Related Questions

The scale of a tilted photograph of focal length f, taken from an altitude H, along the plate parallel through plumb point, is
A $$\frac{{\text{f}}}{{{\text{H}}\sec \theta }}$$
B $$\frac{{{\text{f}}\sec \theta }}{{\text{H}}}$$
C $$\frac{{\text{f}}}{{\text{H}}}$$
D $$\frac{{\text{f}}}{{{\text{H}}\cos \frac{1}{2}\theta }}$$
The scale of a tilted photograph of focal length f taken from an altitude H, along the plate parallel through principal point is
A $$\frac{{\text{f}}}{{{\text{H}}\sec \theta }}$$
B $$\frac{{{\text{f}}\sec \theta }}{{\text{H}}}$$
C $$\frac{{\text{f}}}{{\text{H}}}$$
D $$\frac{{\text{f}}}{{{\text{H}}\cos \frac{1}{2}\theta }}$$
‘H’ is the flying height above mean ground level and ‘f’ is the principal distance of a vertical photograph. The mean scale of the photographs is
A H × f
B $$\frac{{\text{H}}}{{\text{f}}}$$
C $$\frac{{\text{f}}}{{\text{H}}}$$
D H + f
একটি ধাতব তলে λ তরঙ্গদৈর্ঘ্যের একবর্ণী আলোকরশ্মি আপতিত হলে ফটো-ইলেক্ট্রন নির্গত হয় এবং এক্ষেত্রে বিভবের মান 3Vo একই তলে যখন 2λতরঙ্গদৈর্ঘ্যের একবর্ণী আলো আপতিত হয়, তখন নিবৃত্তি বিভবের মান Vol ফটো-ইলেক্ট্রন নির্গত হওয়ার জন্য ঐ তলটির সূচন তরঙ্গদৈর্ঘ্যের মান নির্ণয় কর।(A monochromatic light of wavelength λ is incident on a metallic surface then ejects photo-electron and the value of stopping potential is 3Vo. When the same surface is illuminated by a light of wavelength 2λ., the stopping potential becomes Vo. Calculate the threshold wavelength for this surface to eject photo electrons.)
A 6λ
B 8λ
C 4λ3
D λ
E 4λ
Plane P take off at 2:00 am and flies at a constants speed of Xmph. Plane Q takes off at 3:30 am and flies the same forte as plane p but travels at a constant X, how many hours after 3:30 am will plane Q overtake plan P?
A 1.5x/y +0.5
B 2
C 4
D 5
The point where vertical line passing through the perspective centre intersects the plane of the photograph, is known as
A Photo plumb point
B Plumb point
C Nadir point
D Isocenter
A circular frame with a width of 2 inches surrounds a circular photo with a diameter of 8/ inches Assuring that the area of the frame does not overlap the area of the photo what is the area of the frame?
A 8 pie
B 20pie
C 25pie
D 11 pie
A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in
A Light intensity
B Current
C Flux density
D Voltage
A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)
A P = W tanα
B P = W tan (α + φ)
C P = W (sinα + μcosα)
D P = W (cosα + μsinα)
The scale of a vertical photograph of focal length ‘f’ taken from height of ‘H’ metres above M.S.L., at a point of reduced level ‘h’, is
A $$\frac{{\text{f}}}{{\text{H}}}$$
B $$\frac{{\text{f}}}{{{\text{H}} + {\text{h}}}}$$
C $$\frac{{\text{f}}}{{{\text{H}} - {\text{h}}}}$$
D $$\frac{{{\text{H}} - {\text{h}}}}{{\text{f}}}$$

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