Jamb Physics 2023 Past Questions and Answers

Question 46:

• JAMB 2023

How much net work is required to accelerate a 1200 kg car from 10\(ms^{-1}\) to 15\(ms^{-1}\)

A. 1.95×\(10^5 j\)
B. 1.35×\(10^4 j\)
C. 7.5×\(10^4 j\)
D. 6.0×\(10^4 j\)

Question 47:

• JAMB 2023

A wire of radius 0.2 mm is extended by 0.5% of its length when supported by a load of 1.5 kg. Determine the Young's modulus for the material of the wire.

[Take g = 10 ms\(^{-2}\)]

A. \(2.4×10^{10}(Nm^{-2})\)
B. \(1.5×10^{10}(Nm^{-2})\)
C. \(2.4×10^9(Nm^{-2})\)
D. \(1.3×10^{10}(Nm^{-2})\)

Question 48:

• JAMB 2023

A man swung an object of mass 2 kg in a circular path with a rope 1.2 m long. If the object was swung at 120 rev/min, find the tension in the rope.

A. 400
B. 288
C. 240
D. 379

Question 49:

• JAMB 2023

A 200 kg load is raised using a 110 m long lever as shown in the diagram above. The load is 10m from the pivot P. If the efficiency of the the lever is 80%, find the effort E required to lift the load.

[Take g = 10ms-2]

A. 250
B. 300
C. 450
D. 200

Question 50:

• JAMB 2023

An air bubble of radius 4.5 cm initially at a depth of 12 m below the water surface rises to the surface. If the atmospheric pressure is equal to 10.34 m of water, the radius of the bubble just before it reaches the water surface is

A. 6.43 cm
B. 8.24 cm
C. 4.26 cm
D. 5.82 cm