Physics - ENS BAMBILI | COMPETITIVE ENTRANCE EXAMINATION INTO THE FIRST YEAR OF THE SECOND CYCLE OF ENS BAMBILI

SAMPLE EXTRACT PAPER 2018

COMPETITIVE ENTRANCE EXAMINATION INTO THE FIRST YEAR OF THE SECOND CYCLE FOR 2017/2018

                                                    DEPARTMENT: PHYSICS                                                                                                                                                       DURATION: 4 HOURS

INSTRUCTIONS: Answer all questions! Select the correct answer to each of the questions in Section One, Two and Three, and write the corresponding letter (A, B, C or D) in the Answer Booklet provided. Section Four comprises two structured essay.

Make sure that you insert the question paper inside the Answer Booklet before you leave the examination hail!

SECTION ONE (40%)

Ql: A Carnot engine operates between 200° C and 20°C, Its maximum possible efficiency is:

[A] 90%,      [B] 100%,       [C] 38%,          [D] 10%.

Q2: Which of the following is not a state variable?

[D] Work, [B] Internal energy, [C] Entropy, [D] Temperature.

Q3: A rectangular loop of wire with dimensions 0.2 rn x 0.5 m is placed in a uniform magnetic field of magnitude 2 T. The magnetic field is perpendicular to the plane of the loop. What is the magnetic flux in the loop?

[A] 0.lWb,      [B] 0.2 Wb,       [C] 0.3Wb,       [D] 0.4 Wb.

Q4: There are 1000 turns in the secondary coil of a transformer and 500 turns in the primary coil. What will be the^ voltage across the secondary coil if an alternating voltage of 240 V is applied across the primary coil?

[D] 60V,        [B] 120 V,       [C] 480 V,          [D] 0 V.

Q5: A 80% efficient transformer gives an output of 15V and 4A. What is the input power?

[A] 12 W,     [B] 60 W,          [C] 75 W,          [D] 48 W.

Q6: A large tank of water, opened at the top, has a small hole through its side a depth h below the surface of the water. Give an expression of the speed of the water as it flows out the hole. [A] 1000gh     [B]            [C]               [D] 2hg

 Q7: A cork has a density of 200 kg/m³. The fraction of the volume of the cork that is submerged when the cork floats in water is  [A] 1/6                       [B] 1/5         [C] 1/4          [D] 1/3

Q8: For a given material, the. Young’s modulus is 2.5 times the rigidity modulus. Find its Poisson's ratio. [A] 0.25,            [B] 25,             [C] 6.25,                  [D] 0.4.

Q9: A capacitor of capacitance C₃ = 3.0µF withstands the maximum voltage V₁ = 4.0 KV, while a capacitor of capacitance C₂ = 6.0µF the maximum voltage V₂ = 3.0 KV. If they are connected in series what maximum voltage can the system withstand?

              [A] 7.0KV,          [B] 3.5KV,                   [C] 0.8KV,                     [D] 6.0KV.

Q10: A rocket of mass 1000 tons has an upward acceleration equal to 4.9 m/s². How many kilograms of fuel must be ejected per second at a relative speed of 2000 m/s to produce the desired acceleration. [A] 200Kg/s;      [B] 3.75Kg/s;        [C] 7500Kg/s;         [D] 0.1Kg/s.

Qll: Two parallel plates, each of area 1m², are separated by a distance 0.00lm and have a capacity of 0.1µF. What must be the dielectric constant of the material separating the plates?

[A] 11.3;            [B] 8.85;                [C|6.28;                    [D] 1.01

Ql2: Two capacitors of capacitances C₁ = 2µC and C₂ = 3µC charged to potential difference V₁ =6KV and V₂ = 5 KV are connected in parallel. Calculate the energy loss when the positive ends are joined.

             [A] 6J;          [B] 0.6J;            [C] 60J;             [D] 18J

Q13: Three equal resistors connected in series across a voltage source and dissipate 10 W of power. What would be the power dissipated, if the same resistors are connected in parallel across the same voltage source?

             [A] 1 0 W ;         [B] 30 W;      [C] 70W;       [D] 90W

Also Featuring: 

•  Physics Paper 2018
• Physics Paper 2015 
• Physics Paper 2014
• Physics Paper 2013
• Physics Paper 2010
• General Knowledge and Bilingualism
• General Pedagogy
• Structured Essay Questions
• Some Minor Papers
• Proposed Solutions to Some Physics Papers

NUMBER OF PAGES: 60

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