Free KCSE Physics Topical Questions KNEC Standards

K.C.S.E Physics Q & A - MODEL 2018PP1QN16

29/7/2020

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K.C.S.E Physics Q & A - MODEL 2018PP1QN16

(a) An electric crane uses 8.0 x10⁴ N of energy to lift a load of 2.0 X 10⁴N in 4s.
(i) Determine the;
I power developed by the crane,
II height to which the load is lifted,
III efficiency of the crane whose motor is rated 2.5 X 10⁴ W.
(ii) State two forms of energy transformation that lead to the crane’s inefficiency.
(b) A stone is dropped from the top of a building to the ground. On the axes provided, sketch a graph of potential energy against time for the stone.

answers

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K.C.S.E Physics Q & A - MODEL 2016PP1QN16

27/7/2020

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K.C.S.E Physics Q & A - MODEL 2016PP1QN16

(a)Define the term velocity ratio of a machine.
(b) Fig. 12 shows part of a hydraulic press. The plunger is the position where effort is applied while the Ram piston is the position where load is applied. The plunger has cross-section area, a m² while the Ram piston has cross-section area, A m².

When the plunger moves down a distance d the Ram piston moves up a distance D.
Derive an impression for the velocity ratio (V.R) in terms of A and a
c) A machine of velocity ratio 45, overcomes a load of 4.5 x 10³N when an effort of 135N is applied. Determine:
(i)The mechanical advantage of the machine;
(ii) Efficiency of the machine;
(iii) The percentage of the work that goes to waste.

answers

(a)It is the ratio of distance moved by effort to distance moved by load

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K.C.S.E Physics Q & A - MODEL 2015PP1QN15

24/7/2020

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K.C.S.E Physics Q & A - MODEL 2015PP1QN15

(a) Figure 8 shows a 200 g mass placed on a frictionless surface and attached to a spring.

The spring is compressed and released. Given that the elastic potential energy of the compressed spring is 2.7 X 10^-2 J, determine the maximum speed with which the block moves after it is released.
(b) In a wheel and axle system, state the advantage of having a large wheel diameter compared to the axle diameter for a frictionless system.
(c) A body is released from a height h. Sketch a graph of potential energy against kinetic energy as the body falls to the ground.
(d) Figure 9 shows a hydraulic lift system. The radius of the small piston is 3 cm while that of the larger piston is 9 cm. A force of 90 N is applied to the smaller piston.

Determine the:
(i) maximum load that can be lifted.
(ii) efficiency of the system.

answers

(b)(b) Reduces the effort required to raise the 1oad (increases the mechanical advantage.)

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K.C.S.E Physics Q & A - MODEL 2014PP1QN16

23/7/2020

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K.C.S.E Physics Q & A - MODEL 2014PP1QN16

Figure 10 shows a trolley of weight 20 N pulled by a force of 4 N from the bottom to the top of an inclined plane at a uniform speed.

(a) (i) State the value of the force acting downwards along the inclined plane.
(ii) Explain how the value in part (a) (i) is obtained.
(b) For the system. determine the:
(i) mechanical advantage;
(ii) velocity ratio;
(iii) efficiency.

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K.C.S.E Physics Q & A - MODEL 2013PP1QN16

22/7/2020

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K.C.S.E Physics Q & A - MODEL 2013PP1QN16

(a) A horizontal force of 12 N is applied on a wooden block of mass 2 kg placed on a horizontal surface. It causes the block to accelerate at 5 m/s2. Determine the frictional force between the block and the surface. (3 marks)
(b) Figure 9 shows a graph of velocity against time for a ball bearing released at the surface of viscous liquid.

Explain the motion of the ball bearing for parts
(I) OA
(ii) AB
(c) Figure 10 shows a pulley system used to raise a load by applying an effort of 500 N.

