www.prep.ng: February 2019

Thursday, 21 February 2019

JAMB/UTME 2015 PHYSICS QUESTIONS (TEXT)

We are currently working on it
1. A piece of rubber 10cm long stretches 6mm when a load of 100N is hung from it. What is the strain?
A.  6 X 10-3  
B. 6
C. 60
D. 6 X 10-3

2.  The diagram above shows the lens arrangement in
A. compound microscope
B. a binocular
C. an astronomical
D. a periscope

COMING SOON

3.  What is the total resistance in the above diagram?
A.5 ohms
B.25 ohms
C.15 ohms
D.35 ohms

4.  A body of mass 6kg rests on an inclined plane. The normal reaction R and the limiting frictional force is F as shown in the diagram (Fig. 2). If F is 30N and g=10ms-2, then the angle of inclination Ө is __.
A. 15°
B. 60°
C. 45°
D. 30°

5. The speed of light in air is 3.00 X 103ms-1. Its speed in glass having a refractive index of 1.65 is  
A. 1.82 x 108 ms-1
B. 3.00 x 108 ms-1
C. 4.95 x 108 ms-1
D. 1.65 x 108 ms-1

6. Longitudinal waves do not exhibit __.
A. refraction
B. polarization
C. diffraction
D. reflection

7. A device that converts sound energy into electrical energy is __.
A. the horn of a motor car
B. the telephone earpiece
C. a loudspeaker
D. a microphone.

8. A good calorimeter should be of __.
A. low specific heat capacity and low heat conductivity
B. high specific heat capacity and low heat conductivity
C. high specific heat capacity and low heat conductivity
D. low specific heat capacity and high heat conductivity.

9. Which of the following is most strongly deflected by a magnetic field?
A. β-particles
B. χ-particles 
C. γ-rays.
D. χ-rays

10.If a beaker is filled with water, it is observed that the surface of the water is not horizontal at the glass-water interface. This behaviour is due to __.
A. friction
B. surface tension
C. viscosity
D. evaporation

11.A dynamo primarily conducts __.
A. potential energy into kinetic energy
B. electrical energy into kinetic energy
C. mechanical energy into electrical energy
D. kinetic energy into potential energy

12. A particle is injected perpendicularly into an electric field. It travels along a curved path as depicted in the figure 3. The particle is __.
A. gamma ray
B. a proton
C. a neutron
D. an electron

13.  In which of the following diagrams is the length of the length tube equal to one wavelength?

14. A calibrated potentiometer is used to measure the e.m.f. of a cell because the __.
A. internal resistance of a cell is small compared with that of the potentiometer
B. potentiometer takes no current from the cell
C. potentiometer has a linear scale
D. resistance of the potentiometer is less than that of a voltmeter

15. Which of the following is a vector?
A. Electric charge
B. Electric potential difference
C. Electric field
D. Electrical capacitance.

16. The photocell works on the principle of the __.
A. voltaic cell
B. photographic plate
C. emission of protons by incident electrons
D. emission of electrons by incident radiation

17. When an atom loses or gains a charge, it becomes __
A. an ion
B. an electron
C. a neutron
D. a proton

18. Which of the following characteristics of a wave is used in the measurement of the depth of the sea?
A. Diffraction
B. Reflection
C. Refraction
D. Interference

19. Which of the following are produced after a nuclear fusion process?
1. One heavy nucleus 11. Neutrons III. Protons IV. Energy
A. I and II
B. II and III
C. I and IV
D. II and IV.

20. Two similar kettles containing equal masses of boiling water are placed on a table. If the surface of one is highly polished and the surface of the other is covered with soot, which of the following observations is correct?
A. The two kettles will cool down at the same rate
B. The polished kettle cools down more quickly by conduction
C. The kettle covered with soot cools down more quickly because it is a good radiator of heat
D. The kettle covered with soot cools down more quickly by the process of heat convection.

21. Total eclipse of the sun occurs when the __.
A. moon is between the sun and the earth 
B. sun is between the moon and the earth
C. the earth is between the moon and the sun
D. ozone layer is threatened.

22. Which of the following pairs of colours gives the widest separation in the spectrum of white light?
A. Green and Yellow
B. Red and violet
C. Red and indigo
D. Yellow and violet.

