This quiz works best with JavaScript enabled. Home > General Knowledge > Science > Physics > Physics Basics > Physics – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Physics Quiz 4 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the power required to lift a 10 kg object 5 m in the air in 2 s? A) 4 W. B) 25 W. C) 100 W. D) 250 W. Show Answer Correct Answer: D) 250 W. 2. Why is the sky blue? A) Because the atmosphere absorbs blue light and reflects the other colors. B) Because nitrogen and oxygen molecules scatter blue light more than the other colors. C) Because the ocean reflects its blue color to the sky. D) Because nitrogen and oxygen molecules scatter red and oranges away during the sunrise leaving blue for the day time. Show Answer Correct Answer: B) Because nitrogen and oxygen molecules scatter blue light more than the other colors. 3. Formula for work A) W = F*m. B) W = F/d. C) W = F*d. D) W = F/m. Show Answer Correct Answer: C) W = F*d. 4. MOLECULES ARE MADE UP OF A) VOLUME. B) MASS. C) ATOMS. D) SOLIDS. Show Answer Correct Answer: C) ATOMS. 5. Energy required to change the state of a mass of liquid to a gas is known as ..... A) Boiling Energy. B) Specific Latent Heat of Vaporisation. C) Specific Latent Heat of Fusion. D) Specific Heat Capacity. Show Answer Correct Answer: B) Specific Latent Heat of Vaporisation. 6. In an experiment, photoelectric effect is observed in metal A when light with frequency (f ) falls on the metal. If the light frequency used in this experiment is doubled, the photoelectrons A) Will be ejected with greater number of photoelectrons. B) Will be ejected as observed in the previous. C) Will not be ejected. D) Will be ejected with greater kinetic energy. Show Answer Correct Answer: D) Will be ejected with greater kinetic energy. 7. What causes a falling object to accelerate? A) Weight. B) Starting speed. C) Direction object is falling. D) Gravity. Show Answer Correct Answer: D) Gravity. 8. Speed of light in a vacuum is A) Represented by the symbol "c". B) 3.00 X108 m/s. C) Is constant. D) All answers are correct. Show Answer Correct Answer: D) All answers are correct. 9. What is air's index of refraction? A) 1.5-1.75. B) 1.33. C) 1.00. D) 2.42. Show Answer Correct Answer: C) 1.00. 10. FOR A SPHERICAL MIRROR ..... IS TRUE. A) FR = 1/2. B) R = 2f. C) FR = 2. D) F = 2R. Show Answer Correct Answer: B) R = 2f. 11. What particles make up light? A) Photons. B) Neutrons. C) Protons. D) None of above. Show Answer Correct Answer: A) Photons. 12. In a nuclear reaction, 5.265 x 10-10 J of energy is released. What is the mass defect of this reaction in kg? A) 4.74 x 107. B) 1.58 x 10-2. C) 1.76 x 10-18. D) 5.85 x 10-27. Show Answer Correct Answer: D) 5.85 x 10-27. 13. Momentum is ..... A) Velocity / mass. B) Mass x velocity. C) Mass x velocity2. D) Mass / velocity. Show Answer Correct Answer: B) Mass x velocity. 14. How much time would it take for the sound of thunder to travel at an average speed of 330 meters per second a distance of 8000. meters? A) 0.04 seconds. B) 2.4 seconds. C) 24, 000 seconds. D) 24 seconds. Show Answer Correct Answer: D) 24 seconds. 15. Ram travels at a speed of 20 km/hr while going to school. While coming back, he travels at a speed of 30 km/hr(due to less traffic). What his it's average speed? A) 24km/hr. B) 25km/hr. C) 26km/hr. D) Cant be determined. E) 20km/hr. Show Answer Correct Answer: A) 24km/hr. 16. Convert 78, 000 mm to m A) 0.78. B) 78. C) 780. D) 7.8. Show Answer Correct Answer: B) 78. 17. Particles are fixed, but vibrate in place in a A) Plasma. B) Gas. C) Liquid. D) Solid. Show Answer Correct Answer: D) Solid. 18. What is the SI base unit of time? A) The mean solar day. B) The second. C) The rate at which an atom ocillates. D) None of above. Show Answer Correct Answer: B) The second. 19. If you push a cart with a force of 60 N for 2 m ..... how much work have you done A) 120 N. B) 30 J. C) 120 J. D) 30 N. Show Answer Correct Answer: C) 120 J. 20. The liquid in a thermometer ..... as the temperature increases. A) Expands. B) Disappears. C) Freezes. D) Explodes. Show Answer Correct Answer: A) Expands. 21. Resistance can be calculated using ..... A) P.D. x Current. B) P.D. / Current. C) Current2 x P.D. D) Current / P.D. Show Answer Correct Answer: B) P.D. / Current. 