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) State the units and dimensions of the following quantities:
(i) Surface tension. (1 Mark)
(ii) Frequency. (1 Mark)
(iii) Show that the expression V2 = V02 + 2aS is dimensionally correct, where V and V0 represent the final and initial velocities, a is acceleration and S is. The displacement. (2 marks)
(b) A racecar moves such that its position is given as 0.75t2+5.0t+l. Find:
(i) the position at t = 4.00s (2 marks)
(ii) the instantaneous velocity of the car at t = 4.00s (2 marks)
(iii) the average velocity for the time interval t = 2.00s to 7.00s (2 marks)
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Question 2 of 8
2. Question
(a) State Pascal’s principle. (1mark)
(b) State two applications of:
(i) Surface tension (1 mark)
(ii) Viscosity. (1 Mark)
(iii) The electromagnetic poynting vector S is defined as S = E x H, where E and H are the electric and magnetic fields respectively. E = 10.101 + 0.20j + 0.60k and H = 0.4’0iĀ Ā +Ā Ā 9.80JĀ Ā +Ā Ā 0.10k.Ā Ā CalculateĀ Ā SĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā (3 marks)
(c) The mass of an object in air is 50g and it appears to have amassof35g when immersed in water. Find the:
(i) Relative density of the substance. (2 marks)
(ii) Density of the substance. (2 marks)
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Question 3 of 8
3. Question
(a) State any three assumptions of kinetic theory of gases. (3 marks)
(b) What is the pressure of 3 moles of an ideal gas at a temperature of 27Ā°C, having a volume of 5 litres? (2Ā½ Ā marks)
(c) A piece of copper of mass 0.04Kg at 16Ā°C is transferred into a copper calorimeter of mass 0.06Kg containing 0.05Kg of water at 20Ā°C. What will be the final temperature of the mixture? Specific heat capacity of copper and water are 400J/Kg/K and 4200J/Kg/K respectively. (Neglecting heat losses to the surroundings). (4Ā½ Ā marks)
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Question 4 of 8
4. Question
(a)i. State the principle of superposition of waves. (1 mark)
ii. Briefly describe Huygens principle with the aid of appropriate diagram. (2 marks)
(b) The manufacturer’s manual of a violin shows that the heaviest and lightest strings have linear densities of 6.0 and 0.58 kg/m respectively. Assuming that the strings are of the same material, determine the ratio of their radii. (3 marks)
(c) The voltage from an electromagnetic wave travelling on a transmission line is given by V(x,t) = 10e-a Sin(4Ļx109t – 30 Ļx)V where x is the distance in meters from the transmitter.
(i) Find the frequency, wavelength and phase velocity of the wave. (2 marks)
(ii)Find the voltage at x = 2.1xl0″2 cm and t = 0.32s, (1 mark)
(iii) If the amplitude of the wave is measured to be 2V, Find a. (1 mark)
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Question 5 of 8
5. Question
(a) Define electromotive force. (1 mark)
(b) A cell of e.m.f. E and internal resistance r was connected in series with two series external resistors, A (of 8-ohms) and B (of 2-ohms). A high resistance voltmeter connected across A was found to read 8volts. When another resistor C (of 8 ohms) was connected parallel to A, and then across A and C, the voltmeter read 6 volts.
(i) Draw the circuit diagrams of the two arrangements. (2 marks)
(ii) Calculate the internal resistance of the cell. (5 marks)
(iii) Calculate the e.m.f.Ā Ā of the cell. (l mark)
(c) Explain electrostatic induction and mention ONE method of producing electrostatic charge. (1 mark)
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Question 6 of 8
6. Question
(a) What is electrostatics? (1 mark)
(b) Explain, with the aid of a diagram, how you can charge a gold leaf electroscope positively, using the method of charging by induction. (4 marks)
(c) Two charges are located on the positive x-axis of a coordinate system. Charge q, = 2 x 10″9C is 2 cm from the origin, and charge q2 = 3 x 10″9 C is 4 cm from the origin.
What is the magnitude of the total force exerted by these two charges on a charge q3= 5 x 10′9C located at the origin?Ā Ā Ā Ā Ā Ā (5 marks)-
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Question 7 of 8
7. Question
(a) Calculate the total binding energy per nucleon of an alpha particle. The masses of the neutron, proton and alpha particles are respectively 1.008665u, 1.007825uĀ and 4. 004603 u. (3 marks)
(b)i. Radium with an atomic mass of 226, has a half-life of 800 years. For 0.5g of radium, calculate the number of decays per second. (4 marks)
(ii) Define half-life of a radioactive sample. Ā© Which of the following radiations: Ī±-rays, b-rays and Ī³-rays:
(i) are similar to X-rays? ( Ā½ mark)
(ii) are easily absorbed by matter? ( Ā½ marks)
(iii) travels with the greatest speed? ( Ā½ marks)
(iv) are similar in nature to cathode rays? ( Ā½ marks)
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Question 8 of 8
8. Question
(a)i. State four (4) properties of X-rays. (2 marks)
ii. State four (4) uses ofĀ X-rays. (2 marks)
(b) (i) Calculate the minimum wavelength of X-ray that can be produced by an electron accelerate by a potential differenceĀ of 20Ā kV between the electrodes. (2 marks)
(ii) Write down the mathematical form of Bragg’s law and explain each term. (2 marks)
(iii) Determine the wavelength of the x-ray that was Bragg-diffracted by a cobalt crystal of interatomic spacing of 4.07×10-10 m, if the first-order scattering angle is 24Ā°. (2 marks)
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