Download ss2 phy 1st term exam past questions and answers

	     	   
                    	 	   FIRST TERM  EXAMINATION, 2010/2011 SESSION.
                      	   SUBJECT: PHYSICS 2    			 
             CLASS: SSS 2	       	         	TIME ALLOWED:2½HRS 
 
   INSTRUCTION: Answer ALL the questions. 
A substance undergoes a change of state when I. heat is added to it II. Force is applied to it III. Heat is removed from it. Which of the statements above is/are correct? A. I only B. II only C. I & II only D. I, II & III. 
Latent heat of fusion is given off I. By a substance as its temperature decreases II. When a substance changes from liquid to solid state III. When a substance expands. Which of the above statement is/are correct? A. I only B. II only C. I & III only D. II & III only
The rate of evaporation of a liquid is affected by the A. density B. humidity of the atmosphere C. presence of impurities D. volume of the liquid
A mass of gas at a temperature of 157oC and pressure of 760mmHg is cooled to 270C. Calculate its pressure if its volume remain constant A.48mmHg B. 131mmHg C. 530mmHg D. 570mmHg
Dew is A. moisture deposited on objects B. tiny water droplets in the atmosphere C. tiny water droplets in contact with the ground D. All the above
Why does melting ice cool an orange drink far better than the same quantity of ice-cold water? A. ice releases latent heat during melting B. the melting ice absorbs latent heat during melting C. the ice is at lower temperature than ice cold-water D. melting ice has a lower specific heat than ice-cold water
When drops of methylated spirit are applied to our body, it normally feels cool because the spirit A. evaporates easily B. extracts its latent heat of evaporation from the body C. gives away its latent heat of evaporation to the body. D. evaporates without boiling
The standard vapour pressure of a liquid depends on its a. Density B. temperature C. Volume D. pressure.
A liquid whose boiling point is 84oC is taken down to a deep well and its boiling point measured. We expect that the boiling point at the bottom of the well is A. still 840C B. less than 840C C. more than 840C D. depends on the temperature of the well
A heater marked 60W evaporates 6.0 x 10-5kg of boiling water in 60 seconds. What is the specific latent heat of vaporization of the water in J/Kg? A. 6.0 x 10-5 B. 6.0 x 105 C. 6.0 x 106 D. 3.0 x 105 
Specific latent heat of vaporization of a substance is the quantity of heat required to A. heat a unit mass of a substance through 10C B. Change the state of a unit mass of substance at its melting point C. boil all the substances present at the boiling point D. change the state of a unit mass of a substance at its boiling point.
When an athlete perspires after running, A. convention cools the body B. the body absorbs cold from the surrounding air C. evaporation occurs and helps to cool the body D. heat is conducted away from the body
A block of ice of mass 10kg at 00C absorbs heat energy from its surroundings and changes to water at the same temperature. The heat absorbed is referred to as A. heat capacity B. specific heat C. specific latent heat D. latent heat
What DOES NOT affect the rate of evaporation of liquid? A. volume of the liquid B. exposed surface area of the liquid C. temperature of the liquid D. humidity of the surrounding
How does the increase in pressure affect the boiling point and the freezing point of water? It A. lowers freezing point and increases boiling point B. increases the boiling point only C. lowers boiling point D. does not affect either of them




