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1951.	The maximum speed of vibrations which produces audible sound will be in ………………
Answer» seawater ROUND GLASS dry air HUMAN blood ANSWER :A

1952.	Think of situation when the object is not displaced in spite of a force actingon it.
Answer» Solution :We apply FORCE to push a STEAM ENGINE. We get completely tired, but the engine does not move. In this case we have not done any WORK.

1953.	Which of the following situations involves the Newton'ssecond law of motion ?
Answer» ANSWER :B

1954.	An echo is heard after 0.8s, when a boy fires a cracker, 132m away from a tall building. Calculate the speed of sound?
Answer» SOLUTION :ECHO time `(t) = 0.8 s` TOTAL distance travelled by sound wave `2d=2xx132 m = 264 m` From, speed of sound `V=2d//t` `V=264 m//0.8s=330 m//s`

1955.	Express 15 m s^(-1)in km h^(-1) .
Answer» SOLUTION :NA

1956.	Which one of the following is most likely not a case of uniform circular motion ?
Answer» MOTION of the earth around the sun motion of a TOY train on a circular track motion of a racing car on a circular track motion of HOUR' HAND on the dial of a clock Answer :C

1957.	A car-engine of mass 150 kg spends 500 W power for 1 kg mass. How much force should be applied by the engine to run the car at uniform speed 20ms^(-1)?
Answer» SOLUTION :Total power =`150xx500` `=7.5xx10^(4)W` Force = `("Power")/("Speed")` `=(7.5xx10^(4))/(20)=3.75xx10^(3)N`

1958.	Fill in the blanks :- If a candle is burnt the chemical energy is transformed into …………..
Answer» SOLUTION :LIGHT ENERGY

1959.	Water stored in a dam possesses :
Answer» no ENERGY electrical energy kinetic energy POTENTIAL energy Solution :Water stored in a DAM is at a height (h) from the GROUND level and its potential energy is given by, PE= mgh.

1960.	Distinguish Between Work and Power
Answer» SOLUTION :

1961.	On mixing thecolours yellow and cyan, the colour obtained is __________ .
Answer» RED blue green black Solution :When the COLOURS red and green are mixed , we get the colour yellow. R + G = yellow(1) Also, when blue and green are mixed we get the colour cyan. Blue + Green = Cyan(2) ADDING eqn (1) and (2) Yellow + cyan = (R+G+B) + G = W + G = G Hence, bymixing yellow and cyan, we get thecolour green.

1962.	What is the momentum of 6.0 kg ball bowling with a velocity of 2.2 m//s ?
Answer» SOLUTION :`13.2 KG m//s^(2) (AS _(1))`

1963.	Cameras used in remote sensing make use of
Answer» VISIBLE light ultraviolet rediation redio WAVES INFRARED radiation Solution :Remote sensingcameras USE infrared rediation.

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