HomeExamination QuestionsPHYSICS FIRST TERM EXAMINATION SS 1

PHYSICS FIRST TERM EXAMINATION SS 1

   FIRST TERM

 

Examination malpractices may lead to a repeat of the subject or suspensions don’t be involved.

SUBJECT: PHYSICS                   TIME: 2HRS             CLASS: SS  1

SECTION A (OBJECTIVES)

Instruction: Answer ALL questions in this section. All question carries equal mark

Constants: Unless otherwise stated, used these constants (c=3.0×108 ms-1, e = -1.6×10-19C, Me = 9.1×10-31kg, take 1/4πɛ◦=9.0×109, G= 6.67×10-11Nm2kg-2, g=10m/s2)

  1. The unit of momentum is (a) J/s (b) Ns (c) N/s (d) Nms
  2. The best instrument for measuring the diameter of a thin wire is (a) Vernier caliper (b) steel rule (c) micrometer screw gauge (d) meter rule
  3. The SI unit of weight is (a) N (b) m (c) m/s2 (d) kg
  4. What is the reading on the micrometer screw gauge below?

 

 

0                  15

 

 

 

  • 511 (b) 8.011 (c) 8.519 (d) 8.151
  1. Given that MxLyTz is the dimension of pressure, what is the values of x,y and z respectively (a) 1,-1,-2 (b) -1,1,-1 (c) 1, -2, -1 (d) 1, -1, -1
  2. The dimension for acceleration is (a) LT (b) LT-1 (c) LT2 (d) LT-2
  3. The unit of luminous intensity is (a) light (b) candela (c) mole (d) newton
  4. What is the reading the vernier caliper is showing?

 

 

 

  • 8          9          10

 

 

 

