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Physics Paper 2

Total questions: 92

Worksheet time: 5hrs 36mins

Name
Class
Date
1.

State the laws of refraction

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2.

Show that the effective focal length for two thin lenses in contact is given by 1f1= 1f1+1f2−xf1f2\frac{1}{f_1}=\ \frac{1}{f_1}+\frac{1}{f_2}-\frac{x}{f_1f_2} where f1 and f2 are focal lengths of individual lenses

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3.

An equi-convex lens is placed on horizontal plane mirror and pin held vertically above the lens is found to coincide with it's image at 20cm above the lens. When few drops of the liquid are placed between the lens and mirror, the pin has to be raised 10cm to obtain coincidence with the image. If the refractive index of the convex lens is 1.5, find the refractive index of the liquid.

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4.

Describe an experiment to determine the refractive index of liquid using air cell.

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5.

Explain with aid of diagram why a thick plane mirror forms multiple image

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6.

Explain why glass prisms are preferred to plane mirrors in optical instruments.

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7.

A monochromatic light is incident at an angle of 450 on a glass prism of refracting angle 700 in air. The emergent light grazes the other refracting surface of the prism. Find the refractive index of the glass material.

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8.

What is angular magnification

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9.

Derive the expression for magnification of compound microscope in normal adjustment

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10.

Why should the objective and eye piece of compound microscope have short focal length?

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11.

Describe an experiment to determine focal length of a concave lens using concave mirror

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12.

An object is placed 20cm in front of a diverging lens placed coaxially with concave mirror of focal length 15cm. When the concave mirror is 20cm from the lens the final image is coincides with the object . Determine the focal length of diverging lens.

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13.

With the aid of diagram describe the essential parts of photographic camera.

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14.

State the laws of reflection

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15.

Describe an experiment to determine the focal length of a convex mirror using plane mirror

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16.

Give two applications of concave mirrors

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17.

Derive the expression 1f=1U+1V for convex mirror , where f ,V and U carry usual meaning.

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18.

Derive the expression for magnification of n astronomical telescope not in normal adjustment

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19.

Show that for a ray after two successive reflection between two inclined mirrors ,the total deviation is twice the angle between the mirrors

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20.

With aid of diagram describe the structure and operation of sextant

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21.

Define critical angle and absolute refractive index

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22.

Describe an experiment to determine the focal length of a convex mirror using convex lens

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23.

Give two applications of concave mirrors

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24.

Derive the expression 1f=1U+1V for concave mirror , where f ,V and U carry usual meaning, for finite object

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25.

Describe an experiment to determine angle of minimum deviation for a ray passing through prism.

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26.

Show that for a ray passing through a glass prism symmetrically n= sin(A+D2)Sin A2 where A is the angle of prism, and D is the angle of minimum deviation

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27.

Define the terms as applied to waves

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28.

Describe an experiment to determine velocity of sound using different tuning forks

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29.

Calculate the speed of sound and the end correction

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30.

Explain why open pipes are preferred to closed pipes of identical dimension in musical instruments

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31.

Find the frequency of the second harmonic

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32.

Define the terms as applied to waves

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33.

Describe an experiment to that frequency varies with tension in given wire

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34.

What is a stationary wave

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35.

Find the frequency of the third harmonic

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36.

Distinguish between stationary and progressive wave

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37.

What is a diffraction grating

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38.

A diffraction grating of 500lines per mm is illuminated normally by light of wave length 5.26X10-7m . Find the total number of images seen

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39.

Distinguish between constructive and destructive interference

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40.

What is meant by division of wave front

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41.

The polarized angle for light in air incident on glass plate is 57.50 .What is the refractive index of glass

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42.

Define the term interference of light

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43.

Explain how Newton's rings are formed

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44.

Describe the experiment to determine to determine wave length by Newton's rings

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45.

Define the terms as applied to waves

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46.

Describe an experiment to determine velocity of sound by Dust tube method.

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47.

Calculate the speed of sound and the end correction

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48.

Define the term Doppler effect

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49.

A cyclist heard sound as taxi by passed him moving in opposite direction. Derive the expression for sound detected if if a cyclist is moving with velocity V1 and taxi a velocity V2 given that speed in air is C.

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50.

State the laws of electromagnetism

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51.

With aid of diagram describe how an ac generator works

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52.

State and explain how the energy losses in transformer can be minimized

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53.

What is meant by Self induction

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54.

What is meant by Mutual induction

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55.

A transformer has secondary coil of 60 turns and primary coil 1200turns.it's secondary is connected to 3Ω resistor. If the primary coil is connected to 240V ac supply, Calculate the current flowing in primary coil, if the efficiency of transformer is 80% .

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56.

Define the terms magnetic flux and magnetic flux density

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57.

Derive the expression for force per unit length between two long parallel conductors carrying current.

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58.

A moving coil galvanometer reads 3mA when it is connected in series with a source of emf

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59.

Derive the expression for force per unit length between two long parallel conductors carrying current.

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60.

A moving coil galvanometer reads 3mA when it is connected in series with a source of emf of negligible internal resistance and resistor of resistance 200Ω. The galvanometer reads 20mA when 200Ω resistor is replaced with one of 400Ω . Find the (i) resistance of the galvanometer (ii) Emf of the source

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61.

