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7. Which of the following describes the metal center of an electromagnet? a. The Coil b. The Wire c. The Current 8. In most cameras, the location of the image is adjusted to appear on the film by changing the a. position of the lens c. shape of the lens b. diameter of the diaphragm d. focal length of the lens 9. A convex lens can correct: a. Astigmatism b. Farsightedness c. Nearsightedness d. All of the above 10 The human eye is like a camera and hence it contains a system of lens. The eye lens forms: a. an inverted image in front of the retina b. an inverted, real image of the object on the retina c. a straight or upright real image of the object on the iris d. a straight or upright, real image of the object on the retina 11. Light produced from heat is called a Fluorescent light b. Illuminated light c. Neon lights d. Incandescent light 12. Which of the following animals can see ultraviolet light? a. Dog b. Human c. Insect d. Monkey 13. Which of the following forms of electromagnetic waves is used mostly in communication? a. Gamma ray b. Infrared c. Radio wave d. X-ray 14. This type of EM is also called the penetrating radiation a. Microwave b. Radio wave c. UV light 15 Any agent that can cause harm or damage to humans, property, or the environment. a. Hazards b. Mitigation c Prevention d. Reduction 16. It is classified as a carcinogen by the WHO. a. Alpha radiation b. Beta radiation с. Gamma ray d X-ray 17. Which of the following is NOT and example of non-ionizing radiation? a. Microwave b. Ultraviolet Visible light d. X-ray 18. In a plane mirror, how does the reflected image appear? a. Slightly out of focus b. Closer than the actual object c. Upright and the same size as the object d. Upside down and much smaller than the object 19. Which of these objects would exhibit regular reflection? a. A sweater b. Dry asphalt c High-gloss paint d. Dashboard in a car 20. A boy is running at a speed of Sms towards a plane mirror The boy and his image in the mirror are the a Towards each other at a speed of 5 m/s b. Towards each other at a speed of 10 m/s c. Away from each other at a speed of 5 m/s d Away from each other ala speed of 10 m/s
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