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# Multiple Choice Questions **Instructions:** Answer the following multiple-choice questions. **Question 41:** What is the focal length of an astronomical telescope whose eyepiece has a focal length of 20 cm, and which has a magnification of 10? A. 200 cm B. 2 cm C. 0.5 cm D. 0.005 cm **Question...

# Multiple Choice Questions **Instructions:** Answer the following multiple-choice questions. **Question 41:** What is the focal length of an astronomical telescope whose eyepiece has a focal length of 20 cm, and which has a magnification of 10? A. 200 cm B. 2 cm C. 0.5 cm D. 0.005 cm **Question 42:** A compound microscope has a 95 magnification and an objective lens that is 1/38 of a centimeter away from the target. The objective lens's focal length is ½ cm. What is the eyepiece's magnification? A. 5 B. 10 C. 100 D. 200 **Question 43:** How does a periscope work? A. It magnifies distant objects using multiple lenses. B. It measures the angles of light rays to calculate distances. C. It analyzes the spectrum of light to identify chemical elements. D. It reflects light using multiple mirrors to view objects above the observer's line of sight. **Question 44:** What needs to be adjusted to raise a simple microscope's angular magnification? A. Object size B. Lens aperture C. Power of the lens D. Focal length of the lens **Question 45:** What happens to the image captured by the pinhole camera when the back wall is moved away from the pinhole? A. Larger and fainter B. Larger and brighter C. Smaller and fainter D. Smaller and brighter **Question 46:** Which component in an electric generator transforms mechanical energy into electrical energy? A. Rotor B. Stator C. Turbine D. Commutator **Question 47:** Which type of current do electric generators typically produce? A. Direct current B. Pulsating current C. Alternating current D. Unstable current **Question 48:** How does an electric generator differ from an electric motor? A. An electric generator produces DC current, while an electric motor produces AC current. B. An electric generator is used for industrial purposes, while an electric motor is used for domestic purposes. C. An electric generator converts electrical energy to mechanical energy, while an electric motor converts mechanical energy to electrical energy. D. An electric generator is driven by an external mechanical energy, while an electric motor converts electrical energy into mechanical energy. **Question 49:** In what form is the mechanical energy input usually provided to turn the rotor in an electric generator? A. Wind energy B. Solar energy C. Electrical energy D. Mechanical energy **Question 50:** Why is it that a DC motor is still used in industrial applications? A. It is cheap B. It has no replacement C. It is simple in construction D. It provides fine speed control **End of Test** *"In Everything We Do, GOD Be Glorified"*