Tiêu đề AITS 08 EVENING.pdf ✅

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DATE: 12/04/2023 Physics : Electromagne c Induc on, Alterna ng Current, Electromagne c Waves, Ray Op cs and Op cal Instruments Chemistry : Hydrogen, S- block, P- Block(Class-11 + 12), Metallurgy Botany : Molecular Basis of Inheritance, Organisms and Popula on Zoology : Microbes in Human Welfare, Evolu on TEST – 08 E Dropper
SPACE FOR ROUGH WORK [2] SECTION-I (PHYSICS) SECTION – A 1. A coil of resistance 20Ω and inductance 5 H has been connected to a 200 V battery. The maximum energy stored in the coil is (1) 250 J (2) 125 J (3) 500 J (4) 100 J 2. A coil having 500 square loops each of the side 10 cm is placed normal to a magnetic field which increases at the rate of 1.0 tesla/ second. The induced e.m.f. in volts is (1) 0.1 (2) 0.5 (3) 1 (4) 5 3. The refractive index of water is 4/3 and that of glass is 5/3. What will be the critical angle for the ray of light entering water from the glass (1) sin–1 4 5 (2) sin–1 5 4 (3) sin–1 1 2 (4) sin–1 2 1 4. A diver at a depth of 12m in water ( = 4/3) sees the sky in a cone of semi-vertical angle (1) sin–1 (4/3) (2) tan–1 (4/3) (3) sin–1 (3/4) (4) 90° 5. What is the average value of the AC having maximum value Vmax over one complete cycle? (1) Zero (2) Vmax (3) max 2V  (4) max 2 V 6. If an electromagnetic wave propagating through vacuum is described by E = E0 sin (kx – ωt); B = B0 sin (kx – ωt). Which of the following equation is true? (1) E0 k = B0 ω (2) E0B0 = ωk (3) E0 ω = B0 k (4) E0 B0 = ω/k 7. A current I = 10 sin (100π t) amp. is passed in first coil, which induces a maximum e.m.f of 5π volt in second coil. The mutual inductance between the coils is- (1) 10 mH (2) 15 mH (3) 25 mH (4) 5 mH 8. The electric field part of an electromagnetic wave in a medium is represented by Ex = 0; 6 2 rad rad 2.5 cos 2 10 10 ; y N E t x C m m       − =  −              Ez =0. The wave is: (1) Moving along – x direction with frequency 106 Hz and wave length 200 m. (2) Moving along y direction with frequency 2π × 106 Hz and wave length 200 m. (3) Moving along x direction with frequency 106 Hz and wave length 200 m. (4) Moving along x direction with frequency 106 Hz and wave length 200 m.
SPACE FOR ROUGH WORK [3] 9. If XL = XC then the reading of ideal voltmeter is: (1) V = VL – VC (2) 2 2 V V V = + R L (3) ( ) 2 2 V V V V = + − R L C (4) Zero 10. The current (I) in the inductance is varying with time according to the plot shown in figure. Which one of the following is the correct variation of voltage with time in the coil. (1) (2) (3) (4) 11. If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the medium is (1) 3 ×108 m/s (2) 1.5 ×108 m/s (3) 6 ×108 m/s (4) 8 3 10 m / s  12. A large glass slab ( = 5/3) of thickness 8 cm is placed over a point source of light on a plane surface. It is seen that light emerges out of the top surface of the slab from a circular area of radius R cm. What is the value of R? (1) 4 cm (2) 6 cm (3) 3 cm (4) 9 cm 13. Find the average value of current shown graphically from t = 0 to t = 2 s (1) 3A (2) 5A (3) 10A (4) 4A