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- Question
Two concave lenses of 60 cm focal length are cemented on either side of a convex lens of 15 cm focal length. The focal length of the combination is
Options- A. 10 cm
- B. 20 cm
- C. 30 cm
- D. 40 cm
- Correct Answer
- 30 cm
- 1. If H and d are the water depth and drop in the bed level at a Sarda fall, the width B of the trapezoidal crest, is given by
Options- A. B = 0.22 H + d
- B. B = 0.33 H + d
- C. B = 0.44 H + d
- D. B = 0.55 H + d Discuss
- 2. In a three hinged arch, the bending moment will be zero
Options- A. at right hinge only
- B. at left hinge only
- C. at both right and left hinges
- D. at all the three hinges. Discuss
- 3. It ? is the probable error of an observed bearing of a line of length l, the error over the whole length of the traverse of n lines of length l is
Options- A. l n
- B.
n - C. ?
- D.
? n
Discuss
- 4. For the most economical trapezoidal open channel,
Options- A. half of the top width must be equal to one of the sloping sides
- B. the hydraulic mean depth must be equal to half the depth of flow
- C. the semicircle drawn with top width as diameter must touch the three sides of the channel
- D. All of these. Discuss
- 5. Setting out of Lemniscate transition curves, is done with
Options- A. perpendicular offsets
- B. radial offsets
- C. deflection angles
- D. polar deflection angles. Discuss
- 6. A construction schedule is prepared after collecting
Options- A. number of operations
- B. output of labour
- C. output of machinery
- D. quantity of various items
- E. all the above. Discuss
- 7. Which one of the following statements is true?
Options- A. The value of kinetic energy correction factor for turbulent flow lies between 1.03 to 1.06
- B. The value of kinetic energy correction factor for laminar flow is 2
- C. The practical value of kinetic energy correction factor for turbulent flow is unity
- D. all the above. Discuss
- 8. The rotational velocity of a satellite is increased by 450 m per second if its launch is done from equator
Options- A. eastward
- B. northward
- C. westward
- D. southward
- E. upward. Discuss
- 9. If the length of a transition curve to be introduced between a straight and a circular curve of radius 500 m is 90 m, the maximum perpendicular offset for the transition curve, is
Options- A. 0.70 m
- B. 1.70 m
- C. 2.70 m
- D. 3.70 m
- E. 4.70 m Discuss
- 10. The ratio of the inertia and viscous forces acting in any flow, ignoring other forces, is called
Options- A. Euler number
- B. Frode number
- C. Reynold number
- D. Weber number. Discuss
More questions
Correct Answer: B = 0.55 H + d
Correct Answer: at all the three hinges.
Correct Answer: l n
Correct Answer: All of these.
Correct Answer: polar deflection angles.
Correct Answer: all the above.
Correct Answer: all the above.
Correct Answer: eastward
Correct Answer: 2.70 m
Correct Answer: Reynold number
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