23. Which of the following with respect to a body performing simple harmonic motion are in phase?
A. Displacement and velocity of the body
B. Displacement and force on the body
C. Velocity and acceleration of the body
D. Force acting on the body and the acceleration

24. A uniform metre rule weighing 0.5N is to be pivoted on a knife-edge at the 30cm-mark. Where will a force of 2N be placed from the pivot to balance the metre rule?
A. 95cm
B. 5cm
C. 20cm
D. 25cm

25. A solid weighs 10.0N in air, 6.0N when fully immersed in water and 7.0N when fully immersed in a certain liquid X. Calculate the relative density of the liquid.  

A. ¾
B. 4/3
C. 5/3

D. 7/10

26. The diagram above shows a maximum and minimum thermometer divided into three portions P, Q and r. which of the following is true about the respective content of p, q and R?
A. Air, alcohol and mercury
B. alcohol, mercury and alcohol
C. mercury, alcohol and mercury
D. Air, mercury and alcohol

27.The process of energy production in the sun is ___.
A. nuclear fission
B. nuclear fusion
C. electron collision
D. radioactivity decay

28. The particle is responsible for nuclear fusion in a nuclear reactor is ___.
A. electron
B. Photon
C. proton
D. Neutron

29. if the uncertainty in the measurement of the position of a particle is 5×10-10 m, the uncertainty in the momentum of the particle is ___.
A. 1.32×10-24 Ns
B. 3.30×10-44 Ns
C. 1.32×10-44 Ns
D. 3.30×10-24 Ns
                                                            [h=6.6 ×10-34Js]
30. The change in volume when 450kg of ice is completely melted is
A. 0.50m
B.0.45m3
C. 4.50m3
D.0.05m3[density of ice =900kgm-3
                                                            Density of water=1000 kgm-3]

31. When impurities are added to semi-conductors, the conductivity of the semi-conductor __.
A. decreases
B. increases then decreases
C. decreases
D. remains constant

32. The process through which free electrons leave the hot surface of hot metal is known as ___.
A. photo emission   
B. thermionic emission
C. photon emission
D. electron emission

33. The production of pure spectrum could easily be achieved using a ___.
A.    Triangular prism only
B.    Triangular prism with two concave lens
C.   Glass prism with a pin
D.   Triangular prism with two convex lens.

34. A short chain is something attached to the back of a petrol tanker to __.
A.    Conduct excess charges to the earth
B.    Ensure the balancing of the tanker
C.   Caution the driver when over speeding
D.   Generate more friction

35. A perfect emitter or absorber of radiant energy is a __.
A.    White body
B.    Red body
C.   Conductor
D.   Black body

36. 

Six identical cells, each of e.m.f 2V are connected as shown above. The effective e.m.f of the cell is __.
A.   4V
B.   0V
C.   6V
D.   12V
37. If a pump is capable of lifting 5000Kg of water through a vertical height of 60 m in 50 mins, the power of the pump is __.
A.    2.5×105Js-1
B.    3.3 × 103Js-1
C.   2.5 ×104 Js-1
D.   3.3 × 102Js-1

38. The distance between two successive crest of a wave is 15 cm and the velocity is 300Ms-1. Calculate the frequency.
A.    4.5 × 105 Hz
B.    4.5 × 102 Hz
C.   2.0 × 103 Hz
D.   2.0 × 102 Hz

39. An electric lamp marked 240V, 60 Watts is left to operate for an hour. How much energy is generated by the filament?
A.    3.86 × 105 J
A.    B 2.16 × 105 J
B.    1.80 × 104 J
C.   3.56 × 105 J

40. In comparing the camera and human eye, the film of the camera functions as the __.
A.    Iris
B.    Pupil
C.   Retina
D.   Cornea

ANSWER KEYS
1.    A
2.    C
3.    B
4.    D
5.    A
6.    B
7.    C
8.    D
9.    A
10.  B
11.  C
12.  D
13.  A
14.  B
15.  C
16.  D
17.  A
18.  B
19.  C
20.  D
21.  A
22.  B
23.  C
24.  D
25.  A
26.  B
27.  C
28.  D
29.  A
30.  D
31.  A
32.  B
33.  D
34.  A
35.  D
36.  A
37.  B
38.  A
39.  B
40.  C



