​Jamb 2014 questions and answers for physics 

​Jamb 2014 questions and answers for physics 
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1.The refractive index of the medium M in the
diagram above is
A 2 B. 1 C. 2 3 D. 3
 3 3
2. What types of mirrors are capable of producing
parallel beams of light such as those arising from
the headlamps of a car?
A. Cylindricalmirrors
B. B. Parabolicmirrors.
C. C. spherical mirrors
D. Planemirrors.
3. A person can focus an object only when it lies
within 200cm from him. Which spectaclesshould
be used to increase his maximum distance of
distinct vision to infinity?
A. Concave lens B. Plane glasses
C. Binoculars. D. Convex lens
4. In which of the following material media would
sound travel faster?
A. Water B. Oil
C. Metal D. Gas
5. Calculate the angle ofminimum deviation for a ray
which is refracted through an equiangular prism
ofrefractive index 1.4.
A. 290 B. 600
C. 990 D. 900
6. What happens to the rays in a parallel beam of
light?
A. They diverges as they travel
B. Theymeet at infinity
C. They intersect
D. They converge as they travel
7. If u isthe object distance and v the image distance,
which of the following expressions givesthe linear
magnification produced by a convex lens of focal length f?
A. u 
+ f B. u 
– f
 C. v 
– 1
 V f f
D. v 
+ 1
 f
8. A ray of light make an angle of 350 with a plane
mirror. What isthe angle of reflection?
A. 550 B. 350
C. 700 D. 650
9. The pitch of a sound note depends on
A. Timbre B. Harmonics
C. Quality D. frequency
10. If the angle between two vectors P and Q is 00
, the
vectors are said to
A. Be perpendicular B. Be parallel
C. Intersect at angle 600
D. Intersect at angle 450
11. A machine whose efficiency is 60% has a velocity
ratio of 5. If a force of 500N is applied to lift a load
P, what isthe magnitude of P?
A. 750N B. 4166N
C. 50N D. 1500N
12. A body of mass 4kg is acted on by a constant
force of 12N for 3 seconds. The kinetic energy
gained by the body at the end of the time is
A. 162J B. 144J
C. 72J D. 81J
13. As the pressure of a fluid increase, its viscosity
A. Decreased B. remains constant
C. Increases then decrease D. In crease.
14. I. Jet-propelled aircraft
II Rocket propulsion
III The recoil of a gun
IV A person walking
Which of the above is based on Newton’s third
law of motion?
A. I, II, III and IV B. I and III only
C. I and II only D. I, II and III only
15. In a hydraulic press, a force of 40N is applied on
the effort piston area 0.4m2
. Ifthe force exerted on
the load piston is 400N, the area ofthe large piston
is A. 8m2 B. 4m2
C. 2m2 D. 1m2
16. A 100kg box is pushed along a road with a force of
500N. Ifthe box moves with a uniform velocity, the
coefficient of friction between the box and the road
is
A. 0.5 B. 0.4
C. 10 D. 0.8
[g = 10ms-2]
17. The earth is four times the size of the moon and
the acceleration due to gravity on the earth is 80
times that on the moon. The ratio of the mass of
the moon to that of the earth is
A. 1 : 320 B 1 : 1280
C. 1: 80 D. 1 : 4
18.
The diagram above showsforces 4N, 6N, 10N and
8N which act at a point O in directions indicated.
The net horizontal force is
A. 7 3N B. 17N
C. 3N D. 13N
19. A radioisotope has a decay constant of 10-7s
-1
.
The average life of the radioisotope is
A. 6.93 x 108
s B. 1.00 x 10-7s
C. 1.00 x 107
s D. 6.93 x 107
s
20. A moving-coil galvanometer has a full-scale
deflection of 3A equivalent to 300 deflection. Then
sensivity of the instrument is
A. 10.0 B. 33.0
C. 90.0 D. 0.1
21. The binding energy of helium 
4
2He is
A. 2.017U B. 0.033U
C. 4.033U D. 0.330U
[atomic mass of proton = 1.00783U,
atomicmass of neutron = 1.00867U]
