Sindh MDCAT 2019 Paper

161- In inelastic collision the kinetic energy before and after the collision ______ but the momentum of the system before and after the collision is ______.

A. Conserved… conserved
B. Changes… conserved
C. Changes… changes 
D. Conserved… changes  

Answer : B. Changes... conserved

162- Which statement describes the electric potential difference between two points in electric field of charge Q?

A. The difference of electric field between the points per unit charge.  
B. The ratio of the power dissipated between the points to the mass of charge.  
C. The work done in moving a test charge between points divided by magnitude of test charge. 
D. The force required to move a unit positive charge between the points per unit charge.  
 

Answer : C. The work done in moving a test charge between points divided by magnitude of test charge.

163- When an object is thrown upward, it rises to height h. How high is the object in terms of h, when it has lost 1/3 of its original kinetic energy?

A. h/2
B. h/3
C. h/4
D. h/6

Answer : B. h/3

164- The internal energy of the system decreases in an adiabatic process. Which of the following must be true regarding this process?

A. Heat flows out of the system
B. Work is done by the system
C. Work is done on the system
D. The potential energy of the system is changing  

Answer : B. Work is done by the system

165- If µo is permeability of the medium and so is permittivity of the medium then value of √1/µoco is equal to ______.

A. Planks constant
B. Speed of sound waves 
C. Speed of ultrasound waves
D. Speed of light

Answer : D. Speed of light

166- In a step up transformer ______.

A. Vs > Vp while ls > lp
B. Vs < Vp while ls > lp
C. Vs = Vp while ls > lp
D. Vs > Vp while ls < lp

Answer : D. Vs > Vp while ls < lp

167- If compressible medium has bulk modulus denoted by B and density denoted by ρ, then the Newton formula for speed of sound in medium is ______.

A. V=√B/p 
B. V=√Bρ  
C. V=Bρ
D. V=√ρ/B 

Answer : A. V=√B/p

168- In order to produce pair production the minimum energy of photon required is ______.

A. 1.02 KeV
B. 1.02 MeV
C. 10.2 KeV 
D. 1.00 MeV 

Answer : B. 1.02 MeV

169- The Bohr’s postulate for stationary orbits of Hydrogen atom is ______ Here m is mass of electron, v velocity, r orbital radius and h is Plank’s constant.

A. mr= nhv/2π 
B. mvr = nh/2π
C. mvr= nh/2πr
D. mv = nhr/2π 

Answer : B. mvr = nh/2π

170-A car starts from rest and moves with constant acceleration. During the 4th second of its motion, it covers a distance of 21 meters. The acceleration of the car is ______ ms\(^{-2}\).

A. 04
B. 06
C. 08
D. 16

Answer : B. 06

171- Which particle (marked A) is obtained in the following nuclear reaction? \[ 4Be^3 + 2He^4 \rightarrow 6Cl2 + A \]

A. A = 1n1
B. A = 1H
C. A = 1H1  
D. A = 2He2

Answer : A. A = 1n1

172- An electron is moving with velocity v and has momentum \( 3x10^{-26} \, \text{kg.m/s} \). The de Broglie wavelength associated with it is ______. Value of h = 6.63 x \( 10^{-34} \, \text{Js} \)

A. 22.1nm
B. 24.1nm
C. 22.1μm
D. 22.1mm

Answer : A. 22.1nm

173- The Laplace’s correction to Newton’s formula is based on the fact that the compressions and rarefactions occur as ______.

A. Adiabatic process
B. Isothermal process
C. Isochoric process
D. Isobaric process

Answer : A. Adiabatic process

174- A car of 500 Kg is travelling at a constant speed of 9 m/s around a curve of 100 m. What is the centripetal force?

A. 205N
B. 305N
C. 405N
D. 505N

Answer : C. 405N

175- When a train while whistling passes near you, a considerable change in the pitch of sound is heard. When the train is moving away, the pitch of the sound ______ whereas the pitch of the sound ______ when the train is approaching.

A. decreases… increases
B. increases… decreases  
C. increases… remains same
D. decreases… remains same

Answer : A. decreases... increases

176- The vector product of two vectors A and B is ______ vectors A and B.

A. equal to the product of magnitudes of  
B. in the plane parallel to
C. perpendicular to the plane containing
D. less in magnitude than the product of magnitudes of 

Answer : C. perpendicular to the plane containing

177- If a conductor carrying current I is placed in a uniform magnetic field B, it experiences a magnetic force F. The direction of this force F ______.

A. Is parallel to current I only
B. Is perpendicular to current I only  
C. Is perpendicular to magnetic field B only
D. Is perpendicular to both current I and magnetic field B 

Answer : D. Is perpendicular to both current I and magnetic field B

178- A battery of 12 volts is connected to three resistors of 4 Ohm, 5 Ohm, and 3 Ohm joined together in parallel. The current through the 3 Ohm resistance is ______.

A. 1.0 A
B. 2.5 A
C. 3.0 A
D. 4.0 A

Answer : D. 4.0 A

179- If the time interval between the occurrence of two events is measured in a frame with no relative motion in which two events occur, then the time t measured by an observer in a frame moving with relative velocity v is ______.

A. t=to/√1-√c  
B. t=to/√1-√c²
C. t=to/√1+√c²  
D. t=to/√√c² -1  

Answer : B. t=to/√1-√c²

180- A traveling wave, in which the particles of the distributed medium move parallel to the direction of propagation of the wave, is called:

A. Transverse wave 
B. Circular waves
C. Longitudinal wave
D. Stationary waves

Answer : C. Longitudinal wave

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