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 111:

  

  Given that SQ = 10cm and SP = 6cm, the refractive index of a block of glass shown above is

  Options:
  A) 0.30
  B) 0.60
  C) 1.67
  D) 2.33
  E) 2.36
  Show Answer
  The correct answer is C .
• Question 112:

  Two bodies have masses in the ratio3:1. They experience forces whichimpart to them,acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced

  Options:
  A) 1:4
  B) 2:1
  C) 2:3
  D) 2:5
  Show Answer
  The correct answer is C .
• Question 113: A circuit has a resistance of 200Ω. The resistance of the circuit can be reduced to 120Ω when Options:
  A) A 300Ω resistor is connected to it in parallel
  B) An 80Ω resistor is conneceted to it in series
  C) A 150Ω resistor is connected to it in parallel
  D) A 240Ω resistor is connected to it in series
  Show Answer
  The correct answer is A .
• Question 114: The function of the system of granulated carbon mixed with manganese (IV) oxide in a Letanche cell is to Options:
  A) increase the e.m.f. of the cell to 2.0V
  B) prevent local action in the cell
  C) prevent polarisation in the cell
  D) make the cell black and hence a good radiator
  Show Answer
  The correct answer is C .
• Question 115:

  A semiconductor is formed by?

  Options:
  A) co-ordinate bonds
  B) electrovalent bonds
  C) a substance free of bonds
  D) covalent bonds
  Show Answer
  The correct answer is D .
• Question 116: The main reason for making the cover of a vacuum flask airtight is to prevent heat loss by Options:
  A) convection
  B) conduction
  C) radiation
  D) evaporation
  Show Answer
  The correct answer is A .
• Question 117: To keep a vehicle moving at a constant speed v, requires power P, from the engine. The force provided by the engine is Options:
  A) $\frac{p}{v}$
  B) $\frac{1}{2}$ v
  C) pv
  D) $\frac{p}{v^2}$ v
  Show Answer
  The correct answer is A .
• Question 118: What is the speed of a body vibrating at 50 cyclic per second Options:
  A) 100 πrads${}^{-1}$
  B) 200 πrads${}^{-1}$
  C) 50 πrads${}^{-1}$
  D) 400 πrads${}^{-1}$
  Show Answer
  The correct answer is A .
• Question 119: When heat is applied to one end of a metal rod, the molecules at the other end soon begin to vibrate with greater amplitude than before because heat has been transferred by Options:
  A) radiation
  B) convection
  C) conduction
  D) evaporation
  Show Answer
  The correct answer is C .
• Question 120:

  Which of the following statements is not true?

  Options:
  A) The mechanical advantage of a smooth inclined plane depends on the ratio of the length to the height of the plane.
  B) The efficiency of an inclined plane decreases as the slope increases.
  C) The effort required to push a given load up an inclined plane increases as the slope increases.
  D) As the slope of an inclined plane increases, the velocity ratio decreases.
  Show Answer
  The correct answer is A .