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Physics

Physics
Which colour is the complementary colour of yellow ?

Red
Green
Orange
Blue

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Physics
A single fixed pulley is used to draw water from a well because

Efficiency is 100%
Velocity ratio is low
Mechanical advantage is high
Force is applied in a convenient direction

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Physics
A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance

Varies with the increase of depth of the immersion of the iron piece
Will increase
Does not change
Will decrease

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Physics
The sharpness of a television image is termed as its

Colour
Clarity
Graphics
Resolution

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Physics
Relative humidity is expressed as

Kilograms
Grams
Ratio
Percentage

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Physics
A person does some work of 1,000 J in 2 s. His power will be ________

1000W
25W
50W
500W

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