A current of 4.0A flows through solenoid of 500 turns and length 60.0cm. Determine the magnitude of the force exerted on a particle of charge 20.0µC moving at 1500ms through the centre of solenoid at an angle of 160 relative to the axis of solenoid.

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62.

Define Root mean square value of an alternating current and Capacitive reactance

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63.

A sinusoidal alternating voltage V=8sin120πt volts is connected across resistor of 6Ω. Find the mean power dissipated in the resistor. Hence deduce the rms value of the current

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64.

Describe with aid of diagram, how hot iron ammeter works

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65.

A capacitor of capacitance C is connected across alternating voltage V=V0sinwt. (i) Find the current which flows in circuit (ii) Sketch using the same axes the voltage across the capacitor and the current which flows in circuit with time. (iii) Explain the phase difference between voltage and current in (ii) Above

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66.

An inductor of inductance L is connected across alternating voltage And current I=I0sinwt. Flows through it (i) Find the voltage across the inductor (ii) Sketch using the same axes the voltage across the inductor and the current which flows in circuit with time

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67.

An iron-cored coil of 2H and 50Ω resistance is connected in series with resistor of 450Ω , and a 100V,50Hz a.c supply is connected across the arrangement. Find (i) Current flowing in coil (ii) it's phase angle relative to the voltage supply Voltage across the coil

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68.

Define the terms Tesla and magnetic flux density

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69.

Write the expression for induced Emf on moving conductor in magnetic field Hence deduce expression for maximum Emf. Describe how simple dc motor works Give the energy losses in motor and how they are minimized

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70.

A galvanometer of resistance 15Ω gives a full scale deflection for a current of 5mA. Calculate the resistance required to convert it to a voltmeter reading up to 10V

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71.

A galvanometer of resistance 5Ω gives a full scale deflection for a current of 15mA. Calculate the resistance of shunt that can be used to convert it to an ammeter reading up to 5A

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72.

State coulomb's law of electrostatics

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73.

Describe how gold leaf electroscope can be used to test for charge

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74.

Describe experiment to show that charge resides outside hollow conductor

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75.

Four point charges of +5µC, -3µC, 7µC and +2µC are placed respectively at corners of a rectangle A, B, C and D of sides 8cm by 6cm in vacuum. (i) Sketch the electric field lines due to the charges (ii) Calculate the electric force at C. Electric potential at centre

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76.

Two point charges +1.0µC and 0.5µC are separated by 8.0cm in air as shown below. (i) Find the resultant electric field intensity at point P which is 5.0cm from each charge. (ii) Sketch the electric field pattern due to the charges distribution above

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77.

Define electric potential difference

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78.

Explain briefly hat happen to the potential energy as two point charges of the same sign are brought closer

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79.

Describe, with aid of diagram how a high voltage can be generated using Van de Graaff generator

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80.

Explain how two insulating bodies rubbed together acquire charge

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81.

Three point charges of +5µC, -3µC, and +2µC are placed at A,B, C respectively at three corners of a square of sides 1m in vacuum. (i) Sketch the electric field lines due to the charges (ii) Calculate the electric potential at the fourth corner D of the square. (iii) Find the electric potential energy, if a charge of -4µC is placed at the fourth corner

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82.

Define Capacitance of a capacitor and Farad Derive an expression for energy stored in a capacitor of capacitance C charged to a p.d, V

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83.

Explain the effect of placing an insulator between the plates of a charged capacitor. State two physical properties desirable in a material to be used as a dielectric in a capacitor

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84.

A battery of Emf 20V is connected across a system of capacitors as shown in figure below. Find the, (i) Charge on the 3µF capacitor. (ii) energy stored in the 4µF capacitor

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85.

Describe a simple experiment to show that capacitance of capacitor increases with surface area of the plates

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86.

Define electrical resistivity and state it's units What is meant by Emf and internal resistance of battery

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87.

Describe an experiment to determine Emf of cell using potentiometer wire

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88.

Explain why the resistance of metal increases when temperature of the metal is increased

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89.

The circuit below shows a uniform slide wire AB of length 100cm and resistance 15Ω. The wire is connected in series with resistor of resistance 5Ω across 3.0V battery. A cell of Emf E and internal resistance, r connected as shown. With the switch K1 and K2 open, the galvanometer shows no deflection when AD 75.0cm .With the switch K1 open and K2 closed, the galvanometer shows no deflection when AD is 65.0 cm. Find the (i) Value of Emf E (ii) Internal resistance, r. (iii) Balance length when K2 and K1 are closed

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90.

Define temperature coefficient of resistance Describe an experiment to determine temperature coefficient of resistance Derive the expression for balance condition for metre bridge

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91.

State Kirchhoff's laws of electricity Give the sign convention for each The figure below shows net work of resistors, Find the current flowing through each and the power lost in 10Ω resistor

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92.

Describe how the Emf of thermal couple may be determined In figure below AB is uniform wire of length 1.0m and resistance2.0Ω. with the switch K1 closed and K2 open the balance length AJ =0.75m. With K1 open and K2 closed the balance length AJ= 0.45m. Find the Emf of the thermocouple

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