This is to inform the General Jambites Association that jamb has made it compulsory that every jambites is to re-upload his/her O'Level result again including DE candidates.
[url]https://m.twitter.com/JAMBHQ

PHYSICS
1. The force with which an object is attracted to the earth is called
(a) Acceleration (b) Mass
(c) Gravity (d) Impulse (e) Weight
2. The refractive index of a liquid is
1.5. If the velocity of light in a vacuum is 3.0 x lO8ms1, the velocity of light in
the liquid is
(a) 1.5 x 108ms-1 (b) 2.0 x 108ms (c) 3.0 x 108ms (d) 4.5 x 108ms-1 (e) 9.0 x
108ms-1
3. A train has an initial velocity of
44m/s and an acceleration of -4mJs.
What is its velocity after 10seconds?
(a) 2m/s (b) 4m/s (c) 8m/s
(d) 12m/s (e) l6mJs
4. A man of mass 50kg ascends a flight of stairs 5m high in 5 seconds. If
acceleration due to gravity is 10ms2, the power expended is
(a) 100w (b) 300w (c) 250w (d) 400w (e) 500w
5. A machine has a velocity ratio of 5. If it requires a 50kg weight to overcome
200kg weight, the efficiency is
(a) 4% (b) 5% (c) 40% (d) 50%
(e) 80%
6. If the force on a change of 0.2 coulomb in an electric field is 4N, then the
electric intensity of the field is
(a) 0.8 (b) 0.8N (c) 20.QN/C (d) 4.2N/C (e) 20.OC/N
7. The resistance of a wire depends on (a) The length of the wire (b) The
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diameter of the wire (c) The temperature of the wire
(d) The resistivity of the wire
(e) All of the above
8. Which of these is not contained in
a dry cell?
(a) carbon rod
(b) paste of magnesium dioxide
(c) paste of ammonium chloride
(d) Zinc case (e) Copper rod
9. A simple pendulum 0.6m long has a period of 1.55. What is the period of a
similar pendulum 0.4m long in the same direction?
10. A devise that converts sound
energy into electrical energy is
(a) The horn of a motor car
(b) An AC generator
(c) A microphone
(d) The telephone earpiece
(e) A loud speaker
11. Radio wave has a velocity of
3x108ms1. If a radio station sends out a broadcast on a frequency 800KH3, what is
the wavelength to
the broadcast?
(a) 375.Om (b) 267.0m
(c) 240.Om (d) 37.5m (e) 26.7m 12,
12. Which of these is not a fundamental S.I. unit?
(a) Metre (b) Ampere (c) Kelvin
(d) Second (e) Radian
13. If two masses 40g and 60g respectively, are attached firmly to the end of a
light metre rule, what is the centre of gravity of the system?
(a) the mid point of the metre rule
(b) 40cm from the lighter mass
(c) 40km from the heavier mass
(d) 60cm from the heavier mass
(e) indeterminate because the metre-rule is light
14. To find the depth of the sea, a ship sends out a sound wave and receives
an echo after one second. If the velocity of sound in water is l500mJs, what is
the depth of the sea?
(a) 0.75km (b) 1.50km (c) 2.20km
(d) 3.00km (e) 3.75km
15. What is the number of neutrons in
the Uranium isotope 23802X?
(a) 92 (b) 146 (c) 238 (d) 330
(e) 119
16. The mode of heat transfer which does not require material medium
is
(a) conduction (b) radiation
(c) convection (d) propagation
127
17. The height at which the atmosphere ceases to exist is about 80km. If the
atmospheric pressure on the ground level is 760mmHg, the pressure at a
height on the ground level is 760mmHg, the pressure at a height of 20km
above the ground level is
(a) 380mmHg (b) 570mmHg
(c) 190nnHg (d) 480mmHg
18. Which of the following is common
to evaporation and boiling? They
(a) take place at any temperature
(b) are surface phenomena
(c) involve change of state
(d) take place at a definite pressure
(e) None of the above
19. Which of the following instrument
has a pure tone?
(a) Guitar (b) Vibrating string
(c) Turning fork (d) Screen
(e) Horns
20. Four lenses are being considered for use as a microscope object. Which of
the following focal lengths is most suitable? (a) -5mm (b) +5mm (c) -5cm (d)
+5cm (e) -5.5mm what is the wavelength to
the broadcast?
(a) 375.Om (b) 267.0m
(c) 240.Om (d) 37.5m (e) 26.7m 12,
12. Which of these is not a fundamental S.I. unit?
(a) Metre (b) Ampere (c) Kelvin
(d) Second (e) Radian
13. If two masses 40g and 60g respectively, are attached firmly to the end of a
light metre rule, what is the centre of gravity of the system?
(a) the mid point of the metre rule
(b) 40cm from the lighter mass
(c) 40km from the heavier mass
(d) 60cm from the heavier mass
(e) indeterminate because the metre-rule is light
14. To find the depth of the sea, a ship sends out a sound wave and receives
an echo after one second. If the velocity of sound in water is l500mJs, what is
the depth of the sea?
