REVISION QUESTIONS CLASS 10

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