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2022 - JAMB Physics Past Questions & Answers Cbt Practice

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

a) specific heat of vaporization of ice

b) heat capacity of ice

c) specific heat capacity of ice

d) specific latent heat of fusion of ice

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

a) x

b) z

c) k

d) y

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

a) hyperbola

b) straight line

c) curve

d) parabola

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

a) amplitude of the sound wave

b) intensity of the sound wave

c) properties of the medium

d) loudness of the sound wave

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

a) slantingly towards the left on the markings

b) vertically downwards on the markings

c) slantingly towards the right on the markings

d) vertically upwards on the markings

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

a) 760 cm at sea level

b) 0.76 cm at see level

c) 76 cm at sea level

d) 7.6 cm at sea level

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

a) 0.25 ms-²

b) 4.00 ms-²

c) 0.80 ms-²

d) 3.20 ms-²

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8. 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 magnet is moved away from the stationary solenoid

b) the magnet is moved towards the stationary solenoid

c) there is no relative motion

d) the solenoid is moved away from the stationary magnet

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

a) sky to land

b) sea to land

c) sea to sky

d) land to sea

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

a) reflection

b) interference

c) diffraction

d) refraction

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

a) 2 days

b) 4 days

c) 1 day

d) 3 days

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

a) the bar magnet is demagnetized

b) two new magnets are created

c) the electric field is created

d) the magnetic field of each separate piece becomes stronger

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13. The vapour pressure___?

a) increases linearly with increasing temperature

b) decreases non-linearly ith measuring temperature

c) increases non-linearly with measuring temperature

d) decreases linearly with increasing temperature

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14. 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) 0.819 m

b) 0.455 m

c) 0.664 m

d) 0.262 m

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

a) 2.5 KW

b) 50 KW

c) 25 KW

d) 80 KW

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16. The eclipse of the moon occurs when?

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

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

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

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

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17. Which expression gives the magnetic flux?

a) -N dϕ/dt

b) μϕI/2πr

c) qVB sinθ

d) BA cosθ

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18. An electromagnetic relay is a device used for?

a) reading the magnitude of magnetic flux

b) storing magnetic field

c) turning in sports

d) controlling another circuit carrying larger current

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

a) has low freezing point

b) expands unevenly between 0 ºC and 4 ºC

c) wets glass

d) maintains fixed density

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

a) Tap water

b) Sea water

c) Distilled water

d) Drinking water

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21. Why do tyres have treads?

a) increase friction

b) look good

c) increase weight of tyres

d) increase its longevity

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

a) γ = α-³

b) γ = α³

c) 3α

d) γ = α

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

a) plier

b) claw hammer

c) sugar tongs

d) wheelbarrow

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

a) 1/2KX²

b) KX²

c) kX

d) 1/2K

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

a) stroboscope

b) sun meter

c) helioscope

d) telescope

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

a) 1.0cm¯¹

b) 10cm¯¹

c) 2cm¯¹

d) 0.1 cm¯¹

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

a) polarization

b) increase in the resistance of the cell

c) formation of hydrogen bubbles on the electrode

d) local action

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28. Which of the following is a derived unit?

a) Kilogram

b) Newton

c) Second

d) Metre

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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) 36.0 N

b) 5.0 N

c) 6.0 N

d) 12.0 N

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

a) the voltage can withstand increase

b) the capacitance decreases

c) the capacitance is unaffected

d) the capacitance increases

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31. Which of the following is a scalar quantity?

a) displacement

b) weight

c) momentum

d) potential energy

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32. 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) 6.72 x 10³J

b) 7.06 x 10³J

c) 1.35 x 10³J

d) 5.38 x 10³J

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33. 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) 9600 J

b) 2400 J

c) 1500 J

d) 1200 J

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34. According to kinetic molecular model in gases,

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

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

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

a) √3

b) √3/2

c) 1/√2

d) 1/√3

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

a) connector housing

b) cable

c) couplers

d) ferrule

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37. A semiconductor is formed by?

a) covalent bonds

b) co-ordinate bonds

c) a substance free of bonds

d) electrovalent bonds

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38. 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) 70 cm

b) 40 cm

c) 50 cm

d) 15 cm

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39. 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) 2.20 V

c) 8.00 V

d) 0.15 V

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40. 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) 343.2 ms¯¹

b) 110.0 ms¯¹

c) 312.0 ms¯¹

d) 686.4 ms¯¹

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