PHYSICS EXAM.pdf

ETHIOPIAN HIGHER EDUCATION INSTITUTIONS REMEDIAL PROGRAMME (2022/2023) PHYSICS EXAMINATION BOOKLET TIME ALLOWED: 3 hrs. Name:______________________ ID No:_______ Section:__________ =========================================== This booklet consists of three...

ETHIOPIAN HIGHER EDUCATION INSTITUTIONS REMEDIAL PROGRAMME (2022/2023) PHYSICS EXAMINATION BOOKLET TIME ALLOWED: 3 hrs. Name:______________________ ID No:_______ Section:__________ =========================================== This booklet consists of three items of different types: choice, blank space, and work out. Hence, you are required to attempt them all and give your answers clearly on a separate sheet provided to you. Do not forget to write your full name and Identification Number on all pages and the answer sheet. ========================================== If it’s necessary, you can use the following given value Gravity = Mass of electron 1 I. CHOOSE THE BEST ANSWER FOR EACH QUESTION 1. The dot product of Vector and is ____________. A. 8 C. 12 B. 4 D. 24 2. Which one of the following statement is correct? A. The work done by a non-conservative force on a particle moving between any two points is independent of the path taken by the particle. B. The work done by a non-conservative force on a particle moving through any closed path is zero. C. The work done by a conservative force on a particle moving through any closed path is zero. D. The work done by a conservative force on a particle moving between any two points is dependent of the path taken by the particle. 3. Which one of the following statement is correct according to transversal wave particle motion? A. Particles of the disturbed medium oscillate perpendicular to the direction of wave motion. B. Particles of the disturbed medium oscillate parallel to the direction of wave motion. C. Particles of the disturbed medium oscillate elliptical to the direction of wave motion. D. Particles of the disturbed medium oscillate circular to the direction of wave motion. 4. If the speed of sound in air is 300m/s, what is the wave length of sound wave at 500 Hz? A. 1.7 m C. 17 m B. 0.6 m D. 6 m 5. A car moving along the x-axis starts from the position when and stops at when. What the average of velocity during this interval of time? A. C. B. D. 2 6. Which one of the following statement is correct? A. An inelastic collision is a collision in which both kinetic energy and linear momentum are conserved. B. An inelastic collision a collision in which only kinetic energy is conserved. C. An elastic collision is a collision in which both kinetic energy and linear momentum are conserved D. An elastic collision is a collision in which only kinetic energy is conserved. 7. If and. What is the vector product of the two vectors ? A. C. B. D. 8. Which one of the following is correct according to the relation between coefficient of volume expansion and coefficient of linear expansion? A. C. B. D. 9. Three resistances are connected as figure below. What is the equivalent of the resistances? A. 4 Ω C. 8Ω B. 0.4 Ω D. 0.8 Ω 10. Which one of the following statement is correct? A. Like charges attract each other and unlike charges repel each other. B. Unlike charges attract each other and like charges repel each other. C. Charge is not conserved. D. Charge is not quantized. 3 11. How long will a current of 4 A take to pass 100C of charge? A. 0.04 s C. 0.25 s B. 25 s D. 4s 12. Which one of the following statement is correct? A. Faraday’s Law states that the size of the induced electromotive force is inversely proportional to the rate of change of magnetic flux. B. Lenz’s Law states that, the direction of the induced electromotive force is always such as to oppose the change of magnetic flux. C. Coulomb’s Law which states that, the magnitude of the electrostatic force between two point charges is inversely proportional to the magnitudes of the two charges. D. Newton’s Law of Universal Gravitation states that, every object in the universe attracts every other object with a force that is inversely proportional to the product of the masses of the particles. 13. A charge of 10 C is in an electric field of. What is the force acting on the charge? A. 50 N C. 2 N B. 0.5 N D. 15 N 14. According to first law of thermodynamics, which one of the following statement is correct? A. The internal energy of the system can be increase when the work is done by the system and heat added on the system. B. If the system is an isolated system, the internal energy of the system is not constant. C. If the process is an adiabatic process, the internal energy of the system is equal to the work done by the system. D. The internal energy of the system can be increase when the work is done on the system and heat added on the system. 15. Which one of the following statement is incorrect? A. The magnitude of torque is depending on the size of the force. B. The magnitude of torque is depending on the moment arm of force. C. The magnitude of torque is depending on the line of action of force. D. The magnitude of torque is independent of the line of action of force. 4 16. Vector has magnitude of 4 units and makes an angle of 450 with the positive x-axis. Vector also has the same magnitude of 4 units and directed along the positive x-axis. Which one of the following statement is correct? A. The horizontal component of the resultant vector is 2.83 units. B. The vertical component of the resultant vector is 6.83 units. C. The magnitude of resultant vector is 7.4 units. D. The direction of resultant vector is. 17. The SI unit of angular momentum is ______________. A. N m C. Nms B. D. 18. According to electric field line properties, which one of the following statement is NOT correct? A. The magnitude of charge and the number of field lines are inversely proportional to each other. B. The field lines never intersect with each other. C. The field lines are perpendicular to the surface of the charge. D. The field strength is proportional to the concentration of the lines. 