  • 13 (b) 7.21 (c) 7.12 (d) 7.31
  1. Which of the following is odd? (a) Random motion (b) rotational motion (c) nuclear motion (d) oscillatory motion.
  2. The motion of a boy in 100m race is (a) random (b) translational(c) rotational (d) vibratory
  3. A man runs a distance of 1.0km in 5 minutes. His average speed is (a) 20.0m/s (b) 16.7m/s (c) 3.3m/s (d) 0.3m/s
  4. A train travelling with an initial velocity of 20m/s is subjected to a uniform deceleration of 2m/s2. The time required to bring the train to a complete halt is (a) 5s (b) 10s (c) 20s (d) 40s
  5. The average power needed to lift a 50kg load to a height of 25m in 2minutes is (a) 10.4W (b) 104.2W (c) 6250W (d) 625W
  6. Which of the statement is correct (a) static friction is less than dynamic friction (b) static friction equals dynamic friction (c) static friction is greater than dynamic friction (d) none of the arrange
  7. A metal block of mass 5kg lies on a rough horizontal platform. If a horizontal force of 8N applied to the block on the platform, then the coefficient of limiting friction between the block and the platform is: (a) 0.16 (b) 0.63 (c) 0.80 (d) 1.06
  8. An object of mass 20kg is released from a height of 10m above the ground level. The kinetic energy of the object just before it hits the ground is (a) 4000J (b) 2000J (c) 500J (d) 200J
  9. An engine develops a power of 750W while moving a car at constant velocity 3m/s. The force exerted on the car by the engine is (a) 83.3N (b) 250.0N (c) 750.0N (d) 2250.0N
  10. A girl of mass 20kg climbing a flight of stairs expends energy at the rate of 50W. The time taken for her to reach a height of 20m is (a) 16s (b) 32s (c) 8s (d) 160s
  11. If the angle between the inclined length and the horizontal platform of an inclined plane is 600 calculate the coefficient of friction (a) 0.86 (b) 1.73 (c) 0.50 (d) 0.73
  12. A car moving with speed 90kmhr-1 was brought uniformly to rest by the application of brakes in 10s. How far did the car travel after brakes were applied (a)120m (b) 150m (c) 125m(d)15km
  13. The slope of distant-time graph for a uniform rectilinear motion of a body represents (a) its acceleration (b) its total distance travelled (c) its speed (d) the force causing the motion
  14. The distance traveled by a particle starting from rest is plotted against the square of the time elapsed from the commencement of motion. The resulting graph is linear. The slope of this graph is a measure of (a) initial displacement (b) initial velocity (c) acceleration (d) half of acceleration
  15. What is the height of a cylindrical iron if the density is 7900kg/m3? The mass is 700kg and the radius is 0.1m (a) 2.918m (b) 2.819m (c) 3.418m (d) 4.328m
  16. Which is the correct unit of density? (a) m3/kg (b) kg/m (c) kg/m3 (d) m/v
  17. What volume of alcohol with density of 8.4×102kgm-3 will have the same mass as 4.2m3 of alcohol whose density is 7.2×102kgm-3? (a) 1.4m3 (b) 6.3m3 (c) 4.9m3 (d) 3.6m3
  18. For which of the following sets are the units fundamental? (a) density, length and pressure (b) impulse, mass and time (c) volume, mass and density (d) length, time and mass
  19. What is the height of a cylindrical iron if the density is 7900kg/m3, the mass is 700kg and the radius is 0.1m (a) 2.918cm (b) 2.819m (c) 3.418m (d) 4.328m
  20. A piece of cork density 0.25×103kgm-3 floats in a liquid of density 1.25×105kgm-3, what fraction of volume of the cork will be immersed? (a) 5 (b) 1/5 (c) 2/5 (d) 1/3
  21. A man of mass 50kg ascends a flight of stairs 5m high in 5seconds. If acceleration due to gravity is 10m/s2, the power expended is (a) 100W (b) 250W (c) 500W (d) 400W
  22. A boy of weight 300N climbs to the top of a hill of height 20m. The work done by the boy against the force of gravity (a) 6000J (b) 600J (c) 320J (d) 15J
  23. A body initially at rest is accelerated at the rate of 0:2m/s for 5s under a constant force of 50N. The work done on the body is (a) 10J (b) 50J (c) 125J (d) 250J
  24. The kinetic energy of a bullet fired from a gun is 40J. If the mass of the bullet is 0.1kg, calculate the initial speed of the bullet (a) 4.0ms-1 (b) 40.0ms-1 (c) 28.28 ms-1 (d) 20.0ms-1
  25. A diver is 5.2m below the surface of water of density 103 kg/m If the atmospheric pressure is 1.02 x 105 pa. Calculate the pressure on the diver. (g=10m/s2) (a) 6.02 x 104 pa (b) 1.02 x 105 pa (c) 1.54 x 105 pa (d) 5.20 x 105 pa
  26. Force (N)

100

 

 

 

A                                                Displacement (m)

