Sindh MDCAT 2022 Paper 141- The experimental proof of the particle nature of light is: A. pair productionB. photoelectric effectC. Davisson-Germer experiment D. de-Broglie concept View Answer Answer : B. photoelectric effect Description 142- The electrical energy dissipated as heat in a resistor is: A. V²RB. V²RtC. I²RD. 12Rt View Answer Answer : D. 12Rt Description 143- One kilowatt hour is equals to : A. 3.6×10^6 JB. 36×10^6 JC. 3.6×10^5 JD. 36×10^5 J View Answer Answer : D. 36×10^5 J Description 144- Unit joule per coulomb Is equals to : A. voltB. ampereC. teslaD. henry View Answer Answer : A. volt Description 145- According to law of radioactive decay , the of disintegration is directly proportional to: A. pressureB. density of substanceC. volume of substanceD. number of atoms present View Answer Answer : D. number of atoms present Description 146- The eddy current loss in a transformer can be reduced by : A. using thick copper coilsB. using thick non magnetic coreC. using laminating iron coreD. temperature View Answer Answer : C. using laminating iron core Description 147- The absolute gravitational P.E of an object of mass m on earth’s surface is given by: A. U=GME/R^2EB. U=-GmME/REC. U=-GME/R^2ED. U=GmME/RE View Answer Answer : B. U=-GmME/RE Description 148- The speed of photon in free space is A. 1/μ0ϵ0B. μ0ϵ0C. 1/√μ0ϵ0D. 1/2μ0ϵ0 View Answer Answer : C. 1/√μ0ϵ0 Description 149- A charge q is moving with velocity v, parallel to magnetic field B. the magnetic force F on charge q is: A. F=qvBsinøB. F=qVBC. F=qVBD. F=0 View Answer Answer : D. F=0 Description 150- Resistors of 5Ω and 10Ω are connected parallel if the P.D across 5Ωis 20volt then current through 10Ω will be : A. 0.5 ampereB. 2 ampereC. 4 ampereD. 10 ampere View Answer Answer : B. 2 ampere Description 151- A helicopter of weight ‘W’ is ascending with zero acceleration. The upward force F on it is: A. F > WB. F = √WC. F = 0D. F = W View Answer Answer : D. F = W Description 152- A sound wave travel from one medium to another which of following characteristics of sound remain unchanged: A. VelocityB. PitchC. QualityD. Wavelength View Answer Answer : B. Pitch Description 153- For efficient transfer of electricity through cables over the long distance : A. The current must be low and voltage highB. Both the current and voltage must be highC. The voltage must be zero and current lowD. The voltage must be low and current high View Answer Answer : A. The current must be low and voltage high Description 154- When a body moves with uniform velocity then it’s : A. Average velocity is zeroB. Instantaneous velocity is greater than average velocityC. Instantaneous velocity is zeroD. Instantaneous velocity is equal to average velocity View Answer Answer : D. Instantaneous velocity is equal to average velocity Description 155- Every particle of rotating disc moves with: A. Constant linear velocityB. Constant angular velocity C. Constant tangential velocityD. Constant linear displacement View Answer Answer : C. Constant tangential velocity Description 156- A proton of charge 1.6×10^-19 C is moved through a potential difference of 20 volt. The energy gained by the proton is A. ZeroB. 32 x 10^19 JC. 32 x 10^19 JD. -32 X 10^19 J View Answer Answer : B. 32 x 10^19 J Description 157- Distance between two consecutive antinodes in standing wave is A. 4/λB. λ/2C. 2λD. 3/2λ View Answer Answer : B. λ/2 Description 158- A conducting wire of resistivity 'p' is cut into two equal parts. The resistivity of each part will be: A. The sameB. One fourthC. HalvedD. Doubled View Answer Answer : A. The same Description 159- If a given spring of spring constant K is cut into three identical segments, the spring constant of each segment is: A. 1KB. 3KC. 4KD. K/3 View Answer Answer : B. 3K Description 160- Four cells of emf three volts are connected in series to form a battery. The net emf of the combination is: A. 9 VB. 12 VC. 7 VD. 3 V View Answer Answer : B. 12 V Description 1 2 3 4 5 6 7 8 9 10
