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2022 - JAMB Physics Past Questions & Answers Cbt Practice

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1. Water is not a good thermometric liquid because it___?

a) expands unevenly between 0 ºC and 4 ºC

b) wets glass

c) has low freezing point

d) maintains fixed density

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2. Which component of the fibre-optic connector has a provision of entry for the fibre along with the fixation to connector housing?

a) cable

b) ferrule

c) couplers

d) connector housing

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3. When the plate surface area of a capacitor increases, ___?

a) the capacitance is unaffected

b) the capacitance increases

c) the voltage can withstand increase

d) the capacitance decreases

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4. A car starts from rest and covers a distance of 40 m in 10 s. Calculate the magnitude of its acceleration.

a) 0.80 ms-²

b) 0.25 ms-²

c) 3.20 ms-²

d) 4.00 ms-²

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5. For a pear-shaped conductor shown, the concentration of charge on the outside is highest at

a) z

b) x

c) k

d) y

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6. A cell whose internal resistance is 0.55Ώ
delivers a current of 4 A to an external resistor. What is the lost voltage of the cell?

a) 4.00 V

b) 0.15 V

c) 8.00 V

d) 2.20 V

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7. The most suitable instrument to view the sun is ___

a) telescope

b) sun meter

c) stroboscope

d) helioscope

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8. Which of the following is a derived unit?

a) Newton

b) Second

c) Kilogram

d) Metre

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9. Consider the wave equation y = 5mm sin [1cm¯¹x - 60s¯¹t]. The wave number is?

a) 10cm¯¹

b) 2cm¯¹

c) 1.0cm¯¹

d) 0.1 cm¯¹

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10. Which of these is a second-class lever?

a) wheelbarrow

b) sugar tongs

c) plier

d) claw hammer

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11. In the formation of sea breeze, the wind blows from?

a) sea to land

b) sky to land

c) land to sea

d) sea to sky

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12. The graph of pressure (P) against the reciprocal of the volume (I/V) in Boyles's law is a___?

a) parabola

b) hyperbola

c) curve

d) straight line

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13. A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when?

a) the solenoid is moved away from the stationary magnet

b) the magnet is moved away from the stationary solenoid

c) the magnet is moved towards the stationary solenoid

d) there is no relative motion

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14. A current of 0.5 A flows through a resistor when connected to a 40 V battery. How much energy is dispatched in 2 minutes?

a) 1200 J

b) 2400 J

c) 9600 J

d) 1500 J

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15. What is the quantity of heat required to convert 20 g of ice at 0 ºC to water at the same temperature? (Specific latent heat of ice = 336 Jg¯¹)

a) 7.06 x 10³J

b) 1.35 x 10³J

c) 5.38 x 10³J

d) 6.72 x 10³J

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16. Which of the following is a scalar quantity?

a) weight

b) displacement

c) potential energy

d) momentum

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17. An object 40 cm high is 30cm from the pinhole camera. If the height of the image formed is 20 cm. What is the distance of the image from the pin height?

a) 15 cm

b) 40 cm

c) 70 cm

d) 50 cm

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18. Why do tyres have treads?

a) look good

b) increase friction

c) increase its longevity

d) increase weight of tyres

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19. The main factor which affects the speed of sound wave is the?

a) intensity of the sound wave

b) amplitude of the sound wave

c) properties of the medium

d) loudness of the sound wave

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20. If an object just begins to slide on a surface inclined at 30º to the horizontal,the coefficient of friction is?

a) √3

b) 1/√2

c) 1/√3

d) √3/2

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21. In order to remove the error of parallax when taking measurements with a metre rule, the eye should be focused___

a) vertically downwards on the markings

b) slantingly towards the left on the markings

c) vertically upwards on the markings

d) slantingly towards the right on the markings

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22. A reservoir is filled with liquid of density 2000kgm¯¹
. Calculate the depth at which the pressure in the liquid will be equal to 9100Nm¯²
(g = 10 ms¯²)

a) 0.262 m

b) 0.455 m

c) 0.664 m

d) 0.819 m

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23. An isotope has an initial activity of 120 Bq. 6 days later its activity is 15 Bq. What is half-life?

a) 1 day

b) 4 days

c) 2 days

d) 3 days

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24. Which of the following liquid is a poor conductor of electricity?

a) Sea water

b) Tap water

c) Drinking water

d) Distilled water

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25. A train of mass 1600kg attains a speed of 25ms¯¹ in 20 seconds. The power developed in the engine is?

a) 25 KW

b) 50 KW

c) 2.5 KW

d) 80 KW

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26. The amount of energy required to change a kilogram of ice block into the water without a change in temperature is?

a) heat capacity of ice

b) specific heat capacity of ice

c) specific latent heat of fusion of ice

d) specific heat of vaporization of ice

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27. An athlete standing waist-deep in a swimming pool appears to have short legs because of the light__?

a) interference

b) diffraction

c) refraction

d) reflection

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28. The eclipse of the moon occurs when?

a) the moon reflects the rays from the sun to the earth

b) the moon comes exactly between the earth and the sun

c) the earth comes exactly between the moon and the sun

d) the sun comes exactly between the earth and the moon

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29. The gravitational pull on the moon is 1/6 that of the earth. If a body weighs 6.0 N on the moon, what will be its weight on the earth?

a) 6.0 N

b) 36.0 N

c) 12.0 N

d) 5.0 N

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30. According to kinetic molecular model in gases,

a) the particles vibrate about fixed positions and are held together by the strong intermolecular bonds between them

b) the particles occur in clusters with molecules slightly further apart

c) the molecules are very far apart and occupy all the spaces made available to them

d) the particles are closely packed together; they occupy minimum space are usually arranged in a regular pattern

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31. The mercury column in the barometer at natural atmospheric pressure has a height of?

a) 7.6 cm at sea level

b) 0.76 cm at see level

c) 760 cm at sea level

d) 76 cm at sea level

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32. A semiconductor is formed by?

a) covalent bonds

b) electrovalent bonds

c) co-ordinate bonds

d) a substance free of bonds

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33. The vapour pressure___?

a) decreases non-linearly ith measuring temperature

b) decreases linearly with increasing temperature

c) increases non-linearly with measuring temperature

d) increases linearly with increasing temperature

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34. The potential energy in an elastic string of force constant k, which has an extension X is?

a) 1/2K

b) 1/2KX²

c) KX²

d) kX

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35. The relationship between the coefficient of linear expansion
α
and volumetric expansion (
γ
) is-----------------

a) γ = α³

b) γ = α-³

c) 3α

d) γ = α

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36. If a bar magnet is divided into two pieces, which of the following statement is correct?

a) the electric field is created

b) two new magnets are created

c) the magnetic field of each separate piece becomes stronger

d) the bar magnet is demagnetized

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37. Which of the following is not a consequence of hydrogen bubbles covering the copper plate of a primary cell?

a) formation of hydrogen bubbles on the electrode

b) polarization

c) increase in the resistance of the cell

d) local action

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38. A tuning fork that has a frequency of 312Hz emits a wave which has a wavelength of 1.10 m. Find the velocity of sound.

a) 110.0 ms¯¹

b) 312.0 ms¯¹

c) 343.2 ms¯¹

d) 686.4 ms¯¹

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39. Which expression gives the magnetic flux?

a) BA cosθ

b) -N dϕ/dt

c) qVB sinθ

d) μϕI/2πr

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40. An electromagnetic relay is a device used for?

a) storing magnetic field

b) reading the magnitude of magnetic flux

c) controlling another circuit carrying larger current

d) turning in sports

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