This quiz works best with JavaScript enabled. Home > Science > Physics > Physics Basics > Physics – Quiz 12 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Physics Quiz 12 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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. 2. When my velocity triples, my kinetic energy increases by ..... times. A) 9. B) 3. C) 1.5. D) 4.5. Show Answer Correct Answer: A) 9. 3. Which of the following are used in projectors? A) Concave lens. B) Convex mirrors. C) Plane mirrors. D) Convex lenses. Show Answer Correct Answer: D) Convex lenses. 4. 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. 5. 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. 6. What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N? A) 0.78. B) 0.51. C) 0.78 N. D) 0.58 N. Show Answer Correct Answer: B) 0.51. 7. Which energy transformation below occurs in a blow dryer? A) Electrical $\rightarrow$ thermal. B) Electrical-$\rightarrow$ chemical. C) Chemical-$\rightarrow$ thermal. D) Thermal $\rightarrow$ electrical. Show Answer Correct Answer: A) Electrical $\rightarrow$ thermal. 8. The energy that must be gained or lost for crystallization or melting to occur A) Thermal fusion. B) Thermal vaporization. C) Thermal equilibrium. D) Thermal expansion. Show Answer Correct Answer: A) Thermal fusion. 9. The SI base unit used to measure mass is the A) Meter. B) Kilometer. C) Gram. D) Kilogram. Show Answer Correct Answer: D) Kilogram. 10. Hydraulic machines work by applying A) Pascal's principle. B) Charles's law. C) Bernoulli's principle. D) Archimedes' principle. Show Answer Correct Answer: A) Pascal's principle. 11. Which of the following is a reflector of light? A) A) The sun. B) B) The moon. C) C) The star. D) D ) Fire. Show Answer Correct Answer: B) B) The moon. 12. 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) More than Q. B) Less than Q. C) Q. D) Can't tell. Show Answer Correct Answer: A) More than Q. 13. Why are convex mirrors used by drivers as rear view mirrors in vehicles? A) They reflect light better than other mirrors. B) They produce images which are clearer than those produced by others. C) They produce magnified images. D) They give a wide field of view. Show Answer Correct Answer: D) They give a wide field of view. 14. 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$. 15. In a velocity-time graph, the slope gives the A) Distance travelled. B) The time taken. C) The velocity (speed). D) The acceleration. Show Answer Correct Answer: D) The acceleration. 16. 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. 17. The equation for KE (kinetic energy) is: A) Mgh2. B) 1/2mgh. C) Mgh. D) 1/2mv2. Show Answer Correct Answer: D) 1/2mv2. 18. Formula for elastic potential energy A) Us = m*g*y. B) Us = $ \frac{1}{2} k*x^2$. C) Us = F*d. D) Us = W/t. Show Answer Correct Answer: B) Us = $ \frac{1}{2} k*x^2$. 19. The condition in which the temperature of 2 objects in physical contact with one another is the same A) Thermal fusion. B) Thermal vaporization. C) Thermal equilibrium. D) Thermal expansion. Show Answer Correct Answer: C) Thermal equilibrium. 20. ..... is equal to mass times acceleration A) Distance. B) Force. C) Work. D) None of above. Show Answer Correct Answer: B) Force. ← PreviousNext →Related QuizzesPhysics QuizzesScience QuizzesPhysics Quiz 1Physics Quiz 2Physics Quiz 3Physics Quiz 4Physics Quiz 5Physics Quiz 6Physics Quiz 7Physics Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books