⚛️ 1985

JAMB Physics 1985 past questions

26 questions from the 1985 JAMB UTME Physics paper. Free, with answers where available.

Practice with CBT mock → All Physics years
Physics JAMB 1985 Q4 ✓ Answer: D
Which of the following types of motion are oscillatory? I A driving board when used by a driver. II The motion of the balance wheel of a wrist watch. III The motion of the turn-table of a record player. IV The motion of the center of a ten kobo piece as it rolls down an inclined plane. V. The motion of the needle of a D.C. ammeter into which a low A.C. current is passed.
A
I and II only
B
I, II and III
C
II, III and IV
D
I, II and V
E
III, IV, and V.
Physics JAMB 1985 Q5 ✓ Answer: B
Velocity (ms-1) 6 0 1 2 3 4 5 6 Time (s) Fig 1 The graph Fig. 1 above describes the motion of a particle. The acceleration of the particle during the motion is
A
0.00m s2
B
0.25m s-2
C
4.00m s-2
D
8.00m s-2
E
10.00m s-2
Physics JAMB 1985 Q6 ✓ Answer: A
If a car starts from rest and moves with a uniform acceleration of 10m s-2 for ten seconds, the distance it covers in the last one second of the motion is
A
95 m
B
100 m
C
500 m
D
905 m
E
1 000 m
Physics JAMB 1985 Q9 ✓ Answer: E
Which of the following is NOT a force?
A
Friction
B
Tension
C
Upthrust
D
Weight
E
Impulse.
Physics JAMB 1985 Q10 ✓ Answer: B
Two masses 40g and 60g respectively, are attached firmly to the ends of a light metre rule. The centre of gravity of the system is
A
At the mid-point of the metre rule
B
40cm from the lighter mass
C
40cm from the heavier mass
D
60cm from the heavier mass
E
indeterminate because the metre-rule is light.
Physics JAMB 1985 Q11 ✓ Answer: B
P 10 20 300 80 M N L R O 30kg Fig 2 In Fig. 2 above. MN is a light uniform metre rule pivoted at O, the 80cm mark. A load of mass 3.0kg is suspended on the rule at L, the 10cm mark. If the rule is kept in equilibrium by a string RP, fixed at P and attached to the rule at R, the 20cm mark, then the tension T in the string is
A
25 N
B
50 N
C
250 N
D
5 000 N
E
25 000 N
Physics JAMB 1985 Q12 ✓ Answer: B
A 0.05kg bullet traveling at 500m s-1 horizontal strikes a thick vertical wall. A load of mass 3.0kg is [PAGE 15] suspended on the rule at L, the 10cm mark. If the rule is kept in equilibrium by a string RP, fixed at P and attached to the rule at R, the 20cm mark, then tension T in the string is
A
25 N
B
50 N
C
250 N
D
5 000 N
E
25 000 N
Physics JAMB 1985 Q14 ✓ Answer: C
Two drivers G and H are at depths 20m and 40m respectively below the water surface in a lake. The pressure on G is P1 while the pressure on H is P1. If the atmospheric pressure is equivalent to 10m of water, then the value of P2/P1 is
A
0.50
B
0.60
C
1.67
D
2.00
E
3.00
Physics JAMB 1985 Q15 ✓ Answer: D
The areas of the effort and load pistons of a hydraulic press are 0.5m2 and 5m2 respectively. If a force F1 of 100N is applied on the effort piston, the force F2 on the load is
A
10 N
B
100 N
C
500 N
D
1 000 N
E
5 000 N
Physics JAMB 1985 Q19 ✓ Answer: B
Two liquids, P at a temperature of 200C and Q at a temperature of 800C have specific heat capacities of 1.0J kg-1 0C-1 and 1.5J kg-1 0C-1 respectively. If equal masses of P and Q are mixed in a lagged calorimeter, then the equilibrium temperature is
A
440C
B
500C
C
560C
D
600C
E
700C
Physics JAMB 1985 Q21 ✓ Answer: D
In a gas experiment, the pressure of the gas is plotted against the reciprocal of the volume of the gas at a constant temperature. The unit of the slope of the resulting curve is
A
Force
B
Force/m
C
Work
D
Force/m3
E
Energy/m2.
Physics JAMB 1985 Q22 ✓ Answer: B
Water shows anomalous behaviour
A
Below 00C
B
Between 00C and 40C
C
At exactly 40C
D
Between 40C and 1000C
E
Above 1000C
Physics JAMB 1985 Q25 ✓ Answer: E
Which of the following statements is NOT correct?
A
Boiling occurs when the saturated vapour pressure of the liquid involved equals the external pressure.
B
Both the boiling point and the saturated vapour pressure of a given liquid depend on the external pressure.
C
The saturated vapour pressure rises with increase in temperature.
D
