Page 1 ?EC-Paper Code-B? GATE 2011 1 Q. No. 1 – 25 Carry One Mark Each 1. Consider the following statements regarding the complex Poynting vector P for the power radiated by a point source in an infinite homogeneous and lossless medium. ( ) Re P denotes the real part of P . S denotes a spherical surface whose centre is at the point source, and ? ndenotes the unit surface normal on S. Which of the following statements is TRUE? (A) ( ) Re P remains constant at any radial distance from the source (B) ( ) Re P increases with increasing radial distance from the source (C) ( ) s Re P .ndS ?? remains constant at any radial distance from the source (D) ( ) s Re P .ndS ?? decreases with increasing radial distance form the source Answer: - (D) Exp: - ( ) S ˆ Re P .nds ?? gives average power and it decreases with increasing radial distance from the source 2. A transmission line of characteristic impedance 50O is terminated by a 50O load. When excited by a sinusoidal voltage source at 10GHz, the phase difference between two points spaced 2mm apart on the line is found to be 4 p radians. The phase velocity of the wave along the line is (A) 8 0.8 10 m /s × (B) 8 1.2 10 m / s × (C) 8 1.6 10 m /s × (D) 8 3 10 m /s × Answer: - (C) Exp: - 0 Z 50 = O ; L Z 50 = O For 4 p radians the distance is 2mm The phase velocity 10 7 8 P 3 2 10 v 16 10 1.6 10 m / s 2 16 10 - - ? × p × = = = × = × p ß × 3. An analog signal is band-limited to 4kHz, sampled at the Nyquist rate and the samples are quantized into 4 levels. The quantized levels are assumed to be independent and equally probable. If we transmit two quantized samples per second, the information rate is ________ bits / second. (A) 1 (B) 2 (C) 3 (D) 4 Answer: - (D) Exp: - Since two samples are transmitted and each sample has 2 bits of information, then the information rate is 4 bits/sec. Page 2 ?EC-Paper Code-B? GATE 2011 1 Q. No. 1 – 25 Carry One Mark Each 1. Consider the following statements regarding the complex Poynting vector P for the power radiated by a point source in an infinite homogeneous and lossless medium. ( ) Re P denotes the real part of P . S denotes a spherical surface whose centre is at the point source, and ? ndenotes the unit surface normal on S. Which of the following statements is TRUE? (A) ( ) Re P remains constant at any radial distance from the source (B) ( ) Re P increases with increasing radial distance from the source (C) ( ) s Re P .ndS ?? remains constant at any radial distance from the source (D) ( ) s Re P .ndS ?? decreases with increasing radial distance form the source Answer: - (D) Exp: - ( ) S ˆ Re P .nds ?? gives average power and it decreases with increasing radial distance from the source 2. A transmission line of characteristic impedance 50O is terminated by a 50O load. When excited by a sinusoidal voltage source at 10GHz, the phase difference between two points spaced 2mm apart on the line is found to be 4 p radians. The phase velocity of the wave along the line is (A) 8 0.8 10 m /s × (B) 8 1.2 10 m / s × (C) 8 1.6 10 m /s × (D) 8 3 10 m /s × Answer: - (C) Exp: - 0 Z 50 = O ; L Z 50 = O For 4 p radians the distance is 2mm The phase velocity 10 7 8 P 3 2 10 v 16 10 1.6 10 m / s 2 16 10 - - ? × p × = = = × = × p ß × 3. An analog signal is band-limited to 4kHz, sampled at the Nyquist rate and the samples are quantized into 4 levels. The quantized levels are assumed to be independent and equally probable. If we transmit two quantized samples per second, the information rate is ________ bits / second. (A) 1 (B) 2 (C) 3 (D) 4 Answer: - (D) Exp: - Since two samples are transmitted and each sample has 2 bits