for class 9th of physics 5054 · eoy exam paper of last year ( 2017 -18 ) for class 9th of physics...

North Nazimabad Girls Campus

EOY Exam Paper of last year (2017-18)

For Class 9th of Physics 5054

This document includes section A (mcqs) and B (theory) of last year paper. Kindly Practic each question. The Answer key has also been uploaded.

convert minute into seconds to get answer in sec as options are only given in seconds.so 1 min 55 seconds = 115 seconds. so 115.20 seconds - 45.20 seconds = 70 seconds

60 times 3.6km track. that means total distance is 3.6 * 60 = 216.for average speed = total distance/ total time.216 km / 2.4 hr = 90 km /h

4N is small enough to cant be resultant of two 3N and 4N vectors

fact

we can clearly see thevolumes of two boxes aredifferent.

And spring balance showssame pointer at 3N meansboth blocks have sameweight and if you divide by gyou ll get same mass

since the pans of balance is at samelevel. we know the rock has same weightas of the masses kept at other side ofbalance i.e. 23N

question is asking of mass in kg howeverso to get mass, we ll divide weight by g toget mass. thus, 23/10 = 2.3 kg

At one side of pivot two forces of 100 N to right and left arebeing exerted. we ll estimate torque for each to see whosetorque is bigger. the handle will move at that side only. theforce with more distance from pivot will have more torqueso definitely the handle will move anticlockwise as force tothe left is bigger)

( A third downqard force is also exerted but we ll notconsider it doesnt satisfy condition of torque. just assume ifyou ll push on door from upward in downward direction,just as in figure, would it rotate? no!

Calculate yourself by principle ofmoments and seew whether your answergets matched.

see the behavior of graph.

only option relating to pressure. shoe sink into ground becauseof high pressure( force on less area as spikes will resuce thearea of contact greatly)

76 cm of hg is atmospheric pressure.

A B

A is the point where gas pressure acts.Alternatively we can calculate pressure at Bto calculate gas pressure. at point B, asshown in diagram, 76cm - 8 cm is 658 cm ofhg. Indeed gas presssure is lower than thatof atmospheric pressure.

because gravitational potential energy at Y is zero. so doesnt make adifference to add it here in the equation.

We have already studied that max potential energy at top most height ofraised bob in pendulum gets converted to its maximum kinetic energy atbottom part ( which is Y here). In real cases however there are heatlosses to o to consider (As written in equarion)

calculate yourself. be careful about quantities.

work = F * d

Power = Work / time

conductor. free electrons