ECAT and MCAT Preparation: Post your doubts here!

[hassam]

 

[alphabravocharlie]

37: D

how did you solve it?

 

[hassam]

When waves of two frequencies combine to make one
wave, this phenomenon is called
A. diffraction.
B. interference.
C. beats.
D. difference tones.

 

[smzimran]

CHECK THE FIRST POST PEOPLE.... UPDATED!!!

 

[leadingguy]

When waves of two frequencies combine to make one
wave, this phenomenon is called
A. diffraction.
B. interference.
C. beats.
D. difference tones.

beats C

it is a small topic in fsc physics book.

when two waves of slight phase diff. (diff. freq.) interfare they form waves of constructive and destructive interferance.. known as beats.

sounds of changing frequencies whch a person can hear, while standing at a fixed point are called beats.

the diff. between two varing frequecies leadind to the formation of a beat is the max. freq. of a beat that a person can hear; clearly.

 

[leadingguy]

who is giving pieas test here???

me and alpha bravo charlie any one else???

 

[hassam]

where ? u in islamabad?

 

[hassam]

Our sun releases energy by nuclear fusion reactions. What actually happens?
(A) Hydrogen is converted to helium
(B) Helium is converted to hydrogen
(C) Two nuclei change into one nucleus
(D) One nucleus splits into two nuclei
well this onwe will be C ryt....cos in option A hydrogen nuclei is not specified

 

[leadingguy]

Our sun releases energy by nuclear fusion reactions. What actually happens?
(A) Hydrogen is converted to helium
(B) Helium is converted to hydrogen
(C) Two nuclei change into one nucleus
(D) One nucleus splits into two nuclei
well this onwe will be C ryt....cos in option A hydrogen nuclei is not specified

YES THIS ONE WIL BE C NO DOUBT


AND NO i AM IN karachi BUT APPLIED THERE... WBU????

 

[Slash]

how did you solve it?

Sorry its B..
f(a.b) = f(a) + f(b)
F(2x1) = f(2) + f(1) =3
f(32) = f(8x4) = f(8) + f(4) = 12
or
f(16 x 2) = 18
or
f(32 x 1)= 33

but since 12 is the only available option out of three ,so i guess its B

 

[Goodfella]

Cube roots of unity

x^3 = 1

x^3 -1 =0

(x-1)(x^2 +x+1) = 0

can anyone tell me how did the term in the 3rd step came?

 

[Slash]

Cube roots of unity

x^3 = 1

x^3 -1 =0

(x-1)(x^2 +x+1) = 0

can anyone tell me how did the term in the 3rd step came?

term in the third step has came when u expand x^3 - 1^3 according 2 formula
a^3 - b^3 = (a - b)(a^2 +ab + b^2)


either

x-1 = 0
x=1

or


x^2 +x +1 =0

( Applying quadratic formula)

x = (1+Root(3))/2
it is called Omega

or

x = ((1-Root (3))/2
it is called omega square

Hence cube root of unity(1) are x = { 1, w , w^2} w = omega

 

[Goodfella]

thnx, nd you're an Fsc student?

 

[Slash]

thnx, nd you're an Fsc student?

Nahh ,I was, now I m in B.E(mech)
Just here to help others

 

[HIMYM forever!!]

me and alpha bravo charlie any one else???

I am, but i'm gonna be taking the test without studying a single word Because i spent a week at Pieas 'cause of Nptc training camp thingy, and well as a university pieas is pretty dull. I'm just taking the test 'cause my parents want me to

 

[leadingguy]

I am, but i'm gonna be taking the test without studying a single word Because i spent a week at Pieas 'cause of Nptc training camp thingy, and well as a university pieas is pretty dull. I'm just taking the test 'cause my parents want me to

hahaha same is the reason behind my appearance in the test bro.

 

[leadingguy]

hahaha same is the reason behind my appearance in the test bro.

nai sorry! not bro.

u are a girl rite !!!

 

[Slash]

Hoste

I am, but i'm gonna be taking the test without studying a single word Because i spent a week at Pieas 'cause of Nptc training camp thingy, and well as a university pieas is pretty dull. I'm just taking the test 'cause my parents want me to

Hostels are way to creepy there

 

[leadingguy]

Hoste

Hostels are way to creepy there

well hostel tou baad me ae ge.... phle we shud cum in the merit....
mene shayad yeh suna tha k karachi ka quota he only 3 seats..

 

[Slash]

IIEE is better from this point of view,, only 3rd Institution in south Asia which graduates u in Industrial and Electronic engineering,, but quota for Karachi is about 8 or 9 seats.. if anyone has domicile from other than Karachi , he/She should surely apply