Physics MCQs thread.

[luckyboy]

please solve this question

 

[Zishi]

plz explain how to solve this

B?

 

[Abdulrab]

Q Nylon breaks when the stress within it reaches 1000000000 pa.
which range includes the heaviest load that couldbe lifted by a nylon thread of diameter 1mm ?

A. 2 N TO 20N
B. 20 N TO 200 N
C. 200 N TO 2000 N
D. 2000 N TO 20000 N


Guys i know the question is simple but i cant handle it !!! please solve it asap !!! thanks

 

[luckyboy]

i know its simple but can u tell me how this is B?

 

[Abdulrab]

no its C !!

 

[Zishi]

i know its simple but can u tell me how this is B?

First tell me what's the answer of the mark scheme? B?

 

[nidzzz09]

i know its simple but can u tell me how this is B?

First tell me what's the answer of the mark scheme? B?

Is cuz as yu go from rght to left through the spectrum the wave lenght increase :unknown:

 

[Zishi]

i know its simple but can u tell me how this is B?

First tell me what's the answer of the mark scheme? B?

Is cuz as yu go from rght to left through the spectrum the wave lenght increase :unknown:

Yep. Longest wavelength of ultra violet = 3 x 10^(-7)

Using speed of f times lambda, we get the answer as B.

 

[nidzzz09]

Q Nylon breaks when the stress within it reaches 1000000000 pa.
which range includes the heaviest load that couldbe lifted by a nylon thread of diameter 1mm ?

A. 2 N TO 20N
B. 20 N TO 200 N
C. 200 N TO 2000 N
D. 2000 N TO 20000 N


Guys i know the question is simple but i cant handle it !!! please solve it asap !!! thanks

answer D ?

 

[nidzzz09]

please solve this question

Even i wanna know this

The answer is D but i dunt know how to gt it

 

[nidzzz09]

the combined resistance is 2...so current n circuit = 12/(2+2)=3...now the current is divided in the ratio 1:2 between 6 ohm and 3 ohm resistor,,,hence I=1

i didnt get ya
ACn show the workin

 

[melon159]

R(effective of 6ohm & 3ohm)=2
total R of circuit=2+2=4 ohm
p.d is divided equally as resistance is 2 for both
in parallel combination(between 6 & 3 ohm resistors)V is same i.e 12/2=6v
now, using v=ir, we get 6=i x 6
which gives ---> i=1 Ampere

 

[Xthegreat]

M/J 07 Q23 ?

 

[melon159]

whats the answer?? is it D??

 

[Xthegreat]

yes

 

[intel1993]

hey can anybody plz explain me the question 21 from j2002......................

Q)A mass of liquid of density (p) is thoroughly mixed with an equal mass of another liquid of density(2p). No change of the total volume occurs...
Waht is the density of the liquid mixture?

A) 4/3 p
B) 3/2 p
C) 5/3 p
D) 3 p

 

[Xthegreat]

WHERE CAN I FIND THE MARKING SCHEMES OF PAPER 1 2001 AND 2002?

 

[Saturation]

How do you get the answer? I tried I=kA^2 , but i I get 4Io then! help!

EDIT : I figured it out.

 

[melon159]

A is wrong coz speed is max at q
since t is a progressive wave..no points are stationary...so option b is wrong
at point R,speed=0 so..no kinetic energy..only potential energy..C is wrong
S is the extreme point..here,v=0..and acceleration=max. ==> D is correct

 

[Saturation]

How is it 0! , can someones pls show me the directions in which the 3 forces must act in order to produce a resultant of 0!?