(a) 0.75km (b) 1.50km (c) 2.20km
(d) 3.00km (e) 3.75km
15. What is the number of neutrons in
the Uranium isotope 23802X?
(a) 92 (b) 146 (c) 238 (d) 330
(e) 119
16. The mode of heat transfer which does not require material medium
is
(a) conduction (b) radiation
(c) convection (d) propagation
127
17. The height at which the atmosphere ceases to exist is about 80km. If the
atmospheric pressure on the ground level is 760mmHg, the pressure at a
height on the ground level is 760mmHg, the pressure at a height of 20km
above the ground level is
(a) 380mmHg (b) 570mmHg
(c) 190nnHg (d) 480mmHg
18. Which of the following is common
to evaporation and boiling? They
(a) take place at any temperature
(b) are surface phenomena
(c) involve change of state
(d) take place at a definite pressure
(e) None of the above
19. Which of the following instrument
has a pure tone?
(a) Guitar (b) Vibrating string
(c) Turning fork (d) Screen
(e) Horns
20. Four lenses are being considered for use as a microscope object. Which of
the following focal lengths is most suitable? (a) -5mm (b) +5mm (c) -5cm (d)
+5cm (e) -5.5mm
21. The product PV where P is pressure and V is volume has the same unit as
a) Force (b) power c) energy d) acceleration e) all of above
22. Two strings of the same length and under the same tension give notes of
frequencies in the ratio 4:1 the masses of the strings are in the rates of
a) 2:1 b) 1:2 c) 1:4 d) 17 e) 1:16
23. a household refrigerator is rated 200 watts. If electricity is rated watts. If
electricity costs 5k per kwh, what is the cost of operating it for 20 days?
(a) N4.80 (b) N48.00 (c) N480.00
(d) N4800.00 (e) N240.00
24. The resistance of a. 5m uniform wire of cross-sectoral area of 0.2 x
ANSWER KEY
1A 2B 3B 4E 5C 6C 7E 8E 9B 10C 11A 12E 13C 14A 15B 16B 17B 18C 19C 20B
21C 22C 23A 24D 25A

CHEMISTRY
1. All the following will liberate a gas when reacted with dilute hydrochloric
acid except a) Sodium tetraoxosulphate(VI) salt b) Sodium trioxocarbonate(IV)
salt c) Sodium suiphide d) Sodium trioxonitrate(V)
2. The isomer of a compound C5H10 which does NOT decolorize bromine
water is
a) 2-methylbutane b) 2,2- dimethyipropane c) 2-methylbut- l-ene d)
Methylcyclobutane
3. A mixture of nitrogen, oxygen and helium contains 0.25, 0.15 and 0.4
mole of these gases respectively. If the pressure contribution due to oxygen
was
2.5 atm. The partial pressure of helium is a)4.0 atm b)0.8 atm c)3.33
atm d) 6.67 atm
175
4. Elements P has atomic number of 12 while element Q has an atomic
number 15. Combination of P and Q gave a compound
PmQn. the respective values of m and n are a) 2and2 c) 3and2 c
5. CHx9O2—6CO2+ 6H20
The hydrocarbon, CH in the reaction above is most likely
a) Analkane b)abenzene
c) analkene d)analkyne
6. A 5 12cm3 sample of a gas weighed 1.236g of 20°C and a pressure of
one atmosphere. The reactive molecular mass of the gas is [R = 8.314kJk-1, I
atm
= 101,325Jm-3]
a) 58.07 b) 588.367
c) 5.88 d) 197.9
7. The amount of methane molecules, Cl4 in 8.Ograms of methane is
a) 8mol b) l28mol
b) 2 and 3 ) 2 and 1
c) 0.Smol d) 3.01 x lO23mol
8. The concentration of a solution obtained by dissolving 0.53g of pure
anhydrous Na2CO3 in water to make 250cm3 of solution.
