🌊PAPER 33-Qns

 

FEZA BOYS SECONDARY SCHOOL

PHYSICS

TERMINAL EXAMINATION FORM IIISci1&2

TIME: 3 HOURS DATE: 12/06/2010

INSTRUCTIONS:

1. This paper consists of three sections A,B and C

2. Answer ALL question from sections A and B and only ONE (1) question form section C

3. In your calculations you may use the following constant.

• acceleration due to gravity, g=10m/s²

• pie=22/7.

SECTION A: (30 marks)

Answer ALL questions from this section.

1. Answer all questions by choosing the correct letter of the correct item.

(i) A floating body experiences an upthrust which is equal in magnitude to the;

1. Weight of fluid displaced.

2. Volume of fluid displaced

3. Density of fluid displaced

4. Density of the floating body

5. None of the above.

(ii) A wheel and axle of efficiency 75% is used to raise a load of 1500N. if the radii of the wheel is 40cm and axle is 4cm, then the effort required to overcome the load is

1. 150N

2. 200N

3. 2000N

4. 1500N

5. 20000N

(iii) A zig-zag path traveled by electrons from a negatively charged cloud towards a positively charged one is called.

1. Thunder

2. Lighting

3. Field emission

4. Rainbow

5. Radar

(iv) Racing cars rarely get accidents despite of their high speed because they :

1. Have greater momentum

2. Have big tyres with big treads

3. Have wide bases and low centre of gravity,

4. Exert greater frictional force

5. Have less mass.

(v) Refractive index of a glass cannot be evaluated from the following ratio

1. sini to sinr

2. Velocity of light in air to velocity of light in glass

3. Real depth to apparent depth.

4. Wavelength of light in air to that in glass.

5. Reciprocal of refractive index from air into glass.

(vi) A blue shirt with red spots when viewed in blue light will appear

1. Completely red

2. Completely cyan

3. Blue with red spots

4. Cyan with blue spot

5. Blue with black spots

(vii)The leaves of a negatively charged electroscope diverge when a charged body is brought near it. Therefore the body must have been.

1. Positively charged

2. Negatively charged

3. A good conductor

4. A good insulator

5. A piece of iron

(viii) A car moves from rest for 10 seconds with a uniform acceleration of 0.5m/s²? In this time it covers a distance of:-

1. 25m

2. 50m

3. 75m

4. 100m

5. 125m

(ix) In a machine, the efficiency is less than 100% in practice. This is because

1. The velocity ratio is greater than the Mechanical advantage.

2. The Mechanical advantage is greater than one

3. The efficiency does not depend on velocity ratio.

4. The velocity ratio depends an mechanical advantages

5. Work put to the machine equals to work done by the machine.

(x)A body weight 3.6N in air and 2.4N when fully immersed in water, the density of the body in g/cm3 is

1. 1.4

2. 2.0

3. 3.0

4. 0.8

5. 2.4

Qns	i	ii	iii	iv	v	vi	vii	viii	ix	x
Ans

2. Match the items in List A with the responses in List B by writing the letter of the correct answer:

LIST A

LIST B

The angle which the suspended magnet makes with the horizontal Voltmeter Elasticity Rheostat Long sightedness Renewable source of thermal energy Complimentary colors. Newton Block and tackle pulley system Plano concave

Fossil fuel Kgm/s Angle of declination Geothermal energy Pair of colors mixed to form white color Connected in series in the circuit Converging lens Nm/s V.R. equals the number of pulleys. Connected in parallel in the circuit Long eye-ball Angle of inclination Variable resistor Pair of colors mixed to form secondary colors Plasticity Diverging lens Short eye-ball Efficiency is 100% Return to its original shape and size Resistor

LIST A	i	ii	iii	iv	v	vi	vii	viii	ix	x
LIST B

3.(a)Fill in the blanks

1. Thermal energy of a body increases with increase in ________________________

2. __________________________ fuels are derived from the remains of animals are plants died many years ago.

3. __________________________ is a non-polluting source of thermal energy.

(b)

Friction force depends on ______________________ and ___________________________ and is independent of ______________________________ .

