperature. Subsequently, the temperature of the system is found to be 75 C. T is given by: (Given : room temperature 30 C, specific heat of copper 0.1 cal/gm C) (1) 800 C (2) 885 C (3) 1250 C (4) 825 C

7. Sol. 100 x 0.1 x (t-75) = 100 x 0.1 x 45 + 170 x 1 x 45 10t-750 = 450 + 7650 10t = 1200 7650 10t 8850 t = 885 C

8. Question9 An external pressure P is applied on a cube at O'C so that it is equally compressed from all sides. K is the bulk modulus of the material of the cube and a is its coefficient of linear expansion. Suppose we want to bring the cube to its original size by heating. The temperature should be raised by (1)P/ (2)P/a K (3)3/PK a (4) 3PK a

9. V K _3 AV Vo