a) 2.0 x 10-5 mol dm-3
b) 2.lgdm-3
c) 2.0 x 10-2 mol dm-3
d) 5.0 x 10-3 mol dm-3
9. What is the maximum volume of CO2 at s.t.p. that can be obtained when
dilute hydrochloric acid is added to 10grams of CaCO3? [Ca=40, C=12, 0 = 16]
a) 2.24 dm3 b) 22.4 dm3
176
c) 0.224 dm3 d) 22.4dm3
10. Sulphur (IV) oxide travels a given distance in l0sec. How long will it
take equal 1. All the following will liberate a gas when reacted with dilute
hydrochloric
acid except a) Sodium tetraoxosulphate(VI) salt b) Sodium trioxocarbonate(IV)
salt c) Sodium suiphide d) Sodium trioxonitrate(V)
2. The isomer of a compound C5H10 which does NOT decolorize bromine
water is
a) 2-methylbutane b) 2,2- dimethyipropane c) 2-methylbut- l-ene d)
Methylcyclobutane
3. A mixture of nitrogen, oxygen and helium contains 0.25, 0.15 and 0.4
mole of these gases respectively. If the pressure contribution due to oxygen
was
2.5 atm. The partial pressure of helium is a)4.0 atm b)0.8 atm c)3.33
atm d) 6.67 atm
175
4. Elements P has atomic number of 12 while element Q has an atomic
number 15. Combination of P and Q gave a compound
PmQn. the respective values of m and n are a) 2and2 c) 3and2 c
5. CHx9O2—6CO2+ 6H20
The hydrocarbon, CH in the reaction above is most likely
a) Analkane b)abenzene
c) analkene d)analkyne
6. A 5 12cm3 sample of a gas weighed 1.236g of 20°C and a pressure of
one atmosphere. The reactive molecular mass of the gas is [R = 8.314kJk-1, I
atm
= 101,325Jm-3]
a) 58.07 b) 588.367
c) 5.88 d) 197.9
7. The amount of methane molecules, Cl4 in 8.Ograms of methane is
a) 8mol b) l28mol
b) 2 and 3 ) 2 and 1
c) 0.Smol d) 3.01 x lO23mol
8. The concentration of a solution obtained by dissolving 0.53g of pure
anhydrous Na2CO3 in water to make 250cm3 of solution.
a) 2.0 x 10-5 mol dm-3
b) 2.lgdm-3
c) 2.0 x 10-2 mol dm-3
d) 5.0 x 10-3 mol dm-3
9. What is the maximum volume of CO2 at s.t.p. that can be obtained when
dilute hydrochloric acid is added to 10grams of CaCO3? [Ca=40, C=12, 0 = 16]
a) 2.24 dm3 b) 22.4 dm3
176
c) 0.224 dm3 d) 22.4dm3
10. Sulphur (IV) oxide travels a given distance in l0sec. How long will it
take equal
volume of helium to travel the same distance under the
same conditions?
[S=32, O=16, He=4}
a) 1.6sec b)40sec
c) 5.Osec d) 2.Ssec
11. The volume of hydrogen gas produced at s.t.p. when 100cm of 2M
hydrochloric acid reacts
with excess zinc is
a) 2.24dm3 b) 4.482.24dm3
c) 1.12dm3 d)4.8dm3
12. During electrolysis, two cells each containing molten A1203 and fuse CaCI2
were connected in series. A current of l5Amp was passed through the cells for
a
given period of time. At the end of the electrolysis 9g of calcium was
found to have been deposited at the cathode what mass of aluminium would be
deposited in the second cell [Al=27, Ca=40]
a) 8.82g b) 4.44g c) 17.60g d) 4.05g
13. The balanced equation for the reaction of tin(ii) salt with potassium
ptaoxodichromate(VI) in a acidic medium can be represented as eSn2 +
fCr2O7 + gH+ → hSq+ iCr3+ + jH2 O e,f,g.h,i and j are respectively
a) 3,5.6.3,land4
b) 3. 1. 14.3,2and7
c) 3,2,6,1,5and6
d) 5.2,1,5,3and2
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14. The pH of a solution containing 0.5 x 10-6 M H2S04 is
a) 6.3 b) 6.5 c) 6.0 d) 5.0
15. Which of the following oxides will NOT dissolve in both dilute
hydrochloric acid and 2M sodium hydroxide solution?
a) Lead (II) oxide b) Aluminium oxide c) Zinc(II) oxide d) Calcium oxide
16. The I.U.P.A.C. name for the compound
is
a) Pent-3-enoic acid
b) Pent-4-enoic acid
c) Pent-2-enoic acid
d) Pent-3-ene-l-oic acid
17. Metal salts of long chain fatty acids are known
as
a) Detergents b) double salts c) soaps d) grease
a) CHCOOH and CH3CH2CH2OH
b) CH3COOH and CH3CH7CH3
c) CH3COOH and CH3CH2OHof oxidation of
a) butan-3-ol
b) butan-I-ol
c) 3-methylpropan-2-ol
d) Butan-2-ol
20. Which of the following structural formulas is NOT isomeric with the
others?
a) CH3CH2CH2CH2-OH
b) CH3-O-CH2CH2CH3
The curve above represents the solubility curve of KCIO3. The number of moles
of
KCIO3 crystals produced by cooling 200cm3 of a saturated solution
of the salt from 65°C to 25°C is
17
a) 6.30mole b) 3.26mole
c) 0.63mole d) 7.3Omole
22. During a compression process involving an ideal gas at pressure P1, when
the
volume, V of the gas was halved, the temperature in Kelvin increases by half
its initial
value. The final pressure P2 is given by
a) 3P1 b) 12P1 c) 6P1 d) 1.5P1
23. Cellulose and starch can be classified as one of the following:
a) Hydrocarbons b) sugars
e) carbohydrates d) alkaloids
ANSWER KEY
I. D 6. A 11. A 16. C 21. B
2. D 7. D 12. D 17. C 22. A
3. D 8. C 13. B 18. A 23. C
4. C 9. A 14. C 19. D 5. C 10.D 15.D 20.C