Education: Jamb 2023 Common Interesting Fact about Physics

PHYSICS COMMON FACTS FOR JAMB 2023.

1) The classification of waves are electromagnetic waves And mechanical waves.

2) Stationary Wave occurs when two interfering waves of the same amplitude and frequency travel in the opposite direction.

3) The velocity of Sound In:

Air is 332m/s

Water (Liquid) is 1435m/s

Iron (Solid) is 5000m/s

4) The velocity of the Echo is equal to the total distance traveled by the sound divided by the time taken.

5) Sound quality depends on the number of overtones or harmonics. It makes it possible to distinguish between two instruments playing the same note.

6) Vibration can either be free, forced, or resonance.

7) An eclipse occurs due to the travel of light in a straight line.

8) The application of plane mirrors is Periscope, Kaleidoscope, and Sextant.

9) Refraction occurs at a constant frequency.

10) Hydrogen spectrum has all colors of white light, Sodium vapor has a yellow line (orange) and Mercury vapor has Blue and Green spectra.

11) Another word for electrolysis is the chemical effect of current.

12) Passage of current through liquid doesn’t obey Ohms law.

13) Magnetic fields are oval in shape.

14) The angle of dip is 90 degrees at the magnetic poles and zero at the equator.

15) The strength of the Magnet is greatest at the pole.

16) All electric charges are multiples of the charges of an electron.

17) Factors affecting capacitance are the Area of plates, the distance between the plates, and dielectrics between the plates.

18) Examples of dielectric materials are Paraffin wax, Polythene, Ebonite, and Glass.

19) Sliding friction is less than limiting friction.

20) EMF is the algebraic sum of potential differences acting in a circuit.

Physics hot points

Hot Topics in Jamb Physics (20 to 30)

21) Electromagnetism is the production of current from a Magnet.

22) In a closed circuit, the induced EMF gives rise to an induced current.

23) Eddy current is used in damping moving coils, speedometers,,, and induction coils.

24) The transformer steps up or steps down the voltage at the same frequency.

25) The Inductor finds application in choke making industry.

26) Choke is used for varying currents.

27) The induced voltage is equal to the rate of change of magnetic flux.

28) Solar cells convert sunlight energy directly into electrical energy.

29) Local action is caused by the impurity of zinc plate.

30) Eddy current is reduced by lamination.

Hot Key Points In Jamb UTME Physics (30 to 40)

31) The induction coil is used to step up the voltage in the DC circuit.

32) The generator operates based on the principle of self-induction.

33) DC doesn’t oscillate and as such does not have a frequency.

34) Telephone receiver or earpiece works on the principle of the magnetic effect of current.

35) Plane mirrors do not enlarge or reduce the size of the object. Object size is the same as image size.

36) Factors affecting resistance are:

Length of the conductor.

Area of the conductor.

Temperature and

Type of material used.

37) Triangular prism with two convex lenses is used to produce a pure spectrum.

38) If light energy is less than the work function, no electron will be emitted,,, and vice versa.

39) Work function is the energy that can produce threshold frequency (W=hf).

40) The uncertainty principle only works for atoms and not irons.

Likely Jamb physics questions to Note (40 to 50)

41) The applications of total internal reflection are Mirage and Fish view underwater.

42) Binding energy is the reason for mass defect.

43) Bismuth is diamagnetic.

44) Current is the rate of flow of charge.

45) Kirchoff’s current law states that the algebraic sum of currents flowing into the circuit is equal to

46) Kirchoff’s voltage law states that the sum of all the voltages around the circuit loop is equal to zero.

47) Example of refrigerants is Ammonia and Ethyl Chloride.

48) Kaleidoscope is designed to obtain different color patterns.

49) To convert a Galvanometer to Ammeter, a low resistance called a shunt is connected in parallel with the meter.

50) As temperature increases, the speed of sound increases.

Hot 2023 Key Points In Physics Part 2

51. The ground is always cold at night because the earth radiates heat to the atmosphere at night.

52. The escape velocity of an object from the gravitational field of the planet increases with the mass of the object and also increases with the mass of the planet. Escape velocity, v =√2Gmp/rp= √2gprp

53. A transverse wave and a longitudinal wave traveling in the same direction in a medium differ essentially in their direction of vibration of the particles of the medium.

54. The different time rates of the flow of fluid are due to viscous force.

55. The electrical property of germanium can be altered drastically by the addition of impurities. The process is referred to as doping.

56. The wave property which can be used to confirm water to be a transverse wave is Polarization.

57. The output voltage is through the base in a common emitter configuration.

58. When a ball rolls on smooth level ground, the motion of its center is Translational.

59. A vapor whose molecules are in dynamic equilibrium with those of its own liquid is said to be Saturated.

60. In a good thermos flask, the main cause of heat loss is the silvered walls and shiny metals.

61. The north pole of a magnet can never be separated from the south pole because of a property known as a magnetic dipole.

62. An iron spoon placed inside hot tea becomes hot due to the conduction of heat from the tea through the surface of the spoon.

63. A constant-volume gas thermometer operates under which gas law? Pressure law.

64. A vapor whose molecules are in dynamic equilibrium with those of its own liquid is said to be Saturated.

65. Red light travels faster than blue light when both of them pass through a glass prism because the refractive index of blue light is greater than that of red light.

66. Heat reaches the food which is being cooked in a saucepan chiefly by Conduction and Convection.

67. The force that tends to pull an object undergoing circular motion towards the center is Centripetal.

68. Radiation is energy traveling through space.

69. A body cannot undergo “relative motion”. Relative motion usually involves two bodies.

70. The type of wave emitted by a loudspeaker is Longitudinal.

71. The prolongation of sound wave after which the source has been withdrawn is called Reverberation.

72. The mouthpiece of a telephone primarily converts sound energy into Electrical.

73. The quality of a musical note depends on what? Harmonics

74. The resultant force in a couple is Zero

74. The most suitable instrument for measuring the diameter of a thin wire accurately is a micrometer screw gauge.

75. A rainbow viewed through a blue sheet of glass will appear blue.

76. The slope of a straight-line velocity-time graph represents uniform acceleration.

77. The unity cycle per second is the same as hertz.

78. Trombone is a wind instrument.

79. A chemical balance is used for measuring mass

80. Sound waves cannot be polarized.