G10 Science Unit Test PDF

## UNIT TEST in G10 SCIENCE (ELECTROMAGNETIC SPECTRUM, LIGHT and ELECTRICITY and MAGNETISM) Name: Abrahan, Roxy Mikaella. Grade & Section: 10 - Bell Date: 11/21/24 **A.IDENTIFICATION:** Choose the correct answer(s) from the word. | | |...

## UNIT TEST in G10 SCIENCE (ELECTROMAGNETIC SPECTRUM, LIGHT and ELECTRICITY and MAGNETISM) Name: Abrahan, Roxy Mikaella. Grade & Section: 10 - Bell Date: 11/21/24 **A.IDENTIFICATION:** Choose the correct answer(s) from the word. | | | | | |---------------------|-----------------------------------|---------------------|--------------------------------------| | Green | Frequency | Concave mirror | Electric motor | | Red | Microwaves | Convex Mirror 11 | Electromagnet | | Lenses | Concave Lens | Radio wave | Electromagnetism | | Generator 4 | Multiple image 9 | Concave Lens | Electromagnetic spectrum | | Inverted 18 | Lateral Inversion 16 | Telescope | Motor driven appliances. | | Upright | Hans Christian Oersted | James Clerk Maxwell | | | | | | | 1. The number of vibration that occur in 1 second. **Frequency** 2. In the visible spectrum, the color that has a longest wavelength is **red**. 3. A transparent material made of glass or plastic that refracts and focuses light rays at point. **lenses** 4. An application of Faraday's electromagnetic induction. 5. He formulated the Electromagnetic Theory. **James Clerk Maxwell** 6. It's a continuum of electromagnetic waves arranged according to frequency and wavelength. **Electromagnetic spectrum** 7. An EM waves make cellular telephones transmit and receive signals. **Microwaves** 8. A lens produces smaller and upright image. **Concave lens** 9. An examples of image produce in a kaleidoscope. 10. A type of EM waves has a wavelength similar to the size of PBA basketball court. **Radio wave** 11. A kind of mirror used in the side mirrors of automobiles and trucks to give the driver a wider area and smaller image. **Convex mirror** 12. An optical instrument uses 2 convex lenses to make a far away object larger. **Telescope** 13. A device that converts electricity into mechanical movement. **Electric motor** 14. He conducted an experiment that current-carrying wire can produce a magnetic field. **Hans Christian Oersted** 15. A principles explains how an electric motor works. 16 It explains why the word AMBULANCE is written in reverse in an ambulance car. **Convex mirror** 17. A kind of magnet can be made by making a coil of wire around a soft iron core and connect to voltage source. **Electromagnet** 18. A kind of image formed if the object distance is greater than the focal length. **Upright** 19. An optical instrument used by a medical students to examine the difference between animal and plant cell. **microscope** 20. The important contribution of Michael Faraday's electromagnetism. **Motor driven appliances** **B.MULTIPLE CHOICE:** Read the question carefully and choose the letter of the correct answer. 1. Which property spells the difference between the infrared and ultraviolet radiation? * **(D) None of these** 2. Electromagnetic waves are produced by * **(B) Vibrating Charges** 3. A person stands 2.0 m in front of the mirror. How far from the person is her image? * **(A) 3.5 m** 4. Where is the image located if an object is 30 cm in front of a concave mirror with a focal length of 20 cm. * **(C) At the center of curvature** **Bonus** * The fishbowl act as what type of mirror? * **(D) Beyond C** 5. Sun's rays are observed to focus at a point behind the fishbowl near the window. 6. Which of the following uses a concave lens? * **(C) Dentist's mouth mirror** 7. What transformation can take place in a ceiling fan's electric motor? * **(D) Electrical energy into mechanical energy** 8. How will you describe the magnetic field around a straight current-carrying wire? * **(D) The magnetic field is strongest near and around the wire.** 9. Where should an object be placed in front of a concave mirror so that the image will have the same size, inverted and real? * **(A) At F** 10. Calculate the frequency of light of wavelength 6x10^-7 m. * **(B) 5 x 10^15 Hz** 11. Where on the electromagnetic spectrum the visible light found? * **(C) Between Infrared rays and UV rays** 12. Which of the following is correctly arranged from HIGHEST to LOWEST energy? * **(B) Ultraviolet rays, visible light, radio wave** 13. A white sheet of paper cannot act as mirror because it ____ the rays of light. * **(A) Diffuses** 14. The image in a convex mirror is always * **(A) Virtual, erect, and diminished** 15. Which of the following tells the difference between lenses and mirrors? * **(C) Lenses refracts light, mirror reflect light.** 16. Convex lenses are use in * **(D) All of these** 17. Which of the following statement is CORRECT? * **(C) Gamma ray has the highest frequency and the highest energy.** 18. As frequency increases, wavelength * **(B) Decreases** 19. Why electromagnetic waves like gamma rays harmful to living things? * **(C) Because they carry very high amount of energy that enables them to penetrate and kill living cells.** 20. A man 130 cm tall stands 520 cm from a concave mirror. If the image could be formed on a screen 15 cm from the mirror, what is the size of the image? * **(A) -15.6 cm** 21. What can you infer on the relationship of wavelength and frequencies in the different regions of EM spectrum? * **(B) As the wavelength of a wave decreases, the frequency increases.** 22. Which of the following is NOT an application of ultraviolet light? * **(A) Used for reheating** 23. A light ray strikes a plane mirror at an angle of incidence of 10°. What is the angle of reflection? * **(A) 10°** 24. Which of the following mostly described the image seen in a plane mirror? * **(B) Virtual and upright** 25. Which describes the image formed by a concave mirror? * **(D) Real, inverted, and magnified** 26. All of the following made use of gamma rays except one. * **(A) Sterilization of water in drinking fountains.** 27. As indicated by the hands of the clock without numbers, the real time is 2:30. What is the time indicated in its image if the clock is placed in front of a plane mirror? * **(C) 2:30** 28. The diagram shows two divergent rays of light from an object O being reflected from a plane mirror. At which position will the image be formed? * **(B)** **29-30. (Show your solution) ** An object is placed at a distance 8 cm in front of a mirror with a focal length of 3 cm. Find the distance of the image formed in the mirror. * do = dxf * dixt * di = (8)(3) / 8-3 = 24/5 = 4.8 * do = 4.8 cm