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Ask Experts for IIT-JEE

Queries asked on Sunday and after 7 pm from Monday to Saturday will be answered after 12 pm the next working day.

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)]}

17 August 2019 10:20 PM

How to solve pulley problems

17 August 2019 07:29 PM
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