CHILDREN & YOUTH DEVELOPMENT INITIATIVE CENTRE (CYDIC) PRE-NATIONAL EXAMINATION PHYSICS
CHILDREN & YOUTH DEVELOPMENT
INITIATIVE CENTRE (CYDIC)
PRE-NATIONAL
EXAMINATION
0031/1 PHYSICS 1
Instructions:
(i)
This paper consists of THREE (3) sections: A, B and C.
(ii)
Attempt ALL question in sections A and B and one question
from section C
(iii)
All examination roles must be maintained (observed).
(iv)
Where necessary the following constant may be used
Ø Density of water= 1g/cm3
or 1000kg/m3
Ø Acceleration due to gravity,
s2
Education is not
received, It is achieved..
SECTION
A (20 Marks)
Answer
all questions from this section
1. The following items (i) – (x) are multiple-choice
questions. Choose the correct answer and
write It’s letter beside the Item in ANSWER SHEET provided.
(i)
Increase or decrease of the level of sea water
is known as ocean tides. This is caused mainly by the gravitational force of
the
(a)
Moon on the sun (d) sun on the moon
(b)
Earth on the moon (e) moon on the earth
(c)
Moon on the sea (f)
sun on the earth
(ii)
When using measuring cylinder to measure volume
of water, the reading is to be taken at the
(a)
Upper meniscus line (d) lower level
(b)
Lower meniscus line (e) lower line
(c)
Upper level (f)
upper line
(iii)
A person with fever feels cold despite the fact
that his/her body is hot. This is due to
(a)
Cold environment
(b)
Heat transfer from the body to the surrounding
(c)
Heat transfer from the surroundings to the body.
(d)
Heat exchange between the body and the
surrounding.
(e)
High heat capacity of the body
(f)
Low heat capacity of the body
(iv)
During the rainy season we usually see the light
of the thunder before hearing its sound. This is because
(a)
The eyes are sensitive than ears (d) sound undergo
multiple reflection
(b)
Light is visible while sound is not (e) lights is reflected by the
clouds
(c)
Light travel faster than sound (f) light is produced first
(V) Most of the road safety
symbols are painted in red. This is because red
(a). Is the most shining color (d) shows
danger
(b)
Is the most sensitive to the eyes. (e)
Has shorter wavelength
(c)
Is more attractive to most people. (f)
Is most recommended
(vi) High speed in passenger bus has been
a major cause of road accidents in Tanzania. How are the racing cars
constructed in order to avoid accidents to high speed?
(a)
With great moment and wide base
(b)
With big tires and big treads
(c)
With wide base and low centre of gravity
(d)
To exert greater frictional force on the ground.
(e)
With less mass but greater momentum.
(f)
With wide base and high centre of gravity
(vii). Unlike
cars drivers, bike cyclists tend to bend forward when cycling. The purpose of
bending forward is to
(a)
Increase forward force (d) reduce the air pressure
(b)
Increase pressure (e) reduce air resistance
(c)
Increase the speed (f) increase power
(viii)
Just after combing the hair with a plastic comb,
the comb tends to attract small pieces of paper when brought near it. This is
because
(a)
Comb has a magnet (d) paper contain charge
(b)
Comb has magnetism (e) paper is light
(c)
Comb contain charge (f) paper has magnetism
(ix)
Pendulum principle has been applied for many
years even to former watchmakers. What principle does a pendulum apply?
(a)
Conservation of momentum (d) conservation of mass
(b)
Conservation of energy (e) potential energy
(c)
Exchange of energy (f) kinetic energy
(x)
The major cause of physical disabilities in the
people living nearby the nuclear plants is the radiation from radioactive
materials. In order to protect themselves against radiation from radioactive
substances these people need to use
(a)
Lead shield (d)
copper shield
(b)
Aluminium shield (e)
cobalt shield
(c)
Iron shield (f)
zinc shield
2. Matchthe items in LIST A with the correct response in
LIST B by giving the letter of the corresponding response besides the item
number in your answer sheet provided.
|
LIST A
|
LIST B
|
|
A.
Pass through
B.
A straight path of light
C.
Bending of light rays
D.
Stream of light rays
E.
Sending back of image
F.
Material which allow only one part of light to
pass through but you cannot see clearly through it.
G.
Throwing back of the light rays
H.
Plane mirror
I.
Maximum displacement of the particle.
J.
Allow light to pass and you can see through
K.
Snell’s law
L.
Distance between successive nodes or ant nodes
M.
Concave mirror
N.
Law of reflection
O.
Dispersion of light
P.
Curving of light rays
Q.
Rough surface
R.
Material which do not allow light to pass
through at all.
|
3. For each of the
items (i) – (x), fill in the blank spaces by writing the correct answer in the answer
sheet provided.
i.
The product of force and time is known
as.......................................................
ii. The
study of stationary electric charges is called...........................................
iii. Which
process involves heat transfer through
gases..............................................
iv. What
physical quantity is obtained by the ratio of distance moved by effort to
distance moved by the load.....................................
v. The
discharge of electrons from heated metal is known as .........................................
vi. The
process of mixing colored light by reflection from a white surface is
called.............
vii. Natural
resources that are used in the production of different forms of energies
without destroying an environment.........................
viii. A point
within the earth where an earthquake begins is called................................
ix. What
name given to the fixed path along which planets travel around sun?.....................
x. The
most probable radiation forming a well-defined track when passed in a cloud
chamber is called..........................................
SECTION
B (60 MARKS)
Answer
all questions in this section
4. (a) (i).Every electrical appliance should carry a label
stating the P.d and the power. What does it mean
when an energy saver bulb is labeled 240V,18W.
(ii) Find
the total cost of running simultaneously refrigerator rated 240V,1000W, radio
set rated 240V,60W and 20V,40W energy
saver bulb for five hours, If electricity cost 100/= per unit? (1unit = 1kwh)
(b). Two resistor of
and
are connected in
parallel and the arrangement is in the series with
resistor. If the
current passing through
resistor and
, calculate :-
i.
Current in the
resistor
ii.
Total potential difference across the whole circuit.
5.
(a). (i) State the principle of
moments.
(ii)
State Pascal’s principle of hydraulic press
(b). A uniform half meter rule is freely pivoted at the 15cm mark and
balanced horizontally when a body of
mass 40g is hung at the 2.0cm mark.
i.
Make a clear sketch to show the forces and their
position in the arrangement
ii.
Calculate the mass of the half – meter rule.
(c). A hydraulic press has a large circular piston of radius 0.8m and a
circular plunger of radius 0.1m. A force
of 200N is exerted by a plunger.
i.
Find the force exerted on a piston
ii.
If the plunger is moved through a distance of
0.64m in exerted its force, through what distance is piston raised?
6.
(a). (i). Define Radioactivity
(ii) what are the X – rays?
(b). Despite X – rays being dangerous to
human life, still have useful application in daily life. Describe how X – rays are used in the following fields.
(i). Medicine
(ii). Industry
(c). A uranium nucleus, 238U92 decay by emitting
two
- particle, and finally
form a Thorium(Th) nucleus.
(i). Write the equation for the
disintegration
(ii). What is the mass number and
atomic number of daughter nuclide?
7. (a)
State the Archimedes principle
(b)
(i). Boats and canoes which are used in transport and fishing do not
sink in water. Name and state the law,
which makes this possible
(ii). A piece of rubber with
volume 50cm3 is floating in water. If the density of rubber is
called 0.35g/cm3, calculate
the force required to immerse the rubber completely.
(c). A hot balloon which includes the
envelope, gondola, burner and fuel and one passenger has a total mass of 450kg. the air outside the
balloon is at 200C and has a density of 1.29kg/m3. The
air inside the envelope is heated
to a temperature of 1200C, at which it has a density of 0.89kg/m3. To what volume must the envelope expand to
just lift the balloon into air?
8. (a). Explain the difference between conductor,
semiconductor and insulator in terms of their energy bands.
(b). (i) what do you understand by the term
rectification?
(ii) draw the circuit diagram of the
full wave rectifier using four diodes
(c) . (i). What is transistor?
(ii). There are two types of bipolar
transistor which are pnp and npn, draw the circuit diagram for each type.
9. (a). (i) Define
acceleration due to gravity.
(ii) State Newton’s first law of
motion.
(b). A bomb is released from a military
aeroplane and strike the ground in 20 seconds. Assuming the air resistance in negligible, calculate:
(i). the height of the plane above
the ground.
(ii). The velocity with which the
bomb strikes the ground.
(c). A train weighing 200tones travel at a
speed of 54km/h. if an operator applies the brake and the train stops in two minutes.
(i) What distance will the train
travel in that time?
(ii) Find the average force
required stopping the train.
SECTION
C (10 Marks)
Answer
one (1) question from this section
10. (a) state (i). Lenz’s law of electromagnetic
induction.
(ii). Faraday’s law of electromagnetic
induction.
(b). Redraw each of the following
circuit diagrams below and indicates the direction of induced current, deflection of galvanometer and
polarity of a solenoid facing the magnet.
