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AS Physics P1 MCQs Preparation Thread.

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Can anyone please help me with these 3 questions??? For the first one, isn't a complete wavelength the red line???So how is the answer BFullscreen capture 6132012 60742 PM.bmp.jpgFullscreen capture 6132012 60902 PM.bmp.jpgFullscreen capture 6132012 61012 PM.bmp.jpg
 
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how do v calculate the reading on a micrometer screw gauge in general? n also solve dis Questn pls....
 

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Q34
lets draw a diagram first View attachment 12820

now the resistance in each wire is 0.005 per meter so resistance in 1 wire is 800 * 0.005=4
so both wires have resistance 8

we can redraw the diagram and place the resistanc of the wires as 1 single resistor component
View attachment 12821

the resistance of the relay is 16/0.6= 26.6667

using equation v/E = R1/R1 + R2

so 16/E = 26.667/26.667 + 8 solve to get E is 20.8

Q27 i can't do

Q34 answer is B because i higher resistivity for same length and area means more resistance it can't be C because it doesn't fall that sharply

Q31 answer is A because when there is a current the electrons flow in the wire when there aren't they move absurdly as they orbit protons (if you took chemistry then remember metallic structre)

and next time post paper + ms
tyy i will but why cant in 31 why cant it be B i mean we use the idea in knowing emf of another batttery
 
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Can anyone please help me with these 3 questions??? For the first one, isn't a complete wavelength the red line???So how is the answer BView attachment 12930View attachment 12931View attachment 12932
no wavelength will be da first full block...see from where it starts and keep counting till it reaches da same point again...dis will be ur 1 wavelength..here they r asking for frequency...if u count da number of wavelngths there r 8...amplitude of each wave is 1.75 and time period is 10 so 8*1.75*10= 140
nxt question answer is A..just remember dat for velocities alone u just need to see dat if they are in opposite directions there will be a + sign and if both da velocities are in oposite direction then it will be negative so initial u will be added up and final will be subtracted :)
sory i hvnt done da last 1
 
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ok as it involves hieght we r gona take kinetic energy and potential energy too..
1/2 mu^2 = mgh
1/2 mv^2= (mgh /2) (cz its saya half hieght)
now divide them in da same form as given above...from left syd 1/2 cancels, m cancels out..from ryt syd m and g cancels out leaving us with u^2/ v^2 = 2/1
da question asks da ratio of v by u so invert da equation which gives v^2 / u^2 = 1/2 hence 2 remove da square root v/u=1/sq root of 2 which is C :p
thnks a tonne!
 
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