Third Term Examination
Class : SSS 2
Subject : Physics
Name : _____________________________________
Duration : 2 1/2 Hours.
Section A : Objective Questions
Instruction : Read the question carefully and pick from the options lettered a – d.
1. The inability of the eye to focus near objects is known as ___________. (a) Long sight (b) Astigmatism (c) Presbyopia
2. Which of the following has the shortest length? (a) Infra-red Ray (b) Gamma Ray (c) Ultra – violet Ray (d) Radio wave
3. Which of the following media allows the transmission of sound wave through them?
I. Air II. Liquid III. Solid
(a) I Only (b) II only (c) III only (d) I, II and III
4. The inside of a vacuum flask is usually coated with silver to reduce heat lost by __________. (a) conduction (b) convection (c) radiation (d) evaporation
5. When a ray of light is incident normally on an air-glass interface, it angle of refraction is _________. (a) 0° (b) 45° (c) 60° (d) 90°
6. Which of the following is a string instrument? (a) flute. (b) trumpet (c) piano (d) drum
7. In a wave, the maximum displacement of particles from their equilibrium position is called __________. (a) Frequency (b) Period (c) Amplitude (d) wave velocity
8. Which of the following is not a property longitudinal waves? (a) Compression (b) Reflection (c) Polarization (d) Diffraction
9. The temperature at which the water present in the air sufficient to saturate it is called the ___________. (a) Ice point (b) Dew point (c) Boiling point (d) Saturation point
10. Which of the following instruments may be used to measure relative humidity? (a) Hydrometer (b) Barometer (c) Manometer (d) Hygrometer
11. Cloud formation is the direct result of _________. (a) Precipitation (b) Vaporization (c) Condensation (d) Sublimation
12. Longitudinal waves cannot be __________. (a) Diffracted (b) Polarized (c) Reflected (d) Superposed
13. An image which cannot be formed on a screen is said to be __________. (a) inverted (b) real (c) virtual (d) erect
14. Which of the following have the longest wave length? (a) Infra-Red Rays (b) X-rays (c) Gamma Rays (d) Ultraviolet rays
15. Which of the following have a percussion instrument? (a) Flute (b) Organ (c) Bell (d) Sonometer
16. In which of the following simple machines is the effort applied between the load and the fulcrum? (a) Scissors (b) Pliers (c) Wheel barrow (d) Sugar tongs
17. The image of a pin hole camera is always ________. (a) diminished (b) blurred (c) enlarged (d) inverted
18. An object is placed 36cm from a converging lens of focal length 24cm. If the real image which 4cm high is formed, calculate the height of the object. (a) 2.0cm (b) 4.0cm (c) 6.0cm (d) 8.0cm
19. Specific heat capacity 36.4JKg-¹K-¹ of a body mean that when 36.4J of heat energy is supplied to a body of _________________. (a) mass 100Kg, the temperature rises by 1K (b) mass 1Kg, the temperature by 1000K (c) mass 1Kg, the temperature rises by 1K (d) mass 100Kg, the temperature rises by 1000K
20. Dew point is not affected by ____________. (a) temperature (b) atmospheric pressure (c) wind (d) the amount of water vapor in the atmosphere
21. A certain wave has a speed of 20ms-¹. If the frequency of the wave is 0.25Hz, calculate the distance between successive crests of the wave. (a) 5.0m (b) 40.0m (c) 50.0m (d) 80.0m
22. The property of a body remains at rest or to continue in uniform motion in a straight line is called _______ (a) Momentum (b) Energy (c) Impulse (d) Inertia
23. The ice point of the absolute scale of temperature is __________. (a) 0K (b) 32K (c) 100K (d) 273K
24. The pitch of a note is not affected by ___________. (a) frequency (b) tension in a vibrating string (c) mass of a vibrating string (d) amplitude of sound wave
25. A wire of length 400cm is stretched between two fixed points. When plucked, it’s fundamental frequency is 159Hz. Calculate the speed of the wave produced. (a) 250ms-¹ (b) 625ms-¹ (c) 1200ms-¹ (d) 1500ms-¹
26. The Bob of a simple pendulum takes 8.0s to complete 10 oscillations. Determine the frequency of oscillation of the Bob. (a) 0.125Hz (b) 1.25Hz (c) 7.50Hz (d) 8.00Hz
27. Frequency is measured in _________. (a) Metre per seconds (b) seconds (c) Hertz (d) Farad
28. To obtain a virtual, erect and magnified image from a thin converging lens, an object must be placed (a) between the focus and the lens (b) at the focus (c) between the focal length and the lens (d) on the lens
29. The movement of fluid up or down a narrow tube is _________. (a) Osmosis (b) Brownian motion (c) Capillary (d) Difussion