19. According to Ohm’s law, which one of the following is proportional constant? A. Voltage C. Resistance B. Current D. Voltage and current 20. Calculate the increase in length of a 50cm brass road that is heated from C to C. brass=. A. C. B. D. 21. A 10 F capacitor is charged to the voltage which has 6 V. How much energy does it contain? A. C. B. D. 22. The SI unit of angular acceleration is______. A. C. B. D. 5 23. A flywheel of mass 5 kg consists of a flat uniform disc of radius 2 m. It pivots about the central axis perpendicular to its plane. What it’s the moment of inertia? A. C. B. D. 24. The amount of damping that leads to the oscillator settling back to the stationary state at the equilibrium position in the shortest possible time is__________. A. Under damping C. Critical damping B. Over damping D. Light Damping 25. A block of mass m is initially at rest on a horizontal surface with static coefficient of frictional force. A horizontal force of F is required to set the block in motion as the figure below. What is the value of static coefficient of the block? A. C. B. D. 26. Two point charges, one of 4 C and the other of 3 C are placed 2 m apart. What is the force which acts, between them? A. C. B. B. D. 27. What is the cause of refraction wave changes in its direction when it passes from one medium to another medium? A. Speed C. Amplitude B. Frequency D. Acceleration 28. Which one of the following is non-contact force? A. Gravitational force C. Friction force B. Air resistance force D. Tension force 6 29. A 1 kg mass undergoes an acceleration given by. What is the magnitude and direction of the force? A. 5 N and C. 5 N and B. 50 N and D. 50 N and 30. If an electron in copper near the lowest possible temperature has a kinetic energy of , what is the speed of the an electron? A. C. B. D. 7 II. FILL IN THE BLANK SPACES WITH CORRECT ANSWERS 31. Unit vector of the given vector is_______________________. 32. ____________________is a disturbance which does not require a material medium for its propagation. 33. _______________ is the cancelling out of oscillations caused by the superposition of two waves that are in antiphase. 34. If are connected in a series form. The equivalent capacitance of the two capacitor is__________________. 35. ___________________is the maximum displacement from the equilibrium position of the wave. 36. A copper resistor ( ) whose value is 20 Ω at 0 is warmed from that temperature up to 100. The resistance of the copper after its hot is____________. 37. If copper cable has cross sectional area of a length of , and resistivity. The resistance of the cable is _______________________. 38. _______________is defined as the time rate of energy transfer. 39. A force act at a displacement of. The torque produced by the force is________________. 40. A flywheel spins 100 times each minute. The angular velocity of this flywheel is _____________________. 41. The strength of magnetic field produced by a current-carrying wire is depends on: i. ________________________________. ii. ________________________________. iii. ________________________________. 42. The strength of magnetic field in a solenoid depends on: i. ________________________________. ii. ________________________________. iii. ________________________________. 8 III. WORK OUT ITEM 43. An object which has 2 kg oscillates with simple harmonic motion along the x-axis. Its position varies with time according to the equation. Where t is in second and the angle is in radian. A. Determine the amplitude, frequency, and period of the motion. B. Calculate the velocity and acceleration of the object at any time t. C. Determine the maximum position, maximum speed, and maximum acceleration of the object. D. Calculate the total energy of an oscillator at a maximum displacement 44. A 1500 kg car is at rest on a frictionless hill inclined at. A. Sketch a free-body diagram of the car motion. B. Find the car’s acceleration when it is released and normal force acting on the car. C. If the hill is 55 m long, what would be the car’s final velocity at the bottom of the hill? D. How long will it take for the car to reach the end of the hill? 45. A projectile is fired in such a way that its horizontal range is equal to four times its maximum height. What is the angle of projection? 9  Name:______________________ ID No:__________ Section:_________ I. ANSWER SHEET FOR MULTIPLE CHOICE ITEM 1. _____________ 2. _____________ 3. _____________ 4. _____________ 5. _____________ 6. _____________ 7. _____________ 8. _____________ 9. _____________ 10. ____________ 11. ____________ 12. ____________ 13. ____________ 14. ____________ 15. ____________ 16. ____________ 17. ____________ 18. ____________ 19. ____________ 20. ____________ 21. ____________ 22. ____________ 23. ____________ 24. ____________ 25. ____________ 26. ____________ 27. ____________ 28. ____________ 29. ____________ 30. ____________ II. ANSWER SHEET FOR BLANK SPACE ITEM 31. __________________ 32. __________________ 33. __________________ 34. __________________ 35. __________________ 36. __________________ 37. __________________ 38. __________________ 39. __________________ 40. __________________ 10  41. i. ___________________________________________ ii. ___________________________________________ iii. ___________________________________________ 42. i. _______________________________________ ii. _______________________________________ iii. _______________________________________ III. ANSWER SHEET FOR WORK OUT ITEM 43. 11 44. 12 45. 13