What name is given to the temperature at which water vapour present in the air is just sufficient to saturate the air? A. dew point B. ice point C. boiling point D. steam point.
When the saturated vapour pressure of a liquid equals the external atmospheric pressure, the liquid A. expands B. boils C. freezes D. evaporates
The average kinetic energy of molecules depends on A. pressure of the atmosphere B. relative humidity C. temperature D. number of molecules 
Calculate the heat required to melt completely a substance of mass 0.5kg initially at 500C if its melting point, specific latent heat and specific heat capacity are 600C, 20,000JKg-1 and 100J/kg/k respectively. 10,000J B. 15,000J C. 10,500J D.1,500J
On a day when the humidity of the air is very high, evaporation from water pond will be A. slow B. rapid C. zero D. decrease with increase in temperature
The statement: specific heat of fusion of ice is 336Jg-1 means that 336J is the quantity of heat energy which A. will raise the temperature of ice through 1k B. is required to change 1g of ice to water at its melting point C. is enough to vaporize 336g of water completely D. will change 1g of ice at 00C to water at 3360C
Which of the following processes does not reduce heat loss from a liquid in the calorimeter? A. constant stirring of the liquid B. lagging of the calorimeter C. using an insulated lid D. shielding the calorimeter from draught 
The mass of gas occupies 20cm3 at 50C and 760mmHg pressure. What is its volume at 300C and 800mmHg pressure? A. 41.4cm3 B. 0.4cm3 C.50cm3 D.20.7cm3 
A fixed mass of gas of volume 600cm3 at a temperature of 270Cis cooled at constant pressure to a temperature of 00C. What is the change in volume? A. 54.0cm3 B.546.0cm3 C.46.0cm3 D.300.0cm3   
A radio station broadcasts at a frequency of 600Hz. If the speed of light in air is 3 x 108m/s, calculate the wavelength of radio wave. A. 22.0 x 103m B. 5.0 x 102m C. 5.0 x 105m D. 11.8 x 1011m
Which of the following is not a property of longitudinal waves? A. compression B. reflection C. refraction D. polarization
Which of the following is correct about light and sound waves? Both A. are longitudinal waves B. are transverse waves C. have the same velocity in air D. transmit energy
A plane progressive wave is represented by the equation y = 0.2sin(200?t – 0.5x), where x and y are measured in cm and t in second. What is the frequency of the wave? A. 100.0Hz B. 0.5Hz C. 200.0Hz D. 10.0Hz
The pressure P, volume V and absolute temperature T of a given mass of an ideal gas change simultaneously. Which of the following equation is correct about the gas? A. PV = constant /T B. P/T = constant C. P/V = constant/T D. 1/T = constant
Dew point is not affected by A. temperature B. wind C. amount of water vapour in the atmosphere D. atmospheric pressure
Ability of waves to spread around corners is called A. polarization B. dispersion C. diffraction D. reflection
A certain wave has a speed of 20m/s. If the frequency of the wave is 0.25Hz, calculate the distance between successive crest of the wave A. 5.0m B. 40.0m C. 50.0m D.80.0m
The ripple tank system can generate I. Circular waves II. Plane waves III. Polarized waves A. I only B. II only C.III only. D. I & II only
A point on stationery wave where there is maximum displacement of the medium is called A. antinode B. amplitude C. crest D. mode


