Physics obj
1-10 CEABCBAABB
11-20 DCCBCBCCAE
21-30 BECDDBEDDE
31-40 DBAEADBABA
41-50 CBDCBBBDCB
51-60 CEDDCBAEAA
1a) i) The body tube
ii) The launch jug
ii) The fins
iv) The engine holder
V) The nose cone
Vi) The recovery device
b) i) Telepresence
ii) Broadcasting
iii) Tele communication
iv) internet and multimedia
4) The specific latent heat of vaporization of a substance is the quantity of heat required to change unit mass of the substance from its liquid at the boiling point to vapour without a change in temperature
ii) potential energy is simply stored energy or the energy possessed by a body by virtue of its position while
Kinetic energy is the energy possesed by a body by virtue of its motion
3) The examples of stable equilibrium are :
a) a cone resting on its base
b) a racing car with low centre of gravity and wide base
Examples of neutral equilibrium are;
a) a cone or cylinder or an egg resting on its side
b) a ball on a smooth horizontal table
II) a ship is able to float because it is designed to displace a large volume of water, thus providing a big upthrust.
5) a. Sun
b. Wind
II) M1U1 + M2U2 = (M1 + M2) V
M1 = 15kg, M2= 5kg u1=10m/s u2=0 v=?
Momentum before = momentum after
15×10 +5×0 = (15 +5)v
150 + 0 = 20v
150 = 20v
V=7.5m/s
6) Wave front is defined as a line or surface in the path of an advancing wave on which all the particles are in the same phase or state of disturbance
ii) a) transverse wave
b) longitudinal wave
7a)
*Pupil eye*
It’s actually a hole, and the light that passes through the lens is absorbed by the tissues in the back of the eye giving the pupil it’s black look. … The pupillary reflex is the involuntary reflex that regulates the dilation and constriction of the pupil and the amount of light that enters.
7ii)
shutter is a device that allows light
to pass for a determined period, exposing
photographic film or a light-sensitive electronic
sensor to light in order to capture a permanent
image of a scene. A shutter can also be used to
allow pulses of light to pass outwards, as seen in a
movie projector or a signal lamp . A shutter of
variable speed is used to control exposure time of
the film. The shutter is so constructed that it
automatically closes after a certain required time
interval. The speed of the shutter is controlled by a
ring outside the camera, on which various timings
are marked.
*PART B*
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1ai)- The body tube
– The launch lug
1aii) Broadcasting: This involves mainly television broadcast
– Internet and multimedia: This involves communication and exchange of information through the internet
1b)
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3a)-Book lying on table
-A car engine that keeps running for a constant for a considerable length of time
3aii)
-Rolling ball
-Pendulum ball
3b) Ship floats in water,although they are made of steel and iron which are materials denser than water. This Is because the ship is hollow I.e an open object.
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4a. Specific latent heat of vaporization ( L ) of a substance is the quantity of heat required to change unit mass of the substance from it’s liquid at boiling point to vapor without a change in temperature.
4b. – Kinetic energy is the energy due to motion while potential energy is the energy at rest due to it’s level or position.
– kinetic energy is an horizontal energy while potential energy is a vertical energy.
– Kinetic energy is denoted by k.E while potential energy is denoted by P.E.
– Kinetic energy does not act against gravity while potential energy acts against gravity.
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6a. Wave front is a line or surface in the path of advancing wave on which all d particles are in the same phase or state of disturbance.
6b.-Plane wave front
– Spherical or circular wave front.
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7i)- Pupil:The pupil serves as the passage for light into the eye
ii)- Shutter:The Shutter works on the stimulation of light before photograph can be taken
III) Screen of pinhole camera: Ihelps to form images which are inverted
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*PART II*
12ai) Newton’s second law of motion states that the rate of change of momentum is proportional to the impressed fotvr and takes place in the direction of the force
12aii)- The motion of the strings in a musical instrument eg. Guitar
– The motion of the balance wheel of a watch
12bi) Resultant force is that single force which acting alone will have the same effect in magnitude and direction as two or more forces acting together
12bii) Equilbrum force is that single force which will balance all the other forces taken together. It is equal in magnitude buy opposite in direction to the resultant force
12c)
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13ai)- Solar energy is for providing a cheap and clean source of hot water supply.
