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Home » Medical Papers » UHS MDCAT » Aptitude Test - 17
1.Molarity is defined as the number of moles of any substance dissolved:
A. Per dm3 of water
B. In one gram of water
C. Per m3 of water
D. Per dm3 of water
2.The value of universal gas constant is
A. 8.314 Jmol-1K-1
B. 8.324 Jmol-1 K-1
C. 7.23 Jmol-1K-1
D. 8.314 Jmol-1K-1
3.The turbine in a steam power plant takes steam from a boiler at 427 °C and exhausts into a low temperature reservoir at 77 °C. What is the maximum possible efficiency?
A. 50%
B. 40%
C. 60%
D. 50%
4.Which one of the following is a postulate of kinetic theory of gases?
A. Molecules do not exert force on each other
B. The size of molecules is much larger than separation between the molecules
C. A finite volume of gas consists of a very small number of molecules
D. Molecules do not exert force on each other
5.In electrolytic cell, a salt bridge is used in order to:
A. Pass the electric current
B. Prevent the flow of ions
C. Mix solution of two half cells
D. Pass the electric current
6.Which one is not an irreversible process?
A. Slow compression of a gas into a cylinder
B. Changes due to friction
C. Explosion
D. Slow compression of a gas into a cylinder
7.In all oxidation reactions, atoms of an element in a chemical species lose electrons and increase their:
A. Oxidation states
B. Reductions
C. Electrode
D. Oxidation states
8.SI unit of electric flux is
A. NmC-1
B. Nm-2 C-2
C. Nm2 C-2
D. NmC-1
9.In 'AgCl' solution. Some salt of NaCl is added, 'AgCl' will be precipitated due to:
A. Solubility
B. Electrolyte
C. Unsaturation effect
D. Solubility
10.The equivalent current which passes from a point at higher potential to a point at a lower potential as if it represented a movement of positive charges is
A. Electronic current
B. Electric current
C. Magnetic lines
D. Electronic current
11.‘Ka’ for an acid is higher, the stronger is the acid; relate the strength an acid with ‘pKa’
A. Higher pKa, weaker the acid
B. Lower pKa, stronger the acid
C. pKa has no relation with acid strength
D. Higher pKa, weaker the acid
12.It is experimentally found that a catalyst is used to:
A. Lower the activation energy
B. Increase the activation energy
C. Lower the pH
D. Lower the activation energy
13.If ‘V’ is applied potential difference across a resistance ‘R’, then loss in potential energy per unit time is
A. VI
B. I2 R
C. V2 /R
D. VI
14.According to collision theory of bimolecular reaction sin gas phase, the minimum amount of energy required for an effective collision is known as:
A. Heat of reaction
B. Rate of reaction
C. Has no effect on the reaction
D. Heat of reaction
15.The substances like germanium and silicon have
A. Negative temperature coefficients
B. Positive temperature coefficients
C. Both A and B
D. Negative temperature coefficients
16.The sensitivity of a galvanometer can be decreased by
A. Increasing magnetic field
B. Increasing number of turns of the coil
C. Increasing c BAN Ration
D. Increasing magnetic field
17.When elements of group II-A (alkaline earth metals) are exposed to air, they quickly become coated with a layer of oxide. What is the purpose of this oxide layer?
A. The oxide layer exposes the metal to Atmospheric attack
B. The oxide layer increases the reactivity of metal
C. The oxide layer protects the metal from further atmospheric attack
D. The oxide layer exposes the metal to Atmospheric attack
18.Force on a current carrying conductor in a uniform magnetic field is
A. F = NIA cos α
B. F = μnI
C. F = ILB sin α
D. F = NIA cos α
19.In silicon dioxide each silicon atom is tetrahedrally bonded to four oxygen atoms and each oxygen atom is bonded to two silicon atoms. The ratio of silicon to oxygen atoms is:
A. 2:2
B. 1:2
C. 2:1
D. 2:2
20.Hydrogenation of unsaturated oils is done by using:
A. Finally divided nickel
B. Finally divided iron
C. Vanadium pentaoxide
D. Finally divided nickel
21.In an electrochemical series, standard electrode potentials are arranged on the basis of:
A. pH scale
B. pOH scale
C. Hydrogen Scale
D. pH scale
22.Pick the correct statement:
A. Chelates are usually more stable than ordinary
B. Ordinary complexes are more stable than chelates
C. Monodentate ligands form the chelates complexes
D. Chelates are usually more stable than ordinary
23.The reaction which is responsible for the production of electricity in the Voltaic cell is:
A. Hydrolysis reaction
B. Oxidation reaction
C. Redox reaction
D. Hydrolysis reaction
24.In contact process, the catalyst used for the conversion of Sulphur dioxide to Sulphur trioxide is:
A. Magnesium oxide
B. Aluminum oxide
C. Silicon dioxide
D. Magnesium oxide
25.The unpolluted natural rain water is slightly acidic due to the reaction of rain water with:
A. Sulphur dioxide
B. Oxides of nitrogen
C. Carbon dioxide
D. Sulphur dioxide
26.Glucose is converted into ethanol by the enzyme _______ present in yeast:
A. Urease
B. Invertase
C. Sucrase
D. Urease
27.The rate of reaction involving ions can be studied by __________ method
A. Dilatometric
B. Refractometric
C. Optical rotation
D. Dilatometric
28.In the Haber's process for the manufacturing of ammonia, nitrogen is taken from:
A. Proteins occurring in living bodies
B. Ammonium salts obtained industrially
C. Air
D. Proteins occurring in living bodies
29.When one mole of gaseous hydrogen ions are dissolved in water to form an infinitely dilute solution, the amount of heat liberated is
A. -1891 kJmol-1
B. -1075 kJmol-1
C. -499 kJmol-1
D. -1891 kJmol-1
30.In comparison with oxygen gas, a strong triple bond is present between two nitrogen atoms in a molecule and therefore nitrogen gas is:
A. Highly reactive gas
B. Completely inert like noble gases
C. Very less reactive gas
D. Highly reactive gas
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