(c)A concave lens always produce a ___________________, ______________________ and_____________________ image while an eye produce an image which is ___________________ in size.

SECTION B: (60 Marks)

Answer ALL questions from this section

4. (a) State Newton’s second law of motion.(01mark)

(b) ‘’A stone thrown vertically upwards away from the ground will finally turn back to the ground’’. Describe what happened over its velocity(02marks)

( c) A car accelerates uniformly from rest for 20 seconds with an acceleration of 1.5m/s².It then travels at constant speed for 2 minutes before slowing down with a uniform deceleration to come to rest in a further 10 seconds.Sketch a velocity-time graph of the motion. From the graph: Find:-

1. The maximum speed.(02 marks)

2. The total distance traveled(01 mark)

3. The acceleration while slowing down(04 marks)

5. (a) How do the following differ

1. Principal focus and focal length(02 marks)

2. Concave lens and convex lens.(02 marks)

(b) What is a real image?(01 mark)

An object 4cm high is located 20cm in front of a thin lens of focal length – 5cm.Calculate

1. The image distance.

2. The linear magnification (05 marks)

3. The height of the image.

6.(a) (i) Define the centre of gravity of a body(02 marks)

(ii) State the principle of moment,(02 marks)

(b) A uniform wooden bar, AB of length 120cm and weighing 1.20N rests on two sharp edged supports C and D placed 10cm from each end of the bar respectively. A 0.20N weight hangs from a loop of thread 30cm from A and a 0.90N weight hangs similarly 40cm from B. Find the reactions at the supports.(06 marks)

7. (a) (i)State Archimedes Principle.(01 mark)

(ii) Mention two applications of the law of flotation.(01mark)

(b) (i)Draw a well labeled diagram of a hydrometer.(02 marks)

(ii) Give two uses of hydrometer.(02 marks)

(c ) The mass of a piece of cork of density 0.25g/cm is 20g. What fraction of the cork is immersed when it floats in water? (Density of water =1g /cm).(05 marks)

8. (a) Describe the energy charges which takes place when

1. A simple pendulum oscillates.(01 mark)

2. A bow is used to shoot an arrow.(01 mark)

(b) Using Newton’s second law of motion, state two quantities which vary with net force applied on a body.

(c) A certain force gives mass m1 an acceleration of 12.0m/s. What acceleration will the same force give the two m1 masses when they are joined together? (06 marks)

9. (a) A and B in the figure below are two convex lenses correctly set up as a telescope to view a distant object as shown by the figure. One lens has a focal length of 5cm and the other of 100cm.

1. What is A called and what is its focal length?(01mark)

2. How far from A is the first image of the distant object?(02marks)

3. What is the name of B?(01mark)

4. What acts as the ‘object’ for B and how far must B be from it if someone looking through the telescope is to see the final image at the same distance as the distant object?(02marks)

5. What is the distance between A and B with the telescope set up in (iv) above?(02marks)

(b) For a simple microscope, where should the object be placed in order to be magnified?(02marks).

SECTION C : (10 marks)

Answers only ONE (1) question from this section

10. (a)Mention three optical Instruments which make use of lenses only.(03 marks)

(b) (i)What is meant by a simple microscope or magnifying glass?(01mark)

(ii) What is the value of the shortest image distance of distinct vision for simple microscope?(01mark)

( c) A small object is placed 6cm from the lens of a simple microscope. If the focal length of the lens is 18cm

1. Find the linear magnification produced by the simple microscope. (02marks)

2. What is the distance from the lens to the object, in order to obtain maximum magnification of the image? (03 marks)

11. (a)(i)State Ohm’s law .(01mark)

(ii)Describe the factors affecting resistance.(02marks)

(b) Three cells each of emf 1.5V and internal resistance 0.6 ohm are joined in series to form a battery and connected across a 5 ohm resistor. Calculate:

1. the current(02marks)

2. the p.d. between the terminals of the battery.(02marks)

( c) (i)Define the resistivity of a given conductor.(01mark)

(ii)A conductor of length 11m and diameter of 0.2cm has a resistance of 14Ω.Calculate the resistivity of the conductor.(02marks)

The End|Get a Copy