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 41:

  A train of mass 1600 kg attains a speed of 25 ms${}^{-1}$ in 20 seconds. The power developed in the engine is?

  Options:
  A) 2.5 KW
  B) 80 KW
  C) 25 KW
  D) 50 KW
  Show Answer
  The correct answer is D .
• Question 42: A good calorimeter should be of Options:
  A) low specific heat capacity and low heat conductivity
  B) low specific heat capacity and high heat conductivity
  C) high specific heat capacity and low heat conductivity
  D) high specific heat capacity and low heat conductivity
  E) dull surface and low heat conductivity
  Show Answer
  The correct answer is B .
• Question 43:

  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 44: The distance travelled by a particle starting from rest is plotted against the square of the time elapsed from the commencement of motion. The resulting graph is linear, the slope of this graph is a measure of Options:
  A) initial displacement
  B) initial velocity
  C) acceleration
  D) half the acceleration
  E) half the initial velocity
  Show Answer
  The correct answer is C .
• Question 45:

  The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens

  Options:
  A) 6.5 cm
  B) 7.5 cm
  C) 8.5 cm
  D) 4.5 cm
  Show Answer
  The correct answer is B .
• Question 46: A generator manufacturing company was contracted to produce an a.c dynamo but inadvertently produced a d.c dynamo. To correct this error, the Options:
  A) armature coil should be made of silver
  B) commutator should be replaced with slip ring
  C) commutator should be replaced with split rings
  D) armature coil should be made of aluminium
  Show Answer
  The correct answer is B .
• Question 47:

  

  The diagram above shows a plank RS pivoted its center of gravity O and is in equilibrium with the weight P and Q. If a weight 2P is added to P the plank will be in equilibrium again by

  Options:
  A) moving Q nearer to O
  B) moving P nearer to O
  C) addding a weight Q to Q
  D) moving P further away from O
  Show Answer
  The correct answer is B .
• Question 48: Power supply is transmitted at a very high voltage and low current in order to Options:
  A) make pass through the trasformers
  B) increase the power supply
  C) make it travel fast
  D) prevent overheating of the coil
  Show Answer
  The correct answer is D .
• Question 49: An alternating current with a frequency of 100HZ has a period of Options:
  A) 0.03sec
  B) 0.01sec
  C) 0.04sec
  D) 0.15sec
  Show Answer
  The correct answer is B .
• Question 50:

  In a thermonuclear reaction, the total initial mass is 5.02 x 10^-27kg and the total final mass is 0.01 x 10^-27kg. The energy released in the process is

  [c = 3.0 x 10⁸ms^-1]

  Options:
  A) 9.0 x 10^-13J
  B) 9.0 x 10^-12J
  C) 9.0 x 10^-11J
  D) 9.0 x 10^-10J
  Show Answer
  The correct answer is A .