Physics MCQs thread.

[abdullah181994]

please explian

 

[unique840]

Others are easy, hassam. I saw these questions now. This one would be easy if my answer is correct. LOL

For densities one, I get their ratio as 2.25.

kese kia yeh ques? mjhe samjha do plx

 

[Hateexams93]

people how to find it out ? the answer is C , but how do u know ?

 

[Karimgenena]

the only force acting on the path is the force of gravity ( no horizontal forces acting) so answer is A (XV)

 

[abdullah181994]

the only force acting on the path is the force of gravity ( no horizontal forces acting) so answer is A (XV)

thanks

 

[abdullah181994]

 

[abdullah181994]

:%)

 

[abdullah181994]

:crazy: :%)

 

[Arshiful]

people how to find it out ? the answer is C , but how do u know ?

drawing a closed triangle that is a vector diagram helps this kinds of question, pls anyone correct me if i am wrong i did this by drawing a closed triangle as i learned that a closed triangle vector diagram represents a body to be in equilibrium and so my ans is C

 

[Arshiful]

pls explain the ans of this question Ans B explain it pls

 

[xHazeMx]

pls explain the ans of this question Ans B explain it pls

obviuosly, when the object is falling down, h decreases so D is wrong. as the object falls down its velocity increases. as the velocity increases, more distance is covered per second. mark equal intervals on each of the first 3 choices and see which graph coveres more and more distances as 1 interval passes. u will get B.

 

[Arshiful]

I managed to find the answer as efficiency doesnt have any unit so SI unit of both denominator and numerator cancel out
I know this isnt the right way to answer the mcq someone pls explain it in details...... ThNx Xhazemx for the previous answer...

 

[Talha]

Any1 plz tel me dat what wud be da values for horizontal and vertical components of acceleration for projectile and frefall motion... Plz sum1 explain asap .. Thnx

 

[ShootingStar]

A motorist travelling at 10ms–1 can bring his car to rest in a braking distance of 10 m.
In what distance could he bring the car to rest from a speed of 30ms–1 using the same braking
force?
A 17m B 30m C 52m D 90m

Answer is D.. how?

 

[unique840]

Any1 plz tel me dat what wud be da values for horizontal and vertical components of acceleration for projectile and frefall motion... Plz sum1 explain asap .. Thnx

acceleration to constant hoti hai 4 d whole motion. velocity change hoti hai sirf

 

[unique840]

A motorist travelling at 10ms–1 can bring his car to rest in a braking distance of 10 m.
In what distance could he bring the car to rest from a speed of 30ms–1 using the same braking
force?
A 17m B 30m C 52m D 90m

Answer is D.. how?

2*a*s = v^2 - u^2
2*a*10 = 0 - 10^2
a=5.

2*5*s = 0 - 30^2
s=90

 

[ShootingStar]

A motorist travelling at 10ms–1 can bring his car to rest in a braking distance of 10 m.
In what distance could he bring the car to rest from a speed of 30ms–1 using the same braking
force?
A 17m B 30m C 52m D 90m

Answer is D.. how?

2*a*s = v^2 - u^2
2*a*10 = 0 - 10^2
a=5.

2*5*s = 0 - 30^2
s=90

Thanks yaar.

 

[Talha]

even for da projectile motion acceleration is constant??

 

[unique840]

even for da projectile motion acceleration is constant??

pata nae yar. isi thread main kisi ne likha tha k acceleration k components nae hote. its constant. subah tk ka w8 karo. yahan k intelligent log is baat ka jawab denge

 

[unique840]

even for da projectile motion acceleration is constant??

isi thread k pg 27 par jo ques hai usmain projectile ki acceleration puchi hai. n the answer gvn is that it is constant