JAMB/UTME 2016 PHYSICS QUESTIONS (TEXT)

1. What is the least possible error encountered when taking measurement with a meter rule?
A. 0.5 mm
B. 1.0 mm
C. 0.2 mm
D. 0.1 mm


2. The electromotive force in the secondary winding is __.
A. stabilizing
B. reducing
C. increasing
D. varying

3. If a pump is capable of lifting 5000 kg of water through a vertical height of 60 in 15 mins, the power of the pump is __.
A. 3.3 × 103 Js-1
B. 2.5 × 104 Js-1
C. 2.5 × 105 Js-1
D. 3.3 × 102 Js-1

4. Calculate the temperature change when 500 J of heat is supplied to 100g of water.
A. 12.1°C
B. 2.1°C
C. 1.2°C
D. 0.1°C

5. Which of the following particles CANNOT be deflected by both electric and magnetic fields?
A. Gamma rays
B. Alpha particles
C. Wave particles
D. Beta particles

6. Under which of the following conditions do gasses conduct electricity?
 A. High pressure and low p.d
 B. Low pressure and high p.d
 C. Low pressure and low p.d
 D. High pressure and high p.d

7. Dispersion occurs when white light passes through a glass prism because of the __.
 A. defects in the glass
 B. high density of the glass
 C. different speeds of the colours in the glass
 D. different hidden colours in the glass
8. Calculate the e.m.f of the cell in the above circuit if its internal resistance is negligible.
 A. 12V
 B. 36V
 C. 2V
 D. 8V

9. An object of mass 80kg is pulled on a horizontal rough ground by a force of 500 N. Find the coefficient of static friction.
 A. 0.6
 B. 0.4
 C. 1.0
 D. 0.8.     [ g ≈ 10ms-2)]

10. The diagram above shows plank RS pivoted at its centre of gravity O and is in equilibrium with the weighs P and Q. If a weight 2P is added to P, the plank will be in equilibrium again by __.
 A. moving P nearer to O
 B. moving Q nearer to O
 C. adding a weight Q to
 D. moving P further away from O

11. A glass plate 0.9 cm thick has a refractive index of 1.50. How long does it take for a pulse of light to pass through the plate?
 A. 3.0 x 10-10s
 B. 4.5 x 10-11s
 C. 3.0 x 10-11s
 D. 4.5 x 10-10s    [c= 3.0 x 108 ms-1]

12. The main purpose of the transformer in an a.c radio set is to __.
 A. increase power to the radio
 B. convert energy from a.c. to d.c
 C. step up the voltage
 D. step down he voltage

13. The energy associated with the emitted photon when a mercury atom changes from one state to another is 3.3 ev. Calculate the frequency of the photon.
A. 3.2 x 10-53 Hz.
B. 3.1 x 10-52Hz
C. 1.3 x 10-15Hz
D. 8.0 x 10-14 Hz

14.  In the reaction above, X is __.
A. electron
B. neutron
C. neutrino
D. proton

15. To protect a material from the influence of an external magnetic field, the material should be kept in a __.
A. soft iron ring
B. loop of copper wire
C. triangular zinc ring
D. square steel ring

16. The refractive index of the medium M in the diagram above is __.
A. 2/3
B. √3
C. 1/3
D. 2√3

17. Thermal equilibrium between two objects exists when __.
A. the heat capacities of both objects are the same
B. the quantity of heat in both objects are the same
C. the temperature of both objects are equal
D. one object loses heat continuously to the other

18. Which of the following is a characteristic of stationary waves?
A. The anti-node is a point of minimum displacement
B. The distance between two successive nodes is one wavelength
C. They can be transverse or longitudinal
D. They are formed by two identical waves travelling in opposite direction

19. The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20 km above the ground level is __.
A. 480mmHg
B. 570mmHg
C. 190mmHg
D. 380mmHg

20. A metal of mass 0.5kg is heated to 100 0 and then transferred to a well –lagged calorimeter of heat capacity 80 JK-1   t containing water of heat capacity 420 JK-1  at 15°C. If the final steady temperature of the mixture is 25°C, find the specific heat capacity of the metal.
A.92 J kg-1 K-1
B.286 J kg-1 K-1
C. 133 J kg-1 K-1
D. 887 J kg-1 K-1