22. Which quantity is base quantity? A) Electric current. B) Electric power. C) Electric energy. D) Potential difference. Show Answer Correct Answer: A) Electric current. 23. Why is the Sun considered the ultimate energy source? A) The Sun is the center of our solar system. B) The Sun provides energy for the water cycle and plants. C) The Sun is limited in the amount of energy released daily. D) The Sun rises and sets each day as seen from Earth. Show Answer Correct Answer: B) The Sun provides energy for the water cycle and plants. 24. When an object rolls over a surface. A) Sliding Friction. B) Rolling Friction. C) Fluid Friction. D) None of above. Show Answer Correct Answer: B) Rolling Friction. 25. What prefix is represented by the following symbol:k A) Kilo. B) Deci. C) Deka. D) Hecto. Show Answer Correct Answer: A) Kilo. 26. Convex Mirrors produce ..... A) Virtual or real images. B) Inverted images. C) Only virtual images. D) Only real images. Show Answer Correct Answer: C) Only virtual images. 27. Which was a limitation of the Bohr model of the atom? A) It was valid only for single electron atoms like Hydrogen. B) It stated that only certain energies were allowed for electrons. C) It described the electron as a wave and a particle. D) None of these. Show Answer Correct Answer: A) It was valid only for single electron atoms like Hydrogen. 28. A physicist who studies the behavior of submicroscopic particles is working in which area within physics? A) Quantum mechanics. B) Electromagnetism. C) Mechanics. D) Relativity. Show Answer Correct Answer: A) Quantum mechanics. 29. The formula that links weight, mass and gravitational field strength is A) W = m/g. B) G = Wm. C) M = Wg. D) W = mg. Show Answer Correct Answer: D) W = mg. 30. Arrange the numbers from least to greatest:216, 000, 000 ; 2.2 x 103 ; 3.1 x 107 ; 310, 000 A) 2.2 x 103 ; 3.1 x 107 ; 310, 000 ; 216, 000, 000. B) 2.2 x 103 ; 310, 000; 3.1 x 107 ; 216, 000, 000. C) 3.1 x 107 ; 310, 000; 2.2 x 103; 216, 000, 000. D) 310, 000 ; 2.2 x 103 ; 3.1 x 107; 216, 000, 000. Show Answer Correct Answer: B) 2.2 x 103 ; 310, 000; 3.1 x 107 ; 216, 000, 000. 31. Which SI base unit would you use to measure the time it takes to play a CD in your stereo? A) Cd. B) K. C) M. D) S. Show Answer Correct Answer: D) S. 32. If Anthony walks 1.7 km north from his house and then travels 5.4 km south, his displacement is A) 3.7 km south. B) 7.1 km south. C) 7.1 km north. D) 3.7 km north. Show Answer Correct Answer: A) 3.7 km south. 33. Work done = Force x blank? A) Speed. B) Velocity. C) Distance. D) Acceleration. Show Answer Correct Answer: C) Distance. 34. Some air is trapped inside a small balloon. The average kinetic energy of the air molecules in the balloon is increased. What remains the same? A) The density of the air in the balloon. B) The mass of the air in the balloon. C) The temperature of the air in the balloon. D) The volume of the air in the balloon. Show Answer Correct Answer: B) The mass of the air in the balloon. 35. When my velocity triples, my kinetic energy increases by ..... times. A) 3. B) 1.5. C) 9. D) 4.5. Show Answer Correct Answer: C) 9. 36. Which of the following are used in projectors? A) Convex mirrors. B) Convex lenses. C) Plane mirrors. D) Concave lens. Show Answer Correct Answer: B) Convex lenses. 37. An a.c motor is different from an a.c generator because A) C motor uses slip rings not a.c generator. B) C motor uses commutor not a.c generator. C) C motor uses left hand Fleming method to determine the direction of induce current and a.c generator uses right hand Fleming method. D) C motor uses right hand Fleming method to determine the direction of induce current and a.c generator uses left hand Fleming method. Show Answer Correct Answer: C) C motor uses left hand Fleming method to determine the direction of induce current and a.c generator uses right hand Fleming method. 38. They have an electric circuit that works with the help of cells. They provide accurate time. A) Pendulum clock. B) Sand clock. C) Quartz clock. D) Water clock. Show Answer Correct Answer: C) Quartz clock. 39. What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N? A) 0.58 N. B) 0.78. C) 0.51. D) 0.78 N. Show Answer Correct Answer: C) 0.51. 40. Which energy transformation below occurs in a blow dryer? A) Chemical-$\rightarrow$ thermal. B) Thermal $\rightarrow$ electrical. C) Electrical-$\rightarrow$ chemical. D) Electrical $\rightarrow$ thermal. Show Answer Correct Answer: D) Electrical $\rightarrow$ thermal. 