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Questions : #10 & #11 (in Hindi)
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In this lesson solve questions #10 & #11 from the question paper of IIT JEE MAINS 2017 - Set A

Kumar Ketan is teaching live on Unacademy Plus

Kumar Ketan
#Specialisation in Electronics #6 years teaching experience #Physics Faculty in Kota #"magical education" (211k+ subs) #Writer

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Unacademy user
you are fabulous teacher ma'am 😊😊
Indu bala
7 months ago
Thankyou dear.... How can I help you in the preparation?
Abhinav Swarankar
7 months ago
Just give your guidance like this and keep reading us. The way you teach is very good, so I enjoy reading from you.. Please carry on ma'am 😊 and I m a ssc aspirant right now your lessons are very beneficial for me Thank you 🙏🏻
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  2. 26.4k views 4.9 unacademy Kumar Ketan #16 Educator in IIT JEE #6 years teaching experience #IT JEE Physics #YouTuber (150k+ subs) #Unacademy educator(25kt lifetimeviews) #Under graduate topper Follow me on the Unacademy Learning App 1.3k 2 26 Followers Following Courses Get updates about new courses Watch all my lessons .Download slides and watch offline Lists (1) Kumar Ketan HINDI IIT JEE Physics by Kumar Ketan for lIT JEE 8 4 saves Kumar Ketan


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


  4. Question 10 Cpand Cp are specific heats at constant pressure and constant volume respectively. It is observed that Cp - Cp- a for hydrogen gas and Cp C-b for nitrogen gas. The correct relation between a and b is 14 (2) ab (3) a - 14b (4) a - 28b


  5. Sol. Let molar heat capacity at constant pressure Xp and molar heat capacity at constant volume X -q- pM For hydrogen; a = For N2; b = 2 28 = 14 a= 14bl


  6. Question 11 The temperature of an open room of volume 30 m3 increases from 17 C to 27 C due to the sunshine. The atmospheric pressure in the room remains 1 x 105 Pa. If n and ni are the number of molecules in the room before and after heating, then nr n will be (1) -1.61 x 1023 (2) 1.38 x 1023 (3) 2.5 x 1025 (4)-2.5 x 1025


  7. Sol. ninitial number of moles PV 10 x301.24x10 n RT1 3 RT 8.3 x 290 n2 final number of moles PV 10 x 30 RT2 8.3 x 300 1.20 x 10 Change of number of molecules n, n(n2-n)x 6.023 x 1023 a 2.5 x 1025


  8. Question 12 A particle is executing simple harmonic motion with a time period T. At time t = 0, it is at its position of equilibrium. The kinetic energy-time graph of the particle wil look like: KE KE (3) - 2 2 KE KE 4 2


  9. Sol. K.Emo A2 cos2 cot 2 KE I T


  10. Question 13 An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10 GHz. What is the frequency of the microwave measured by the observer? (speed of light 3 x 108 ms-1) (1) 10.1 GHz (2) 12.1 GHz (3) 17.3 GHz (4) 15.3 GHz


  11. Question 14 An electric dipole has a fixed dipole moment p, which makes angle 8 with respect to x-axis. When subjected to an electric field E1 Ei, it experiences a torque T1=t. When subjected to another electric field E23Ei it experiences a torque The angle is T2 =-T1 . (1) 30 (2) 45 (3) 60 (4) 90


  12. Question 15 A capacitance of 2uF is required in an electrical circuit across a potential difference of 1.0 kV. A large number of 1uF capacitors are available which can withstand a potential difference of not more than 300 V. The minimum number of capacitors required to achieve this is (2) 16 (3) 24 (4) 32