Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
A person standing waist-deep in a swimming pool appears to have short legs because of light?
diffraction
refraction
reflection
interference
Correct answer is B
The refractive index of water is greater than that of air.
So, A person legs appear to be short while standing in the tank due to refraction.
The secondary pigments consist of?
blue, green, and violet
yellow, green, and magenta
magenta, yellow, and cyan
red, green, and blue
Correct answer is C
The primary colors of pigment are red, blue, and green.
Mixing these primary colors of pigment gives us the three secondary colors:
red+blue=magenta, red+ green = yellow, and blue + green = cyan
An isotope has an initial activity of 120 Bq. 6 days later its activity is 15 Bq. The half-life is?
3 days
2 days
1 day
4 days
Correct answer is B
The equation that establishes a relationship between the amount left undecayed,
A, the initial amount, A0, and the number of half-lives that pass in a period of time t looks like this:
12n∗A0=A
12n∗120=15
12n = 15120
12n = 18
12n = 123
2n=23
n = 3
:6days ÷ 3 = 2days
Which of the following liquid is a poor conductor of electricity?
Distilled water
Tap water
Sea water
Drinking water
Correct answer is A
Distilled water is free of salts and is a poor conductor of electricity.