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

MECHANICAL ADVANTAGE , VELOCITY RATIO

Which is always constant for a machine of given design: MA or VR ? Ans: VR remains constant for a machine of given design as it depends on the distances moved by the load and effort but MA can vary due to the friction developed between the moving parts of the machine.

What is Regelation?

The melting point of ice is 0°C at normal pressure but when you increase the pressure on ice it melts at the temperature below 0°C( i.e. melting point of ice decreases with pressure). When the pressure applied is released then water formed from ice starts freezing. This phenomenon is called REGELATION.

ECHO IN LIVING ROOM

Why is echo not heard in our living rooms? To hear echo, the minimum distance between the source and the reflector must be 17m. When this distance is more than 17m, the reflected sound can be distinguished from the original. As the length of our rooms is less than 17m, we don't hear echo.

PHYSICS

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