Physics
The odometer guage indicates

The depth of the ocean
The distance travelled by a vehicle
Frequency of the wave
Pitch length

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Physics
Holography is a technique of

Recording a permanent three dimensional black and white photograph
Recording a permanent three dimensional multicolour photograph
Recording a permanent, sharp two diimensional black and white or multicolour photograph
Recording a permanent three dimensional photograph of a given single colour or a multicolour

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Absence of gravity outside
Acceleration in the orbit which is equal to the acceleration due to gravity outside
Fact that spacecraft in the orbit has no energy
Presence of gravity outside but not inside the spacecraft

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