⚛️ 1998

JAMB Physics 1998 past questions

28 questions from the 1998 JAMB UTME Physics paper. Free, with answers where available.

Practice with CBT mock → All Physics years
Physics JAMB 1998 Q4 ✓ Answer: A
The figure above represents a frictionless pulley system in which a weight W is in equilibrium with a weight of 40N. Find the value of W
A
13.1 N
B
20.0 N
C
40.0 N
D
80.0 N
Physics JAMB 1998 Q5 ✓ Answer: A
The diagram above shows a solid figure with base PQ and centre gravity G on an inclined plane. Which of the following statements is correct?
A
The solid will fall over if the vertical line through G lies outside the base.
B
The solid will fall over if the vertical line through G lines inside the base.
C
The solid will not fall over if the vertical line through G lies outside the base.
D
The solid can never fall over. Physics 1999
Physics JAMB 1998 Q7 ✓ Answer: D
In an experiment, a constant force is applied to several masses (m) and the corresponding accelerations (a) are measured. Which of the following graphs correctly represents the experiment?
A
III and IV only
B
II and IV only
C
I and III only
D
I and II only
Physics JAMB 1998 Q12 ✓ Answer: B
In a wheel and axle mechanism, the diameters of the wheel and axle are 40cm and 8cm respectively. Given that the machine is 80% efficient, what effort is required to lift a load of 100N?
A
20 N
B
25 N
C
50 N
D
80 N
Physics JAMB 1998 Q13 ✓ Answer: C
The tendon in a man’s leg is 0.01m long. If a force of 5N stretches the tendon by 2.0 x 10-5m, calculate the strain on the muscle.
A
5 x 106
B
5 x 102
C
2 x 10-3
D
2 x 10-7
Physics JAMB 1998 Q14 ✓ Answer: B
Which of these statements are correct for the pressures in liquids? I Pressure in a liquid at a point acts equally in all directions II Pressure increases with depth III Pressure at a depth depends on the shape of the container. IV Pressures at the same depth in different liquids are proportional to the densities of the liquids.
A
I, II and III only
B
I, II and IV only
C
I, III and Iv only
D
II, III and IV only.
Physics JAMB 1998 Q15 ✓ Answer: B
The atmospheric pressure due to water is 1.3 x 106 Nm-2. What is the total pressure at the bottom of an ocean 10m deep?
A
1.3 x 107 Nm-2
B
1.4 x 106 Nm-2
C
1.4 x 105 Nm-2
D
1.0 x 105 Nm-2
Physics JAMB 1998 Q18 ✓ Answer: C
The linear expansivity of brass is 2 x 10-5C-1. If the volume of a piece of brass is 15.00 cm3 at 00C, what is the volume at 1000C?
A
16.03cm3
B
16.00cm3
C
15.09cm3
D
15.03cm3
Physics JAMB 1998 Q21 ✓ Answer: C
How many grams of water at 170C must be added to 42g of ice at 00C to melt the ice completely?
A
200g
B
300g
C
320g
D
400g [Specific latent heat of fusion of ice = 3.4 x 105Jkg-1, Specific heat capacity of water = 4200 Jkg-1K-1]
Physics JAMB 1998 Q23 ✓ Answer: D
One valid assumption of the kineic theory of gases is that
A
the molecules of a gas are constantly in state of motion and the number of collisions remain constant.
B
The number of molecules of gas increases with increasing pressure
C
As the temperature increases, the number of collisions made by the gas molecules remain constant.
D
The molecules of gas are all identical and are very small in size.
Physics JAMB 1998 Q24 ✓ Answer: A
The physical properties of sound waves can best be described by
A
Reflection and diffraction
B
Polarization and reflection
C
Polarization and diffraction
D
Polarization and refraction
Physics JAMB 1998 Q25 ✓ Answer: C
The velocity of a sound wave at 270C is 360ms-1. Its velocity at 1270C is
A
120 3ms-1
B
240ms-1
C
240 3ms-1
D
720 3ms-1 [PAGE 71]
Physics JAMB 1998 Q26 ✓ Answer: B
