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 281: A pipe of length 45cm is closed at the end. Calculate the fundamental frequency of the sound wave generated in the pipe if the velocity of sound in air is 360ms^-1 [Neglect end correction] Options:
  A) 5.5Hz
  B) 148.5Hz
  C) 200.0Hz
  D) 550.0Hz
  Show Answer
  The correct answer is C .
• Question 282: In a purely inductive circuit, the current Options:
  A) lags behind the voltage in phase by 90^o
  B) leads the voltage in phase by 90^o
  C) is in the same phase with the voltage
  D) leads the voltage by 180^o
  Show Answer
  The correct answer is A .
• Question 283: The factional force between two bodies Options:
  A) exists only when there is relative motion or tendency for motion
  B) acts so as to oppose the motion
  C) depends on the normal reaction between the two surfaces
  D) is relatively independent of the area in contact
  E) has all of these characteristics
  Show Answer
  The correct answer is E .
• Question 284: The velocity ratio of a machine is 5 and its efficiency is 75%. What effort would be needed to lift a load of 150N with the machine? Options:
  A) 20N
  B) 30N
  C) 40N
  D) 50N
  Show Answer
  The correct answer is C .
• Question 285: Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain Options:
  A) pressure is increased
  B) pressure is reduced
  C) the rays of the sun add more heat to the water
  D) the saturation vapour pressure of water is higher than at sea-level
  E) the temperature is lower than at sea-level
  Show Answer
  The correct answer is B .
• Question 286: A constant force acts on a body of mass 50kg and changes its speed from 20ms^-1 to 90ms^-1 in 10 seconds. Calculate the magnitude of the force applied. Options:
  A) 590N
  B) 500N
  C) 450N
  D) 350N
  E) 180N
  Show Answer
  The correct answer is D .
• Question 287: An immersion heater rated 2.0A, 240V is used to boil water from temperature 52°c to 100°c. If the mass of the water is 2.5kg. determine the time taken to boil the water.
  [specific heat capacity of water = 4.2 x 10³ jkg^-1 k^-1] Options:
  A) 1.05 x 10³s
  B) 1.05 x 10⁵s
  C) 1.05 x 10²s
  D) 1.05 x 10⁴s
  Show Answer
  The correct answer is A .
• Question 288: A rocket burns 0.01kg of fuel each second and ejects it as a gas with a velocity of 5,000m/s. What force does the gas exert on the rocket? Options:
  A) 500,000N
  B) 500N
  C) 50N
  D) 5,000N
  E) 50,000N
  Show Answer
  The correct answer is C .
• Question 289: In a hydraulic press , a force of 40N is applied on the effort piston of area 0.4m². If the force exerted on the load piston is 400N, the area of the large piston is Options:
  A) 4m²
  B) 8m²
  C) 2m²
  D) 1m²
  Show Answer
  The correct answer is A .
• Question 290:

  

  E, F and G are yellow, red and cyan transparent light filters respectively. The color of a white opaque object when viewed through the arrangement of the filters above is

  Options:
  A) yellow
  B) red
  C) black
  D) blue
  Show Answer
  The correct answer is C .