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1951.

The maximum speed of vibrations which produces audible sound will be in ………………

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seawater
ROUND GLASS
dry air
HUMAN blood

ANSWER :A
Discussion
1952.

Think of situation when the object is not displaced in spite of a force actingon it.

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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.
Discussion
1953.

Which of the following situations involves the Newton'ssecond law of motion ?

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ANSWER :B
Discussion
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?

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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`
Discussion
1955.

Express 15 m s^(-1)in km h^(-1) .

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SOLUTION :NA
Discussion
1956.

Which one of the following is most likely not a case of uniform circular motion ?

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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
Discussion
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)?

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SOLUTION :Total power =`150xx500`
`=7.5xx10^(4)W`
Force = `("Power")/("Speed")`
`=(7.5xx10^(4))/(20)=3.75xx10^(3)N`
Discussion
1958.

Fill in the blanks :- If a candle is burnt the chemical energy is transformed into …………..

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SOLUTION :LIGHT ENERGY
Discussion
1959.

Water stored in a dam possesses :

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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.
Discussion
1960.

Distinguish Between Work and Power

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SOLUTION :
Discussion
1961.

On mixing thecolours yellow and cyan, the colour obtained is __________ .

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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.
Discussion
1962.

What is the momentum of 6.0 kg ball bowling with a velocity of 2.2 m//s ?

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SOLUTION :`13.2 KG m//s^(2) (AS _(1))`
Discussion
1963.

Cameras used in remote sensing make use of

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VISIBLE light
ultraviolet rediation
redio WAVES
INFRARED radiation

Solution :Remote sensingcameras USE infrared rediation.
Discussion