CHILDREN & YOUTH DEVELOPMENT INITIATIVE CENTRE (CYDIC) NECTA PREPARATORY EXAMS (NAPE) PHYSICS series 1
CHILDREN & YOUTH DEVELOPMENT
INITIATIVE CENTRE (CYDIC)
NECTA PREPARATORY EXAMS (NAPE)
PHYSICS series 1
Time: 2:30 HRS Sat.
19th Aug 2017
INSTRUCTIONS
01. This paper consists of section
A, B and C
02. Answer all questions
03. Cellular phones and calculator
are not allowed in the examination room
04. Where necessary the following
constants may be used
g = 9.8
N/Kg, =3.14, Density of water (=1000kg/ms)
SECTION A
1. For each of the items i – x
choose the correct answer from among the given alternative and its letter
besides the item number.
i. What is the SI unit of force?
A).
N/M
B).Kgm/s C).Kgm/J D). Kgms-2
ii. What is normal reaction of a
body of mass 10kg placed on an inclined plane of 300?
A).
8.66N B).86.6N C).10Kg D).
10N/m
iii. ________ is SI unit of
temperature?
A). Kelvin (K) B) Fahrenheit (0F)
C) Centigrade (0C)
D) Kevin(K”)
iv. ________is wavelength of note
if the speed of sound in air is 330m/s and its frequency is 440Hz.
A) 0.8m B) 0.75m C)
1.33m D) 145200m
v. A weight of a stone in air is
20N and when immersed in a liquid tend to be 15N. What is its up thrust?
A) 5N B) 20N C)
15N D) None of the above
vi. A weight of thread is 0.00034000N.
Write this weight in to three significant figures.
A)
0.000N B) 0.034N C) 0.000340N D)
None of the above
vii. Ally measured his arm to be
with the following measurement. Which one is most accurate?
A)
10.1cm B) 10cm C)10.10045cm D)
10.1045321cm
viii. ___________ is a speed of
light.
A)
3x108m/s B) 3x10-8m/s C) 3x108km/h D)330m/s
ix. Is a pressure wave created when
an air craft is travelling at supersonic speed so as to overtake its own sound
waves
A) Supersonic sound B)
sonic boom C) sea wave
D)
transverse wave
x. _____________ is an instruments
used to detect the presence of charge.
A). Magnetic B). Gold leaf C). Voltmeter
D).
Negative and positive charge.
_________________________________________________________________________________________________
2. Match the responses in LIST B with the word or
phrases in LIST A by writing its letter of correct responses besides the item
number.
|
LIST A
|
LIST B
|
|
i.
Digital
|
A. The change of state from
liquid to solid
|
|
ii.
Dynamo
|
B. The hange of state from gas to
liquid
|
|
iii.
Solidification
|
C. A.C generator
|
|
iv.
Valence
band
|
D. D.C generator
|
|
v.
Analogue
|
E. A bicycle battery
|
|
vi.
Antinodes
|
F. Lowest energy band for a
crystal structure
|
|
vii.
Electrophorus
|
G. A signal consist if 1s and 6s
only
|
|
viii. Gold leaf
|
H. A signal that varies over a
continuous angle of value
|
|
ix.
Capacitor
|
I. Sparks by induction
|
|
x.
Momentum
|
J. Store charge
|
|
|
K. Testing charge
L. Kgm/s
|
3.(i). What is cathode ray
oscilloscope?
(ii) Explain the mode of action of cathode
ray oscilloscope.
4. (a) Define the following
terms
(i). Kinetic energy (K.E)
(ii) Potential energy (P.E)
(b) The water of mass 1000kg
falling through a height of 50m sinking
waterfalls.
(i) Calculate its potential energy.
(ii) Velocity of water
5. (a) Define the following
terms
i. focal length
ii. Centre of curvature
iii. Radius of curvature
(b) i.
Show that m= v
f-1
ii. An object 2cm high is placed 10cm in front
of thin convex lens of focal length 4cm.
6. (a) Define terminologies of
the following.
i. Electronics
ii. Transistor
iii. Amplification
iv. Intrinsic semiconductor
v. N – type transistor
(b). i. explain how extrinsic
semi-conductor is formed
ii. What is the type of extrinsic semi conductor?
7. (a) i. Define the term
machine
ii. Mention types of machine
(b) i. why piece of iron sink
in ocean while a large ship tend to float on the ocean.
ii. Density of mercury is
1300Kgm-3. To find it R.D(use density of water 1000kgm-3.
8. (a) i. What I hydrometer?
ii. Draw a diagram of hydrometer and label it.
(b). i. what is surface tension.
ii. Write the factor affecting surface tension
iii. Explain why a small bird
tend to float on the surface of water if does not disturbed?
9. (a) i. a block and tackle
pulley system has a number of pulleys are 5pulleys. If a load of 100N is raised
by using a force of 50N. Calculate
i. mechanical advantages
ii. Velocity ratio
iii. Efficiency
(b). why is any machine the efficiency
is less than 100%?
10. (a) i. Mention (write) three equation of a
motion.
ii. Why bodies after thrown up after sometimes tend to fall
back?
(b). state three Newton’s law of motion
SECTION
C
11. (a) i. explain the term
natural radioactivity
ii. Explain three radioactive particles
(b). the half life of Thorium – 234 is 24
days. Calculate the mass remaining unchanged of 0.64g of the substance after.
i) 48 days.
ii) 72 days.
iii) 96 days.
12. (a) i. What are comets?
ii. Zodiac light
iii. Asteroids
iv. Astronomy
(b) (i) Explain the meaning of the term
global warming
ii) What is he effect of global warming.
iii) What is causes of green house effects?
