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Kansbag Physics Paper 1 Questions. Question Paper

Kansbag Physics Paper 1 Questions.

Course:Secondary Level

Exam Year:2009

Name Admission Number Class

232/1
PHYSICS
Paper 1
Theory
2 hours

KANSBAG PROJECTIONS FORM FOUR TERM 1 EXAMINATION 2009
Kenya Certificate of Secondary Education
PHYSICS
Paper 1
Theory
2 hours

Instructions
? Answer ALL question in the spaces provide
? Mathematical table / electronic calculators may be used
? All working MUST be clearly shown where necessary

For Examiner’s Use Only
Section Question Maximum Score Candidate’s Score
A 1 – 13 25
B 14 11
15 12
16 11
17 12
18 9

SECTION A (25 Marks)
Answer ALL the questions in this section in the spaces provided.
1) In an experiment to estimate the height of a tree a form 1 student measured the length of the shadow of a metre rule and got 84cm. He then measured the length of the shadow of the tree and got 960cm what was the height of the tree? (3mks)

2) Differentiate between a scalar and rector quantity and give one example of each. (3mks)

3) The surface area of the body of a lizard exposed to the atmosphere is 40cm2. If the atmospheric pressure at the place is 1x105 Pa, calculate the force acting on it. (3mks)

4) State the effect of increase in temperature on Brownian motion. (1mk)

5) State one special feature in a clinical thermometer that makes it sensitive. (1mk)

6) State two factors that affect the conductivity of the metal. (2mks)

7) Give one reason why houses constructed using clay bricks and cement are more likely to crack than those constructed using stone and cement. (1mk)

8) Explain why two thin blankets are warmer than a single thick one. (1mk)

9) Sketch a diagram of a micrometer screw gauge showing a reading of 12.08mm. (2mks)

10) Figure 1 shows a claw hammer being used to extract a nail.

Given that the force applied F is 250N. Calculate the moment of this force. (3mks)

11) Figure 2 shows an acrobat balancing on one leg.

Name the state of equilibrium he is in. (1mk)

12) Figure 3 shows a horizontal tube of varying cross-section connected to a U-tube containing mercury. Complete the diagram to show the mercury level in the U-tube when a stream of air is blown through the horizontal pipe. (2mks)

13) Figure 4 shows a pulley system used to lift a 10kg mass.

Given that the efficiency of the machine is 75% calculate the effort E. (3mks)

SECTION B (55 Marks)
Answer ALL the questions in this section in the spaces provided.
14) a) State Hook’s law. (1mk)

b) Figure 5 shows a set up used by a form 2 girl to study the relationship between the compression of a spiral spring and the compression force.

She measured the length of the spring L, for different weights W (N) placed on the spring. She then plotted her results on a graph as shown;
From the graph find the:
i) Length of the spring when not loaded. (1mk)

ii) The spring constant of the spring. (3mks)

iii) The minimum force that will make the spring coils touch. (1mk)

c) A screw jack has a screw pitch of 5mm and the effort applied at the end of the effort arm moves a distance of 1m for one turn. It needs an effort of 30N to lift a load of 750N. The screw jack is shown in figure 6.

Calculate:
I) The M.A of the screw jack. (3mks)

II) The V.R of the screw jack (3mks)

III) The efficiency of the screw jack. (3mks)

15) a) The velocity-time graph in figure 7 represent the motion a ball which has been projected vertically upwards from the surface of the moon. The weight of the body on the earth is 2N.
i) State why the velocity becomes negative after 3 seconds. (1mk)

ii) Calculate the gravitational acceleration on the moon. (3mks)

iii) Calculate the total distance travelled by the ball in the first 5 seconds. (3mks)

iv) Determine the weight of the ball on the moon. (2mks)

b) A body starts from rest and accelerates at 2m/s2 for time of 6 seconds. Calculate:
i) Its final velocity. (2mks)

ii) The total distance travelled. (2mks)

16) a) State Newton’s second law of motion. (1mk)

b) Figure 8 below shows a section of a ticker tape the dots were made at a frequency of 50HZ.
Determine the acceleration of the body from the tape. (6mks)

c) A stationary gun of mass 50tonne fires a shell of mass 100kg with a velocity of 600m/s. Calculate the initial recoil velocity of the gun. (3mks)

17) a) Figure 9 shows a solar heating system that can be mounted on a slopping roof to produce warm water which is stored in a tank.

i) Give a reason why the water tank is placed at a higher level than the unit. (1mk)

ii) Why is the tubing made of thin copper tubes? (2mks)

iii) How does the black colour increase the efficiency of the system? (2mks)

iv) State two possible ways in which heat energy is lost from the water tank. (2mks)

b) A well lagged calorimeter contains 0.10kg of water and has an electric heater immersed in it. A second identical lagged calorimeter contains 0.10kg of paraffin and an identical heater. Both liquids are at a temperature of 30oC. The heaters are switched on at the same time. The paraffin reaches a temperature of 50oC in 20minutes. Calculate the time the water takes to reach this temperature. (4mks)

18) a) A quantity of argon gas occupies a volume of 2x10-3 m inside a high pressure container. The pressure of the argon is 1.5x107 Pa when the temperature is 10oC. Calculate the volume of the argon when used to inflate a balloon to a pressure of 1x105 Pa at a temperature of 23oC. (3mks)

b) i) Some results of an experiment o study the effect of temperature on a man of a gas at constant pressure are shown in the table.
Volume (cm) 20 25 40
Temperature (oC) 0 136 205

Complete the table by filling in the missing values. (8mks)

ii) Plot a graph of volume (y-axis) against the temperature. (5mks)

Kansbag Physics Paper 1 Questions. Question Paper

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