ECAT and MCAT Preparation: Post your doubts here!

[leadingguy]

A


B ofcourse
If the book says A , its wrong!


B because the sign shows direction

No idea abt the last one!

al what I have done is the same but the disastrous book tooooo wrong atm

 

[smzimran]

yes no neutrons... as hydrogen atom does not have any neutron but have protons ... an any nucleus shud atleast have a proton...

Hmm, but its vague.....

 

[leadingguy]

in projectile motion the cmponent which remains constant is???

vertical velocity component
horizontal velocity compnent
both???

a body is lifted by a man to a highest point in 20 sec.

same body to same point is lifted again by another man in a time period of 60 sec.

wrk done ratio wil be??
1:2
2:1
1:1

man weights 980N in a lift. the lift moves upward with an accel. of 4.9ms-2
what wil be the weight now??
1470
490

 

[Zaryab]

in projectile motion, horizontal component of velocity remains constant only.


in the lift, man will weigh 1470 N. The apparent weight of man will increae.

 

[Zaryab]

the work done ratio will be 1:1. Work donot have any direct link with time but im not sure about it.

 

[leadingguy]

the work done ratio will be 1:1. Work donot have any direct link with time but im not sure about it.

same is what I am thinking book also has mentioned the same but m confused that why have they given times?? are these of no use here??

 

[leadingguy]

in projectile motion, horizontal component of velocity remains constant only.


in the lift, man will weigh 1470 N. The apparent weight of man will increae.

book saying both remains constant definately wrong

 

[hassam]

its none of these ryt????

 

[hassam]

sum and product of roots of quadratic equation

 

[HIMYM forever!!]

on which oof the following does the final shape of protien depends
a.primary structure
b.quarternary structure
c. both
d. none

in combustion analysis CO2 is absorbed in​

a-mg(ClO4)2​

b-lime water​

c-concentrated H​

2SO​

d-50%KOH ​

Insulin preparation comes under which branch of biology​

a) Social Biology​

b) Biotechnology​

c) Genetic Engineering​

d) Parasitology​

​

Unicellular Plasmodium is studied under the branch of biology called​

a) Microbiology​

b) Cell Biology​

c) Parasitology​

d) Pathology​

​

​

​

​

The answer to the combustion analysis question is D- 50% KOH
And the answer to the change in energy question is 0 J

 

[HIMYM forever!!]

the friction btween 2 surfaces depends upon yhe normal frce, it is independatnt of ?????

a) co-officient of kinetic energy
b) co-officient of static friction
c)area f contact between the two surfaces
d)friction

an acceleration of 1 ms-2 by a body of 1 kg is produced by the force of???

a)one pound
b)one newton

quantities which can be specified by a number havng apropriate units(positive negative. zero) are called..
a)scalers
b)vectors??

unit of solid of angle is???


a)steradian
b)radian
c)degree
d)radian-second


CAn any one clearify me these??? as i am too much confused aftr seeing ans. in ECAt book

Friction is independent of area of contact. I was pretty confused about this too about a month ago , but our Sir says that it is independent of area of contact

And solid angle's unit is "Steradian"

 

[HIMYM forever!!]

i cnt solve it.....shud i convert it to row echelon form.....
how.....wats the trick heere

The answer is 6
Method is exactly the same as i mentioned for the PIEAS sample question.

 

[leadingguy]

Friction is independent of area of contact. I was pretty confused about this too about a month ago , but our Sir says that it is independent of area of contact

And solid angle's unit is "Steradian"

well means increasing the surface area wil not cause any increae in resistance in moving the object?????

 

[HIMYM forever!!]

well means increasing the surface area wil not cause any increae in resistance in moving the object?????

Lol i don't exactly remember what the whole logic was behind it. I'll have to search my notes for it. I'll post the whole logic after 14th when i'm done with my practical exams

 

[hassam]

The answer to the combustion analysis question is D- 50% KOH
And the answer to the change in energy question is 0 J

its not 0 joules..........

 

[hassam]

well means increasing the surface area wil not cause any increae in resistance in moving the object?????

well increasing area must have an effect..........its so obvious.....how that teacher cn say no

 

[smzimran]

Q32:
X litres of carbon monoxide is present at S.T.P. It is completely oxidised to CO2. The volume of CO2 formed is 11.207 L at S.T.P. What value is of X in litres ?

A. 22.414 L
B. 11.207 L
C. 5.6035 L
D. 44.828 L

The answer is C but how ?

Q36:
The equivalent weight of a certain trivalent element is 20. Molecular weight of the oxide is
A. 168
B. 68
C. 152
D. 56

The answer is A but how ?

 

[hassam]

isnt this question wrong....none of option is matching.....my ans comes -4-4i

 

[hassam]

Q32:
X litres of carbon monoxide is present at S.T.P. It is completely oxidised to CO2. The volume of CO2 formed is 11.207 L at S.T.P. What value is of X in litres ?

A. 22.414 L
B. 11.207 L
C. 5.6035 L
D. 44.828 L

The answer is C but how ?

Q36:
The equivalent weight of a certain trivalent element is 20. Molecular weight of the oxide is
A. 168
B. 68
C. 152
D. 56

The answer is A but how ?

well 32 must be B ISNT it smz imran ....mayb book is wrong.....
and question 36 i dint. undrstnd.........molecular weight of of that trivalent elements oxide u are asking???

 

[smzimran]

isnt this question wrong....none of option is matching.....my ans comes -4-4i

Mine too!