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- September 6th, 2013, 11:52 PM #41
what is meaning of CONTRADOW ?is this word really exists ??? I'm really confused ..please helpFebruary 26th, 2014, 09:27 PM #42February 26th, 2014, 09:47 PM #43
- Member Since
- Jul 2013
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What type of alpha particles produce ions in a GAS when they passed through it from radioactive elements
4) Neither cation nor Anion produced
Give answer it with Reason.
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How gama rays convert atoms of gas particles into ions? What types of gama rays produce ions in a gas?
As a short question give answer of this question and explain it with reason.March 13th, 2014, 07:51 PM #44
Can I also contribute MCAT questions in this link? For example, this one:
A student throws a rock at a 60° angle over a lake. The rock leaves his hand at a velocity of 20 m/s. How far away from the student will the rock shadow appear on the ground after 1 second, assuming the shadow projects straight down from the rock?
A) 5 m
B) 7 m
C) 10 m
D) 12 mMarch 20th, 2014, 08:22 PM #45
The answer is C. Because the question asks for the distance between the rock’sshadow and the student, the distance will be a horizontal distance. The horizontalvelocity of the rock is given by vx= v•cosθ= v•cos60o= v(1/2). Thus vx=10 m/s. So, distance x is given by x= (vx)(t)=10 m/s (1s)= 10 m.March 24th, 2014, 08:14 PM #46
Suppose that an object is lifted vertically each of the distances shown below at constant speed, in the time periods given.
Case I: 2m; 2 sec
Case 11: 4m; 1 sec
In which case is the average power employed greater?
A) case 1
B) case 2
C) Same in both cases
D) cannot be determined from the information givenJune 3rd, 2014, 10:47 PM #47
I am pre medical student and I have join this group to get some help about mcat entry test...June 4th, 2014, 02:37 PM #48
In eukaryotic cells, which of the following is a site of cellular respiration?
D) MitochondriaJuly 19th, 2014, 01:46 AM #49Originally Posted by M Amin Amjad
Power = Work done/time taken. Putting values in equation, case 2 has greater average power.
Can you post more questions? That would be great!January 22nd, 2015, 10:45 AM #50
Which (see image) of the following acids have the largest pKa?
Correct Answer: A
Recall that pKa = -log Ka so their relative values, because of the negative sign in the equation, are always opposite to each other. Thus in an acid base equilibrium, AH A- + H+, the largest pKa value is associated with the weakest acid. The unhalogenated carboxylic acid A is the weakest acid (acetic acid is the IUPACname; ethanoic acid is the systematic way to name it). In the other cases, the electron withdrawing halogen substituent stabilize the carboxylate conjugate base (anion) making the parent acid more acidic.
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Embryonic mesoderm in humans develops into which of the following structures?
A. Liver and pancreas
C. Lining of the respiratory tract
The mesoderm develops into muscle and connective tissue which includes blood and bone (skeleton!), as well as circulatory, reproductive and excretory organs. The ectoderm produces the epidermis and the nervous system including the brain. The endoderm will become the epithelial lining of the respiratory tract, and the digestive tract including the glands of the accessory organs (i.e. the liver and pancreas). The stage of the embryo where the 3 primary germ layers first develop is called the ‘gastrula’.February 1st, 2015, 08:28 AM #51
If the sum of all the forces acting on a moving object is zero, the object will:
A. decelerate and stop.
B. accelerate uniformly.
C. change the direction of its motion.
D. continue moving with constant velocity.February 3rd, 2015, 12:59 PM #52
All of the following quantities are vectors EXCEPT one. Which one is the EXCEPTION?
A. Electric current
B. Magnetic field
C. Electric force
D. Electric potential
Fields are vectors because they cause forces, and force is a vector. Current is a vector because charge can flow in either direction in a wire. However, electric potential is related to potential energy (PE = qV ), and all forms of energy are scalar quantities.
For more MCAT2015 sample questions, clickFebruary 25th, 2015, 02:52 AM #53February 25th, 2015, 05:56 PM #54
Explanation: For something to change direction or accelerate there must be a net force acting on it (Newton’s 2nd Law).
Also, Newton’s 1st Law states that an object in motion will stay in motion at constant velocity (a form of inertia) unless acted upon by a net (an unbalanced) force.March 17th, 2015, 10:33 AM #55
Oxidative phosphorylation is best described as:
A. the process in which ATP is formed as electrons are transferred fromelectron carriers to oxygen.
B. the process to repay the oxygen debt.
C. the process in which ATP is formed as pyruvate is convertedinto acetyl CoA.
D. the process in which ATP is formed as acetyl CoA is completely oxidized tocarbon dioxide.
Correct answer: A
Oxidative phosphorylation is defined by A; B may be true but it is aninadequate description of oxidative phosphorylation; C describes theintermediate step between glycolysis and the Krebs cycle; D describes the Krebscycle.Premed, MCAT scores and MCAT preparationApril 2nd, 2015, 10:26 AM #56
Choose the molecule that has the correct dipole orientation.
Correct Answer: B
The polarization of a bond is determined by the relative electronegativity of each particular atom. As Cl is more electronegative than a hydrogen atom, so the dipole moment points towards the Cl atom along the H-Cl bond. As a good memory guide, from your physics review, you would know that an electric field line always points away from a positive charge.Premed, MCAT scores and MCAT preparation
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