State the:
(i) velocity ratio of the system.
(ii) purpose of pulley 2.
(iii) Given that the machine has an efficiency of 80%, determine the maximum load that can be raised.

answers

(b) (I) OA - the ball bearing decelerates; as the upthrust increases to a maximum;
AB - baIl attains terminal velocity; when upthrust = weight;

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FORM I - PHYSICS SYLLABUS

Introduction to Physics (4 Lessons)
Measurements 1 (12 Lessons)
Force (16 Lessons)
Pressure (24 Lessons)
Particulate Nature of Matter (12 Lessons)
Thermal Expansion (12 Lessons)
Heat Transfer
Rectilinear Propagation of Light and Reflection at Plane Surface (16 Lessons)
Electrostatics (12 Lessons)
Cells and Simple Circuits (12 Lessons)

FORM II - PHYSICS SYLLABUS

Magnetism (12 Lessons)
Measurements II (16 Lessons)
Turning Effect of Force (10 Lessons)
Equilibrium Centre of Gravity (12 Lessons)
Reflection at Curved Surfaces (16 Lessons)
Magnetic Effect of Electric Current (18 Lessons)
Hooke's Law (8 Lessons)
Waves (14 Lessons)
Sound (12 Lessons)
Fluid Flow (14 Lessons)

FORM III - PHYSICS SYLLABUS

Linear Motion (20 Lessons)
Refraction of Light (20 Lessons)
Laws of Motion (15 Lessons)
Energy, Power and Machines (20 Lessons)
Current Electricity (20 Lessons)
Waves II(10 Lessons)
Electrostatics II (15 Lessons)
Heating Effect of Electric Current (10 Lessons)
Quantity of Heat (20 Lessons)
Gas Laws (15 Lessons)

FORM IV - PHYSICS SYLLABUS

Thin Lenses (20 Lessons)
Uniform Circular Motion (10 Lessons)
Floating and Sinking (15 Lessons)
Electromagnetic Spectrum (15 Lessons)
Electromagnetic Induction (20 Lessons)
Mains Electricity (10 Lessons)
Cathode Rays and Cathode Ray Tube (10 Lessons)
X-rays (8 Lessons)
Photoelectric Effect (15 Lessons)
Radioactivity (15 Lessons)
Electronics (10 Lessons)

K.C.S.E Physics Q & A - MODEL 2018PP1QN16

K.C.S.E Physics Q & A - MODEL 2018PP1QN16

K.C.S.E Physics Q & A - MODEL 2016PP1QN16

K.C.S.E Physics Q & A - MODEL 2016PP1QN16

(a)Define the term velocity ratio of a machine.
(b) Fig. 12 shows part of a hydraulic press. The plunger is the position where effort is applied while the Ram piston is the position where load is applied. The plunger has cross-section area, a m² while the Ram piston has cross-section area, A m².

K.C.S.E Physics Q & A - MODEL 2015PP1QN15

K.C.S.E Physics Q & A - MODEL 2015PP1QN15

K.C.S.E Physics Q & A - MODEL 2014PP1QN16

K.C.S.E Physics Q & A - MODEL 2014PP1QN16

K.C.S.E Physics Q & A - MODEL 2013PP1QN16

K.C.S.E Physics Q & A - MODEL 2013PP1QN16

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K.C.S.E Physics Q & A - MODEL 2018PP1QN16

K.C.S.E Physics Q & A - MODEL 2018PP1QN16

K.C.S.E Physics Q & A - MODEL 2016PP1QN16

K.C.S.E Physics Q & A - MODEL 2016PP1QN16

(a)Define the term velocity ratio of a machine. (b) Fig. 12 shows part of a hydraulic press. The plunger is the position where effort is applied while the Ram piston is the position where load is applied. The plunger has cross-section area, a m2 while the Ram piston has cross-section area, A m2.

K.C.S.E Physics Q & A - MODEL 2015PP1QN15

K.C.S.E Physics Q & A - MODEL 2015PP1QN15

K.C.S.E Physics Q & A - MODEL 2014PP1QN16

K.C.S.E Physics Q & A - MODEL 2014PP1QN16

K.C.S.E Physics Q & A - MODEL 2013PP1QN16

K.C.S.E Physics Q & A - MODEL 2013PP1QN16

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FORM I - PHYSICS SYLLABUS

FORM II - PHYSICS SYLLABUS

FORM III - PHYSICS SYLLABUS

FORM IV - PHYSICS SYLLABUS

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(a)Define the term velocity ratio of a machine.
(b) Fig. 12 shows part of a hydraulic press. The plunger is the position where effort is applied while the Ram piston is the position where load is applied. The plunger has cross-section area, a m² while the Ram piston has cross-section area, A m².