JUPEB: PHYSICS
Quizzes
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physics jupeb
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JUPEB 2015: PHYSICS – SCI-J155 – Multiple Choice Questions
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JUPEB 2015: PHYSICS – Essay Questions
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JUPEB 2016: PHYSICS: SCI-J155 – Multiple Choice Questions
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JUPEB 2016: PHYSICS – Essay Questions
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JUPEB 2016 PHYSICS: SCI-J155 – Multiple Choice Questions
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JUPEB 2019: PHYSICS – Multiple Choice Questions
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JUPEB 2019: PHYSICS – Essay Questions
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Question 1 of 8
1. Question
(a) From a consideration of the flow of a liquid through a narrow tube, define viscosity. Express the coefficient of viscosity η in terms of the internal frictional force F, surface area A of the liquid and velocity gradient !# and derive its units using dimensional analysis. (2 Marks)
(bi) Discuss qualitatively the motion of a small metal ball allowed to drop downwards in a long vertical tube of viscous liquid so that it moves along the axis of the tube. Sketch the variation of velocity v with time t. (3 Marks)
ii. Write down the equation relating the velocity v of a ball bearing of radius r and mass m falling vertically, from rest, in a viscous liquid after an elapsed time t. The effect of the buoyancy of the liquid should be neglected.
Obtain an expression for the terminal velocity v0 . [2 Marks]
(c) An object is thrown forward horizontally from the top of a cliff 20 m high with a horizontal velocity of 15 m/s. Calculate:
I. The time to return to the ground
ii. The horizontal distance from the foot of the cliff at which the object strikes the ground.[Take g = 10 m/s2]. (3 Marks)
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Question 2 of 8
2. Question
(a) A narrow beam of light traveling in air is incident on a slab of transparent material. The incident beam makes an angle of 40.0° with the normal, and the refracted beam makes an angle of 26.0° with the normal. (Refractive index = 1.00 for air).
Use Snell’s law of refraction to:
i. Find the index of refraction of the slab materials. (2 Marks)
ii. A ray of light, travelling in crown glass of refractive index 1.52, is incident on glass-air interface. Calculate the incident angle at which the total internal reflection begins to occur. (2 Marks)
iii. Draw a diagram to support your answer in (ii) above. (1 Mark)
iv. Explain the concept of total internal reflection (2 Marks)
(b) Complete the table of the image properties for converging and diverging lenses below: (3 Marks)
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Question 3 of 8
3. Question
(a) State Ohm’s law. (1 Mark)
(b) A battery of emf 24 V and internal resistance r is connected to a circuit having two parallel resistors of 3Ω and 6 Ω in series with an 8 Ω resistor.
The current flowing in the 3 Ω resistor is 0.8A. Calculate [6 Marks]
i. The current in the 6 Ω resistor.
ii. The internal resistance r of the battery.
iii. The terminal potential difference of the battery.
(c)i. Define the capacitance of a capacitor. [1 Mark]
ii. A capacitor carrying 10µC charge has a voltage of 50V across sits plates. Calculate its capacitance and the energy stored in it (2 Marks)
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Question 4 of 8
4. Question
(a) Define radioactivity. (1 Mark)
(b) Calculate the total binding energy of an alpha particle. The masses of the neutron, proton and alpha particles are respectively 1.008665 u, 1.007825 u. and 4.002603 u. (1u = 931.5 MeV/c2). (3 Marks)
(c)i. Define half-life of a radioactive substance. (1 Mark)
ii. Show that half-life T12=In2λ is the decay constant (2marks)
ii. A radioactive material has as initial activity of 7000 counts per second and an activity of 875 counts per second after 6 hrs. What is the half-life of the material? (3 Marks)
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Question 5 of 8
5. Question
(a) Differentiate between scalar and vector quantities and give two examples in each case. [3 Marks]
(b)i. At a stage in the lunch of a satellite, the force due to thrust is equal to the gravitational force. Determine the rate of change of the satellite’s momentum at that instant. (2 Marks)
ii. A truck accelerates uniformly from rest at 2 ms-2 for 10 s, maintains a steady velocity for 30 s, and is then brought to rest in 5 s under uniform retardation.
Calculate the total distance travelled by the truck. (2 Marks)
(c) A projectile is launched with an initial velocity of 35 m/s at an angle of 40o to the horizontal. Find
i. The maximum height attained
ii. Total time of flight
iii. Range
(Take g = 9.8m/s). ( 3 Marks)
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Question 6 of 8
6. Question
(a) State how three features of a thermo flask is used to heat loss. ( 3 Marks)
(b)i. State Zeroth law of thermodynamics. (1 Mark)
ii. Give an implication of this law. (1 Mark)
(c)i. A steel rod has a length of 30m at 0°C.
Calculate the length of the rod after it has been heated to 40°C, given that the linear expansion coefficient is 11 × 10-6/°C
ii. A 0.050 kg steel mass, heated to 200.0°C is dropped into a beaker containing 0.400 kg of water. The initial temperature of the water is 20.0°C and the final temperature with the steel is 22.4oC. Calculate the specific heat of the steel mass.
Assume the beaker has negligible heat capacity. Specific heat capacity of water = 4186 J/kgoC. (3 Marks)
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Question 7 of 8
7. Question
(a) Explain what is meant by a field of force. (1 Mark)
(b) State Coulomb’s Law. (1 Mark)
(c) A negative charge of 6.0×10-6 C exerts an attractive force of 65 N on a second charge that is 0.050 m away. What is the magnitude of the second charge? (3 Marks)
(£ = 8.85 x 1012 F/m)
(d) Find the currents I1, I2 and I3 in the circuit below. (5 Marks)
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Question 8 of 8
8. Question
(a) Explain the term wave-particle duality.
(bi)Write down, without proof, de Broglie`s relation
ii. A bullet of mass 20 g is moving with a speed of 300 ms-1. Calculate the de Broglie wavelength of the bullet. (3 Marks)
(c) Define the following: Photoelectric effect and work function. (2 Marks)
(d) The threshold frequency for a metal surface is 3×1014Hz, if the metal is illuminated with a radiation of 7.88eV. What is the kinetic energy of the electrons emitted from the metal surface?
[ Planck constant, h = 6.6 x 10-34 J.s, 1 eV = 1.602 x 10-19 J]. [3 Marks]
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