PHYSICS
PAPER TWO
SECTION A 25 MARKS
 An object O is placed between two mirrors P and R which are at 60o to each other as shown in the diagram below
Determine the number of images formed (2mks)  State one use of a charged gold leaf electroscope (1mk)

 Differentiate between polarization and local action in a simple cell (2mks)
 State the use of manganese (iv) oxide in a dry cell (1mk)
 On the figure below draw magnetic field lines between the poles (1mk)
 The figure below shows a soft iron bar AB placed in a coil near a freely suspended magnet
Explain the observation made when the switch is closed (2mks)  A girl standing in front of a cliff blows a whistle and hears the echo after 0.5 second. She then moves 17 metres further away from the cliff and blows the whistle again. She now hears the echo after 0.6 seconds. Determine the speed of sound (3mks)
 Copy and complete the ray diagram to locate the position of the image for the object placed at O in front of a convex mirror (3mks)
 Determine the critical angle of a medium of refractive index 1.65 (2mks)

 Define the term electromagnetic spectrum (lmk)
 Name one detector of infrared radiation (lmk)
 The diagram below shows plane waves moving from shallow to deep end of a pond
 Complete the diagram to show the waves on the deep end (lmk)
 State what happens at the boundary to the frequency of the waves (lmk)
 The figure below shows a human eye with a certain defect
 Name the defect (lmk)
 State how the defect can be corrected (lmk)
 A bulb is rated 75w, 240v. What does this mean? (lmk)
 Draw electric field pattern on the following isolated charge
SECTION B 55 MARKS
Answer all questions in this section

 Describe how the focal length of a convex lens can be determined using a screen and a metre rule (3mks)
 An object is placed 8cm from a diverging lens whose radius of curvature is 20cm. Determine the position of the image (3mks)
 An object of height 10cm is placed 30cm from a concave mirror of focal length 18cm.
 On the grid provided draw a ray diagram to locate the position of the image formed (3mks)
 From the diagram in part c (i) determine the
 image height (2mks)
 Image distance (2mks)

 The figure below shows a pair of parallel plates of a capacitor connected to a battery. The upper plate is displaced to the left.
State with reason the effect of this movement to the capacitance (2mks)  the figure below shows an electric circuit with three capacitors A,B and C of capacitance 4.0µf, 5.0µf and 3.0µf respectively connected to a 12v battery
Determine The combined capacitance of the three capacitors (3mks)
 The charge of the capacitor A (2mks)
 The potential difference across the capacitor B (2mks)
 The figure below shows a pair of parallel plates of a capacitor connected to a battery. The upper plate is displaced to the left.

 Define Ohm’s law (lmk)
 State two factors affecting the resistance of a conductor (2mks)
 Calculate the length of a wire required to make a resistor of 0.5Ω if the resistivity of the material is 4.9 x 10^{7} Ωm and cross –sectional area is 2.0 x 10^{6}m^{2} (3mks)
 Study the circuit diagram below and answer the questions
 What is the total resistance in the circuit (2mks)
 Determine the total current in the circuit (2mks)
 Find the voltage across the 10Ω resistor (2mks)

 Define critical angle (lmk)
 State one condition for total internal reflection (lmk)
 A ray of light travels from air through a multiple of transparent media m1, m2 and m3 with boundaries that are parallel to each other.
The refractive index of medium 1 is 1.4 and angles are shown on the diagram.
Calculate the following Angle θ1 (3mks)
 Refractive index of m_{2} (3mks)
 Speed of light in m_{1} given speed of light in air is 3.0 x 10^{8} m/s. (2mks)

 Define period (lmk)
 The figure below shows waves in a spring travelling along it from one end
 Determine
 Wavelength of the wave (lmk)
 Amplitude of the wave (lmk)
 If the velocity of the wave is 3.2m/s determine the
 Frequency of the wave (3mks)
 Period of the wave (2mks)
 Determine
 Waves in a ripple tank are incident on slits as shown below, complete the diagram to show the diffracted waves (2mks)
MARKING SCHEME
 No. of images = 360  1
θ
360  1 = 5 images
θ 
 Used to test insulation properties
 Used to test sign of charges (Any one)

 Polarization a production of hydrogen gas around the copper plate (positive plate) Local action is presence of impurities in the zinc plate .
 Acts as a depolariser or oxidizing agent

 Repulsion like pole repel and end B attains north pole (Accept n on the diagram if explanation is not there)
 V= ^{2s}/_{t}
^{2 x 17}/_{0.1} = 340m/s 
 = 1/’sin c sin c = 1/1.65
C=37.31º 
 Arrangement of electromagnetic waves in order of increasing or decreasing wavelength or frequency

 Skin
 Blackened bulb thermometer


 Frequency remains constant


 longsightedness
 Use of converging lens
 The bulb gives out energy at a rate of 75J per second when operated at 240v



 Using a lens focus on distance object into the screen
 Adjust the distance between the lens and screen to obtain a sharp image
 Measure the distance between the screen and the lens using a metre rule – this is the focal length of the lens
 u= 8cm
r= 20
f = 10cm
r= ?
1/f = 1/r + 1/u
^{1}/_{10} = ^{1}/_{v} + ^{1}/_{8}
^{1}/_{v} = ^{1}/_{10}  ^{1}/_{8}
^{1}/_{v} = ^{4  5}/_{40} = ^{9}/_{40}
v=4.44cm 


 HI = 3x 5 = 15cm + 2cm
 R= 14.8 x3 = 44.4cm + 0.5cm



 Capacitance decreases due to decrease in area of overlap

 5+ 3 = 8µf
C₁ = C₁ C₂ = 8 x 4 = 32 = 2.667µf
C₁ +C₂ 8+4 12  Q= CV 2.667 x 12 = 32.004µc
 V= 4/c = ^{32.000}/_{4} = 8.001v
128.001 = 3.999v
 5+ 3 = 8µf

 the current flowing through a conductor is directly proportional to potential difference provided temperature and other physical condition are kept constant

 Temperature
 Cross sectional area
 Length of conductor (Any two)
 L= RA/e
L= 0.5 x 2.0 x10¯⁶
4.9 x 10 ^{7}L= 2.0408M 
 20 x 30 = 600 = 12µ
C_{T} = C₁ + C₂ = 12 +10 = 22µ  V= IR I = V/R = ^{2.1}/_{22} = 0.095A
 0.095 x 10 = 0.95
 20 x 30 = 600 = 12µ

 Angle of incidence is denser medium of which angle of refraction is less dense medium is 90o.


 Ray must be from denser medium to less dense medium.
 Angle of incidence is denser medium must be greater than critical angle
 ∫ sin i
Sin r
1.4 = sinθ1 sinθ1= 1.4sin 38.2
sin 38.2
θ= 59.97º
∫= 2.67  ∫= C/V
1.4 = 3.0 x 10^{8}
V
V= 3.0 x 10^{8} = 2.143 x 10^{8}m/s.


 Time taken to complete one oscillation


 40cm or 0.4m
 4cm

 V= f/π = ^{3.2}/_{0.4} = 8Hz
 T = 1/f = 1/8 = 0.125 second


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