| 1 |
A ray of white light strikes a rectangular glass block normally. How many rays of light and what colour, emerge form the block?
|
Impossible to say without knowing the composition of the polychromatic ray of light<br>
three rays of red, blue and green light respectively <br>
Seven rays of light<br>
One ray of with light <br>
|
| 2 |
What colour do you get when you add all of the additive colours together?
|
Black <br>
White <br>
Brown <br>
Grey <br>
|
| 3 |
A red tomato appears to be which colour under blue light?
|
Black <br>
Red <br>
Blue <br>
Purple <br>
|
| 4 |
Why does a green cucumber appear green?
|
It gives off green particles, which enter your eyes <br>
Green particles are attracted to it <br>
It absorbs only green, and all the other <br>
it absorbs all the colours except for green so you only see green <br>
|
| 5 |
What is light subtraction?
|
it is shutting out light beams to create a darkened void <br>
it is using the color spectrum to see if stars are moving away from earth <br>
it is the process of subtraction without borrowing from the next number grouping <br>
It is how things that do not give off light are colored <br>
|
| 6 |
What is light amplification by stimulate emission of radiation?
|
Solar energy <br>
A laser <br>
Plasma <br>
Cosmic rays <br>
|
| 7 |
A dental plate clings to the roof of the mouth because
|
force of cohesion increase <br>
force of cohesion decreases <br>
force of adhesion increases <br>
force of adhesion decreases <br>
|
| 8 |
An ice ball floats in to a water tank, when the ice melts, the water level
|
Rises <br>
Does not change <br>
falls down <br>
First increases then decreases<br>
|
| 9 |
A hot body will radiate heat most rapidly if its surface is
|
White and polished <br>
White and rough <br>
Black and polished <br>
Black and rough <br>
|
| 10 |
The ratio of the velocity of the body to the velocity of the sound is called
|
Magic number <br>
Replace number <br>
Natural number <br>
match number <br>
|
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