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
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called
A Thermal resistance
B Thermal coefficient
C Temperature gradient
D Thermal conductivity
If white is called black, black is called red, red is called yellow, yellow is called green, green is called blue, blue is called violet and violet is called orange, what would be the colour of human blood?
A green
B black
C red
D yellow
The price per unit of a product increases by 25% . The actual Taka increase in the unit price is Tk.1.25. What was the unit price in Taka before the price increase?
A 5
B 7.5
C 6.25
D 8.75
The price per unit of product increased by 25% The actual taka increase in the unit price was Tk. 1.25. What was the unit price in Taka, before the price increase?
A 5.00
B 6.25
C 7.50
D 8.75
The price per unit of product increased by 25% The actual taka increase in the unit price was Tk. 1.25. What was the unit price in Taka , before the price increase?
A 5.00
B 6.25
C 7.50
D 8.75
Based on the information below, how much did a certain telephone call cost? 1. The call lasted 1 minute 27 seconds 2. The cost for the first 30 second unit is Tk. 1.80, call duration more than 30 seconds costs Tk. 0.90 per 30 second unit 3. Any call duration less than 30 seconds is rounded up to the nearest 30-second unit.
A Tk. 1.80
B Tk. 2.61
C Tk. 2.70
D Tk. 3.51
If 'air' is called 'green', is called 'red', 'red' is called 'sea', is called 'blue', 'blue' is called 'water' and 'water' is called 'pink', then what is the color of grass?
A Green
B Air
C Red
D Pink
If Dust is called Air, Air is called Fire, Fire is called Water, Water is called Colour, Colour is called Rain and Rain is called Dust, where do Fish live ?
A Dust
B Fire
C Colour
D Water

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