Name: ______Class: ______Date: ______
Instructions: Write answers in the right-hand column.Score: ______/ 100 marks
Section A—Multiple choice (20 marks) 1 mark Each
1 / Which ray below is the one that is reflected from a plane mirror?/ B / 1
2 / Perspex has a higher refractive index (density) than air. Light entering air from
perspex will:
Aslow down slightly and be bent towards the normal
Bslow down slightly and be bent away from the normal
Cspeed up slightly and be bent towards the normal
Dspeed up slightly and be bent away from the normal / D / 1
3 / Light travels with a speed at about
A. 300,000 meters per secondB. 3,000,000 meters per second
C. 30,000 kilometres per secondD. 300,000 kilometres per second / D / 1
4 / Which of the Electromagnetic radiation (EMR) has the highest frequency?
A infrared lightB radio waves
C X-raysD microwaves / C / 1
5 / Which of the following waves does not belong to electromagnetic radiation?
A infrared lightB white light
C X-raysD sound waves / D / 1
6 / When a pencil is viewed through water, it appears bent because light:
Aslows down as it passes from water to air
Bis reflected at the surface of the water
Cis refracted away from the normal as it passes from water to air
Dis refracted towards the normal as it passes from water to air / C / 1
7 / What is the meaning of the formation of a REAL image?
A You can see the image of an object
B The image has the same size as the object
C The image can be focused on a screen
D The image that is formed by a plain mirror / C / 1
8 / The image produced by a convex lens when the object is inside the focal length:
Aenlarged and uprightBdiminished and inverted
Cdiminished and uprightDenlarged and inverted / A / 1
9 / Which of the following(s) can form an image on a screen?
A plane mirror B concave mirror
C a transparent glassD convex mirror / B / 1
10 / Which of the radiation is involved in scanning luggage at the airport?
AX-raysBmicrowavesCgamma raysDblue light / A / 1
11 / What colour will a green leaf placed in green light appear to be?
AblackBgreenCredDblue / B / 1
12 / The image produced on the back of our eyes (retina) is:
Avirtual, upright and enlargedBvirtual, inverted and diminished
Creal, upright and enlargedDreal, inverted and diminished / D / 1
13 / What colour is transmitted when cyan light is shone on a green filter?
AcyanBblueCgreenDred / C / 1
14 / Which colours are absorbed by blue paint?
Ablue onlyB red, orange and yellow
Cgreen, blue, indigo and violetD red only / B / 1
15 / In the eye disorder known as long-sightedness, the image of an object forms behind the retina. Long-sightedness is corrected by bringing the image
forward using:
Aconvex lenses that bend the light less
Bconvex lenses that bend the light more
Cconcave lenses that bend the light less
Dconcave lenses that bend the light more / B / 1
16 / Which is the correct image formed by the plain mirror?
/ C / 1
17 / In a primary rainbow, what colour is at the top of the rainbow?
AblueBgreenCorangeDred / D / 1
18 / Comparing microwaves and ultraviolet rays,
Amicrowaves have lower frequencies
B ultraviolet rays have longer wavelengths
C microwaves have more energy than ultraviolet rays
D ultraviolet rays are more visible than microwaves / A / 1
19 / Which of the following colours of light is most strongly refracted?
AredByellowCgreenDviolet / D / 1
20 / Three primary colours of light which mix to make white light, they are:
Ayellow, green, redBcyan, yellow, magenta
Cgreen, blue, redDred, green, orange / C / 1
Section B—Written answers (60 marks)
1 / If a light ray strikes a mirror at an angle of 30o to the mirror, what is:athe angle of incidence?
bthe angle of reflection? / a60o
b60o / 2
2 / What is meant by the refraction of light? / The bending of a light ray as it passes from one substance into another substance (different media) / 2
3 / The diagram on the right shows a light ray travelling through air to the interface between the air and a glass block.
On the diagram, draw the normal, and a possible path for the ray in the glass.
Label on the diagram: normal, angle of incidence, angle of refraction, refracted ray, incident ray /
/ 4
4 / Which type of lens (convex or concave):
ais fatter in the middle than at the ends?
bcan produce a real image? / a convex
b convex / 3
5 / Curved mirrors are usually shown in
cross-sectional views to indicate their shapes. Three such shapes are shown below.
a Which mirror is which?
(parabolic, convex, concave )
bWhat happen when a spot light is placed in front of each of these mirrors?
cGive one use of each of these mirrors. / a Diagram I = convex mirror
Diagram II= parabolic mirror
Diagram III = concave mirror
bconvex mirror – light diverges out
parabolic mirror – light reflects in a parallel manner
concave mirror – light converges
c convex mirror – security mirror in shops
parabolic mirror – torch, headlight in cars
concave mirror – shaving mirror, dental mirror / 9
6 / You have two lenses. Lens A is fat and highly curved. Lens B is flatter, being only slightly curved. Which lens (A or B) can be expected to:
abend light the most?
bhave the longest focal length? / aLens A
bLens B / 2
7 / What is the name given to the:
a splitting of light into component colours by a prism?
b Why do light split up into rainbow colours?
c List all the rainbow colours in the correct order. / aDispersion
bWhite light consists of different colours and they travels at different speed and bend differently
cRed, Orange, Yellow, Green,
Blue, Indigo, Violet
/ 4
8 / Complete the following table on EMR.
Radiation / Special Feature / Uses
microwave / wavelengths ranging from 1 mm to 1 m / cooking
ultraviolet / just beyond the visible spectrum / sun tanning
radiowaves / longest wavelength and lowest frequency / telecommunication
gamma ray / shortest wavelength and the most powerful energy / cancer treatment
visible / only spectrum visible to human eye / photosynthesis
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9 / This question concerns colours of light.
aName the primary colours of light.
bWhy are they called primary colours?
cName the secondary colours of light.
dWhy are they called secondary colours?
eIs White a colour? / aRed, green and blue.
bThey can be combined in various proportions to form all the other colours.
cCyan, magenta and yellow.
dThey are produced when just two primary colours overlap.
eYes, white is a combination of rainbow colours.. / 5
10 / The diagram below shows combinations of light colours.
State the name of the colours seen
in a to d. / a cyan
bmagenta
cwhite
dyellow / 4
11 / What colour (if any) is transmitted when:
awhite light is shone on a
blue filter?
bred light is shone on a
green filter?
cmagenta light is shone on a
red filter? / ablue
bno light
cred / 3
12 / What colour or colours of light are:
aabsorbed by a blue shirt?
breflected by a red shirt?
ccombined to produce yellow light? / aall colours other than blue
bred
cred and green / 3
13 / aWhat are the three ‘primary colours of pigments’?
bGive an example of secondary colour created by 2 primary colours. / acyan, magenta and yellow
be.g blue+yellow = green
blue+red = purple
red+yellow = orange / 2
14 / a People having short-sightedness is due to the fact that the eyeball is longer than the normal.
b The image of the far object is formed in front of the retina.
c Complete the diagrams to illustrate the problem.
d What lens can be used to correct this problem? Convex lens – it diverges the light further and reaches the retina – giving sharp focus of image.
/ 8