🌊PAPER 12~Qns

 

MARKAZ ISLAMIC SEMINARY

FORM THREE MID-TERM TEST

PHYSICS-031

April, 2024-Time: 3:00 Hours

INSTRUCTIONS

1. This paper consists of sections A, B and C with a total of eleven (11) questions.

2. Answer all questions in section A and B and two questions from section C

3. Section A carries sixteen (16 marks), Section B carries fifty four (54 marks) and section C carries thirty (30 Marks).

4. Non-programmable calculators and mathematical tables may be used.

5. Write your full name on every page of your answer booklets

6. Where necessary the following constants may be used;

• Acceleration due to gravity(g=1Om/s²)

• Pier=3.14

SECTION A (16 Marks)

Answer all questions in this section

1. For each of the items (i) –(x), Choose the correct answer from among the given alternatives and write its letter beside the item number in the answer booklet provided.

1. The irregular motion of tiny particles suspended in a fluid is called;

1. Mobility

2. Kinetic motion

3. Random motion

4. Brownian motion.

5. Irregular motion

2. Which of the following burning medium requires a carbon dioxide extinguisher?

   1. Organic solids

   2. Flammable liquids and greases

   3. Flammable gases

   4. Combustible metals

   5. Electrical hazards

3. The initial volume of a liquid in a burette was 57cm³. If X cm³ of the liquid was poured out of the burette and final volume of the liquid remaining was 23 cm³, calculate the value of X

   1. 80 cm³

   2. 50 cm³

   3. 34 cm³

   4. 46 cm³

   5. -46 cm³

4. Classify the force experienced when a metal solid or a hard object is twisted.

   1. Compression

   2. Stretching

   3. Restoring

   4. Torsion

   5. Friction

5. Calculate the relative density of an object that weighs 3.5 N when in air and 2.8 N when fully immersed in water.

   1. 0.8

   2. 6.4

   3. 5.0

   4. 0.22

   5. 3.5

6. Why can water striders and pond skaters walk on water without sinking?

   1. Because of the process of osmosis

   2. Because of the property of capillarity

   3. Because of the presence of impurities in water

   4. Because of the force of surface tension

   5. Because of the force of cohesion and adhesion.

7. Identify the statement that describe the Pascal’s principle of transmission of pressure in fluids.

   1. Pressure is equally transmitted in liquid

   2. Pressure depends on the height of the liquid column

   3. Pressure is the ratio of force to area

   4. Pressure is affected by the force of gravity

   5. Pressure produces upthrust

8. Suppose an engine raises 200 kg of water steadily through a height of 60 m in 20 sec. The upward force used is equal of the

weight of water raised. Calculate the power in kW

1. 6 kW

2. 3 kW

3. 5 kW

4. 7 kW

5. 4 Kw

9. The following statement about magnetic lines of force are correct except?

   1. Always form close loops

   2. Start at north pole and end at the south pole

   3. Cross one another

   4. Stronger where the lines are closer together

   5. Pass through all materials, both magnetic and non-magnetic.

10. What is the distance and displacement covered by an athlete who runs 100 m to the North, 70 m to the East, 100 m to the South and 70 m to the West to complete the race?

    1. Distance is 0 m and displacement is 340 m

    2. Distance is 340 m and displacement is 0 m

    3. Distance is 340 m and displacement is 340 m

    4. Distance is 0 m and displacement is 0 m

    5. Distance is 700 m and displacement is 700 m

2. Match the properties of functions of the simple machines in List A with their corresponding names of the machines in List B by writing the letter of the correct response besides the corresponding item number in the answer booklet provided.

List A	List B
Is useful in drawing water from a borehole Applies the principle of first class lever Its velocity ratio increases by increasing the length of ramp The effort is between the load and fulcrum Operates based on the principle of transmission of pressure in fluids Carries objects from one points to another horizontally.	Wheelbarrow Wheel and axle Hydraulic press Tong Claw hammer Inclined plane Pulley Windmill Screw jack

SECTION B (54 Marks)

Answer all questions in this section

3.

1. A convex mirror is often used as the wing mirror of a car instead of plane mirror. Justify this statement giving one point.

2. The angle of minimum deviation for a prism is 37⁰. If the angle of the prism is 60⁰, find the refractive index of the material of the prism.

4.

1. Why is it not be practical to make a barometer with water instead of mercury?

2. A force 0f 200 N and 20 cm long spanner and 150 N and 30 cm long spanner were separately used to loosen the left and right front car tire, respectively. Show that the 30 cm long spanner will be more effective than the 20 cm long spanner.

5.

1. Why while swimming, the swimmer pushes the backward with his hands?

2. Figure I show two simple machine A and B having the same efficiency. Justify that simple machine A requires minimum effort to raise a load of 5000 N.

6. A vehicle moves from rest with a uniform acceleration of 1.5m/𝑠𝑠² for the first 10s and continues accelerating at 0.5m/𝑠𝑠² for a further 20s. It continues at constant speed for 90s and finally takes 30s to decelerate uniformly to rest.

   1. Draw a graph of speed against time for the journey.

   2. From your graph, deduce the total distance travelled.

   3. What is the average speed of the train for the whole journey?

6. A river is flowing at a velocity of 2m/s due south. A person in a boat wants to move across the river at 10m/s.

1. In which direction should the person move?

2. At what velocity should the person move the boat?

3. State the vector additional law you have used in (i) above

6. You, as a student studying physics, have been invited to a scientific exhibition conference and you are required to present a topic on friction.

1. Mention two of its advantages

2. Mention two of its disadvantages

3. Mention two ways of increasing it

4. Mention two ways of decreasing it

5. Mention one fundamental cause of its nature

SECTION C (30 MARKS)

9.

1. Quantities in physics can be classified as scalar or vector quantities. By giving three examples in each one differentiate between the two quantities.

(b)

1. Mention laws that are used to operate the vector quantities in (a) above.

2. Use the law you have stated in (b)(i) to find the resultant of two forces of magnitudes 50N and 70N acting at a point making an angle of 45⁰ between them.

10.

(a) A swimming pool appears to be 1.5m deep. The refractive index of water is 1.3.

1. Determine the real depth of the pool.

2. Explain why the pool appears shallower than its actual depth.

2. White light can be dispersed to form various colours

1. Mention the colours which are formed in the above phenomenon

2. Mention three examples of the phenomenon above in our daily life

(iii)Mention two methods which can reverse the phenomenon above

11.

(a) An object 25cm high is placed 60cm away from a convex mirror of radius of curvature 30cm.

1. Determine the characteristics of the image formed by both using the mirror formula and drawing a suitable ray diagram

2. Comment on the discrepancy between the values obtained by the two methods above.

(b) You are invited to a wedding ceremony that is taking place in a hall with more than one color light source. Your dress color is yellow with blue spots, explain the appearance of your dress when

1. White light is on

2. Red light is on

3. Green light is on

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