1. What is the unit of work.....


Joules




2. A man will exact the greatest pressure on a bench when he lies flat on his back 




3. The working principle of a washing machine is...


centrifugation 




4. The base of an electric iron is brightly polished mainly.....


to reduce heat loss by radiation 




5. Ball bearings are used in cycles, scooters etc to




Reduce the friction between the wheel and the axle 




6. Total internal reflection can take place when light travels from 


Diamond to glass 




7. If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to _____ ? 


300 m 




8. The information of brilliant colors in a thin soap film is a consequence of the phenomena of 


Multiple reflection and interference 




9. Reading of a barometer going down is an indication of 


Rainfall 




10. One astronomical unit is the average distance between


Earth and the Sun 




11. The image of an object formed on the retina of the eye is


Real and inverted 




12. Energy is continuously generated in the sun due to


Nuclear fusion 




13. Which Color has the Longest Wavelength?


Red 




14. Erg cross Sec is the unit of 


Planck s constant 




15. photosynthesis takes place faster in white light 


Light from the sun reaches us in nearly...


8 min 




16. Blotting paper absorbs ink due to 


Capillary action phenomenon 


17. Which liquid is the most viscous 


Oil 




18. Formation of shadows can be explained by rectilinear propagation of light 




19. In a freezer ice cubes will be formed more quickly in trays made of...


aluminium 




20. The direction of heat flow between two objects depends on


Their temperatures 




21. The purpose of choke in tube light is


Induce high voltage



22. The direction of heat flow between two objects depends on


Their temperatures 




23. What is the full form of


Radio Detecting and Ranging 




24. Which of the following is a scalar quantity electric current 




25. The Capacity of a Communication Channel is Measured in.....


Band width 




26. Which of the following is the fastest communication channel? 


Microwave 




27. Which is the point from where an azimuth originates?


North 




28. When light enters from air to water, then its


frequency is same but wavelength is smaller in water than in air

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