PROPAGATION OF LIGHT-1
1.
a.
b.
c.
d.
An annular eclipse occurs when the
earth comes between the moon and the sun.
penumbra area is greater than the umbra.
tip of the umbra fails to touch the earth.
umbra area is greater than the penumbra.
2.
a.
b.
c.
d.
An illuminated body is one which can be seen as a result of light it
reflects.
diffracts.
refracts.
diffuses.
3.
a.
b.
c.
d.
The following are illuminated bodies except
the sun.
a candle.
the moon.
a fluorescent body.
4.
a.
b.
c.
d.
In an annular eclipse of the sun,
the earth is between the sun and the moon.
the penumbra extends beyond the earth.
the observer on the earth does not see the sun at all.
the umbra does not fall on the earth.
5.
a.
b.
c.
d.
The characteristic of light that is demonstrated by the casting of sharp shadows is
reflection.
refraction.
Doppler effect.
rectilinear propagation.
6.
a.
b.
c.
d.
The image of an object formed by a pinhole camera
is always real, inverted and same size as the object.
is always virtual, inverted and smaller than the object.
shows that light energy is propagated in a straight line.
is unaffected by the size of the pinhole.
7. Which of the following phenomena is not a direct consequence of rectilinear
propagation of light?
a. Lunar and solar eclipses.
b. Images of object in a pinhole camera.
c. Diffraction of light.
d. Shadows of opaque objects.
8.
a.
b.
c.
d.
A piece of paper soiled with oil becomes
transparent.
opaque.
luminous
translucent
9.
a.
b.
c.
d.
The correct linear arrangement for an eclipse of the sun to occur is
sun-earth-moon
sun-moon-earth
earth-sun-moon
sun-star-moon
10. Which of the following statements about formation of shadows is correct?
a. Penumbra shadow is thicker than umbra.
b. An extended source of light produces on bright shadow.
c. A point source of light cannot produce shadow.
d. Umbra shadow is darker than penumbra.
11. The length of a pinhole camera is 20.0 cm. A mango tree, which is 5.0 cm high, is at a
distance of 10.0 cm from the pinhole. Determine the height of the image of the tree.
a. 2.0 cm
b. 2.5 cm
c. 5.0 cm
d. 10.0 cm
12. A narrow beam of light from a point source forms a shadow of an object on a screen. If
the source is replaced by a larger one, the shadow becomes
a. brightly only
b. blurred only
c. sharp only
d. bright and blurred.
13. The principle of operation of the pinhole camera and the formation of shadows and
eclipses are evidences that light
a. can be reflected.
b. can be refracted.
c. travels in a straight line.
d. can be transmitted.
14. Which of the following statements about annular eclipse is not correct? It occurs when
a. the moon is farther from the earth than in normal solar eclipse.
b. the umbra intersects before reaching the earth.
c. a ring of light is formed round the shadow of the moon.
d. the earth is between the sun and the moon.
15. The image formed in a pinhole camera is
I. inverted and real.
II. same size as the object.
III. diminished and inverted.
IV. larger as the camera is moved close to the object.
Which of the statements above are correct?
a. I, III and IV only
b. I, II and IV only
c. I and III only
d. II and III only
PROPAGATION OF LIGHT-2
1. a) Distinguish between an illuminated body and a luminous body.
b) i) Draw a labeled diagram of the eclipse of the sun by the moon showing positions of
total and partial eclipse on the earth.
ii) Draw and explain the appearance of the sun to observer in the penumbra of the earth.
2. With the aid of a labeled diagram, explain how annular eclipse of the sun occurs.
3. State two:
i)
Differences between a transparent medium and a translucent medium.
ii)
Examples of each of the media.
4. Explain why an image formed on the screen of a pinhole camera is inverted.
5. State why an observer cannot see around corners.
6. List three advantages of fluorescent tubes over filament bulbs.
7. Explain the term parallax as used in optics.
Wave motion-1
1. Which of the following is correct relationship between the velocity, v and the
frequency, f of a wave?
a. v ∝ f
1
b. v ∝ 𝑓
c. v ∝ f2
1
d. v ∝ 𝑓2
2. Which of the following statements is correct about a progressive wave?
a. The amplitudes of vibration of the particles are different.
b. No points on the wave are permanently at rest.
c. The energy of the wave is conserved.
d. Adjacent minimum and maximum points on the wave are in phase.
3. Which of the following takes place when waves from two close vibrating sources
combine in such a way that the crests of the waves from one source always arrive at
the same time as the crests of the waves from the other source?
a. Reflection of waves
b. Destructive interference
c. Wave diffraction
d. Constructive interference.
4. Which of the following statements about the electromagnetic spectrum are true?
I.
Radio waves are not included in the spectrum.
II.
The wavelength of x-rays is shorter than that of infra-red rays.
III. Television waves are part of the electromagnetic spectrum.
IV.
Gamma rays lie outside the electromagnetic spectrum.
a. I and II only
b. II and III only
c. II and IV only
d. III and IV only