Physics Paper 2 Form 4 Question Paper

Physics Paper 2 Form 4

Course:Physics

Exam Year:2016

1 Convex mirrors are used in cars as driving mirrors because they have a wide field of view.Sketch a well-labelled diagram to show the wide field of view.[2 mks]

2 Why is double stroke method of magnetization preferred to single stroke method? [2 mks]

3 Cathode ray oscilloscope{CRO} is more accurate voltimeter than moving coil voltimeter. Give two reasons in support to this statement. [2mks]

4 Differentiate between electromotive force and potential difference. [2mks]

5 Distinguish between thermionic and photoelectric emission. [2mks]

6 A gas occupies a volume V under pressure P. What volume will it be if pressure is doubled? [2mks]

7 A cell supplies a current of 1.8 A through two resistors connected in parallel. When the resistors are connected in series,the current is 0.6 A.Calculate the internal resistance of the cell. [3mks]

8 Arrange the following electromagnetic waves in order of increasing wavelength:
Ultraviolet,X-rays,radiowaves, Gamma rays [1mk]

9. (a)
[i] What is the effect on the wavelength of X-rays if the number of electrons hitting metal target are increased? [1mk]
[ii] What is effect on wavelength of x-rays when p.d across the tube is decreased. [1mk]

(b) Calculate the maximum velocity of electrons that would produce x-rays of frequency 8.0x10~8 Hz if only 20% of kinetic energy is converted to x-rays.[Take planks constant=6.63x10^-35 Js]

(c) An X-ray tube operating at a potential difference of 50 kV has a tube current of 20mA. Calculate:
[i] The electric power input. [2mks]

[ii] The number of electrons hitting the target per second. [2mks]

[iii] The velocity of the electrons when they hit the target. [3mks]

10 Explain the propagation of sound with reference to compression and rarefaction. [2mks]

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