– Solar energy provides electricity supply
13aii)-Renewable energy are those that can be replaced as they are used up. They can be continually replenished as they are exploited and utilized while Non-Renewable energy are those that cannot be replenished as they are used up
-Examples of renewable energy are Solar energy, wind energy, Biomass and Bio feuls while examples of Non renewable energy are Coal and wood, Fossil fuel, Petroleum and Natural gas, Nuclear energy
13b) The principle of conservation of linear momentum us also utilized in the propulsion of jet aircraft. Gases are burnt within the combustion chambers of the engine. As jets of hot gases are expelled downwards through the tail nozzle at very high speeds from the aircraft, an equal and opposite momentum is given to the rocket or aircraft which then moves
13c)
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1ai)- The body tube
– The launch lug
1aii) Broadcasting: This involves mainly television broadcast
– Internet and multimedia: This involves communication and exchange of information through the internet
1b)
=
==========≠=============
=======================
=====
3a)-Book lying on table
-A car engine that keeps running for a constant for a considerable length of time
3aii)
-Rolling ball
-Pendulum ball
3b) Ship floats in water,although they are made of steel and iron which are materials denser than water. This Is because the ship is hollow I.e an open object.
==========≠=============
=================
4a. Specific latent heat of vaporization ( L ) of a substance is the quantity of heat required to change unit mass of the substance from it’s liquid at boiling point to vapor without a change in temperature.
4b. – Kinetic energy is the energy due to motion while potential energy is the energy at rest due to it’s level or position.
– kinetic energy is an horizontal energy while potential energy is a vertical energy.
– Kinetic energy is denoted by k.E while potential energy is denoted by P.E.
– Kinetic energy does not act against gravity while potential energy acts against gravity.
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5) a. Sun
b. Wind
II) M1U1 + M2U2 = (M1 + M2) V
M1 = 15kg, M2= 5kg u1=10m/s u2=0 v=?
Momentum before = momentum after
15×10 +5×0 = (15 +5)v
150 + 0 = 20v
150 = 20v
V=7.5m/s
6a. Wave front is a line or surface in the path of advancing wave on which all d particles are in the same phase or state of disturbance.
6b.-Plane wave front
– Spherical or circular wave front.
=
==========≠=============
=======================
======================
7i)- Pupil:The pupil serves as the passage for light into the eye
ii)- Shutter:The Shutter works on the stimulation of light before photograph can be taken
III) Screen of pinhole camera: Ihelps to form images which are inve
*PART II*
12ai) Newton’s second law of motion states that the rate of change of momentum is proportional to the impressed fotvr and takes place in the direction of the force
12aii)- The motion of the strings in a musical instrument eg. Guitar
– The motion of the balance wheel of a watch
12bi) Resultant force is that single force which acting alone will have the same effect in magnitude and direction as two or more forces acting together
12bii) Equilbrum force is that single force which will balance all the other forces taken together. It is equal in magnitude buy opposite in direction to the resultant force
13ai)- Solar energy is for providing a cheap and clean source of hot water supply.
– Solar energy provides electricity supply
13aii)-Renewable energy are those that can be replaced as they are used up. They can be continually replenished as they are exploited and utilized while Non-Renewable energy are those that cannot be replenished as they are used up
-Examples of renewable energy are Solar energy, wind energy, Biomass and Bio feuls while examples of Non renewable energy are Coal and wood, Fossil fuel, Petroleum and Natural gas, Nuclear energy
13b) The principle of conservation of linear momentum us also utilized in the propulsion of jet aircraft. Gases are burnt within the combustion chambers of the engine. As jets of hot gases are expelled downwards through the tail nozzle at very high speeds from the aircraft, an equal and opposite momentum is given to the rocket or aircraft which then moves
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