⚛️ 1992

JAMB Physics 1992 past questions

28 questions from the 1992 JAMB UTME Physics paper. Free, with answers where available.

Practice with CBT mock → All Physics years
Physics JAMB 1992 Q1 ✓ Answer: B
What is the least possible error in using rule graduated in centimeters?
A
0.1cm
B
0.5cm
C
1.0cm
D
2.0cm
Physics JAMB 1992 Q2 ✓ Answer: B
Which of the following affects the period of a simple pendulum? I Mass of the pendulum bob II Length of the pendulum III Acceleration due to gravity.
A
I, II and III
B
II and II only
C
I and III only
D
I and II only.
Physics JAMB 1992 Q8 ✓ Answer: C
In the diagram above, the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static friction between the mass m1 and the table is
A
m1 [PAGE 47]
B
m1g
C
m2 m1
D
m2g m1
Physics JAMB 1992 Q10 ✓ Answer: B
In an experiment to determine Young’s Modulus for a wire, several; loads are attached to the wire and the corresponding extensions measured. The tensile stress in each case depends on the
A
Load and the extension
B
Load and the raiud of the wire
C
Radius of the wire and the extension
D
Extension and the original length of the wire.
Physics JAMB 1992 Q12 ✓ Answer: C
If a plastic sphere floats in water (density = 1000kg m-3) with 0.5 of its volume submerged and floats in oil with 0.4 volume submerged, the density of the oil is
A
800 kg m-3
B
1 200 kg m-3
C
1 250 kg m-3
D
2 000 kg m-3
Physics JAMB 1992 Q16 ✓ Answer: C
At constant pressure, the density of a fixed mass of gas is
A
Constant with temperature
B
Proportional to its volume
C
Inversely proportional to its temperature
D
Independent of its volume
Physics JAMB 1992 Q17 ✓ Answer: B
How much heat is absorbed when a block of copper of mass 0.05kg and specific heat capacity 390J kg-1 K-1 is heated from 200C to 700C?
A
3.98 x 10-1 J
B
9.75 x 102 J
C
3.98 x 103 J
D
9.75 x 103 J
Physics JAMB 1992 Q19 ✓ Answer: C
The space between the double glass walls of a thermos flask is evacuated and the two surfaces facing the evacuated space are silvered. The residual source of heat loss takes place by
A
Convection
B
Radiation from the surfaces’
C
Conduction through the stopper and the glass.
D
Conduction across the walls.
Physics JAMB 1992 Q20 ✓ Answer: B
The equation of wave is y = 0.005 sin [x(0.5x – 200 t)]1 where x and y are in metres and t is in seconds. What is the velocity of the wave?
A
4 000 m s-1
B
400 m s-1
C
250 m s-1
D
40 m s-1
Physics JAMB 1992 Q21 ✓ Answer: D
Which of the following characteristics of a wave is used in the measurement of the depth of the sea?
A
Diffraction
B
Interference
C
Refraction
D
Reflection [PAGE 48]
Physics JAMB 1992 Q23 ✓ Answer: C
What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolutions per second?
A
80 Hz
B
600 Hz
C
800 Hz
D
1 600 Hz
Physics JAMB 1992 Q24 ✓ Answer: C
Which of the following properties make the convex mirror useful as a driving mirror? I The image is real II The image is erect III It has a wide field of view IV The image is magnified
A
I, II and IV
B
I, II and III
C
II and III
D
I and III.
Physics JAMB 1992 Q25 ✓ Answer: D
When an object is placed very close to the pole of a concave mirror, the virtual image obtained is
A
Diminished and upright
B
Diminished and inverted
C
Enlarged and inverted
D
Enlarged and upright.
Physics JAMB 1992 Q27 ✓ Answer: D
Which of the following statements is CORRECT about a long-sighted boy who does not put on glasses?
A
He cannot see distance objects clearly
B
Rays of light from a close objects are focused in front of his retina
C
His eyeball is too long
D
Parallel rays of light are focused behind his retina.
Physics JAMB 1992 Q28 ✓ Answer: C
