Related Questions

Find the power of a convex lens if the image formed is at a distance of 25 cm from the lens when the object is placed on the other side of the lens at 12 cm from the optical centre?
A -4.33 diopters
B 12.33 diopters
C -12.33 diopters
D 4.33 diopters
একটি দ্বি-উত্তল অভিসারি লেন্সের প্রত্যেক পৃষ্ঠের বক্রতার ব্যাসার্ধ 30cm এবং গ্লাসের প্রতিসরাঙ্ক 1.50। লেন্সটির ফোকাস দৈর্ঘ্য কত হবে? (The radius of curvatures of both surfaces of a double convex lens are 30cm each and refractive index of glass is 1.50. What will be focal length of the lens?)
A 15 cm
B 30 cm
C 45 cm
D 60 cm
Which antenna is a wideband antenna?
A Hertz antenna
B Marconi antenna
C Folded dipole
D None of the above
A Yagi antenna has a driven antenna
A Only
B With a reflector
C With one or more directors
D With a reflector and one or more directors
A thin layer of dirt and grime coverts the reflecting surface of the parabolic dish of a radar set. The particular effect on the performance of the radar will be
A A decrease in range
B A reduction in horizontal resolution
C No noticeable effect
D A decrease in gain
If the maximum dip of a parabolic tendon carrying tension P is h and the effective length of the pre-stressed beam is L, the upward uniform pressure will be
A $$\frac{{8{\text{hP}}}}{l}$$
B $$\frac{{8{\text{hP}}}}{{{l^2}}}$$
C $$\frac{{8{\text{h}}l}}{{\text{P}}}$$
D $$\frac{{8{\text{h}}l}}{{{{\text{P}}^2}}}$$
For a symmetrical two hinged parabolic arch, if one of the supports settles horizontally, then the horizontal thrust
A Is increased
B Is decreased
C Remains unchanged
D Becomes zero
For a single point load W moving on a symmetrical three hinged parabolic arch of span L, the maximum sagging moment occurs at a distance x from ends. The value of x is
A 0.211 L
B 0.25 L
C 0.234 L
D 0.5 L
When the shear force diagram is a parabolic curve between two points, it indicates that there is a
A Point load at the two points
B No loading between the two points
C Uniformly distributed load between the two points
D Uniformly varying load between the two points
A ball which is thrown upwards, returns to the ground describing a parabolic path during its flight
A Vertical component of velocity remains constant
B Horizontal component of velocity remains constant
C Speed of the ball remains constant
D Kinetic energy of the ball remains constant

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