Physics
Which combination of colour is the most convenient during day and night time ?

Yellow and blue
Red and green
White and black
Organe and blue

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Physics
A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?

The liquid surface falls down on the direction of motion and rises up on the back side of the tank
The surface of the liquid remains horizontal
The liquid surface falls down only at the center of the tank
None

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Physics
Solar eclipse will take place when

the sun is between the moon and the earth
the moon is between the sun and the earth
the moon does not lie on the line joining the sun and the earth
the earth is between the moon and the sun

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Air-gaps are necessary for bearing the weight of running train
Accidents due to expansion in summer can be avoided
Steel can be saved
Accidents due to contraction in winter can be avoided

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