0,0                  10                20

Using the force – displacement diagram shown above, calculate the work done

(a) 2000J (b) 1000J (c) 20J (d) 5J

  1. A body rolls down a slope from a height of 100m. Its velocity at the foot of the slope is 20ms-1. What percentage of its initial potential energy is converted into kinetic energy? (g=10ms-2) (a) 40% (b) 35% (c) 20% (d) 15%
  2. The following are examples of renewable energy except (a) biomass (b) solar (c) wind (d) nuclear
  3. A boy of mass 50kg runs up a set of steps of total height 3.0m. Find the work done against gravity (a) 1200J (b) 1500J (c) 1000J (d) 1300J
  4. A car travels at an average speed of 100km/h. What distance does it cover in 5minutes? (a) 8.3km (b) 10km (c) 5.3km (d) 120km
  5. Given that a force F acting on a block is inclined at an angle of ɵ to the horizontal of the block. The force that tends to lift the block up is (a) Fcos ɵ (b) Fsin ɵ (c) Ftan ɵ (d) 2Ftan ɵ
  6. Find the potential energy of a boy of mass 10kg standing on a building floor 10m above the ground level (a) 10J (b) 100J (c) 1000J (d) 1J
  7. A water pump raises 400g of water to a height 1500cm in 2 seconds. What is the power of the pump? (a) 30 (b) 60 (c) 300 (d) 600
  8. Viscosity opposes motion of an object in (a) solid (b) liquid only(c) gas only (d) liquid & gas
  9. Which of the following statements about viscosity are correct? When a ball falls through a viscous liquid (i) viscosity opposes the gravitational force on the ball (ii) viscosity opposes the upthrust on the body (iii) viscosity is in the same direction as the upthrust on the ball (iv) the ball falls faster in a more viscous liquid (a) I and II (b) I and III (c) II and IV (d) III and IV
  10. A 30 litre petrol tank of mass 12kg is filled with petrol of relative density 0.70. The mass of the filled tank is ….. (density of water =1g/cm3) (a) 15.5kg (b) 25.0kg (c) 33.0kg (d) 47.0kg
  11. A body weighs 50N in air displaces 3.7kg of water when partially immersed in water. The upthrust on the body is (a) 8.7N (b) 13.0N (c) 37.0N (d) 87.0N
  12. A block of mass 2.5kg was made to slide on a rough horizontal ground. If the coefficient of friction is 0.5. Find the frictional force between the ground and the block (a) 12.5N (b) 125N (c) 10.0N (d) 100N
  13. The SI unit of velocity gradient is (a) m/s (b) s-1 (c) m/s2 (d) ms
  14. Terminal velocity is attained when (a) w + v = u (b) w = v – u (c) w + u = v (d) w = v + u
  15. The volume of a substance is measured in (a) m3 (b) m2 (c) m (d) none
  16. Which of the following statements is true of viscosity (i) it is responsible for different rate of fluid flow (ii) it is not affected by temperature (iii) it is independent of pressure and density (a) I only (b) II and III only (c) I and III only (d) all of the above

 

SECTION B (THEORY)

Instruction: Attempt any THREE questions in this section

  1. (a) Derive the dimension for (a) density (b) pressure           (3 marks)

(b) Distinguished between mass and weight                                       (3marks)

(c) a boy drags bag of rice along a smooth horizontal floor with a force of 2N applied at an angle of 600 to the floor. Calculate the work done after a distance of 3m                                                  (4 marks)

  1. (a)(i) State two laws governing solid friction           (2marks)

(ii) State two advantages of friction                                                 (2marks)

(iii) State two disadvantage of friction                                       (2marks)

(b) A body of weight 8N rest on a plane inclined at an angle of 600to the horizontal (i) what force keeps it sliding down the plane? (ii) What is the coefficient of friction?                                                                   (4marks)

  1. (a) A boy drags a bag of rice through a distance of 44m on a floor with a constant horizontal force of 80N. (a) What is the work done by the boy in dragging the bag? What is the work done if the boy is to exert the force 600 to the horizontal plane where the bag of rice lay?                           (5 marks)

(b) State Archimedes’ principle                                                        (2marks)

(c) List three factors affecting viscosity                                    (3marks)

  1. (a) A body at rest is given an initial uniform acceleration of 8.0ms-2 for 30 seconds after which the acceleration is reduced to 5.0ms-2 for the next 20 seconds. The body maintains the speed for 60seconds after which it is brought to rest in 20 seconds. Draw the velocity-time graph of the motion using the information given above. Using the graph, calculate the: (i) maximum speed attained during the motion; (ii) average retardation as the body is being brought to rest (iii) total distance travelled during the first 50s; (iv) average speed during the same interval as in (iii)      (8marks)

(b) State two effect of viscosity                                   (2marks)

  1. (a) A cage containing a truck of coal weighing 750kg is raised to a height of 90m in 1 minute, what is the total power expended?             (4marks)

(b) Explain the terms (i) uniform acceleration (ii) average speed          (4marks)

(c) State the principle of conservation of energy                             (2 marks)

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