This quiz works best with JavaScript enabled. Home > Science > Physics > Physics Basics > Physics – Quiz 19 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Physics Quiz 19 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Light of a single wavelength is incident on a metal. Electrons are released. The intensity of the light is then increased.Which of the following changes occur? A) Rate of electron emission:increase.Energy of electrons:increase. B) Rate of electron emission:decrease.Energy of electrons:no change. C) Rate of electron emission:decrease.Energy of electrons:increase. D) Rate of electron emission:increase.Energy of electrons:no change. Show Answer Correct Answer: D) Rate of electron emission:increase.Energy of electrons:no change. 2. What is the specific latent heat of fusion? A) The amount of energy needed to melt 1 kg of a substance. B) The amount of energy needed to boil 1 kg of a substance. C) The amount of energy needed to condense 1 kg of a substance. D) None of above. Show Answer Correct Answer: A) The amount of energy needed to melt 1 kg of a substance. 3. Accelerations are produced by A) Forces. B) Velocities. C) Accelerations. D) Masses. Show Answer Correct Answer: A) Forces. 4. According to Newton's second law of motion, what is the relationship between acceleration and mass? Acceleration: A) Is directly proportional to mass. B) Is inversely proportional to mass. C) Does not depend on mass. D) Is always divided by mass. Show Answer Correct Answer: B) Is inversely proportional to mass. 5. Which SI base unit would you use to measure your height? A) M. B) Cm. C) Km. D) Dm. Show Answer Correct Answer: A) M. 6. Equation for gravitational potential energy A) Mass x gravitational force x height. B) Weight x gravitational force x height. C) Mass x gravitational force / height. D) Mass + gravitational force x height. Show Answer Correct Answer: A) Mass x gravitational force x height. 7. The symbol for specific latent heat is A) C. B) L. C) Q. D) M. Show Answer Correct Answer: B) L. 8. When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then the retardation will be: A) + 2 m/s2. B) -2 m/s2. C) -0.5 m/s2. D) + 0.5 m/s2. Show Answer Correct Answer: D) + 0.5 m/s2. 9. If a man's face is 25 cm in front of concave shaving mirror producing erect image 1.5 times the size of face, focal length of the mirror would be A) 75 cm. B) 25 cm. C) 15 cm. D) 60 cm. Show Answer Correct Answer: A) 75 cm. 10. Image formed by plane mirror is A) Real and erect. B) Real and inverted. C) Virtual and erect. D) Virtual and inverted. Show Answer Correct Answer: C) Virtual and erect. 11. Metals are good thermal conductors because: A) They contain particles. B) Metals are more dense. C) Metals contain free electrons. D) Metals conduct electricity. Show Answer Correct Answer: C) Metals contain free electrons. 12. Listening to your favorite radio station involves which area of physics? A) Optics. B) Thermodynamics. C) Vibrations and wave phenomena. D) Relativity. Show Answer Correct Answer: C) Vibrations and wave phenomena. 13. The name of the device we use to measure force is called: A) Force measurer. B) Newtonmeter. C) Newton-scale. D) Einstein Gauge. Show Answer Correct Answer: B) Newtonmeter. 14. If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed at a distance of 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is: A) 20 cm. B) 18 cm. C) 10 cm. D) 5 cm. Show Answer Correct Answer: C) 10 cm. 15. Photons of energy 2.1 eV cause a photoelectric currenton the surface of caesium, which has a workfunction of 1.9 eV. How many times should the energyof the photon be increased in order to double themaximum kinetic energy of the photoelectrons? A) 2.18. B) 1.09. C) 3.28. D) 4.36. Show Answer Correct Answer: B) 1.09. 16. What area of physics deals with the behavior ofsubatomic particles? A) Mechanics. B) Thermodynamics. C) Electrodynamics. D) Quantum mechanics. Show Answer Correct Answer: D) Quantum mechanics. 17. Which Branch of Physics is most important when studying how musical instruments work? A) Mechanics. B) Waves & Wave mechanics. C) Relativity. D) Electromagnetism. Show Answer Correct Answer: B) Waves & Wave mechanics. 18. The equation for PE (gravitational potential energy) is: A) Mgh2. B) Mgh. C) 1/2mgh. D) 1/2mv2. Show Answer Correct Answer: B) Mgh. 19. Hooke's law states that the extension of a spring is proportional to ..... A) Length of the spring. B) Spring constant. C) Elastic potential energy. D) Force applied. Show Answer Correct Answer: D) Force applied. 20. An object is removed from the ground and placed on a shelf. Which of its properties would you expect to change? A) Mass. B) Volume. C) Potential Energy. D) Kinetic Energy. Show Answer Correct Answer: C) Potential Energy. ← 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