JAMB Physics 2024

What is the force on a segment of wire that is 0.5m long and has a current of 2A, when placed in a magnetic field of 2T at and angle of 300 to the field?

A) 1.0N B) 2.0N C) 0.1N D) 0.2N

Correct Answer: A) 1.0N

The mode of heat transfer that is electromagnetic in nature is _____

A) Conduction B) Evaporation C) Convection D) Radiation

Correct Answer: D) Radiation

The condition for resonance to occur in RLC series circuit is _____

A) When the angular frequency of the applied voltage is equal to the natural angular frequency of the circuit B) When the angular frequency of the apply voltage is greater than the natural angular frequency of the circuit C) When the angular frequency of the applied voltage is less than the natural angular frequency of the circuit D) When the angular frequency of the applied voltage is zero

Correct Answer: A) When the angular frequency of the applied voltage is equal to the natural angular frequency of the circuit

A solid weighs 10.5N in air and 5.5N when immersed in a liquid of density 900kgm−3. Calculate the volume of the solid. g=10m/s²

A) 1.17×10−4m³ B) 5.56×10−4m³ C) 3.24×10−4m³ D) 2.24×10−4m³

Correct Answer: B) 5.56×10−4m³

A uniform metre rule AB balanced on a knife edge 60cm from end B when a load of 33g is kept 10cm away from the end A, what is the weight of the metre rule?

A) 40g B) 55g C) 66g D) 37g

Correct Answer: C) 66g

A paricle in a simple harmonic motion while passing through mean position will have

A) Minimum kinetic energy and maximum potential energy B) Maximum potential energy and minimum kinetic energy C) Minimum kinetic energy and minimum potential energy D) Maximum kinetic energy and minimum potential energy

Correct Answer: D) Maximum kinetic energy and minimum potential energy

A pin floats on water due to the phenomenon of?

A) Viscosity in fluid B) Surface tension C) Capillary tension D) Gravitation

Correct Answer: B) Surface tension

Which of the statements above is/are true for an electric motor?
(i) It converts electrical energy into mechanical energy (ii) It generates electricity (iii) It is based on the principle of electromagnetic induction (iv) It follows Fleming's left hand rule.

A) (i) only B) (i) and (ii) only C) (i), (ii) and (iii) only D) (i) and (iv) only

Correct Answer: D) (i) and (iv) only

A thick glass tumbler cracks when hot water is poured into it because of?

A) Anomalous expansion of water B) Uneven expansion of the glass tumbler C) Thermal expansion of water D) Even expansion of the glass tumbler

Correct Answer: B) Uneven expansion of the glass tumbler

which of the following is the function of a p.n junction diode of a semiconductor device?

A) It can be used to convert Alternating Current (AC) to direct current (DC) B) It can be used to convert Direct Current (DC) to Alternating Current C) It can be used to amplify the electric current in a circuit D) It can be used to step down the electric current in a circuit

Correct Answer: A) It can be used to convert Alternating Current (AC) to direct current (DC)

Which of the following is true of a particle in stable equilibrium?

A) Potential energy is constant B) Potential energy is maximum C) Potential energy is minimum D) Potential energy is zero

Correct Answer: C) Potential energy is minimum

Determine the equivalent capacitance of the capacitors shown in the circuit

A) 1.20μF B) 6.00μF C) 0.55μF D) 1.33μF

Correct Answer: D) 1.33μF

The power factor of a series R.L.C. circuit at resonance is

A) 0 B) 1 C) π D) π/2

Correct Answer: B) 1

In the given circuit, what is the ammeter reading given that the voltages across the capacitor and inductor are 300 volts each

A) 1.2A B) 2.2A C) 3.2A D) 0.2A

Correct Answer: B) 2.2A

One of these is not an example of a mechanical wave?

A) Sound waves B) Water waves C) Light waves D) Seismic wave

Correct Answer: C) Light waves

Which of the following is a scalar quantity?

A) Electric potential B) Electric field C) Angular momentum D) Linear momentum

Correct Answer: A) Electric potential

Given three capacitors each of capitance C. The resultant capacitance of 2C/3 can be obtained by

A) Combining all in parallel B) All in series C) Two of them in series and in parallel with the third D) Two in parallel and third in series with this combination

Correct Answer: D) Two in parallel and third in series with this combination

If two plane mirrors are positioned side by side, the number of images formed is 8. At what angle are they positioned?

A) 30° B) 40° C) 60° D) 90°

Correct Answer: B) 40°

If the half life of a particle is 4.5 days. How long will it decay 3/4 of its original mass?

