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7.2 - 7.3
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7.2/7.3 Hinge Question 2.7.3 Decimal Addition7.2.2 to 7.3.1 ReviewT5 B7.2 & 7.3 Think Teen 2 7/3Yonsei 1-2 7-37.2.1 Critical Angle 1. The critical angle is the angle of incidence at which the refracted ray: A. Bends toward the normal B. Bends away from the normal C. Travels along the boundary D. Is totally reflected Answer: C 7.2.2 Snell’s Law & Critical Angle 2. Which formula correctly represents the critical angle c when light travels from medium 1 to medium 2? A. n1cosc=n2 B. n2sinc=n1 C. n1sinc=n2 D. n1sinc=n2sin90∘ Answer: D 7.2.3 Total Internal Reflection 3. Total internal reflection occurs only when: A. Light travels from air to glass B. Angle of incidence is less than the critical angle C. Light travels from a denser to a rarer medium D. Refractive index of the second medium is greater Answer: C 4. Which condition is not required for total internal reflection? A. Light must travel from a denser medium B. Angle of incidence must exceed the critical angle C. Refractive index of second medium must be lower D. Light must strike at 90° Answer: D 7.2.4 Ray Diagrams & Angle Calculations 5. A ray in water (n = 1.33) hits the surface at 40°. Critical angle = 48.8°. What happens? A. Refraction only B. Total internal reflection C. No refraction D. Light stops Answer: A 7.2.5 Snell’s Law in Glass Blocks & Prisms 6. A ray enters glass (n = 1.5) from air at 30°. Which statement is correct? A. It bends away from the normal B. It bends toward the normal C. It travels straight D. It undergoes total internal reflection Answer: B 7. In a prism, the deviation of light occurs mainly because: A. Light slows down in glass B. Light speeds up in glass C. Light reflects internally D. Light cannot pass through glass Answer: A 7.2.6 Mirages 8. A mirage appears on a hot road because: A. Light reflects off the sky B. Light refracts through layers of air with different densities C. Light undergoes dispersion D. Light travels in straight lines only Answer: B 7.2.7 Dispersion Through a Prism 9. Dispersion occurs because: A. All colors refract equally B. Different wavelengths refract differently C. The prism reflects light D. White light cannot be refracted Answer: B 7.2.8 Rainbow Formation 10. A rainbow is formed due to: A. Refraction only B. Total internal reflection only C. Dispersion only D. Refraction + TIR + dispersion Answer: D 7.2.9 Optical Fibers 11. Optical fibers work mainly due to: A. Refraction B. Diffraction C. Total internal reflection D. Dispersion Answer: C 12. Which is an advantage of optical fibers? A. High signal loss B. Immune to electromagnetic interference C. Very heavy D. Slow data transmission Answer: Bتمام يا شيما 🌸 سأقوم الآن بإنشاء **اختبار جاهز بالكامل بصيغة Quizalize** مع: ✔ الأسئلة ✔ الإجابات الصحيحة ✔ خيارات الإجابة ✔ التغذية الراجعة (Feedback) لكل سؤال ✔ يمكنك نسخه ولصقه مباشرة داخل Quizalize بدون أي تعديل الاختبار مناسب **للصف الثاني – رياضيات – الجمع والطرح – Unit 1**. --- # 🎯 **Quizalize Ready Test – Grade 2 Math (Addition & Subtraction)** ## **Title:** Unit 1 – Addition and Subtraction ## **Grade:** 2 ## **Subject:** Math --- # ✅ **Question 1 (Multiple Choice)** **What is 5 + 3 ?** Options: A) 6 B) 7 C) 8 ✔ D) 9 **Correct Feedback:** ✔ Great job! 5 + 3 = 8. **Incorrect Feedback:** ✘ Try again. Count forward from 5. --- # ✅ **Question 2 (Multiple Choice)** **What is 9 – 4 ?** Options: A) 3 B) 5 ✔ C) 6 D) 4 **Correct Feedback:** ✔ Well done! You subtracted correctly. **Incorrect Feedback:** ✘ Try again. Use your fingers to take away 4 from 9. --- # ✅ **Question 3 (Multiple Choice)** **Which addition sentence is correct?** Options: A) 4 + 4 = 10 B) 6 + 2 = 8 ✔ C) 7 + 3 = 15 D) 5 + 1 = 9 **Correct Feedback:** ✔ Correct! 6 + 2 = 8. **Incorrect Feedback:** ✘ Not correct. Try checking each answer carefully. --- # ✅ **Question 4 (Word Problem)** **Sarah has 6 apples. Her mother gives her 3 more. How many apples does she have now?** Options: A) 7 B) 8 C) 9 ✔ D) 10 **Correct Feedback:** ✔ Great! 6 + 3 = 9. **Incorrect Feedback:** ✘ Think again. Try drawing 6 apples, then adding 3. --- # ✅ **Question 5 (Word Problem – Subtraction)** **There are 10 birds on a tree. 4 birds fly away. How many are left?** Options: A) 5 B) 6 ✔ C) 7 D) 8 **Correct Feedback:** ✔ Yes! 10 – 4 = 6. **Incorrect Feedback:** ✘ Try again. Take away 4 from 10. --- # ✅ **Question 6 (Concept Understanding)** **Which action means addition?** Options: A) Taking away B) Putting together ✔ C) Breaking apart D) None **Correct Feedback:** ✔ Correct! Addition is putting things together. **Incorrect Feedback:** ✘ Wrong. Addition means joining groups. --- # ✅ **Question 7 (Multiple Choice)** **Ali has 4 red balls and 4 blue balls. How many balls does he have?** Options: A) 6 B) 7 C) 8 ✔ D) 9 **Correct Feedback:** ✔ Excellent! 4 + 4 = 8. **Incorrect Feedback:** ✘ Try again. Add the two groups together. --- # ✅ **Question 8 (Reasoning – Subtraction)** **A box has 12 candies. You eat 3. Your friend eats 2. How many candies are left?** Options: A) 5 B) 7 ✔ C) 10 D) 6 **Correct Feedback:** ✔ Well done! 12 – 3 – 2 = 7. **Incorrect Feedback:** ✘ Try again. Remove 3, then remove 2. --- # ✅ **Question 9 (Find the Missing Number)** **? – 5 = 4** What number should replace **?** Options: A) 7 B) 8 C) 9 ✔ D) 10 **Correct Feedback:** ✔ Great thinking! 9 – 5 = 4. **Incorrect Feedback:** ✘ Try again. Add 5 + 4 to find the missing number. --- # ✅ **Question 10 (Equivalent Expressions)** **Which number sentence equals 7 + 2 ?** Options: A) 5 + 3 B) 6 + 2 C) 8 + 1 ✔ D) 4 + 4 **Correct Feedback:** ✔ Correct! 8 + 1 = 9, same as 7 + 2. **Incorrect Feedback:** ✘ Try again. Look for the one that equals