In a closed organ pipe producing a musical note, an antinode will always be produced at
A
The closed end
B
The open end
C
The middle
D
All the parts of the pipe.
Physics JAMB 1998 Q28 ✓ Answer: C
In a resonance tube experiment, if the fundamental frequency of the vibrating air column is 280Hz, the frequency of the third overtones is
A
70Hz
B
840Hz
C
1 120Hz
D
1 960Hz
Physics JAMB 1998 Q29 ✓ Answer: B
An object O lies at a distance m in front of a concave mirror of the focal length f. If m<f, then the final image obtained will be
A
Virtual and diminished
B
Magnified and erect
C
Real and inverted
D
Diminished and erect.
Physics JAMB 1998 Q31 ✓ Answer: D
The most suitable type of mirror used for the construction of a searchlight is the
A
Concave mirror
B
Convex mirror
C
Spherical mirror
D
Parabolic mirror.
Physics JAMB 1998 Q32 ✓ Answer: C
The displacement d produced in a glass block of thickness t and refractive index n when an object is viewed through it is
A
t – n
B
t(1 + 1/n)
C
t(1 – 1/n)
D
t(1/n – 1)
Physics JAMB 1998 Q35 ✓ Answer: B
Which of the following are true about infra-red radiation? I It is invisible II It is called heat ray III Its frequency is higher than that of blues light IV It travels as a transverse wave.
A
I, II, III and IV.
B
I, II and Iv only
C
I, III and IV only.
D
II, III and IV only.
Physics JAMB 1998 Q36 ✓ Answer: C
The force of repulsion between two point positive charges 5uC and 8uC separated at a distance of 0.02m apart is
A
1.8 x 10-10N
B
9.0 x 10-8N
C
9.0 x 102N
D
4.5 x 103N
Physics JAMB 1998 Q37 ✓ Answer: A
An ebonite rod rubbed with fur attracts a glass rod rubbed with silk because
A
Ebonite has a negative charge while glass has a positive charge
B
Ebonite has a positive charge while glass has a negative charge
C
Both have negative charges
D
Both have positive charges.
Physics JAMB 1998 Q40 ✓ Answer: B
The total resistance measured at PQ in the diagram above is
A
18.0 Ohms
B
11.0 Ohms
C
4.0 Ohms
D
2.0 Ohms
Physics JAMB 1998 Q41 ✓ Answer: C
Find the work done in moving a 2C charges between two points X and Y in an electric field if the potential difference is 100 volts.
A
50J
B
100J
C
200J
D
400J
Physics JAMB 1998 Q43 ✓ Answer: A
The iron core of an induction coil is made from bundles of wires so as to
A
Minimize eddy-currents
B
Generate eddy-currents
C
Prevent sparking at the contact breaker
D
Get the greatest possible secondary voltage.
Physics JAMB 1998 Q44 ✓ Answer: D
Electricity is supplied to a school along a cable of total resistance 0.5 Ù with the maximum current drawn from the mains as 100A. the maximum energy dissipated as heat for 1hr is
A
3.6 x 103J
B
5.0 x 103J
C
3.0 x 105J
D
1.8 x 107J
Physics JAMB 1998 Q45 ✓ Answer: C
In the a.c. circuit diagram above, the resonance frequency is
A
5000ðHz
B
2500ðHz
C
5000/ðHz
D
2500/ðHz
Physics JAMB 1998 Q47 ✓ Answer: C
The electrochemical equivalent of metal is 1.3 x 10- 7kgC-1. The mass of the metal which 2.0 x 104C of electricity will deposit from a suitable electrolyte is
A
6.5 x 10-2kg
B
2.6 x 10-2kg
C
6.5 x 10-3kg
D
2.6 x 10-3kg
Physics JAMB 1998 Q49 ✓ Answer: D
In a nuclear fusion experiment, the loss of mass amounts to 1.0 x 10-6kg. The amount of energy obtained from the fusion is
A
3.0 x 10-4J
B
3.0 x 10-1J
C
9.0 x 104J
D
9.0 x 1010J [Speed of light = 3.0 x 108ms-1]
Physics JAMB 1998 Q50 ✓ Answer: A
In photoelectric effect, electrons will leave the metal surface when illuminated by light of appropriate frequency if the photon energy is
A
Greater than the work function.
B
Less than the work function
C
Equal to the work function
D
Equal to the maximum kinetic energy of the electrons. [PAGE 73]