41. The energy that must be gained or lost for crystallization or melting to occur A) Thermal fusion. B) Thermal equilibrium. C) Thermal vaporization. D) Thermal expansion. Show Answer Correct Answer: A) Thermal fusion. 42. The SI base unit used to measure mass is the A) Kilogram. B) Kilometer. C) Meter. D) Gram. Show Answer Correct Answer: A) Kilogram. 43. Hydraulic machines work by applying A) Pascal's principle. B) Archimedes' principle. C) Charles's law. D) Bernoulli's principle. Show Answer Correct Answer: A) Pascal's principle. 44. Which of the following is a reflector of light? A) A) The sun. B) B) The moon. C) D ) Fire. D) C) The star. Show Answer Correct Answer: B) B) The moon. 45. A metal rod is placed between a heat source at 200$^ \circ$C and a heat sink at 20$^ \circ$C. During time t, the amount of heat Q is transferred from the source to the sink. If the metal rod is replaced by another made of the same material twice as thick, determine how much heat will be transferred during the same amount of time t. A) Q. B) More than Q. C) Can't tell. D) Less than Q. Show Answer Correct Answer: B) More than Q. 46. Why are convex mirrors used by drivers as rear view mirrors in vehicles? A) They give a wide field of view. B) They produce magnified images. C) They produce images which are clearer than those produced by others. D) They reflect light better than other mirrors. Show Answer Correct Answer: A) They give a wide field of view. 47. Work done in changing the volume of a gas at a constant pressure is given by the equation: A) Work done $ =p\Delta V$. B) Work done $ =p\Delta C$. C) Work done $ work\ done\ =\ p\Delta T$. D) None of above. Show Answer Correct Answer: A) Work done $ =p\Delta V$. 48. In a velocity-time graph, the slope gives the A) The acceleration. B) The time taken. C) Distance travelled. D) The velocity (speed). Show Answer Correct Answer: A) The acceleration. 49. Which Branch of Physics is most important when studying how air conditioners cool your house? A) Mechanics. B) Optics. C) Thermodynamics. D) Electromagnetism. Show Answer Correct Answer: C) Thermodynamics. 50. The equation for KE (kinetic energy) is: A) 1/2mgh. B) Mgh. C) 1/2mv2. D) Mgh2. Show Answer Correct Answer: C) 1/2mv2. 51. Formula for elastic potential energy A) Us = $ \frac{1}{2} k*x^2$. B) Us = W/t. C) Us = m*g*y. D) Us = F*d. Show Answer Correct Answer: A) Us = $ \frac{1}{2} k*x^2$. 52. The condition in which the temperature of 2 objects in physical contact with one another is the same A) Thermal fusion. B) Thermal equilibrium. C) Thermal vaporization. D) Thermal expansion. Show Answer Correct Answer: B) Thermal equilibrium. 53. ..... is equal to mass times acceleration A) Distance. B) Force. C) Work. D) None of above. Show Answer Correct Answer: B) Force. 54. A 60W bulb uses 60J every second and is 5% efficient. How mush energy is WASTED? A) 3J. B) 5J. C) 57J. D) 60J. Show Answer Correct Answer: C) 57J. 55. THE CHANGE OF FOCAL LENGTH OF AN EYE LENSTO FOCUS THE IMAGE OF OBJECTS AT VARYING DISTANCE IS DONE BY THE ACTION OF ..... A) CILIARY MUSCLE. B) RETINA. C) BLIND SPOT. D) PUPIL. Show Answer Correct Answer: A) CILIARY MUSCLE. 56. Part of an atom which carry positive electric charges A) Neutrons. B) Electrons. C) Protons. D) None of above. Show Answer Correct Answer: C) Protons. 57. Formula for power A) P = E/t. B) P = W/t. C) P = W*t. D) P = E*t. Show Answer Correct Answer: B) P = W/t. 58. How far will an object move in 12 seconds if it is traveling at a velocity of 8 m/s? A) 4 m. B) 20 m. C) 0.7 m. D) 96 m. Show Answer Correct Answer: D) 96 m. 59. Branch of Physics that is concerned with the study of highly ionized gases-that is gases, that have been separated into positively and negatively charged particle. A) Mechanics. B) Acoustics. C) Plasma Physics. D) Atomic and Nuclear Physics. Show Answer Correct Answer: C) Plasma Physics. 60. Which of the following is something that a physicist would study? A) Gravity. B) Force. C) Friction. D) All of the above. Show Answer Correct Answer: D) All of the above. ← PreviousNext →Related QuizzesPhysics QuizzesScience QuizzesPhysics Quiz 1Physics Quiz 2Physics Quiz 3Physics Quiz 5Physics Quiz 6Physics Quiz 7Physics Quiz 8Physics Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books