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.
12.0%
25.0%
33.3%
75.0%
Correct answer is D
Efficiency = \(\frac{IR}{I(R + r)}\) x 100
= \(\frac{6}{I(2 + 6)}\) x 100
= 75%
A spectrum of sunlight is said to be impure when
it is made of only three colours
it has no red colour in it
the different colours in it overlap
it does not contain white light
Correct answer is C
No explanation has been provided for this answer.
Which of the following statement is TRUE of ultraviolet, visible and infra-red rays?
they are all electromagnetic waves with the same wavelength
ultra-violet rays have shorter wavelengths than infra-red rays and produce flourescence
infrared rays have shorter wavelength than visible light and produce the sensation of heat
the wavelenghts increase in the sequence: visible, ultra-violet, infra-red
Correct answer is B
No explanation has been provided for this answer.
When white light is dispersed by a spectrometer, the component having the shortest wavelength is
orange
green
violet
red
Correct answer is C
No explanation has been provided for this answer.
i and ii only
ii and iii only
i and iii only
i, ii, and iii only
Correct answer is A
No explanation has been provided for this answer.