63.
According to Napier's Rules of circular parts for a right angled triangle, sine of middle part equals the product of

64.
Pick up the incorrect statement from the following:

65.
Pick up the correct statement from the following:

67.
While making astronomical observations, the observer is mainly concerned with

68.
If v, t and $$\frac{{\text{f}}}{{\text{H}}}$$ are the ground speed of the aircraft, the shutter speed of the camera and the scale of the photograph respectively, then the amount of image displacement

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