of information, then the information rate is 4 bits/sec. ?EC-Paper Code-B? GATE 2011 4. The root locus plot for a system is given below. The open loop transfer function corresponding to this plot is given by (A) ( ) ( ) ( ) ( ) ( ) s s 1 G s H s k s 2 s 3 + = + + (B) ( ) ( ) ( ) ( ) ( ) 2 s 1 G s H s k s s 2 s 3 + = + + (C) ( ) ( ) ( ) ( ) ( ) 1 G s H s k s s 1 s 2 s 3 = - + + (D) ( ) ( ) ( ) ( ) ( ) s 1 G s H s k s s 2 s 3 + = + + Answer: - (B) Exp: - 'x' ? indicates pole 'O' ? indicates zero The point on the root locus when the number of poles and zeroes on the real axis to the right side of that point must be odd 5. A system is defined by its impulse response ( ) ( ) n h n 2 u n 2 = - . The system is (A) stable and causal (B) causal but not stable (C) stable but not causal (D) unstable and non-causal Answer: - (B) Exp: - ( ) ( ) n h n 2 u n 2 = - ( ) h n is existing for n>2 ; so that ( ) h n 0;n 0 = < ? causal ( ) ( ) n n n n n 2 h n 2 u n 2 2 8 8 8 =-8 =8 = = - = = 8 ? ? ? ? System is unstable 6. If the unit step response of a network is ( ) t 1 e -a - , then its unit impulse response is (A) t e -a a (B) 1 t e - -a a (C) ( ) 1 t 1 e - -a - a (D) ( ) t 1 e -a - a Answer: - (A) Exp: - ( ) S t ? step response Impulse response ( ) ( ) ( ) ( ) t t d d h t S t 1 e e dt dt a a = = - = a 7. The output Y in the circuit below is always ‘1’ when × × × o j? s 0 1 - 2 - 3 - P Q R Y Page 3 ?EC-Paper Code-B? GATE 2011 1 Q. No. 1 – 25 Carry One Mark Each 1. Consider the following statements regarding the complex Poynting vector P for the power radiated by a point source in an infinite homogeneous and lossless medium. ( ) Re P denotes the real part of P . S denotes a spherical surface whose centre is at the point source, and ? ndenotes the unit surface normal on S. Which of the following statements is TRUE? (A) ( ) Re P remains constant at any radial distance from the source (B) ( ) Re P increases with increasing radial distance from the source (C) ( ) s Re P .ndS ?? remains constant at any radial distance from the source (D) ( ) s Re P .ndS ?? decreases with increasing radial distance form the source Answer: - (D) Exp: - ( ) S ˆ Re P .nds ?? gives average power and it decreases with increasing radial distance from the source 2. A transmission line of characteristic impedance 50O is terminated by a 50O load. When excited by a sinusoidal voltage source at 10GHz, the phase difference between two points spaced 2mm apart on the line is found to be 4 p radians. The phase velocity of the wave along the line is (A) 8 0.8 10 m /s × (B) 8 1.2 10 m / s × (C) 8 1.6 10 m /s × (D) 8 3 10 m /s × Answer: - (C) Exp: - 0 Z 50 = O ; L Z 50 = O For 4 p radians the distance is 2mm The phase velocity 10 7 8 P 3 2 10 v 16 10 1.6 10 m / s 2 16 10 - - ? × p × = = = × = × p ß × 3. An analog signal is band-limited to 4kHz, sampled at the Nyquist rate and the samples are quantized into 4 levels. The quantized levels are assumed to be independent and equally probable. If we transmit two quantized samples per second, the information rate is ________ bits / second. (A) 1 (B) 2 (C) 3 (D) 4 Answer: - (D) Exp: - Since two samples are transmitted and each sample has 2 bits of information, then the information rate is 4 bits/sec. ?EC-Paper Code-B? GATE 2011 4. The root locus plot for a system is given below. The open loop transfer function corresponding to this plot is given by (A) ( ) ( ) ( ) ( ) ( ) s s 1 G s H s k s 2 s 3 + = + + (B) ( ) ( ) ( ) ( ) ( ) 2 s 1 G s H s k s s 2 s 3 + = + + (C) ( ) ( ) ( ) ( ) ( ) 1 G s H s k s s 1 s 2 s 3 = - + + (D) ( ) ( ) ( ) ( ) ( ) s 1 G s H s k s s 2 s 3 + = + + Answer: - (B) Exp: - 'x' ? indicates pole 'O' ? indicates zero The point on the root locus when the number of poles and zeroes on the real axis to the right side of that point must be odd 5. A system is defined by its impulse response ( ) ( ) n h n 2 u n 2 = - . The system is (A) stable and causal (B) causal but not stable (C) stable but not causal (D) unstable and non-causal Answer: - (B) Exp: - ( ) ( ) n h n 2 u n 2 = - ( ) h n is existing for n>2 ; so that ( ) h n 0;n 0 = < ? causal ( ) ( ) n n n n n 2 h n 2 u n 2 2 8 8 8 =-8 =8 = = - = = 8 ? ? ? ? System is unstable 6. If the unit step response of a network is ( ) t 1 e -a - , then its unit impulse response is (A) t e -a a (B) 1 t e - -a a (C) ( ) 1 t 1 e - -a - a (D) ( ) t 1 e -a - a Answer: - (A) Exp: - ( ) S t ? step response Impulse response ( ) ( ) ( ) ( ) t t d d h t S t 1 e e dt dt a a = = - = a 7. The output Y in the circuit below is always ‘1’ when × × × o j? s 0 1 - 2 - 3 - P Q R Y ?EC-Paper Code-B? GATE 2011 (A) two or more of the inputs P,Q,R are ‘0’ (B) two or more of the inputs P,Q,R are ‘1’ (C) any odd number of the inputs P,Q,R is ‘0’ (D) any odd number of the inputs P,Q,R is ‘1’ Answer: - (B) Exp: - The output Y expression in the Ckt Y PQ PR RQ = + + So that two or more inputs are ‘1’, Y is always ‘1’. 8. In the circuit shown below, capacitors C 1 and C 2 are very large and are shorts at the input frequency. i v is a small signal input. The gain magnitude o i v v at 10M rad/s is (A) maximum (B) minimum (C) unity (D) zero Answer: - (A) Exp: - In the parallel RLC Ckt L 10 H = µ andC 1nF = 7 g 6 9 1 1 10 rad/ s 10Mrad /s LC 10 10 10 - - ? = = = = × × So that for a tuned amplifier, gain is maximum at resonant frequency 9. Drift current in the semiconductors depends upon (A) only the electric field (B) only the carrier concentration gradient (C) both the electric field and the carrier concentration (D) both the electric field and the carrier concentration gradient Answer: - (C) Exp: - Drift current,J E = s ( ) n P J n p qE = µ + µ So that it depends on carrier concentration and electric field. ~ + - + - 2kO + 2 C 1 Q o v 1 C 2kO i v 2.7V 2kO 2kO 10 H µ 5V Page 4 ?EC-Paper Code-B? GATE 2011 1 Q. No. 1 – 25 Carry One Mark Each 1. Consider the following statements regarding the complex Poynting vector P for the power radiated by a point source in an infinite homogeneous and lossless medium. ( ) Re P denotes the real part of P . S denotes a spherical surface whose centre is at the point source, and ? ndenotes the unit surface normal on S. Which of the following statements is TRUE? (A) ( ) Re P remains constant at any radial distance from the source (B) ( ) Re P increases with increasing radial distance from the source (C) ( ) s Re P .ndS ?? remains constant at any radial distance from the source (D) ( ) s Re P .ndS ?? decreases with increasing radial distance form the source Answer: - (D) Exp: - ( ) S ˆ Re P .nds ?? gives average power and it decreases with increasing radial distance from the source 2. A transmission line of characteristic impedance 50O is terminated by a 50O load. When excited by a sinusoidal voltage source at 10GHz, the phase difference between two points spaced 2mm apart on the line is found to be 4 p radians. The phase velocity of the wave along the line is (A) 8 0.8 10 m /s × (B) 8 1.2 10 m / s × (C) 8 1.6 10 m /s × (D) 8 3 10 m /s × Answer: - (C) Exp: - 0 Z 50 = O ; L Z 50 = O For 4 p radians the distance is 2mm The phase velocity 10 7 8 P 3 2 10 v 16 10 1.6 10 m / s 2 16 10 - - ? × p × = = = × = × p ß × 3. An analog signal is band-limited to 4kHz, sampled at the Nyquist rate and the samples are