Free KCSE Physics Topical Questions KNEC Standards

K.C.S.E Physics Q & A - MODEL 2005PP1QN14

13/7/2020

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K.C.S.E Physics Q & A - MODEL 2005PP1QN14

A bullet is fired horizontally from a platform 15m high. If the initial speed is 300ms^-1. Determine the maximum horizontal distance covered by the bullet.

answer

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K.C.S.E Physics Q & A - MODEL 2004PP2QN04

12/7/2020

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K.C.S.E Physics Q & A - MODEL 2004PP2QN04

a) Fig 5 shows the displacement time graph of a wave traveling at 200cm/

Determine for the wave the
i) Amplitude
ii) Period
iii) Frequency
iv) Wavelength
b) i) In the space provided below, sketch a labeled diagram to show how pinhole camera forms an image of a vertical object placed in front of the pinhole.
ii) a building standing 200m from a pinhole camera produces on the screen of the camera an image 2.5cm high 5.0cm behind the pinhole. Determine the actual height of the building

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K.C.S.E Physics Q & A - MODEL 2004PP1QN25

12/7/2020

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K.C.S.E Physics Q & A - MODEL 2004PP1QN25

A trolley is moving at a uniform speed along a track. A piece of plasticine is dropped on the trolley and sticks on it.
Explain why the trolley slows down.

answer

Plasticine increases mass of body since momentum is conserve or weight of trolley/normal reaction increases so fiction forces increases or Mass of trolley increases, the driving force being constant.

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K.C.S.E Physics Q & A - MODEL 2004PP1QN17

12/7/2020

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K.C.S.E Physics Q & A - MODEL 2004PP1QN17

The graph below shows how the velocity varies with time for a body thrown vertically upwards.

Determine the total distance moved by the body

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K.C.S.E Physics Q & A - MODEL 2003PP2QN01

12/7/2020

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K.C.S.E Physics Q & A - MODEL 2003PP2QN01

a. Fig 1 shows the displacement time graph of the motion of a particle

State the nature of the motion of the particle between:
(i) A and B (ii) B and c (iii) C and D
b) A ball is thrown horizontally from the top of a vertical tower and strikes the ground at point 50m from the bottom of the tower. Given that the height of the tower is 45m, determine the :
i) Time taken by the ball to hit the ground.
ii) The initial horizontal velocity of the ball
iii) Vertical velocity of the ball just before striking the ground. (Take acceleration due to gravity g as 10ms^-2)

ANSWERS

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K.C.S.E Physics Q & A - MODEL 2003PP1QN30

12/7/2020

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K.C.S.E Physics Q & A - MODEL 2003PP1QN30

A resultant force F acts on a body of mass m causing an acceleration a1 on the body. When the same force acts on a body of mass 2m, it causes an acceleration a2. Express a2 in terms of a.

ANSWER

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K.C.S.E Physics Q & A - MODEL 2003PP1QN22

11/7/2020

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K.C.S.E Physics Q & A - MODEL 2003PP1QN22

On the axes provided in Figure 11, sketch a graph of velocity ( V0 versus time (t) for uniformly accelerated motion given that when t = 0, v s greater than zero

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K.C.S.E Physics Q & A - MODEL 2002PP1QN14

10/7/2020

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K.C.S.E Physics Q & A - MODEL 2002PP1QN14

Fig. 9 shows a speed – time graph for the journey of a motorcar.

Determine the distance the car travels in the first 40 seconds.

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K.C.S.E Physics Q & A - MODEL 2001PP2QN06

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP2QN06

a i) State one of the Newton's law of motion
ii) A body resting on a horizontal surface is given an initial velocity V so that it slides on the surface for some distance before coming to a stop. Table I shows the distances d moved by the body of various values of u

Given that v2 is 20 (miu)d where u is a constant for the surface, plot a appropriate graph and use it to determine u.
Determine values of u on table.
b) A train of mass 200 tonnes starts from rest and accelerates uniformly at 0.5ms-2 determine its momentum after moving 100m.

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K.C.S.E Physics Q & A - MODEL 2001PP1QN14

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN14

A bullet moving at a velocity of 300ms^-1 hits a tree trunk of diameter 50cm. It emerges from the opposite side with a velocity of 150ms^-1. Determine the average deceleration of the bullet in the trunk.