A) 9 days B) 12 days C) 15 days D) 21 days

Correct Answer: A) 9 days

A transformer core is laminated to reduce _____

A) Hysteresis loss B) Copper loss C) Eddy current loss D) Stray and di-electric losses

Correct Answer: C) Eddy current loss

A glass rod is charged when rubbed with silk cloth because

A) It transfers negative charge B) It transfers positive charges C) It accepts negative charges D) It accepts in positive changes

Correct Answer: A) It transfers negative charge

Addition of trivalent impurity to a semiconductor

A) Increases the number of holes B) Decreases the number of holes C) Increases the number of free electron D) Decreases the number of free electrons

Correct Answer: A) Increases the number of holes

A charge of magnitude 1.6×10^-19C is placed in a uniform electric field of intensity 1,200V/m. Calculate its acceleration if the mass of the charge is 9.1×10^-31kg

A) 2.11×10¹² m/s² B) 2.11×10¹⁴ m/s² C) 6.83×10¹² m/s² D) 6.83×10¹⁴ m/s²

Correct Answer: B) 2.11×10¹⁴ m/s²

The defect of the eye lens which occurs when the ciliary muscles are weak is called _____

A) Long-sightedness B) Short sightedness C) Presbyopia D) Astigmatism

Correct Answer: C) Presbyopia

A light of 6.22eV is incident on a cadmium surface. If a stopping voltage of 2.1eV is required to reduce the photocurrent to zero. Calculate the work function of the cadmium in electron volt.

A) 4.07eV B) 2.15eV C) 6.22eV D) 8.37eV

Correct Answer: A) 4.07eV

The fundamental frequency of an open organ pipe is the same as that of the second overtone of a closed organ pipe of length 0.2m. What is the length of the open organ pipe?

A) 0.132m B) 0.160m C) 0.125m D) 0.080m

Correct Answer: D) 0.080m

What is the maximum possible wavelength in an open organ pipe of length a cm

A) a cm B) 2a cm C) 3a cm D) 4a cm

Correct Answer: B) 2a cm

Mercury is used as a thermometric substance because (i) its specific heat is low (ii) does not wet glass (iii) It is opaque

A) i only B) i and ii only C) ii and iii only D) i, ii and iii

Correct Answer: D) i, ii and iii

The magnetic field inside a solenoid is _____

A) Non-uniform B) Uniform C) Zero D) Weak

Correct Answer: B) Uniform

A gun with a muzzle velocity of 500m/s shoots a bullet at a bird 50m. To hit the Target, the gun should be aimed [take g=10m/s²]

A) 5cm high above the bird B) 10cm high above the bird C) Directly towards D) 15cm high above the level of the bird

Correct Answer: A) 5cm high above the bird

If the distance between two suspended masses 50kg each is quadrupled, the gravitational force of attraction between them is

A) Reduced by four B) Increased by four C) Increased by sixteen D) Reduced by sixteen

Correct Answer: D) Reduced by sixteen

In a simple machine, the variation of the efficiency with load is _____

A) A parabola B) A straight line C) A hyperbola D) Logarithmic

Correct Answer: A) A parabola

Binding energy is _____

A) The amount of energy released when protons change energy level B) The amount of energy released when electrons change energy levels C) The amount of energy required to break a nucleus apart into protons and neutrons D) The amount of energy required to to break a nucleus apart into protons and electrons

Correct Answer: C) The amount of energy required to break a nucleus apart into protons and neutrons

If the heat capacity of a 100g of a substance is 3000JK^-1 what would be the heat capacity of of 10g of the substance?

A) 30JK^-1 B) 300JK^-1 C) 30,000JK^-1 D) 3JK^-1

Correct Answer: B) 300JK^-1

Wooden ladles are commonly used domestically to scoop hot soup because of its

A) Good insulation of electricity B) Good insulation of heat and electricity C) Bad conduction of heat and electricity D) Good insulation of heat

Correct Answer: D) Good insulation of heat

Which of these thermometers uses the volume of a fixed mass of liquid as its thermometric properties?

A) Mercury-in-glass thermometer B) Thermocouple thermometer C) Constant-volume of gas thermometer D) Resistance thermometer

Correct Answer: A) Mercury-in-glass thermometer

As pressure is increased,

A) The melting point of the ice decreases B) The melting point of the ice increases C) The boiling point of the water increases D) No change is observed in the melting point of ice or the boiling point of water

Correct Answer: A) The melting point of the ice decreases

Which of the following statements about the gamma ray is/are true? (i) It carries a negative charge (ii) It can be deflected by both magnetic and electric field (iii) It can be stopped by a sheet of paper (iv) It has zero rest mass and a neutral charge

A) (i) only B) (i) and (ii) only C) (ii) and (iv) only D) (iv) only

Correct Answer: D) (iv) only

A cyclist of mass 30KG exerts a force of 250N to move his bicycle. The acceleration produced is 4m/s². What is the frictional force between the road and the tires

A) 200N B) 120N C) 130N D) 180N

Correct Answer: C) 130N

The temperature of land rises more quickly than that of the sea because the specific heat of the soil is

A) More than that of water B) Less than that of water C) Equal to that of water D) Negligible

Correct Answer: B) Less than that of water