Solved Past Papers MCQs of MDCAT for the preparation of Medical and Dental College Admission Test and other medical tests.
Q.51 Objects cannot be accelerated to the speed of light in free space is consequence of
A) Mass variation. C) Inertia forces.
B) Energy-mass relationship. D) All of these.
Q.52 A certain radioactive mass decays from 64 gm to 2 gm in 20 days. What is its half-life?
A) 5 days. C) 10 days.
B) 4 days. D) 6 days.
Q.53 If inductance is denoted by L and resistance by R, which of the following is true for a choke?
A) R is large, L is very small. C) Both R and L are large.
B) R is very small, L is large. D) Both R and L are very small.
Q.54 A force 2i + j has moved its point of application from (2,3) to (6,5). What is work done?
A) -10. C) -18.
B) +10. D) +18.
Q.55 The escape velocity corresponds to __________ energy gained by body, which carries it to an infinite distance from the surface of earth.
A) Total. C) Initial kinetic.
B) Potential. D) None of these.
Q.56 The drag force decreases as the speed of an object moving through fluid __________
A) Increases. C) Remains constant.
B) Decreases. D) Both B and C.
Q.57 Light year is a measure of
A) Distance. C) Intensity of light.
B) Time. D) Velocity.
Q.58 A yellow light of wavelength 500 mm emitted by a single source passes through two narrow slits 1 mm apart. How far apart are two adjacent bright fringes when interference is observed on a screen 10 m away?
A) 5 mm. C) 0.5 mm.
B) 1.33 mm. D) 50 mm.
Q.59 The heat produced by a current I in the wire of resistance R during time interval t is
A) I2/Rt. C) I2/R/t.
B) I2 D) IR2t.
Q.60 Which of the following is the most ductile?
A) Glass. C) Cast iron.
B) Copper. D) High carbon steel.
CHEMISTRY
Q.61 Which type of bonding is present in NH4Cl?
A) Ionic. C) Coordinate covalent.
B) Covalent. D) All of these.
Q.62 When CuSO4 is electrolyzed in aqueous solution using copper electrodes, then the substance which deposits at the cathode is:
A) Copper metal. C) Hydrogen.
B) Copper ions. D) Oxygen.
Q.63 Aldehydes can be synthesized by the oxidation of
A) Primary alcohols. C) Organic acids.
B) Secondary alcohols. D) Inorganic acids.
Q.64 The products of the fermentation of a sugar are ethanol and
A) Water. C) Carbon dioxide.
B) Oxygen. D) Sulfur dioxide.
Q.65 __________ serve as carriers of heredity from one generation to the other.
A) Lipids. C) Formaldehydes.
B) Caseins. D) Nucleoproteins.
Q.66 __________ extraction is controlled by partition law.
A) Iodine. C) Solvent.
B) Benzoic acid. D) Stationery.
Q.67 The process of effusion is best understood by __________ law.
A) Graham’s. C) Boyle’s.
B) Charles’s. D) None of these.
Q.68 __________ has dipole moment.
A) CO. C) Benzene.
B) CO2. D) All of these.
Q.69 __________ is used as catalyst in Haber’s process for NH3 gas manufacture.
A) Iron. C) Copper.
B) Carbon. D) Silver.
Q.70 In many of its properties __________ is quite different from the other alkali metals.
A) Li. C) Na.
B) Be. D) K.
Q.71 Which element forms long chains alternating with oxygen?
A) Carbon. C) Nitrogen.
B) Silicon. D) All of these.
Q.72 The percentage of carbon in medium carbon steel is
A) 0.7-1.5. C) 0.2-0.7.
B) 0.1-0.2. D) 1.6-2.00.
Q.73 Name the rare halogen among the following.
A) F. C) I.
B) Cl. D) At.
Q.74 Which bond will break when electrophile attacks an alcohol?
A) O – H. C) Both A and B.
B) C – O. D) None of these.
Q.75 The extent of un-saturation in a fat is expressed as its
A) Acid number. C) Saponification number.
B) Iodine number. D) None of these.
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