PHYSICS REVISION TEST
CLASS 10 , MACHINESS AND REFRACTION OF LIGHT
ATTEMPT ALL QUESTIONS.
Q1. Give two reasons for a single movable pulley not to be 100% efficient. 2
Q2. What is the purpose of a Jack in lifting a car by it ? 2
Q3. Stars twinkle in the sky . Give reason. 2
Q4. Draw a labelled diagram of a block and tackle system with velocity ratio 5. 2
Q5 Name the single pulley with mechanical advantage more than one. State its one disadvantage.2
Q6. State two laws of refraction 2
Q7 State two factors affecting refractive index of a medium. State the effect also.2
Q8. Which colour out of green and orange , is deviated the most. Give reason for your answer. 2
Q9. A water pond appears 1.35 m deep. If the refractive index of water is 4/3, find the actual depth of the pond. 2
Q10. What is total INTERNAL reflection? 2
Q11.Draw a diagram for the deviation of a light ray by 90°. 2
Q12 Which colour of the visible light has maximum critical angle.? Why? 2
Q13Explain the cause for sparkling of a diamond. 2
Q14. Statr the principle of a simple machine. From which law is it derived? 2
Q15. State the principle of machines. 2