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80073251. The fourth stale of matter is known as
A
GasB
VapourC
PlasmaD
ElectronsCorrect Answer: C. Plasma
80150252. Why the needle of iron swims on the water surface when it is kept gently?
A
It will remain under the water when it will displace more water than its weightB
the density of the needle is less than that of waterC
due to surface tensionD
due to its shapeCorrect Answer: C. due to surface tension
80019253. An oil drop spreads over water because
A
oil is lighter than waterB
oil is more viscousC
oil does not mix with waterD
surf tension of oil is much smaller than that of waterCorrect Answer: D. surf tension of oil is much smaller than that of water
80078254. The instrument used to measure the speed of the wind is
A
AltimeterB
AnemometerC
ChronometerD
DosimeterCorrect Answer: B. Anemometer
80100255. We always see the same face of the moon, because
A
It is smaller than the earthB
it revolves on its axis in a direction opposite to that. of the earthC
it takes equal time for revo-lution around the earth and rotation on it.s own axisD
it rotates at the same speed as the earth around the sunCorrect Answer: C. it takes equal time for revo-lution around the earth and rotation on it.s own axis
80139256. Which one of the following ani-1 mals can hear the ultrasonic sound?
A
RatB
SquirrelC
CatD
BatCorrect Answer: D. Bat
80015257. A simple microscope consists of
A
a short focus convex lensB
a long-focus convex lensC
a short focus concave lensD
a long-focus concave lensCorrect Answer: A. a short focus convex lens
80069258. The electron microscope was invented by
A
Knoll and RuskaB
Robert KochC
LeeuwenhoekD
C.P. SwansonCorrect Answer: A. Knoll and Ruska
80066259. The device which converts AC to DC is
A
OscillatorB
AmplifierC
RectifierD
None of theseCorrect Answer: C. Rectifier
80030260. For which Diode is used?
A
modulationB
oscillationC
amplificationD
purificationCorrect Answer: D. purification
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