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Questions : #20 & #21 (In Hindi)
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In this lesson solve questions #20 & #21 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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hmm dono ke bare me janta hun bahut ache se
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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 20 In a coil of resistance 100 0, a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is 10 Current (amp.) (1) 200 Whb (2) 225 Wb (3) 250 Wb (4) 275 Whb 0.5 s Time


  5. do dt Sol. = do dt iR Magnitude of change in fluxR x area under current vs time graph =100 -x-x10 = 250 Wb


  6. Question 21 An electron beam is accelerated by a potential difference V to hit a metallic target to produce X-rays. It produces continuous as well as characteristic X-rays. If Amin is the smallest possible wavelength of X-ray in the spectrum, the variation of log min with log V is correctly represented in (1) log (3) log log V log V (4) log (2) log og V log V


  7. Sol. In X-ray tube hc in eV hc Slope is negative Intercept on y-axis is positive log in log V


  8. Question 21 An electron beam is accelerated by a potential difference V to hit a metallic target to produce X-rays. It produces continuous as well as characteristic X-rays. If Amin is the smallest possible wavelength of X-ray in the spectrum, the variation of log min with log V is correctly represented in (1) log (3) log log V log V (4) log (2) log og V log V


  9. Sol. In X-ray tube hc in eV hc Slope is negative Intercept on y-axis is positive log in log V


  10. Question 22 A diverging lens with magnitude of focal length 25 cm is placed at a distance of 15 cm from a converging lens of magnitude of focal length 20 cm. A beam of parallel light falls on the diverging lens. The final image formed is (1) Real and at a distance of 40 cm from convergent lens (2) Virtual and at a distance of 40 cm from convergent lens (3) Real and at a distance of 40 cm from the divergent lens (4) Real and at a distance of 6 cm from the convergent lens


  11. Question 23 In a Young's double slit experiment, slits are separated by 0.5 mm, and the screen is placed 150 cm away. A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes on the screen. The least distance from the common central maximum to the point where the bright fringes due to both the wavelengths coincide is (1) 1.56 mm (2) 7.8 mm (3) 9.75 mm (4) 15.6 mm


  12. Question 24 A particle A of mass m and initial velocity v collides with a particle B of mass m/2 which is at rest. The collision is head on, and elastic. The ratio of the de-Broglie wavelengths A to after the collision is (1) 4A 1 (3) tA A =


  13. Sol. From energy level diagram hc hc 3 3