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2023 - JAMB Physics Past Questions & Answers Cbt Practice

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1. An open-tube mercury manometer is used to measure the pressure in a gas tank. When the atmospheric pressure is 101,325 Pa, what is the absolute pressure in Pa in the tank if the height of the mercury in the open tube is 25 cm higher

a) 165,238 Pa

b) 122,364 Pa

c) 108,986 Pa

d) 134,645 Pa

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2. The surface temperature of a swimming pool on a warm day is 25oC and the temperature at the bottom is 15oC. If the swimming pool has a surface area of 620 m2 and a depth of 1.5m. Find the rate at which energy is transferred by conduction from the surface to the bottom of the swimming pool.

[Thermal conductivity of water (k) = 0.6071 Wm-1K-1]

a) 250kw

b) 300kw

c) 2.5kw

d) 3.0kw

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3. Rainbow formation is as a result of the combination of which of the following phenomena?
(i) Reflection
(ii) Dispersion
(iii) Total internal reflection
(iv) Refraction

a) (i), (ii) and (iv) only

b) (ii) and (iv) only

c) (i), (iii) and (iv) only

d) (ii), (iii) and (iv) only

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4. The number of holes in an intrinsic semiconductor

a) is equal to the number of free electrons

b) is greater than the number of free electrons

c) is less than the number of free electrons

d) is not equal to the number of free electrons

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5. Which of the following liquids has the highest surface tension?

a) Water

b) Soapy water

c) Mercury

d) Oil

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6. A 35 kΩ is connected in series with a resistance of 40 kΩ. What resistance R must be connected in parallel with the combination so that the equivalent resistance is equal to 25 kΩ?

a) 37.5 kΩ

b) 45.5 kΩ

c) 40 kΩ

d) 30 kΩ

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7. The near point of a patient\'s eye is 50.0 cm. What power (in diopters) must a corrective lens have to enable the eye to see clearly an object 25.0 cm away?

a) 0.5 diopters

b) 2 diopters

c) 3 diopters

d) 2.5 diopters

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8. An explosion occurs at an altitude of 312 m above the ground. If the air temperature is -10.00°C, how long does it take the sound to reach the ground?

[velocity of sound at 0°c = 331 ms-1]

a) 0.96s

b) 0.94s

c) 0.95s

d) 0.93s

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9. A step-down transformer is used on a 2.2 kV line to deliver 110 V. How many turns are on the primary windings if the secondary has 25 turns?

a) 250

b) 20

c) 500

d) 200

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10. Which of the following materials is a good insulator?

a) Silver

b) Rubber

c) Water

d) Copper

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11. How much net work is required to accelerate a 1200 kg car from 10ms¯¹ to 15ms¯¹

a) 7.5×10⁴j

b) 1.95×10⁵

c) 1.35×10⁴

d) 7.5×10⁴j

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12. Which of the following is NOT an example of elementary modern physics?

a) Nuclear physics

b) Quantum mechanics

c) Special relativity

d) Classical mechanics

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13. On a particular hot day, the temperature is 40°C and the partial pressure of water vapor in the air is 38.8 mmHg. What is the relative humidity?

a) 42

b) 70

c) 62

d) 80

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14. Three forces with magnitudes 16 N, 12 N and 21 N are shown in the diagram below. Determine the magnitude of their resultant force and angle with the x-axis

a) 7.63N,29°

b) 7.63N,61°

c) 8.71N,29°

d) 8.71N,61°

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15. A generator manufacturing company accidentally made an AC generator instead of a DC generator. To fix this error,

a) the number of turns of the armature coil needs to be decreased

b) the slip rings should be replaced with split rings

c) the split rings should be replaced with slip rings

d) the magnetic field needs to be made stronger

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16. A lorry accelerates uniformly in a straight line with acceleration of 4ms¯² and covers a distance of 250 m in a time interval of 10 s. How far will it travel in the next 10 s?

a) 800

b) 650

c) 250

d) 900

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17. The half life of a radioactive material is 12 days. Calculate the decay constant.

a) 0.8663 day¯¹

b) 0.04331 day¯¹

c) 0.05775 day¯¹

d) 0.17325 day¯¹

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18. What is the name of the model of the atom that describes electrons as orbiting the nucleus in specific energy levels?

a) Dalton model

b) Thomson model

c) Bohr model

d) Rutherford model

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19. A simple pendulum, has a period of 5.77 seconds. When the pendulum is shortened by 3 m, the period is 4.60 seconds. Calculate the new length of the pendulum

a) 4.87 m

b) 5.23 m

c) 7.26 m

d) 6.42 m

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20. A missile is launched with a speed of 75 ms-1 at an angle of 22° above the surface of a warship. Find the horizontal range achieved by the missile. Ignore the effects of air resistance.

[Take g = 10 ms-1]

a) 136 m

b) 271 m

c) 391 m

d) 195

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21. The branch of physics that deals with the motion of objects and the forces acting on them is called:

a) Mechanics

b) Quantum mechanics

c) Thermodynamics

d) Electromagnetism

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22. A relative density bottle has a mass of 19 g when empty. When it is completely filled with water, its mass is 66 g. What will be its mass if completely filled with alcohol of relative density 0.8?

a) 37.6 g

b) 56.6

c) 52.8 g

d) 47 g

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23. Which of the following thermometers measures temperature from the thermal radiation emitted by objects?

a) Constant pressure gas thermometer

b) Pyrometer thermometer

c) Platinum resistance thermometer

d) Thermocouple thermometer

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24. When light of a certain frequency is incident on a metal surface, no photoelectrons are emitted. If the frequency of the light is increased, what happens to the stopping potential?

a) The stopping potential decreases.

b) The stopping potential does not change.

c) The stopping potential increases.

d) The stopping potential can either increase or decrease, depending on the intensity of the light.

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25. Which of the following thermometers measures temperature from the thermal radiation emitted by objects?

a) Thermocouple thermometer

b) Pyrometer thermometer

c) Platinum resistance thermometer

d) Constant pressure gas thermometer

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26. The pinhole camera works on

a) the principle of total internal reflection of light

b) the principle of the reversibility of light

c) Huygen’s principle

d) the principle of the rectilinear propagation of light

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27. The terminals of a battery of emf 24.0 V and internal resistance of 1.0 Ω is connected to an external resistor 5.0 Ω. Find the terminal p.d.

a) 18.0V

b) 12.0V

c) 20.0V

d) 16.0V

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28. A charge of 4.6×10−5C is placed in an electric field of intensity 3.2×10⁴ Vm−1. What is the force acting on the electron?

a) 2.5 N

b) 3.7 N

c) 4.2 N

d) 1.5 N

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29. Rainbow formation is as a result of the combination of which of the following phenomena?
(i) Reflection
(ii) Dispersion
(iii) Total internal reflection
(iv) Refraction

a) (i), (ii) and (iv) only

b) (ii) and (iv) only

c) (i), (iii) and (iv) only

d) (ii), (iii) and (iv) only

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30. The property of wave shown in the diagram above is?

a) Diffraction

b) Interference

c) Polarisation

d) Refraction

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