30. An object is placed 10cm from a converging lens of focal length 15cm. Calculate the magnification of the image formed. (a) 3.0 (b) 1.5 (c) 0.6 (d) 0.3
31. The sound heard by a person after the reflection of the sound generated by him is called ___________. (a) reverberation (b) echo (c) resonance (d) audibility
32. The quality of a note depends on its __________. (a) frequency (b) pitch (c) overtones (d) amplitude
33. An object placed in front of a concave mirror whose radius of curvature is 12cm. If the magnification of the image produced is 1.5, how far is the object from the mirror? (a) 8cm (b) 10cm (c) 18cm (d) 20cm
34. 491K is equivalent to ________. (a) 273°C (b) 218°C (c) 491°C (d) 764°C
35. The following are derived units Except __________. (a) Kgm-³ (b) N (c) m³ (d) Kg
36. 12V battery supplies a current of 0.4A to a lamp. Calculate the resistance of the lamp. (a) 30.00 (b) 4.80 (c) 0.03 (d) 3.00
37. When a yellow card is viewed in blue light, it will appear (a) black (b) purple (c) red (e) white
38. A lens that is thinner at the middle and thicker at the edges is _________. (a) diverging (b) converging (c) Plano-convex (d) meniscus
39. Consider the wave equation : y = 10sin (x – 50t), what does the number 10 represent? (a) Acceleration (b) Speed (c) Amplitude (d) Wave length
40. The inverse of time required for a wave to complete one full cycle is called _________. (a) wavelength (b) period (c) frequency (d) amplitude
Section B: Theory
Answer any four (4) questions in this section.
1a.) State three characteristics of sound and the factor on which each of them depends.
b.) Explain resonance as applied to sound.
c.) What role does echo play in the construction of a concert hall?
d.) A sound wave of velocity 350ms-¹ is directed towards the surface of water. If the ratio of the wavelength of sound in water to that in air is 425 : 100, calculate the velocity of the wave in water.
2a.) A student in a lecture theater can read from the board clearly but requires a pair of spectacles to read from a book.
i.) What eye defect has this student?
ii.) What type of lens is needed to correct the eye defect?
iii.) The focal length of the lens used to correct this defect is 10cm. Calculate the power of the lens.
b.) The image of an object is located 9cm behind a convex mirror. If magnification produced is 0.6, calculate the focal length of the mirror.
c.) If tension is maintained on a stretched string of length 0.6m. Such that its fundamental frequency of 220Hz is excited, determine the velocity of the transverse wave in the string.
3a. Explain what is meant by the pure spectrum of light. Draw a labelled ray diagram showing the arrangement of the apparatus necessary to obtain a pure spectrum of white light.
Write down the function of each apparatus.
bi.) Why does grass appear green and
ii.) Red glass appear red when looked in the sunlight.
c.) A man standing 519m away from a wall sound a whistle. The echo from a wall reaches him 3s later. Calculate the velocity of sound in air.
d.) Distinguish between a real and a virtual image.
4a.) Define Stable equilibrium as applied to a rigid body.
b.) Sketch a block and tackle system of pulleys with a velocity ratio of 3.
c.) Find the frequencies of the first three harmonic of a piano string of length 1.5m. If the velocity of the waves in the string is 120m/s.
d.) A meter rule is found to balance horizontally at the 48cm mark, the balance point is found to be at the 30cm mark. Calculate the mass of the meter rule.
5a.) Explain refraction of a wave
b.) State two conditions necessary for :
i.) total internal reflection of a wave to occur.
ii.) Interference wave patterns to be formed.
c.) The distance between two successive crests of a water wave traveling at 3.6ms-¹ is 0.45m, calculate the frequency of the wave.
d.) A ray of light is incident at an angle 30° at an air-glass interface.
i.) Draw a ray diagram to show the deviation of the ray in the glass.
ii.) Determine the angle of deviation of a ray of light which is incident at angle of 30 degrees at an air to glass interface. (Refractive index of glass = 1.50)
6a.) Explain the function of the following and their functions in a camera.
i. Shutter. ii. Lens iii. Aperture and
iv. Photographic film.
b.) What are wind instrument? State four (4) different types of wind instruments
c.) Find the focal length of the lens required to correct the defect of a vision of a man whose near point is 50cm. Assume the least distance of vision of the normal eye to be 25cm.
d.) Define the following terms:
i.) Principal focus
ii.) Focal length of a converging lens.