The speed of light in air is 3 x 108 m s-1. What is the peed in glass with a refractive index of 1.50?
A
1.5 x 108 m s-1
B
3.0 x 108 m s-1
C
2.0 x 108 m s-1
D
6.0 x 108 m s-1.
Physics JAMB 1992 Q30 ✓ Answer: B
Which of the following arrangements of the components of electromagnetic spectrum is in ascending order of wavelengths?
A
Gamma rays, ultraviolet rays, x-rays, infra-red rays.
B
Gamma rays, x-rays, ultraviolet rays, infra-red rays
C
Infra-red rays, ultraviolet rays, x-rays, gamma rays.
D
Gamma rays, ultraviolet rays, infra-red rays, x- rays.
Physics JAMB 1992 Q31 ✓ Answer: A
The diagram above represents the field pattern obtained by bringing the poles of two magnets near each other. The poles must be
A
N – N poles
B
S – S poles
C
S – N poles
D
N – S poles
Physics JAMB 1992 Q32 ✓ Answer: D
The angle between the direction of the earth’s magnetic field and the horizontal is called the
A
Angle of deviation
B
Magnetic declination
C
Magnetic meridian
D
Angle of dip
Physics JAMB 1992 Q33 ✓ Answer: A
Calculate the force acting on an electron of charge 1.6 x 10-19 C placed in an electric field of intensity 108V m-‘.
A
1.6 x 10-11 N
B
1.6 x 10-14 N
C
1.6 x 10-16 N
D
1.0 x 10-16 N
Physics JAMB 1992 Q35 ✓ Answer: B
Which of the following factors has no effect on e.m.f. of a primary cell?
A
Temperature
B
Size of the cell
C
Nature of the plates
D
Nature of the electrolyte. [PAGE 49]
Physics JAMB 1992 Q37 ✓ Answer: C
The diagram above shows a meter bridge in which two of the arms contain resistances R and 2 ohms. A balance point is obtained at 60cm from the left end. Calculate the value of R.
A
1.2 Ohms
B
1.3 Ohms
C
3.0 Ohms
D
6.0 Ohms
Physics JAMB 1992 Q38 ✓ Answer: C
The circuit diagram above contains four ammeter W, X, Y and Z. Which of the following statements about the ammeter reading is correct?
A
The reading of W is equal to that of Y and twice that of X.
B
The reading of y is greater than that of Z
C
The readings of W and Y are equal and each is greater than that of X.
D
The reading of Z is equal to the sum of the readings of W and Y.
Physics JAMB 1992 Q39 ✓ Answer: B
A 5-V battery is connected across the plates of a 2.0 ìF unchanged parallel plate capacitor. The charge on the capacitor after a long time is
A
1.5 uC
B
10.0 uC
C
20.0 uC
D
50.0 uC
Physics JAMB 1992 Q40 ✓ Answer: C
Which of the following apparatus will require the smallest fuse rating for its protection?
A
60W, 240V
B
60W, 40V
C
40W, 12V
D
40W, 5V
Physics JAMB 1992 Q42 ✓ Answer: D
The heat produced in a conductor carrying an electric is
A
Inversely proportional to the current and the resistance
B
Directly proportional to the current, resistance and the time.
C
Inversely proportional to the square of the resistance, current and the time.
D
Directly proportional to the square of the current, the resistance and the time.
Physics JAMB 1992 Q44 ✓ Answer: B
The maximum permissible current through a galvanometer G of internal resistance 10Ù is 0.05A. A resistance R is used to convert G into a voltmeter with a maximum reading of 100V. Find the value of R and how it is connected to G.
A
20,000 ohms in parallel
B
19,990 ohms in series
C
1,990 ohms in series
D
100 ohms in series
Physics JAMB 1992 Q45 ✓ Answer: B
In alternating current theory, the unites of impedance, r.m.s. voltage and resonance frequency are respectively equal to
A
Volt, ampere and hertz
B
Ohm, volt and hertz
C
Watt, ohm and radian
D
Ohm, hertz and joule.
Physics JAMB 1992 Q46 ✓ Answer: B
In A.C. circuit theory, the root mean square (r.m.s.) current, Irms, and the peak (maximum) current I0 are [PAGE 50] related by
A
I0 = Irms/ 2
B
Irms = I0/ 2
C
Irms = 1/ I0 2
D
I0 = 1/Irms 2