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একটি ধাতুর ওপর সবুজ আলো আপতিত হলে ফটোইলেক্ট্রন নির্গত হয়। নিচের কোন বর্ণের আলো আপতিত হলে ঐ তল থেকে অবশ্যই ফটোইলেক্ট্রন নির্গত হবে? (A metal surface emits photoelectrons when illuminated by green light. Illumination with which of the following colour of light will definitely cause photoelectrons to be emitted from the surface?)
A লাল (Red)
B হলুদ (Yellow)
C নীল (Blue)
D কমলা (Orange)
The green light only ever goes on when tank A is full and tank C isn't empty. The red light is always on unless either tank A isn't Full or tank B is empty. Given that the green light is on, we can conclude all of the following EXCEPT---
A Tank A cannot be empty
B The red light must be on
C Tank C cannot be empty
D we don't have enough information to determine whether tank B is empty or not
The surface of a certain planet reflects 80 percent of the light that strikes it. The clouds around the planet then absorb 40 percent of the reflected light. What percent of the light that strikes the planet is reflected from the surface and passes through the clouds without being absorbed?
A 32%
B 40%
C 48%
D 60%
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
In raster-scan colour monitors, colour can be intensified by:
A grouping the phosphor dots in a circular pattern
B having each electron gun controlled by a composite signal
C using an in-line gun arrangement with a solid metal mesh
D having each electron gun controlled by separate signal
E None of the above
Which colour is the complementary colour of yellow ?
A Blue
B Green
C Orange
D Red
What is the real colour of the sun?
A Pure White
B Pure Orange
C Red
D Blue
A garment of which colour will be warmest in the sun?
A White
B Blue
C Black
D Yellow
The golden rays of the setting sun fall _____the water and tings them with goleden colour.
A of
B from
C in
D on
If there is no Sun, the colour of the sky would be ________
A Orange
B Blue
C Yellow
D Black

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