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 991: A hydrometer is an instrument for measuring the Options:
  A) depth of water in a vessel
  B) relative density of a liquid by the method of flotation
  C) relative dendity of a liquid by finding the apparent loss in weight
  D) relative humidity of the air
  E) atmospheric pressure when the air is humid
  Show Answer
  The correct answer is B .
• Question 992: What happens when a, certain quantity of pure ice is completely changed to water at 0^oC? Options:
  A) latent heat is absorbed, the mass remains constant, and the volume decreases
  B) latent heat is given out, the mass remains constant and the volume decreases
  C) latent heat is given out, the mass increases and the volume remains constant
  D) latent heat is absorbed, the mass decreases and the volume increases
  Show Answer
  The correct answer is B .
• Question 993: The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a Options:
  A) concave mirror of focal length 5cm
  B) concave mirror of focal length 10cm
  C) convex mirror of focal length 5cm
  D) convex mirror of focal length 20cm
  Show Answer
  The correct answer is A .
• Question 994: A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill? Options:
  A) 528m
  B) 66m
  C) 136m
  D) 264m
  Show Answer
  The correct answer is C .
• Question 995:

  If a force of 50N stretches a wire from 20m to 20.01m, what is the amount of force required to stretch the same material from 20m to 20.05m?

  Options:
  A) 250N
  B) 200N
  C) 100N
  D) 50N
  Show Answer
  The correct answer is A .
• Question 996:

  If in a simple pendulum experiment the length of the inextensible string is increased by a factor offour, its period is increased by a factor of?

  Options:
  A) 4
  B) $\frac{\pi }{2}$
  C) $\frac{1}{4}$
  D) 2
  Show Answer
  The correct answer is D .
• Question 997: High Tension(H.T.) transmission means Options:
  A) to transmit a given amount of power, the tension in the conducting wire must be high
  B) heat is not lost when current is passed through a conductor
  C) heat is gained when a given power is transmitted
  D) a big transformer is required to transmit power
  E) trasmission of power at low current and high voltage
  Show Answer
  The correct answer is E .
• Question 998:

  

  The diagram shown represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40, then the value of W is?

  Options:
  A) 28.0
  B) 48.0N
  C) 233.0N
  D) 50.0N
  Show Answer
  The correct answer is D .
• Question 999:

  Cathode rays are

  Options:
  A) High-energy electromagnetic waves
  B) protons
  C) neutrons
  D) streams of electrons
  Show Answer
  The correct answer is D .
• Question 1000: If the normal atmospheric pressure in a laboratory supports a column of mercury 0.76m high and the relative density of mercury is 13.8, then the height of water column which atmospheric pressure will support in the same laboratory at the same time is Options:
  A) 0m
  B) 10m
  C) 13m
  D) 14m
  E) 18m
  Show Answer
  The correct answer is B .