Physics Exam Past Questions and Answers | JAMB, WAEC and NECO

Physics is the science that studies the nature and properties of matter and energy. It covers topics like motion, heat, light, sound, electricity, magnetism, and the structure of atoms.

• Question 571: If the refractive index of a medium in air is 2.0, what is the critical angle for this medium? Options:
  A) 30^o
  B) 42^o
  C) 45^o
  D) 50^o
  Show Answer
  The correct answer is A .
• Question 572:

  A 40 kW electric cable is used to transmit electricity through a resistor of resistance 2.0Ω at 800 V. The power loss as internal energy is?

  Options:
  A) 4.0 x 10²W
  B) 5.0 x 10²W
  C) 4.0 x 10³W
  D) 5.0 x 10³W
  Show Answer
  The correct answer is D .
• Question 573: Which of the following types of motion is/are exhibited by a cylindrical drum rolling down an incline plane? Options:
  A) Random and rotational
  B) Rotational and oscillatory
  C) Rotational only
  D) Translations only
  E) Translational and rotational
  Show Answer
  The correct answer is E .
• Question 574: The temperature gradient across a copper rod of thickness 0.02m, maintained at two temperature junctions of 20°C and 80°C respectively is Options:
  A) 3.0 x 10²Km^-1
  B) 3.0 x 10³Km^-1
  C) 5.0 x 10³Km^-1
  D) 3.0 x 10⁴Km^-1
  Show Answer
  The correct answer is B .
• Question 575: A length of wire has a frequency of 255Hz when stretched by a force of b225N. If the fore increased to 324N, what is the new frequency of vibration Options:
  A) 306 Hz
  B) 512 Hz
  C) 488 Hz
  D) 356 Hz
  Show Answer
  The correct answer is A .
• Question 576:

  Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm

  Options:
  A) 230$\pi$
  B) 23$\pi$
  C) 70$\pi$
  D) 140$\pi$
  Show Answer
  The correct answer is A .
• Question 577: Two lamps are rated 40W and 220V each are connected in series. The total power dissipated in both lamps is Options:
  A) 10W
  B) 20W
  C) 40W
  D) 80W
  E) None of the above
  Show Answer
  The correct answer is D .
• Question 578: A piano wire 0.5m long has a total mass of 0.01kg and is stretched with a tension of 800N. Calculate the frequency of the wire when it sounds its fundamental note Options:
  A) 200Hz
  B) 100Hz
  C) 4Hz
  D) 2Hz
  Show Answer
  The correct answer is A .
• Question 579:

  Arrange the following in the order of their increasing frequency.I. Visible light

  II. Gamma rays

  III. Radio waves

  IV. Infra-red radiation

  V. Ultra-violet radiation

  Options:
  A) I, II, III, IV, V
  B) II, III, IV, V, I
  C) III, IV, V, I, II
  D) IV, III, I. V, II
  E) III, IV, I,V, II
  Show Answer
  The correct answer is E .
• Question 580: The use of electrical fuses in domestic wiring is Options:
  A) to prevent and electrical shock
  B) to supply electricity to all the electrical appliances
  C) to allow electricity to flow easily through the mains to all the circuits
  D) to cut off the mains supply it too high a current flows
  E) to fuse all the circuit into one
  Show Answer
  The correct answer is D .