JAMB Physics 2022

Which of these is a derived unit?

A) Kilogram B) Metre C) Newton D) Second

Correct Answer: C) Newton

A bar magnet is divided into two pieces, which of the following statements is correct?

A) two new magnets are created B) the magnetic field of each separate piece becomes stronger C) the electric field is created D) the bar magnet is demagnetized

Correct Answer: A) two new magnets are created

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

A) 0. 1 𝑐𝑚 ⁻¹ B) 10𝑐𝑚 ⁻¹ C) 1. 0𝑐𝑚 ⁻¹ D) 2𝑐𝑚 ⁻¹

Correct Answer: C) 1. 0𝑐𝑚⁻¹

An object 40 cm high is 30 cm 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) 70 cm C) 40 cm D) 40 cm

Correct Answer: A) 15 cm

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 towards the stationary solenoid B) there is no relative motion C) the magnet is moved away from the stationary solenoid D) the solenoid is moved away from the stationary magnet

Correct Answer: B) there is no relative motion

Tyres are treaded to?

A) increase weight of tyres B) increase friction C) increase its longevity D) look good

Correct Answer: B) increase friction

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

A) 3.20 𝑚𝑠 ⁻² B) 0.25 𝑚𝑠 ⁻² C) 0.80 𝑚𝑠 ⁻² D) 4.00 𝑚𝑠 ⁻²

Correct Answer: C) 0. 80 𝑚𝑠−2

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

A) γ = α ⁻³ B) γ = α C)Y = 3α D) γ = α ³

Correct Answer: C) Y = 3α

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) increase in the resistance of the cell C) local action D) polarisation

Correct Answer: C) local action

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

A) 4.00 V B) 2.20 V C) 0.15 V D) 8.00 V

Correct Answer: B) 2.20 V

Which of the following liquids is a poor conductor of electricity?

A) Distilled water B) Tap water C) Sea water D) Drinking water

Correct Answer: A) Distilled water

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

A) 3 days B) 2 days C) 1 day D) 4 days

Correct Answer: B) 2 days

The secondary pigments consist of?

A) blue, green, and violet B) yellow, green, and magenta C) magenta, yellow, and cyan D) red, green, and blue

Correct Answer: C) magenta, yellow, and cyan

A person standing waist-deep in a swimming pool appears to have short legs because of light?

A) diffraction B) refraction C) reflection D) interference

Correct Answer: B) refraction

A tuning fork having a frequency of 312 Hz emits a wave which has a wavelength of 1.10 m. Calculate the velocity of sound

A) 312. 0 𝑚𝑠 ⁻¹ B) 110. 0 𝑚𝑠 ⁻¹ C) 343. 2 𝑚𝑠 ⁻¹ D) 686. 4 𝑚𝑠 ⁻¹

Correct Answer: C) 343. 2 𝑚𝑠⁻¹

When the plate area of a capacitor increases?

A) the voltage can withstand increase B) the capacitance decreases C) the capacitance is unaffected D) the capacitance increases

Correct Answer: D) the capacitance increases

A magnet relay is a device used for?

A) reading the magnitude of magnetic flux B) controlling another circuit carrying larger current C) turning in sports D) storing magnetic field

Correct Answer: B) controlling another circuit carrying larger current

According to kinetic molecular model in gases,

A) the particles are closely packed together; they occupy minimum space are usually arranged in a regular pattern 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 occur in clusters with molecules slightly further apart

Correct Answer: C) the molecules are very far apart and occupy all the spaces made available to them

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) 2400 J B) 9600 J C) 1500 J D) 1200 J

Correct Answer: A) 2400 J

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

A) X B) Z C) Y D) K

Correct Answer: A) X

The vapour pressure?

A) increases non-linearly with measuring temperature B) increases linearly with increasing temperature C) decreases linearly with increasing temperature D) decreases non-linearly with measuring temperature

Correct Answer: A) increases non-linearly with measuring temperature

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

A) 𝑘𝑥 B) 𝑘𝑥 2 C) 1/2 Kx² D) (1/2)K

Correct Answer: C) 1/2 kx²

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

A) 0.262 m B) 0.664 m C) 0.819 m D) 0.455 m

Correct Answer: D) 0.455 m

Water is not a good thermometric liquid because it?

A) expands unevenly between 0 ºC and 4 ºC B) maintains fixed density C) has low freezing point D) wets glass

Correct Answer: D) wets glass

Which of these is a second-class lever?

A) sugar tongs B) claw hammer C) plier D) wheelbarrow

Correct Answer: D) wheelbarrow

In the formation of sea breeze, wind blows from?

A) sky to land B) sea to sky C) land to sea D) sea to land

Correct Answer: D) sea to land

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

A) coupling device B) cable C) ferrule D) connector housing

Correct Answer: A) coupling device

In order to view the sun, the most suitable instrument to use is?

A) helioscope B) telescope C) stroboscope D) sun metre

Correct Answer: A) helioscope

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

Correct Answer: C) the earth comes exactly between the moon and the sun

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

A) 6.0 N B) 5.0 N C) 12.0 N D) 36.0 N

Correct Answer: D) 36.0 N

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

A) specific latent heat of fusion of ice B) specific heat capacity of ice C) heat capacity of ice D) specific heat of vaporisation of ice

Correct Answer: A) specific latent heat of fusion of ice

Which expression gives magnetic flux?

A) qVB sinθ B) μϕ𝐼 2π𝑟 C) BA cos θ D) − 𝑁 𝑑ϕ 𝑑𝑡

Correct Answer: C) BA cos θ

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

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

Correct Answer: D) straight line

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

A) 7.06 x 10³J B) 5.38 x 10³J C) 6.72 x 10³J D) 1.35 x 10³J

Correct Answer: C) 6.72 x 10³J

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

A) 2.5 KW B) 80 KW C) 25 KW D) 50 KW

Correct Answer: D) 50 KW

The main factor which affects the speed of sound waves is the?

A) properties of the medium B) amplitude of the sound wave C) intensity of the sound wave D) loudness of the sound wave

Correct Answer: A) properties of the medium

A semiconductor is formed by?

A) coordinate bonds B) electrovalent bonds C) a substance free of bonds D) covalent bonds

Correct Answer: D) covalent bonds

One of the following is a scalar quantity?

A) weight B) momentum C) potential energy D) displacement

Correct Answer: C) potential energy

The mercury column in the barometer at notational atmospheric pressure has a height of?

A) 0.76 cm at see level B) 760 cm at sea level C) 7.6 cm at sea level D) 76 cm at sea level

Correct Answer: D) 76 cm at sea level

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

Correct Answer: D) 1/√3