quantized into 4 levels. The quantized levels are assumed to be independent and equally probable. If we transmit two quantized samples per second, the information rate is ________ bits / second. (A) 1 (B) 2 (C) 3 (D) 4 Answer: - (D) Exp: - Since two samples are transmitted and each sample has 2 bits of information, then the information rate is 4 bits/sec. ?EC-Paper Code-B? GATE 2011 4. The root locus plot for a system is given below. The open loop transfer function corresponding to this plot is given by (A) ( ) ( ) ( ) ( ) ( ) s s 1 G s H s k s 2 s 3 + = + + (B) ( ) ( ) ( ) ( ) ( ) 2 s 1 G s H s k s s 2 s 3 + = + + (C) ( ) ( ) ( ) ( ) ( ) 1 G s H s k s s 1 s 2 s 3 = - + + (D) ( ) ( ) ( ) ( ) ( ) s 1 G s H s k s s 2 s 3 + = + + Answer: - (B) Exp: - 'x' ? indicates pole 'O' ? indicates zero The point on the root locus when the number of poles and zeroes on the real axis to the right side of that point must be odd 5. A system is defined by its impulse response ( ) ( ) n h n 2 u n 2 = - . The system is (A) stable and causal (B) causal but not stable (C) stable but not causal (D) unstable and non-causal Answer: - (B) Exp: - ( ) ( ) n h n 2 u n 2 = - ( ) h n is existing for n>2 ; so that ( ) h n 0;n 0 = < ? causal ( ) ( ) n n n n n 2 h n 2 u n 2 2 8 8 8 =-8 =8 = = - = = 8 ? ? ? ? System is unstable 6. If the unit step response of a network is ( ) t 1 e -a - , then its unit impulse response is (A) t e -a a (B) 1 t e - -a a (C) ( ) 1 t 1 e - -a - a (D) ( ) t 1 e -a - a Answer: - (A) Exp: - ( ) S t ? step response Impulse response ( ) ( ) ( ) ( ) t t d d h t S t 1 e e dt dt a a = = - = a 7. The output Y in the circuit below is always ‘1’ when × × × o j? s 0 1 - 2 - 3 - P Q R Y ?EC-Paper Code-B? GATE 2011 (A) two or more of the inputs P,Q,R are ‘0’ (B) two or more of the inputs P,Q,R are ‘1’ (C) any odd number of the inputs P,Q,R is ‘0’ (D) any odd number of the inputs P,Q,R is ‘1’ Answer: - (B) Exp: - The output Y expression in the Ckt Y PQ PR RQ = + + So that two or more inputs are ‘1’, Y is always ‘1’. 8. In the circuit shown below, capacitors C 1 and C 2 are very large and are shorts at the input frequency. i v is a small signal input. The gain magnitude o i v v at 10M rad/s is (A) maximum (B) minimum (C) unity (D) zero Answer: - (A) Exp: - In the parallel RLC Ckt L 10 H = µ andC 1nF = 7 g 6 9 1 1 10 rad/ s 10Mrad /s LC 10 10 10 - - ? = = = = × × So that for a tuned amplifier, gain is maximum at resonant frequency 9. Drift current in the semiconductors depends upon (A) only the electric field (B) only the carrier concentration gradient (C) both the electric field and the carrier concentration (D) both the electric field and the carrier concentration gradient Answer: - (C) Exp: - Drift current,J E = s ( ) n P J n p qE = µ + µ So that it depends on carrier concentration and electric field. ~ + - + - 2kO + 2 C 1 Q o v 1 C 2kO i v 2.7V 2kO 2kO 10 H µ 5V ?EC-Paper Code-B? GATE 2011 10. A Zener diode, when used in voltage stabilization circuits, is biased in (A) reverse bias region below the breakdown voltage (B) reverse breakdown region (C) forward bias region (D) forward bias constant current mode Answer: - (B) Exp: - For Zener diode Voltage remains constant in break down region and current carrying capacity in high. 11. The circuit shown below is driven by a sinusoidal input ( ) i p v V cos t /RC = . The steady state output v o is (A) ( ) ( ) p V /3 cos t /RC (B) ( ) ( ) p V /3 sin t /RC (C) ( ) ( ) p V /2 cos t /RC (D) ( ) ( ) p V /2 sin t /RC Answer: - (A) Exp: - 0 2 i 1 2 v z v z z = + where 2 1 z R || j c = ? and 1 z R j c 1 = + ? ( ) 2 R z R jcw 1 = + Given i p 1 t w v v cos RC RC ? ? ? ? = = ? ? ? ? ? ? ? ? ? 