21. In the series a.c circuit shown above, the p.d across the inductor is 8   Vr.m.s. and that across the resistor is 6 Vr.m.s. The effective voltage is  __.
A.  10 V
B.  2 V
C.  14 V
D.  48 V

22.In a closed organ pipe producing a musical note, an anti node will always be produced at __.
A. the closed end
B. the middle
C. the open end
D. all the parts of the pipe

23.What happens when a certain quantity of pure ice is completely changed to water at 0cnnnn ?
A. Latent heat is absorbed, the mass decreases and the volume increases
B. latent heat is absorbed, the mass remains constant and the volume decreases
C. latent heat is given out, the mass increases and the volume remains constant
D. latent heat is given out, the mass remains constant and the volume decreases

24. In the diagram above, PQ and R  are vectors. Which of the following options gives the correct relationship between the vectors?
A. P =Q +R
B.  P= Q – R
C. P= R – Q
D. P+ Q +R = O

25.  If two parallel conductors carry currents flowing in the same direction, the conductors will
A. repel each other
B. attract each other
C. both move in the same direction
D. have no effect on each other

26. Which of the following correctly explain(s) why a green leaf appears green in a bright daylight?  I. It absorbs only the green component of sunlight
II. It absorbs all colours in sunlight except green
III. It reflects only the green component of sunlight
A. I only
B. II and III only
C. I and II only
D. II only

27.  Which of the following factors has no effect on the e.m.f of a primary cell?
A. nature of plate
B. size of the cell
C. temperature
D. nature of the electrolyte

28.When the bottom tip of a vibrating tuning fork is held in contact with a wooden box, a louder sound is heard. this phenomenon is known as __.
A. beats
B. echoing
C. reverberation
D. resonance

29. A particle of mass M which is at rest splits up into two. If the mass and the velocity of one of the particles are m and v respectively, calculate the velocity of the seconds particle.

30. The electrochemical equivalent of silver is 0.0012g/C if 36.0g of silver is to be deposited by electrolysis on a surface by passing a steady current for 5.0 minutes, the current must be __.
A. 6000A
B.  100A
C. 100A 
D. 1.0A

31. The principle of operation of an induction coil is based on ___.
A. Faraday’s law
B. Ampere’s law
C. Ohm’s law
D. Coulomb’s law

32. A radioactive sample initially contains N atoms. After three half – lives the number of atoms that have dis integrated is __.


33. Mercury is suitable as a barometric fluid because it __.
A. expands uniformly
B. is several times denser than water 
C. is opaque
D. is a good conductor of heat

34. Which of the following features is NOT a characteristic of natural radioactivity?
A. radioactivity is a nuclear phenomenon
B. radioactivity is exhibited only by the element of mass number greater than 206
C. The radioactivity of an element is affected by electric and magnetic fields in the surroundings
D Radioactive substances emit three types of radiations ∝-rays, β-rays and γ-rays

35. Which of the following is a correct explanation of the INERTIA of a body?
A. Reluctance to start moving at rest and its reluctance to stop moving once it has begun move
B. Reluctance to stop moving
C. Readiness to start moving
D. Reluctance to start moving and its readiness to stop moving once it has begun to move

36. If the force on a charge of 0.2 coulomb in an electric field intensity is 4N, then the electric field intensity of the field is __.
A. 0.8
B. 20.0 N/C
C. 0.8N/C
D. 4.2N/C

37. The point beyond which a stretched spring does not return to its original length is called the __.
A. breaking point
B. sprint constant
C. elastic limit
D. elasticity point

38. Which of the following statements is applicable to a real image formed by a concave mirror?
(i) It can be observed on a screen
(ii) It is always inverted and in front of the mirror
(iii) It only seems to exist
(iv) It is formed by the actual converging of rays of light.
A. (i), (ii) and (iii) only
B. (i), (ii) and(iv) only
C. (i) and (iii only)
D. (i) and (ii) only

39. which of the following does not cause a reduction of the surface tension of water?
A. soap solution
B. detergent
C. alcohol
D. grease

  40. in what range of temperature is the expansion of water anomalous?
 A. +208°C to +212°C
B. -80°C to -76°C
C. 0°C to +4°C
D.- 4°C TO 0°C

