• 45 JAMB PHYSICS KEY POINTS

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45 JAMB PHYSICS KEY POINTS

(1) Example of vector quantity – velocity, acceleration, moment, displacement, force, electric field intensity, magnetic flux

(2) Examples of scalar quantity – work, time, mass, distance, energy, pressure, speed, temperature

(3) The resultant of two forces acting on an object is maximum if the angle between them is – 0^o

(4) The terrestrial telescope has one extra lens more than the astronomical telescope. The extra lens is for -erection of the image

(5) What is the angle of dip at the magnetic equator? – 0^o

(6) At resonance, the phase angle in an a.c. circuit  is – 0^o

(7) The process of energy production in the sun is – Nuclear fusion

(8) A transistor functions mainly as a – switch and amplifier

(9) Energy losses through eddy currents are reduced by using – insulated soft iron wires

(10) The effect of a particle in a fluid attaining its terminal velocity is that the – weight is equal to the retarding force

(11) Water is a poor thermometric liquid because it – wet glass

(12) To produce an enlarged and erect image with a concave mirror, the object must be positioned – between the principal focus and the pole

(13) The phenomenon that makes sound persist when its source has been removed is known as – reverberation

(14) The colours seen in soap bubbles are due to – dispersion

(15) The electromagnetic wave that can produce a heating effect on the environment is – infra-red

(16) Pure silicon can be converted to a p-type material by adding a controlled amount of – trivalent atoms

(17) The particle that is responsible for nuclear fission in a nuclear reactor is – neutron

(18) The carbon-granule microphone works on the principle of change in – resistance

(19) The phenomenon whereby the water droplets in the atmosphere combine with dust particles in the air to reduce visibility is – fog

(20) In a semi-conductor junction diode, as the depletion or barrier layer is forward biased, the layer – narrows

(21) As the pressure of a fluid increases, its viscosity – increases

(22) To change a d.c dynamo to a.c dynamo – commutator should be replaced with slip rings

(23) Transverse waves can be distinguished from longitudinal waves using the characteristic of – polarization

(24) The North pole of a magnet can never be separated from the South pole because of a property known as – magnetic dipole

(25) The charge carriers in gases are – electrons and ions

(26) The ray which causes gas molecules to glow is known as – cathode ray

(27) Lenz’s law is a law of the conservation of – Energy

(28) The phenomenon of light bending round an obstacle is – diffraction

(29) The instrument that measures both a.c. and d.c. is – moving iron ammeter

(30) What is the leat possible error in using a rule graduated in centimeters? – 0.5 cm

More Questions to be expected in JAMB Physics

(31) The object moves with uniform speed round a circle. Its acceleration has – constant magnitude and varying direction

(32) The motion of a moving skin of a talking drum can rightly be described as – oscillatory

(33) Isotopes are nuclei which has? – the same atomic number but different mass number

(34) The net charge on the atom is zero becuase – the neutrons form shield around the charged protons

(35) Gases conduct electricity under – low pressure and high voltage

(36) For resonance to occur in a.c circuit containing a resistor, capacitor and inductor – when the frequency source is such that the reactance of the capacitor is equal to the inductive reactance

(37) In a purely inductive circuit, the current – lags behind the voltage in phase by 90 degree

(38) The principle of operation of an induction coil is based on – Faraday’s law

(39) A dynamo primarily converts – mechanical energy into electrical energy

(40) To convert a milliameter to an ammeter – a low resistance in series is required

(41) In order to convert a galvanometer into an ammeter – a low resistance shunt is connected in parallel

(42) If two parallel conductors carry currents flowing in the same direction, the conductors will – attract each other

(43) A calibrated potentiometer is used to measure the emf of a cell because the – potentiometer takes no current from the cell

(44) The resistance of an open series circuit is – infinite

(45) When white light is dispersed by a spectrometer, the component having the shortest wavelength is – violet.