2024 JAMB PHYSICS: 2004 JAMB CBT Physics (Phy.) Questions and Answers (1629)
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PHYSICS 2004 TYPE: S | Physics 2004/2023which of the following expressions gives the linear 7. If u is the object distance and v the image distance, |
1. magnification produced by a convex lens of focal length f?
The refractive index of the medium M in the diagram above is A 2 B. 1 C. 2 3 D. 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. Cylindrical mirrors B. B. Parabolic mirrors. C. C. spherical mirrors
D. Plane mirrors.
3. A person can focus an object only when it lies within 200cm from him. Which spectacles should 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 of minimum deviation for a ray which is refracted through an equiangular prism of refractive index 1.4.
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 is the 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 is the 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
A. 290 B. 600 III The recoil of a gun
C. 990 D. 900 IV A person walking
6. What happens to the rays in a parallel beam of light?
A. They diverges as they travel
B. They meet at infinity
C. They intersect
D. They converge as they travel
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. If the force exerted on the load piston is 400N, the area of the 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. If the 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 shows forces 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 108s B. 1.00 x 10-7s
C. 1.00 x 107s D. 6.93 x 107s
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 He is
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 semiconductors to 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 electrons in 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. 2.017U B. 2 0.033U
C. 4.033U D. 0.330U
[atomic mass of proton = 1.00783U, atomic mass 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
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. Commutator should 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.
31. 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 completely melted 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. If a force of 50N stretches a wire from 20m to 20.01m, what is the amount of force required to stretch the same material from 20m to 20.05m?
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.
The phase difference between waves P and Q in the diagram above is
A. B. 2
C. D.
4
38. Metal rods of length 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 the material = 2.0 x 10-5K-1]
39. A 50W electric heater is used to heat a metal block of mass 5kg. If in 10minutes, a temperature rise of 120C is achieved, the specific heat capacity of the metal is
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 and V. B. II, IV and V
C. I and IV D. I, III and IV
41. The instrument used for securing a large number of similar charges by induction is called
A. Capacitor B. Electrophorus
C. Electroscope D. Proof-plane
42. A steady current 2A flows in a coil of e.m.f. 12V for 0.4s. A back e.m.f. of 3V was induced 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 flows through 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 changes in 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 are more penetrating than gamma rays.
45.
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, the material should 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 appliances in homes are normally earthed 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 are maintained at a higher
p.d. than the earth
D. The appliances are maintained at a lower
p.d. than the earth
49. A cell whose internal resistance 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 give minimum capacitance is
A. 0.3uF B. 1.0uF
C. 0.1uF D. 0.5uF
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