ANSWERS

1. B
2. C
3. A
4.C
5. A
6. B
7. C
8. D
9. A
10. B
11. C
12. D
13. D
14. B
15. A
16. B
17. C
18. D
19. A
20. C
21. A
22. C
23. B
24. D
25. A
26. B
27. C
28. D
29. B
30. C
31. A
32. D
33. B
34. C
35. A
36. B
37. C
38. A
39. D
40. C

JAMB/UTME 2017 PHYSICS QUESTIONS (TEXT)



1.    The focal length of a concave mirror is 2.0 cm . If an object is placed 8.0cm from it, the image is at __.
A. 2.7m 
B. 2.3m 
C.2.5m 
D. 2.0m

2.    PHCN measures is electrical energy in __.
A. Wh 
B. Kwh 
C. J 
D. W

3.    The resultant of two forces is 50N. If the forces are perpendicular to each other and one of them makes an angle 30° with the resultant. Find its magnitude? 
A. 100.0N 
B. 57.7N 
C. 25.0N 
D. 43.3N

4.    A piece of radioactive material contains 1000 atoms. If its half-life is 20 seconds, the time                    taken for 125 atoms to remain is __.
A. 20 seconds 
B. 40 seconds 
C. 60 seconds 
D. 80 seconds

5.    The correct expression for the potential at a point, distance r from a charge q, in a electric field is 

6.    A typical transistor characteristic is represented as 


7.    In a discharge tube, most of the gas is pumped out so that electricity is concluded at 
A. steady voltage 
B. high pressure 
C. low pressure
D. low voltage

8.    I. Moon II. Sun III. Street light IV. Stars Which of the above is a natural source of light? 
A. I, II and IV only 
B. I. II and III only 
C. III and IV only 
D. II and IV only

9.    An object placed at the bottom of a well full of clear water appears closer to the surface due to __.
A. refraction
B. reflection
C. am inverter 
D. a magnifier

10.A boy drags a bag of rice along a smooth horizontal flow with a force of 2N applied at an angle of 60° to the flow. The work done after a distance of 3m is __.
A. 6 J. 
B. 4 J 
C. 5 J 
D. 3 J

11.The spheres of masses 5.0kg and 10.0kg are 0.3m apart. Calculate the force of attraction between them?
A. 3.57 X  10-2 N
B. 3.71 X  10-8 N
C. 4.00 X  10-2 N
D. 3.50 X  10-10 N

12.When very hot water is poured into two identical thin and thick glass tumblers in equal volumes, the thick one cracks because __.
A. of the even expansion of glass
B. glass is a good conductor of heat
C. glass is a crystal 
D. of the uneven expansion of glass

13.The diagram above represents the stress-strain for atypical metal rod. What does X represent?         A. Yield point 
B. Breaking point 
C. Elastic limit 
D. proportional limit

14.Transverse waves can be distinguished from longitudinal waves using the characteristic of __.
A. diffraction 
B. reflection 
C. polarization
D. refraction

15.Which of the following pairs of light rays shows the widest separation in the spectrum of white light? 
A. Green and yellow
B. Blue and red 
C. Indigo and violet 
D. Orange and red

16.Which of the following graphs shows the correct vector diagram for the circuit above?

17.A transistor functions mainly as a __.
A. switch and an amplifier 
B. rectifier and an amplifier 
C. charge storer and a switch 
D. charge storer and an amplifier

18.A thin wire with heavy weights attached to both ends is hung over a block of ice resting on two supports. If the wire cuts through the ice block while the lock remains solid behind the wire, the process is called __.
A. fusion 
B. sublimation 
C. regelation 
D. condensation

19.The inner diameter of a small test tube can be measured accurately using a __.
A. micrometer screw gauge 
B. pair of Vernier callipers 
C. metre rule 
D. pair of dividers

20.A platinum resistance thermometer records 3.0W at 0°C and 8/0w at 100°C. If it records 6.0W in a certain environment, the temperature of the medium is __.
A. 60°C 
B. 80°C 
C. 50°C 
D. 30°C

21.In the diagram above, which of the angles  Ɵ1, Ɵ2, Ɵ3  and  Ɵ4 is the angle of deviation of a ray of light passing through XYZ? 
A. Ɵ2
B. Ɵ3
C. Ɵ1
D. Ɵ4

