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# JEE Free Doubts and Solutions

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Asked by Surjitsp6u 20th August 2019, 12:12 AM

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## total amount of Rs. 1500 is to be distributed to 3 poor students A, B, C of a class. in how many ways the distribution can be made in multiplies of Rs. 100           i) if everyone of these must get at least Rs. 300?           ii). if A must get at least Rs. 500, B and C must get atleast Rs. 400 each?

Asked by rahmanklu 19th August 2019, 7:01 PM

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## 1) WHY SPACECRAFT HAVE NO WINGS? A)WINGS ARE REMOVED FROM SPACE ROCKET TO REDUCE WEIGHT B)WINGS STABILIZES THE AIRCRAFT IN VARIOUS AIR DRAG C)WINGS PROVIDE MORE MOMENTUM BY ITS WEIGHT TO FACE AIR DRAG 2)A micro controller worrks as a small brain which can directed by computer codes .RAM has developed a microcontroller which has 8 pins as shown in figure.(please refer image).Corresponding codes are given in the table( also refer  image).Black pin always give voltage = 0 V and white pin always provide-5 V  :: Controlelr read the instructions from up to down .Sample code for running a motor:QUESTION-which of the following is correct FOR BLINKING OF LED?" A) forever {           PM (purple,OUT) PM(yellow,IN) DW(purple,0) DW(yellow,1) wait(1) DW(purple,1) DW(yellow,0) wait(1)} B)  forever {           PM (purple,OUT) PM(yellow,OUT) DW(purple,0) DW(yellow,1) wait(1) DW(purple,0) DW(yellow,0) wait(1)} C)forever {           PM (purple,OUT) PM(yellow,IN) DW(purple,0) DW(yellow,1) wait(1) DW(purple,1) DW(yellow,1) wait(1)} D) ) forever {           PM (purple,OUT) DW(yellow,0) DW(purple,1) PM(yellow,OUT) wait(1) DW(purple,1) DW(yellow,1) wait(1)} 3)A micro controller worrks as a small brain which can directed by computer codes .RAM has developed a microcontroller which has 8 pins as shown in figure.(please refer image).Corresponding codes are given in the table( also refer  image).Black pin always give voltage = 0 V and white pin always provide-5 V  :: Controlelr read the instructions from up to down .Sample code for running a motor:QUESTION-IR sensor gives the value HIGH if an object comes infront of it while LOW when nothing is there.RAM is applying IR to make a parking indicator .The project is to make LED glow when a car is there while on the other hand it would not glow.WHICH OF THE FOLLOWING CODE IS CORRECT FOR THIS PURPOSE?" a)forever{ if (DR (pink)is HIGH)[ PM(purple,OUT) DW(purple,1)} else[ DW(purple,0)]} B)forever{ PM(pink,IN) PM(purple,OUT) if(pink is HIGH) DW(purple,1)} else[ DW(purple,0)]} C) forever{ PM(pink,IN) PM(purple,OUT) if (DR (pink)is LOW[ DW(purple,1)} else[ DW(purple,0)]} D) forever{ PM(purple,OUT) PM(pink,IN) if (DR (pink)is HIGH[ DW(purple,1)} else[ DW(purple,0)]}

Asked by ROZR7122 17th August 2019, 7:34 PM
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## How to solve pulley problems

Asked by prashant7632932731 17th August 2019, 4:15 PM
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## 1)There is an emitter that can send two type of signal.It can emmit a information in a packet of 4 signals.Howmany different type of information can be send by this emmitter?suppose A and B are two signals.One of the example information is given below-(please refer to FIG-1 in image ) a)2   b)4   C)6  D)8 2)JAGADAMBA has printed an Quadrilateral pyramid structure with the help of a 3D printer.Then to make it smaller he started to slice it parallel to one of the triangular side .what would be the shape of leftover part?(PLEASE refer TO FIG-2 for DIAGRAM in image) a)triangular pyramid b)truncated prism c)parallelpide d) right traingular prism 3)A micro controller worrks as a small brain which can directed by computer codes .RAM has developed a microcontroller which has 8 pins as shown in figure.(please refer FIG-3 in image).Corresponding codes are given in the table( also refer that fig-3 in image).Black pin always give voltage = 0 V and white pin always provide-5 V  :: Controlelr read the instructions from up to down .Sample code for running a motor:QUESTION-which of the following is correct regarding the connection of LED for this project?" A)",Small-Black Long Leg-Yellow" b)Small Leg-Blue Long Leg-White  c)Small-Yellow Long Leg-Blue  d)ALL of above pls answer asap sirr

Asked by srm63648 17th August 2019, 3:28 AM
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## Sir while solving ,plz tell me each term of formula being applied here and the calculations .

Asked by vishakhachandan026 16th August 2019, 7:47 PM
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## Please solve the problem in the picture as soon as possible.... with  steps.

Asked by miaowmira1900 16th August 2019, 1:35 AM
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## the equation of director cicrle of the parabola y^2=10(x-1)

Asked by khumansingh121317 15th August 2019, 7:48 PM
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## Please solve the problem in the image immediately... provide the steps.

Asked by miaowmira1900 15th August 2019, 5:39 PM
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## 1)WHICH OF FOLLOWING CAN BE USED IN THE ADD SUSPENSION SYSTEM IN ROVER? A)SYRINGE b)pencil c) button pen d)both a and c 2)WHY SPACE CRAFT HAVE NO WINGS? A)WINGS ARE REMOVED FROM SPACE ROCKET TO REDUCE WEIGHT B)WINGS PROVIDE MORE MOMENTUM BY ITS WEIGHT TO FACE AIRDRAG C)WINGS ARE USED TO MAKE AIRCRAFT LOOKS BETTER ONLY D)WINGS STABILIZES THE AIRCRAFT IN VARIOUS AIR DRAG 3)  RAM WANTS TO MAKE AN OBJECT THAT CANNOT BE DETECTED BY ROBOT WHO DETECTS ANY MATERIAL BASED ON PRINCIPAL  OF REFLECTION OF LIGHT. THIS PURPOSE CAN BE FULFILLED BY JUST PAINTING THE OBJECTS OUTER SURFACES WITH A COLOR Z .IDENTIFY Z?  A)RED B)WHITE C) BLACK D) BLUE 4)A SOLUTION OF OUR EXHALED AIR AND WATER WAS TESTED BY USING A pH SENSOR.WHAT WOULD BE THE RANGE OF pH sensor screen? a)less than 7 b) more than 7 c) depends on initial ph d)none

Asked by KUNDU3541 14th August 2019, 4:37 PM
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## Detailed solution for this.

Asked by g_archanasharma 16th December 2018, 6:20 PM
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## Detailed solution for this.

Asked by g_archanasharma 16th December 2018, 6:19 PM
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## Detailed solution for this.

Asked by g_archanasharma 16th December 2018, 6:18 PM
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## Detailed solution for this.

Asked by g_archanasharma 16th December 2018, 6:11 PM
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## Detailed solution for this.

Asked by g_archanasharma 16th December 2018, 6:09 PM
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## Sir pls solve this question.

Asked by rsudipto 15th December 2018, 6:13 PM
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## 2nd and 3rd

Asked by StarBoy 15th December 2018, 2:25 PM
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## Sir in this question how is the inverse fn derived. Pls explain in details.

Asked by rsudipto 15th December 2018, 8:55 AM
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## Sir pls solve this question.

Asked by rsudipto 14th December 2018, 9:52 AM
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## Sir pls solve this question.

Asked by rsudipto 14th December 2018, 9:51 AM
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