ECAT and MCAT Preparation: Post your doubts here!

[Slash]

convex focal length of a lens is 40cm.
oncave focal length of a lens is 25cm the power of the combination in diopters is ...

a)-1.5
b) -6.5
c)=6.5
d)6.67

-1.5

 

[Slash]

I had used Dogar publisher books , and there wasn't that much errors

 

[leadingguy]

Angular momentum is associated with a particle in motion. The motion need not be rotational motion, but any motion. Importantly, it is measured with respect to a fixed point


Problem : A particle of mass, "m", moves with a constant velocity "v" along a straight line parallel to x-axis as shown in the figure. Find the angular momentum of the particle about the origin of the coordinate system. Also discuss the nature of angular momentum in this case.
Angular momentum is associated with a particle in motion. The motion need not be rotational motion, but any motion. Importantly, it is measured with respect to a fixed point.

nice explanation is this from intermediate book??

 

[leadingguy]

-1.5

thanx again the book is showing +6.5 option C... hope that the book is rong atm

 

[Slash]

nice explanation is this from intermediate book??

Nah..not a chance, inter books are nightmare.. i have my own mini digital library...
.. has collected almost all topics of my interest from web.

 

[leadingguy]

1. coversion of ferrenheight to kelvins ???

2. 1m = how many fts???


3. A hole in a p type semi conducter is???

a)an excess electron
b)a missing electron
c)a missing atom
d)a donor level??? (ans this wih explanation please)

 

[HIMYM forever!!]

1. coversion of ferrenheight to kelvins ???

2. 1m = how many fts???


3. A hole in a p type semi conducter is???

a)an excess electron
b)a missing electron
c)a missing atom
d)a donor level??? (ans this wih explanation please)

A missing electron, obviously. Because a hole is in fact a deficiency of electron.

 

[HIMYM forever!!]

Nah..not a chance, inter books are nightmare.. i have my own mini digital library...
.. has collected almost all topics of my interest from web.

You're doing your bachelors in ME from which university?

 

[Slash]

You're doing your bachelors in ME from which university?

NEDUET

 

[hassam]

yaar ye do lens....ki jo combined power theel....cn u explain to me that the genral method

 

[Slash]

1

yaar ye do lens....ki jo combined power theel....cn u explain to me that the genral method

1/f = 1/f1 + 1/f2

for concave lens focal length is taken as -ve... first calculate combine focal length (f) by above formula, then calculate power from it

 

[Slash]

1. coversion of ferrenheight to kelvins ???

2. 1m = how many fts???


3. A hole in a p type semi conducter is???

a)an excess electron
b)a missing electron
c)a missing atom
d)a donor level??? (ans this wih explanation please)

1. Farenhite should b convert to celsius first and then into Kelvin by adding 273
2. 1m = 3.28 fts
3. a missing electron

 

[Slash]

One Question that comes often in Entry Test is

At what temp the Fahrenheit scale and Celsius scale shows same reading

Ans is .. at -40

-40 c = -40 F

 

[Mustehssun Iqbal]

which book ( s ) are you people using??
smzimran
awesome initiative. thanks

 

[leadingguy]

now what do we understand by the term classical physics???

 

[leadingguy]

the ratio of kinetic energy to total energy of the electron in an hydrogen atom is according to Bohr's theory is
a)1:1
b)1:-1
c) 1:2

 

[HIMYM forever!!]

now what do we understand by the term classical physics???

Classical physics applies to Newtonian mechanics. It focuses on the theory that 'energy is continuous', which is true only at the macro level and not at the atomic and sub atmoic level.

 

[HIMYM forever!!]

One Question that comes often in Entry Test is

At what temp the Fahrenheit scale and Celsius scale shows same reading

Ans is .. at -40

-40 c = -40 F

Please keep posting such questions which usually come in entry tests. And oh yeah, thankyou

 

[leadingguy]

Classical physics applies to Newtonian mechanics. It focuses on the theory that 'energy is continuous', which is true only at the macro level and not at the atomic and sub atmoic level.

ans this one too

the ratio of kinetic energy to total energy of the electron in an hydrogen atom is according to Bohr's theory is
a)1:1
b)1:-1
c) 1:2

and this one

the shortest wavelength of lyman series series is approximately
a)820A
b)920A

i think the formula for wavelenght of lyman is applicable here... but m not reaching the ans so please verify ur ans by writing formula of lyman series.

 

[hassam]

oo yar mein ne lyman balmer series ka aik lafz bhi nae parha.......shukar hay yad karwa diya....what shud be angle b/w two plane mirrors for 3 images