22.Which of the following is the dimension of pressure? 
     A. ML2 T-3
     B. MLT-2
     C. ML-1 T-2
     D. ML-3

23.A capacitor 8µF, is charged tp a potential difference of 100V. The energy stored by the capacitor is __.
A. 1.0 × 104 J
B. 4.0 × 10-2 J
C. 1.25 × 10 J
D. 8.0 × 10 J

24.Which of the following statements correctly describe(s) cathode rays? I. They consist of tiny particles carrying negative electric charges II. They are deflected in a magnetic field but not in an electric filed. III. They consist of fast-moving neutrons and deflected in an electric filed. 
A. I only 
B. III only 
C. I and II only 
D. II and III only

25.A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object? 
A. 12cm 
B. 24cm 
C. 48cm 
D. 108cm

26.The net capacitance in the circuit shown above is __.
A. 8.0 µF 
B. 6.0 µF 
C. 2.0 µF 
D. 4.0 µF

27.A sonometer wire of length 100cm under  a tension of 10N, has a frequency of 250Hz. Keeping the length of the wire constant, the tension is adjusted to produce a new frequency of 350Hz. The new tension is __.
A. 5.1N 
B. 19.6N 
C. 14.0N 
D. 7.1N

28.In a sound wave in air, the adjacent rarefactions and compressions are separated by a distance of 17cm. If the velocity of the sound wave is 340ms-1
 Determine the frequency. 
A. 10Hz 
B. 20Hz 
C. 5780Hz 
D. 1000Hz

29.A note is called an octave of another note when __.
A. the notes have the same fundamental frequency 
B its frequency is half of the first note. 
C. its frequency is twice that of the first note 
D. its periodic time is twice that of the first note.

30.A metallic strip of iron and brass was heated. Which of the following diagrams accurately illustrated the shape of the strip after heating?

31.Which of the following is in a neutral equilibrium? 
A. A heavy weight suspended on a string 
B. The beam of a balance in use 
C. A heavy-based table lamp 
D. A cone resting on its slant edge

32.A convex mirror is used as a driving mirror because I. Its image is erect II. It has a large field of view III. It has a long focal length. Identify the CORRECT statement(s). 
A. I and III only 
B. I and II only 
C. II and III only 
D. I, II and III only

33.What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 kobo per kWh? 
A. 0.13 
B. 0.65 
C. 3.90 
D. 39.00  

34.The specific latent heat of vaporization of a substance is always __.
A. less than its specific latent heat of fusion 
B. equal to its specific latent heat of fusion 
C. greater than its specific latent of fusion 
D. all of the above depending on the nature of the substance

35.A hydrometer is an instrument for measuring the __.
A. depth off water in a vessel 
B. relative humidity of the air 
C. relative density of a liquid by finding the apparent loss in weight 
D. relative density of a liquid  by the method of flotation

36.A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil. If the input voltage is 100 volts, the output voltage is __.
A. 10 volts 
B. 5 volts 
C. 15 volts 
D. 20 volts

37.The activity of a radioactive substance depends on __.
A. temperature and purity 
B. purity and age       
C. temperature and age 
D. age, purity and temperature

38.The speed of light in air is 3 x . If the refractive index of light from air-to-water is 4/3, then which of the following is the correct value of the speed of light in water?
A. 4 × 108 ms-1
B. 2.25 × 108 ms-1
C. 2.25 × 108 ms-2

B. 4/9 × 10-8 ms-1

39.A magnet is moved through a coil of wire. The e.m.f. produced in the wire depends on __.
A. the number of turns in the coil 
B. the strength of magnet 
C. the speed at which the magnet is moved 
D. all of the above

40.A charge of one coulomb liberated 0.0033g of copper in an electrolytic process. How long will it take a current of 2A to liberate 1.98g of copper in such a process? 
A. 30 minutes 
B. 5 minutes 
C. 50 minutes 
D. 60 minutes

ANSWERS

1.    A
2.    B
3.    D
4.    D
5.    A
6.    B
7.    C
8.    D
9.    A
10.C
11.B
12.D
13.A
14.C
15.B
16.A
17.D
18.C
19.B
20.A
21.B
22.C
23.B
24.D
25.A
26.C
27.B
28.D
29.C
30.A
31.D
32.B
33.A
34.C
35.D
36.D
37.C
38.B
39.D
40.B