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 1241:

  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 1242:

  The Earth's magnetic equator passes through Jos in Nigeria. At Jos, the

  Options:
  A) angle of variation is zero
  B) magnetic declination is 90
  C) angle of dip is zero
  D) horizontal component at the Earth's field is zero
  Show Answer
  The correct answer is C .
• Question 1243: A ship travelling towards a cliff receives the echo of its whistle after 3.5 seconds. A short while later, it receives the echo after 2.5 seconds. If the speed of sound in air under the prevalling condition is 250ms ^-1, how much closer is the ship to the cliff? Options:
  A) 10m
  B) 125m
  C) 175m
  D) 350m
  E) 1,000m
  Show Answer
  The correct answer is B .
• Question 1244: A parachute attains a terminal velocity when Options:
  A) its density is equal to the density of air
  B) the viscous force of the air and the upthrust completely counteract its weight
  C) it expands as a result of reduced external pressure
  D) the viscous force of the air is equal to the sum of the weight and upthrust
  Show Answer
  The correct answer is B .
• Question 1245: Efficiency of a transformer is equal to Options:
  A) Efficiency of transformer = (secondary coil ÷ primary coil) × 100%
  B) Efficiency of transformer = (mechanical advantage ÷ velocity ratio) × 100%
  C) