CSEE
Physics · Karatasi 1 · 2013
18 maswali 🇹🇿 NECTA
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TZS 200
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Maswali (18)
Sehemu A
4.
1 alama
A body is said to be in equilibrium if
A.
it moves with uniform speed
B.
the net force acting on it is zero
C.
the upward and downward forces are equal
D.
its centre of gravity is low positioned
E.
its centre of gravity is high.
5.
1 alama
The correct statements about sound waves is that they
A.
are transverse waves
B.
can travel in vacuum
C.
can be polarized
D.
cannot be polarized
E.
do not require medium.
6.
0 alamas
Briefly explain why
(a(i))
Nylon clothes crackle when undressed?
0 alama
(a(ii))
Petrol road tankers usually have a length of metal chain hanging and touching the ground?
0 alama
(b(i))
an ebonite rod is rubbed with fur?
0 alama
(b(ii))
a glass rod is rubbed with fur?
0 alama
(c(i))
Define electric current.
0 alama
(c(ii))
Two cells each of e.m.f. 6 V and internal resistance of 5 Ω and 6 Ω respectively are connected in parallel to a resistor of 10 Ω. Find the current flowing in the 10 Ω resistor.
0 alama
Boresha ili kuona majibu ya mfano.
7.
0 alamas
Briefly explain the reasons for the following:
(a)
What is an altimeter?
0 alama
(b(i))
A person at great height suffers from nose bleeding.
0 alama
(b(ii))
It is painful to walk barefoot on a road that is covered by pebbles.
0 alama
(c(i))
the difference between the pressure on the bottom of the cube and the pressure on its top.
0 alama
(c(ii))
the weight of water displaced by the cube.
0 alama
Boresha ili kuona majibu ya mfano.
8.
1 alama
The image formed by plane mirrors are always
A.
real, magnified and laterally inverted
B.
virtual, laterally inverted and same in size
C.
magnified, virtual and erect
D.
laterally inverted, same in size and real
E.
erect, real and magnified.
9.
1 alama
Which of the following particles is used to cause fission in an atomic reaction?
A.
proton
B.
deuteron
C.
neutron
D.
beta-particle
E.
alpha-particle
Sehemu B
0.
0 alamas
(b(i))
List down the various layers of the atmosphere starting from the Earth’s surface.
0 alama
(vi)
When the temperature at the surface is below the freezing point, dew takes
the form of ice called .
1 alama
(b(ii))
Which layer in part (b) (i) above is nearest to the Earth? Explain two importances of it.
0 alama
(vii)
The movement of particles from a region of high concentration to one of
low concentration is called .
1 alama
(viii)
Wheelbarrows and bottle openers are in the class of
levers.
1 alama
(c(i))
What is a constellation?
0 alama
(ix)
The process of converting sinusoidal wave forms into unidirectional (non-
zero) waveforms is known as .
1 alama
(c(ii))
Briefly explain the causes of ocean tides.
0 alama
(x)
A resistor of low resistance used to convert a moving coil galvanometer
into an ammeter is called .
1 alama
Boresha ili kuona majibu ya mfano.
3.
5 alamas
For each of the items (i)-(x), fill in blank spaces by writing the correct answer on the space provided.
(i)
What is a term given to a glowing asteroid in space which can be seen with naked eyes?
1 alama
(ii)
The timbre of a sound is also referred to as .
1 alama
(iii)
The angle between the horizontal component of the Earth’s magnetic field and true north is called .
1 alama
(iv)
The production of an e.m.f. in a conductor as a result of changing current in the same conductor is referred to as .
1 alama
(v)
The combination of multiple echoes in the listener’s ear produce a louder and more sustained sound called .
1 alama
Boresha ili kuona majibu ya mfano.
Sehemu C
10.
10 alamas
(a(i))
State the laws of electromagnetic induction.
0 alama
(a(ii))
Mention two advantages of a.c. generators over d.c. generators.
0 alama
(b(i))
Briefly explain why the core of a transformer is made of thin layers of metal insulated from one another.
0 alama
(b(ii))
Describe the structure of a step-up transformer and state how it works.
0 alama
(c)
A transformer with 4800 turns in the primary coil is designed to work from 240 V a.c. mains to give a supply of 8 V in order to ring a bell.
0 alama
(c(i))
What would happen if the transformer were connected to a 240 V d.c. mains?
0 alama
(c(ii))
Briefly explain why the primary current increases when a bell is being rung?
0 alama
Boresha ili kuona majibu ya mfano.
11.
10 alamas
(a)
Mention two practical examples in our daily life in which the principle of conservation of energy is applied.
0 alama
(b(i))
What is a simple pendulum.
0 alama
(b(ii))
Describe the energy changes that take place when a simple pendulum swings from one side to another.
0 alama
(c)
Name a machine or an apparatus used to change the following forms of energy.
0 alama
(c(i))
Heat energy to mechanical energy.
0 alama
(c(ii))
Mechanical energy to electrical energy.
0 alama
(c(iii)
Electrical energy to sound energy.
0 alama
(c(iv))
Sound energy to electrical energy.
0 alama
(c(v))
Heat energy to electrical energy.
0 alama
Boresha ili kuona majibu ya mfano.
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