A glass bottle filled with water and kept in a freezer cracks on freezing because of the A. increase in the volume of the bottle on freezing B. decrease in the volume of water on freezing C. increase in the volume of the water on freezing D. increase in density of the water on freezing
A measure of the maximum displacement of a vibrating object is the A. amplitude B. cycle C. frequency D. period
A boy stands in front of a dressing mirror. Which of the following is he likely to observe? I. His image size equal to his actual size II. An inverted image of himself III. The mirror is exactly at the midpoint of the distance between himself and his image IV. A magnified image of himself A. I & II only II. I & III only C. II & IV only D. II & III only
What is the distance between anode an antinode for a transverse wave? A. wavelength B. half of the wavelength C. twice wavelength D. three quarter of wavelength 
Which of the following is not a mechanical wave? A. sound wave B. radio wave C. wave in a closed pipe D. wave propagated in a stretched string 
If V is the velocity of a wave, ? is its wavelength, and T is its period, then V, ? & T are related by the expression A. ? = VT B. ? = V/T2 C. V = T/? D = ?T 
Transverse and longitudinal waves travelling in the same direction in the medium differ essentially in their A. frequency B. amplitude C. direction of vibration of the particles of the medium D. wavelength 
Which of the following expressions about the image formed by a plane mirror is/are correct? A. I. Virtual II. Magnified III. Erect IV. Farther from the mirror than the object A. I only B. II & IV only C. I & II only D. I & III only
An image which is formed on the screen is said to be A. real B. virtual C. blurred D. inverted
The image of an object placed at 2f from a concave mirror is A. real, diminish, inverted B. real, same size, erect C. real, same size, inverted D. virtual, same size, inverted
A transparent rectangular block 5.0cm is placed on a black dot. The dot when viewed from above is seen 3.0cm from the top of the block. Calculate the refractive index of the material of the block. A. 2/5 B.3/5 C. 3/2 D. 5/3
When a ray of light passes obliquely through a rectangular block, A. it gets laterally displaced and the emergent ray is parallel to the incident ray B. It emerges without displacement parallel to the incident ray C. It gets dispersed into seven colours without any deviation D. It deviates without dispersion
The direction of light rays changes as it passes from one medium to another. The phenomenon is called A. diffraction B. reflection C. refraction D. dispersion 
The velocities of light in air and glass are 3 x 108m/s and 1.8 x 10m/s respectively. Calculate the sine of angle of incidence that will produce an angle of refraction of 300for  ray of light incidence on the glass A. 0.8 B. 1.2 C. 1.0 D. 0.6
Water waves are generated by dropping a stone in calm pool of water. If a small piece of cork is floating in the path of the wave, as the wave progresses, the cork will A. sink into the water B. move up and down about the same point C. move along with the waves towards the bank of the pool D. move towards the centre of the pool
In which of the following situations is expansion of a solid an advantage? A. buckling railway lines B. using bimetallic strip thermostat C. sagging the telephone wire D. seizing the bearings in motor vehicles
The distance between adjacent trough of a wave is 12m, if the wave travels 360m in 6 seconds, Calculate the frequency of the waves A. 5.0Hz B. 10.0Hz C. 20.0Hz D. 30.0Hz



Which of the following conditions is necessary for the occurrence of total internal reflection of light? A. light must travel from an optically less dense to a denser medium B. The angle of incidence must be equal to the critical angle C. The angle of incidence must be equal to the critical angle D. The angle of refraction must be 900  
The speed of radio wave in the air is 3 x 108m/s. Calculate the frequency of a broadcast on the 300m band A. 3 x 105Hz B. 1.0 x 108Hz C. 1.0 x 106Hz D. 9.0 x 1010Hz 
The working principle of a pressure cooker is based on the A. increase in volume of the steam inside B. complete trapping of heat inside it C. increase in the pressure of the pot D. decrease in the pressure of the pot. 
Which of the following is NOT an electromagnetic radiation? A. X-rays B. radio waves C. sunlight D. sound waves 
In which of the following groups are the radiation arranged in the increasing order of wavelength A. Gamma rays, X-rays, radio waves B. Gamma rays, radio waves, x rays C. radio waves, gamma rays, radio waves D. x-rays, Gamma rays, radio waves 
Which of the following statements is NOT correct? A. x-rays have smaller wavelength than ultra violet rays B. Gamma rays are less penetrating than x rays C. ultraviolet rays have shorter wavelength than visible light D. Gamma rays travel in straight lines
What is the speed of electromagnetic radiation in free space? A. 3.0 x 10-8m/s B. 3.0 x 106m/s C. 3.0 x 108m/s D. 3.0 x 106m/s
The refraction index of a medium relative to air is 1.8, Calculate to the nearest degree, the critical angle A. 680 B. 560 C. 180 D. 340   
A stick appears bent or broken when it is partially immersed in water. The phenomenon responsible for this observation is called A. refraction B. diffraction C. dispersion D. reflection.


















                                            



SECTION B.
PART (I)  ANSWER 5 QUESTIONS ONLY.

Analyse the difference between these two statements:
      (a)The specific heat capacity of water is 4200JKg/k
            (b)The specific latent heat of fusion of ice is 3.4 x 105J/Kg

(a) Define the term ‘image’
      (b) List and explain Two types of image

3    (a) List Two types of wave apart from light that can be plane-polarized.
      (b) State Two applications of plane polarized light.