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K.C.S.E Physics Q & A - MODEL 2000PP2QN02

8/7/2020

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K.C.S.E Physics Q & A - MODEL 2000PP2QN02

a) Two identical spherical steel balls are released from the top of two tall jars containing liquids L1 and L2 respectively. Fig 3 shows the velocity – time graph of the option of the balls.

Explain the nature of the curves and state why they are different.
b) In an experiment to determine the proportionality constant, μ between two wooden surfaces sliding on each other, a block of mass 2.20kg was placed on a horizontal bench. The block was then made to slide by adding mass "M" On the scale as shown in Fig 4. The experiment was repeated for other values of "m".The acceleration of the block was measured for each mass added

i) Name and indicate on figure 4 the forces acting on the 2.20kg mass.
ii) Plot the graph of acceleration, a against the mass m

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K.C.S.E Physics Q & A - MODEL 2000PP1QN20

8/7/2020

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K.C.S.E Physics Q & A - MODEL 2000PP1QN20

A body initially resting on horizontal surface is accelerated by a constant force. It passes over a small region where it experiences a force of friction equal to the accelerating force before returning to the frictionless horizontal surface. On the axes provided, sketch the velocity time graph for the motion of the body

ANSWER

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K.C.S.E Physics Q & A - MODEL 1999PP2QN03

7/7/2020

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K.C.S.E Physics Q & A - MODEL 1999PP2QN03

A tape attached to a moving trolley is run through a ticker timer. Figure 3 shows a section of the tape after running.

If the frequency of the ticker – timer is 50Hz, determine the:
i) Average velocity at intervals AB and CD.
ii) A average acceleration of the trolley.
b) A stone is released from a height, h. if the acceleration due to gravity is g, derive an expression of the velocity of the stone just before hitting the ground.
c) Figure 4 (a) shows a velocity – time graph of an object in motion.

Sketch on the axes provided in figure b4 (b0, the displacement – time graph of the Motion
(Motion upwards is taken as positive.

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K.C.S.E Physics Q & A - MODEL 1999PP1QN15

7/7/2020

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K.C.S.E Physics Q & A - MODEL 1999PP1QN15

An industrial trolley of mass 20kg carrying a mass of 50kg is acted on by a constant force. The trolley moves along a horizontal smooth surface with an acceleration of 0.5ms^-2 . Determine the acceleration of the trolley after the mass falls off.

ANSWER

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K.C.S.E Physics Q & A - MODEL 1997PP2QN03

6/7/2020

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K.C.S.E Physics Q & A - MODEL 1997PP2QN03

(a) A stone is thrown vertically upwards from the edges of a platform. Eventually the stone lands without bouncing on the ground below the platform. Taking the upward velocity to be positive sketch on the axis provided the velocity time graph of the motion of the stone.

(b) A car can be brought to rest from a speed of 20 ms-1 in a time of 2s
(i) Calculate the average deceleration
(ii) If the driver's reaction time is 0.2s, determine the shortest stopping distance

ANSWERS

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K.C.S.E Physics Q & A - MODEL 1997PP1QN27

6/7/2020

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K.C.S.E Physics Q & A - MODEL 1997PP1QN27

A trolley is moving at constant speed in a friction compensated track. Some plasticine is dropped on the trolley and sticks on it. State with a reason what is observed about the motion of the trolley.

ANSWERS

A trolley slows down/ motion decreases since mass increases and the momentum is conserved, the velocity goes down

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K.C.S.E Physics Q & A - MODEL 1996PP2QN01

5/7/2020

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(a) A accelerates uniformly from it initial velocity, u, the final velocity, v in time t. The distance traveled during this time is S. If the acceleration is denoted by the letter, a show that;
(i) V = u + at
(ii) S = ut + at²
(iii) V² = u² + as
(b) A body moving initially at 50m/s decelerates uniformly at two 2ms^-2 until it comes to rest. What distance does it cover from the time it started to decelerate

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K.C.S.E Physics Q & A - MODEL 1995PP2QN01

3/7/2020

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K.C.S.E Physics Q & A - MODEL 1995PP2QN01

The data in the table below represents the motion of vehicle over a period of 7 second

(a) plot on the grid provided, a graph of displacement ( y- axis) against time
(b) Describe the motion of the vehicle for the first 4 s
(c) Determine the velocities at 4.5s and 6.5s. Hence or otherwise determine the average acceleration of the vehicle over this time interval

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