2 R z 1 j ? = + 1 1 z R j c = + ? ( ) 1 R R 1 j jR = + ? - ( ) 0 i R v 1 1 1 j R v 1 2 3 R 1 j 1 j + = = = + + - + ~ i v R C C R + - o v + - 2 V Page 5 ?EC-Paper Code-B? GATE 2011 1 Q. No. 1 – 25 Carry One Mark Each 1. Consider the following statements regarding the complex Poynting vector P for the power radiated by a point source in an infinite homogeneous and lossless medium. ( ) Re P denotes the real part of P . S denotes a spherical surface whose centre is at the point source, and ? ndenotes the unit surface normal on S. Which of the following statements is TRUE? (A) ( ) Re P remains constant at any radial distance from the source (B) ( ) Re P increases with increasing radial distance from the source (C) ( ) s Re P .ndS ?? remains constant at any radial distance from the source (D) ( ) s Re P .ndS ?? decreases with increasing radial distance form the source Answer: - (D) Exp: - ( ) S ˆ Re P .nds ?? gives average power and it decreases with increasing radial distance from the source 2. A transmission line of characteristic impedance 50O is terminated by a 50O load. When excited by a sinusoidal voltage source at 10GHz, the phase difference between two points spaced 2mm apart on the line is found to be 4 p radians. The phase velocity of the wave along the line is (A) 8 0.8 10 m /s × (B) 8 1.2 10 m / s × (C) 8 1.6 10 m /s × (D) 8 3 10 m /s × Answer: - (C) Exp: - 0 Z 50 = O ; L Z 50 = O For 4 p radians the distance is 2mm The phase velocity 10 7 8 P 3 2 10 v 16 10 1.6 10 m / s 2 16 10 - - ? × p × = = = × = × p ß × 3. An analog signal is band-limited to 4kHz, sampled at the Nyquist rate and the samples are quantized into 4 levels. The quantized levels are assumed to be independent and equally probable. If we transmit two quantized samples per second, the information rate is ________ bits / second. (A) 1 (B) 2 (C) 3 (D) 4 Answer: - (D) Exp: - Since two samples are transmitted and each sample has 2 bits of information, then the information rate is 4 bits/sec. ?EC-Paper Code-B? GATE 2011 4. The root locus plot for a system is given below. The open loop transfer function corresponding to this plot is given by (A) ( ) ( ) ( ) ( ) ( ) s s 1 G s H s k s 2 s 3 + = + + (B) ( ) ( ) ( ) ( ) ( ) 2 s 1 G s H s k s s 2 s 3 + = + + (C) ( ) ( ) ( ) ( ) ( ) 1 G s H s k s s 1 s 2 s 3 = - + + (D) ( ) ( ) ( ) ( ) ( ) s 1 G s H s k s s 2 s 3 + = + + Answer: - (B) Exp: - 'x' ? indicates pole 'O' ? indicates zero The point on the root locus when the number of poles and zeroes on the real axis to the right side of that point must be odd 5. A system is defined by its impulse response ( ) ( ) n h n 2 u n 2 = - . The system is (A) stable and causal (B) causal but not stable (C) stable but not causal (D) unstable and non-causal Answer: - (B) Exp: - ( ) ( ) n h n 2 u n 2 = - ( ) h n is existing for n>2 ; so that ( ) h n 0;n 0 = < ? causal ( ) ( ) n n n n n 2 h n 2 u n 2 2 8 8 8 =-8 =8 = = - = = 8 ? ? ? ? System is unstable 6. If the unit step response of a network is ( ) t 1 e -a - , then its unit impulse response is (A) t e -a a (B) 1 t e - -a a (C) ( ) 1 t 1 e - -a - a (D) ( ) t 1 e -a - a Answer: - (A) Exp: - ( ) S t ? step response Impulse response ( ) ( ) ( ) ( ) t t d d h t S t 1 e e dt dt a a = = - = a 7. The output Y in the circuit below is always ‘1’ when × × × o j? s 0 1 - 2 - 3 - P Q R Y ?EC-Paper Code-B? GATE 2011 (A) two or more of the inputs P,Q,R are ‘0’ (B) two or more of the inputs P,Q,R are ‘1’ (C) any odd number of the inputs P,Q,R is ‘0’ (D) any odd number of the inputs P,Q,R is ‘1’ Answer: - (B) Exp: - The output Y expression in the Ckt Y PQ PR RQ = + + So that two or more inputs are ‘1’, Y is always ‘1’. 