4.  (a) State Three (3) characteristics of images formed by a plane mirror.
          (b) List Three (3) effects of rectilinear propagation of light

5.   A narrow beam of unpolarized light of intensity I is incident at angle   to the axis of the Polaroid. (a)          Explain the action of the Polaroid on the beam of unpolarized light.
      (b) Write down an equation for the intensity, I of the emergent polarized light.

6.   (a) Differentiate between	 (i) boiling point of a liquid and 
                                                 (ii) Melting point of a substance
            State Two factors each that can: (b) increase the boiling point of a liquid.
         					    (c) Lower the melting point of a substance.

7.  (a) Differentiate between transverse and longitudinal waves.
      (b) Give ONE example each of the types of waves mentioned in (a)

8.    (a) State Snell’s law of refraction.
(b) A parallel beam of unpolarized light is incident on a plane glass of refractive index 1.60 at an angle to the normal. If the reflected beam is completely polarized, calculate the angle incidence of the beam.

9 (a) Define the term ‘mirage’.
   (b) State two applications of total internal reflection.

    10. A coin lies at the bottom of a tank containing water to a depth of 130cm. If the refractive index of water is 1.3, calculate the apparent displacement of the coin when viewed vertically from above.
    (a) What is meant by the statement: the focal length of a concave mirror is 20cm.
     (b) Draw a ray diagram to show how a concave mirror is used as a shaving mirror.















SECTION B
PART II ANSWER 3 QUESTIONS ONLY.
(a) Explain (i) Wave (ii) Wave motion (iii) Stationary wave.
(b) (i) List four (4) physical properties of a wave.
      (ii) Define amplitude and use it to distinguish between the node and antinode of a wave.
(c)  The equation y = 5sin (3x-4t) where y is in millimetres, x in metres and t in seconds, represent a wave motion; determine the   (i) frequency (ii) period (iii) speed of the wave.
12. (a) Define the boiling point of a liquid.
(b) With the aid of a diagram, describe an experiment to determine the boiling point of a small quantity of liquid.
(c)  A piece of copper of mass 300g at a temperature of 950oc is quickly transferred into a vessel of negligible thermal capacity containing 250g of water at 25oc. If the final steady temperature of the mixture is 100oc, calculate the mass of water that will boil away.       Specific heat capacity of water = 4.2 x 103 J/kg/k.        Specific heat capacity of copper = 4.0 x 102 J/kg/k
                Specific latent heat of vaporization of steam = 2.26 x 102 J/kg.
                                                                                        May/June 2007.

13 (a) 	  (i) State Two differences between boiling and evaporation.
         	 (ii) Using kinetic theory of matter, explain why evaporation causes cooling.
(iii) Using kinetic theory of gases, explain why the volume of a fixed mass of gas at constant pressure increases with increase in temperature.
      (b) State two factors each which affect (i) boiling point of a liquid. (ii) rate of evaporation of a liquid.
      (c) (i) define dew point (ii) relative humidity (iii) On a certain day, the temperature and dew point of a sample of air were found to be 16oc and 10oc respectively. From a table, the corresponding saturation vapour pressure was obtained as 13.5mmHg and 9.2mmHg respectively. Calculate the relative humidity of the sample		Nov/Dec SSCE 2002.

14. (a) (i) Illustrate, using a ray diagram, how an image is formed by convex mirror.
(ii) State ONE advantage and ONE disadvantage of using a convex mirror as a driving mirror. (iii) Explain the action of a compound microscope.
      (b) Using a ray diagram also show how a virtual image can be formed by a CONCAVE mirror.
      (c)  An object of height 2.5cm is placed 20cm from a converging mirror of focal length 10cm. What is    the height of the image formed?
                                                                                                  May/June 2003.

15 (a) Explain (i) refraction of a wave (ii) critical angle.
(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 travelling at 3.6m/s is 0.45m.Calculate the frequency of the wave.
   (d)  A ray of light is incident at an angle 30o at air – glass interface (i) Draw a ray  diagram to show the deviation of the ray in the glass.(ii) Determine the angle of deviation(refractive index of the glass = 1.5)             May/June SSCE 2005.