The saturated vapour pressure is independent of the volume available for the vapour.
E
It is possible to boil water at a lower temperature than 1000C at high altitude.
Physics JAMB 1985 Q26 ✓ Answer: D
Which of the following phenomena CANNOT be explained by the molecular theory of matter?
A
Expansion
B
Conduction
C
Convection
D
Radiation
E
Evaporation.
Physics JAMB 1985 Q27 ✓ Answer: A
In order 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 1500m/s, what is the depth of the sea?
A
0.75km
B
1.50km
C
2.20km
D
3.00km
E
3.75km
Physics JAMB 1985 Q28 ✓ Answer: B
When a sound wave passes from air into water its
A
Speed and frequency increase but its wavelength remains the same.
B
Speed and wavelength increase but its frequency remains the same
C
Speed decreases.
D
Speed remains the same but its frequency and wavelength change.
E
Speed increases but its frequency and wavelength decrease.
Physics JAMB 1985 Q29 ✓ Answer: A
If the fundamental frequency of a closed pipe organ on a day when the speed of sound is 340m s-1 is 170 Hz, then the length of the pipe is
A
50cm
B
70cm
C
100cm
D
150cm
E
200cm
Physics JAMB 1985 Q30 ✓ Answer: B
An object is placed 15cm in front of a concave mirror of radius 40cm. The image formed is
A
Virtual and 60cm behind the mirror
B
Real and 60cm in front of the mirror
C
Virtual and at infinity
D
Real and at infinity
E
Virtual and 40cm from the mirror.
Physics JAMB 1985 Q31 ✓ Answer: E
A 450 triangular glass prism can be used as a reflector of light because
A
Refraction never takes place in such a prism
B
The angle of reflection equals the angle of incidence.
C
The refractive index of glass is less than
D
It is transparent
E
The critical angle for glass is less than
Physics JAMB 1985 Q33 ✓ Answer: D
Two rays of light from a point below the surface of water are equally inclined to the vertical and are inclined to each other at 600 in water. What is the angle between the rays when they emerge into air? (Take the refractive index of water to be 4/3)
A
41.80
B
44.10
C
60.00
D
83.60
E
120.0.
Physics JAMB 1985 Q36 ✓ Answer: E
If the distance between two stationary charged particles is doubled, the magnitude of the electrostatic force between them will be [PAGE 17]
A
Passing on an electric current through a solenoid.
B
Repeated stroking of the specimen with a magnet
C
Repeated stroking of the specimen in opposite directions with two magnets
D
Heating of the specimen
E
Hammering of the specimen in the earth’s magnetic field’s
Physics JAMB 1985 Q39 ✓ Answer: C
Which of the following will convert a milliammeter to a voltmeter?
A
Low series resistance
B
Low parallel resistance
C
High series resistance
D
High parallel resistance
E
Parallel resistance equal to milliameter resistance.
Physics JAMB 1985 Q42 ✓ Answer: B
An electric kettle, connected to a 240V mains, produces 6.0 x 105J of heat energy to boil a quantity of water in 5 minutes. Find the resistance of the kettle.
A
14.4 ohms
B
28.8 ohms
C
144 ohms
D
288 ohms
E
2 880 ohms
Physics JAMB 1985 Q43 ✓ Answer: D
On which of the following does the operation of a moving coil ammeter depend? I Electromagnetic induction. II Force on a current-carrying conductor in a magnetic field. III Magnetic effect of an electric current.
A
I only
B
II only
C
III only
D
II and III
E
I, II and III
Physics JAMB 1985 Q44 ✓ Answer: B
10 Ohms 5Ohms Fig. 4 In Fig. 4, current (I) passes through the parallel combination. If the power dissipated in the 5 ohms resistor is 40W, then the power dissipated in the 10 ohms resistor is
A
10 W
B
20 W
C
40 W
D
80 W
E
100 W
Physics JAMB 1985 Q47 ✓ Answer: E
Which of the following statements about electrolysis is NOT correct?
A
The substances in solution in the electrolyte become ionized.
B
Ions are electrically charged and are attracted towards electrodes when a potential difference is applied.
C
Ions may be discharged at the electrodes, forming bubbles or deposits.
D
The mass deposited depends upon the length of time for which current flows.
E
The mass of gas set free or metal deposited is proportional to the square of the current.