22. In a tuned radio receiver R, L, C series circuit for
resonance, the inductive and capacitive reactance
XL
and XC
respectively are related as
A. XL
= 1 B. XL
= 1 X.C
 X.C
 2
C. XL
= X.C D. XL
=2X.C
23. The particle and wave nature of matter are
demonstrated in the equation
A. = h B. = c
 P f
C. = 2d sin Q D. = hc
 E
24. For semiconductorsto have negative temperature
coefficient of resistance implies that
A. They have electrons and holes at high
temperatures
B. Their resistance is constantly changing with
temperature
C. Their resistance increases with temperature
D. Their resistance decreases with temperature
25. Fluorescent tubes produce light by the
A. Refraction of light by gas molecules
B. Excitation of gas molecules
C. Conduction of solar energy
D. Thermal agitation of electronsin the tube.
26. In a reverse biased junction diode, current flows
in by
A. Electrons alone B. Majority carriers
C. Minority carriers D. Positive holes alone
27. The energy stored in an inductor of inductance
5mH when a current of 6A flows through it is
A. 1.8 x 10-2J B. 9.0 x 10-3J
C. 1.4 x 10-2J D. 9.0 x 10-2J
28. X-rays can be used in the study of crystal
structures because they
A. Have an extremely short wavelength
B. Have-a-very-long-reaching wavelength
C. Are very fast
D. Are invisible.
29. An a.c. circuit of e.m.f. 12V has a resistor of
resistance 8 Ohms connected in series to an
inductor of inductive reactance 16 Ohms and a
capacitor of capacitive 10 Ohms. The current flow
in the circuit is
A. 1.4A B. 14.0A C. 1.2A D. 12.0A
30. A generator-manufacturing company was
contracted to produce an a.c. dynamo but
inadvertently produced a d.c. dynamo. To correct
this error, the
A. Commutatorshould be replace with slip rings.
B. Commutator should be replace with slit rings
C. Armature coil should be made aluminium
D. Armature coil should be made silver.
1. Transverse waves can be distinguished from
longitudinal waves using the characteristic of
A. Diffraction B. Polarization
C. Reflection D. Refraction.
32. When left in a freezer, a bottle full of water cracks
on freezing into ice because of the
A. Decreases in the volume of water
B. Contraction of the bottle
C. Expansion of the bottle
D. Increase in the volume of water
34. The change in volume when 450kg of ice is
completelymelted is
A. 0.05m3 B. 0.45m3
C. 4.50m3 D 0.50m3
[density of ice = 900 kgm-3
density of water = 1 000 kgm m-3]
35. Ifa forceof50Nstretches awire from20mto20.01m,
what isthe amount of force required to stretch the
samematerialfrom 20mto20.05m?
A. 100N B. 50N
C. 250N D. 200N
36. Tea pots are often silver-coated to prevent hear
loss by
A. Convection and conduction
B. Radiation only
C. Conduction only
D. Convection only.
37.
The phase difference between waves P and Q in
the diagram above is
A. B. 2
 2
C. D.
 4
38. Metal rods oflength 20cm each are laid end to end
to form a bridge at 250C. What gap will be provided
between consecutive rails for the bridge to
withstand 750C?
A. 0.22m B. 0.25m
C. 0.02m D. 0.20m
[Linear expansivity of thematerial = 2.0 x 10-5K-1]
A. 500 J kg-1 K-1 B. 130 J kg-1 K-1
C. 390 J kg-1 K-1 D. 400 J kg-1 K-1
40. I. Wavelength
II Medium of propagation
III Wave velocity
IV Frequency
V. Energy
Which of the above are used for characterizing
waves?
A. I, II andV. B. II, IV and V
C. I and IV D. I, III and IV
41. The instrument used for securing a large
number ofsimilar charges by induction is called
A. Capacitor B. Electrophorus
C. Electroscope D. Proof-plane
42. A steady current 2A flowsin a coil of e.m.f. 12V
for 0.4s. A back e.m.f. of 3V wasinduced during
this period. The stored energy in the loop that
can be utilized is
A. 7.2J B. 12.0J
C. 2.4J D. 9.6J
43. If 16mA of current flowsthrough a conductor
in one second, the number of electrons
transported per second is
A. 1.00 x 1020 B. 1.00 x 1717
C. 2.54 x 10-17 D. 2.56 x 10-18
[1 electronic charge = 1.6 x 10-19C]
44. The difference between x-rays and gamma rays
is that
A. X-rays arise from energy changesin the
electronic structure of atoms while gamma
rays come from the nucleus.
B. X-rays are electromagnetic radiations
while gamma rays are negatively charges
radiations.
C. X-rays have higher frequencies than
gamma rays
D. X-rays aremore penetrating than gamma
rays.
In the diagram above, the ratio of the electric power
dissipated in the 6 Ohms and 3 Ohms resistors
respectively is
A. 2 : 3 B. 1: 2
C. 1: 3 D. 2 : 1
46. To protect a material from the influence of an
external magnetic field, thematerialshould be kept
in a
A. Square steel ring B. Loop of copper wire
C. Triangular zinc ring D. Soft iron ring.
47. Which of the following is an electrolyte?
A. Grape juice B. Sugar solution
C. Alcohol D. Paraffin
48. Electrical appliancesin homes are normallyearthed
so that
A. Both the a.c. and d.c. sources can be used
B. A person touching the appliances is safe
from electric shock
C. The appliances aremaintained at a higher
p.d. than the earth
D. The appliances are maintained at a lower
p.d. than the earth
49. Acell whose internalresistance is 0.5 Ohms delivers
a current of 4A to an external resistor. The lost
voltage of the cell is
A. 1.250V B. 8.000V
C. 0.125V D. 2.000V
50. Given three capacitors 0.3uF, 0.5 uF and 0.2 uF, the
joint capacitance when arranged to giveminimum
capacitance is
A. 0.3uF B. 1.0uF
C. 0.1uF D. 0.5uF

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