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
পাত-দূরত্ব d এবং ধারকত্ব C. এমন একটি সমান্তরাল পাত ধারকের পাত দুটির মাঝখানে d/2 পুরুত্ববিশিষ্ট একটি ধাতব পাত স্থাপন করা হলো। নতুন ধারকত্ব কত হবে? (A metal plate of thickness d/2 is inserted between the plates of a parallel plate capacitor with plate separation d and capacitance C. What is the new capacitance?)
A C/d
B C/2
C 4Cd
D 2c
For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as
A 2E
B 3E
C 4E
D 6E
Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a __________ surface.
A Plane
B Curved
C Ribbed
D Either A or B
A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.
A 45
B 60
C 80
D 95
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
If there is a circular hole in a metal plate, what happens to the radius of the hole when the plate is heated?
A Increases
B Decreases
C Unchanged
D Depends upon the metal
A train is travelling at 100 km per hour (Kmh) overtakes a motorbike travelling at a speed of 65 kmh in 40 seconds . What is the length of the train in meters?
A 400
B 450
C 500
D Try your self
A train travelling at 100 km per hour overtakes motorbike travelling at a speed of 65 km per hour in 40 seconds. What is the length of the train in meters
A 400 metrs
B 450 meters
C 500 meters
D 550 meters
Travelers checks are useful when one is travelling because --- people get advantage by using them during travelling.
A some
B few
C many
D much

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