8. In the circuit shown below, capacitors C 1 and C 2 are very large and are shorts at the input frequency. i v is a small signal input. The gain magnitude o i v v at 10M rad/s is (A) maximum (B) minimum (C) unity (D) zero Answer: - (A) Exp: - In the parallel RLC Ckt L 10 H = µ andC 1nF = 7 g 6 9 1 1 10 rad/ s 10Mrad /s LC 10 10 10 - - ? = = = = × × So that for a tuned amplifier, gain is maximum at resonant frequency 9. Drift current in the semiconductors depends upon (A) only the electric field (B) only the carrier concentration gradient (C) both the electric field and the carrier concentration (D) both the electric field and the carrier concentration gradient Answer: - (C) Exp: - Drift current,J E = s ( ) n P J n p qE = µ + µ So that it depends on carrier concentration and electric field. ~ + - + - 2kO + 2 C 1 Q o v 1 C 2kO i v 2.7V 2kO 2kO 10 H µ 5V ?EC-Paper Code-B? GATE 2011 10. A Zener diode, when used in voltage stabilization circuits, is biased in (A) reverse bias region below the breakdown voltage (B) reverse breakdown region (C) forward bias region (D) forward bias constant current mode Answer: - (B) Exp: - For Zener diode Voltage remains constant in break down region and current carrying capacity in high. 11. The circuit shown below is driven by a sinusoidal input ( ) i p v V cos t /RC = . The steady state output v o is (A) ( ) ( ) p V /3 cos t /RC (B) ( ) ( ) p V /3 sin t /RC (C) ( ) ( ) p V /2 cos t /RC (D) ( ) ( ) p V /2 sin t /RC Answer: - (A) Exp: - 0 2 i 1 2 v z v z z = + where 2 1 z R || j c = ? and 1 z R j c 1 = + ? ( ) 2 R z R jcw 1 = + Given i p 1 t w v v cos RC RC ? ? ? ? = = ? ? ? ? ? ? ? ? ? 2 R z 1 j ? = + 1 1 z R j c = + ? ( ) 1 R R 1 j jR = + ? - ( ) 0 i R v 1 1 1 j R v 1 2 3 R 1 j 1 j + = = = + + - + ~ i v R C C R + - o v + - 2 V ?EC-Paper Code-B? GATE 2011 12. Consider a closed surface S surrounding volume V. If r is the position vector of a point inside S, with ? n the unit normal on S, the value of the integral s 5r.ndS ?? ? is (A) 3V (B) 5V (C) 10V (D) 15V Answer: - (D) Exp: - Apply the divergence theorem S v 5r.n.dx 5 .rdV = ? ?? ??? ( ) v 5 3 dv = ??? = 15 V ( ) .r 3 and r is the position vector ? = ? 13. The modes in a rectangular waveguide are denoted by mn mn TE TM where m and n are the eigen numbers along the larger and smaller dimensions of the waveguide respectively. Which one of the following statements is TRUE? (A) The TM 10 mode of the wave does not exist (B) The TE 10 mode of the wave does not exist (C) The TM 10 and the TE 10 modes both exist and have the same cut-off frequencies (D) The TM 10 and TM 01 modes both exist and have the same cut-off frequencies Answer: - (A) Exp: - 10 TM mode doesn’t exist in rectangular waveguide. 14. The solution of the differential equation ( ) dy ky, y 0 c dx = = is (A) ky x ce - = (B) cy x ke = (C) kx y ce = (D) kx y ce - = Answer: - (C) Exp: - Given ( ) y 0 C = and dy ky, dx = dy kdx y ? = kx c ln y kx c y e e = + ? = When ( ) y 0 C = , 0 1 y k e = ? ( ) kx 1 y c e k C = = ? 15. The Column-I lists the attributes and the Column-II lists the modulation systems. Match the attribute to the modulation system that best meets it Column-I Column-II P Power efficient transmission of signals 1 Conventional AM Q Most bandwidth efficient transmission of voice signals 2 FM R Simplest receiver structure 3 VSB S Bandwidth efficient transmission of signals with Significant dc component 4 SSB-SC (A) P-4;Q-2;R-1;S-3 (B) P-2;Q-4;R-1;S-3 (C) P-3;Q-2;R-1;S-4 (D) P-2;Q-4;R-3;S-1Read More

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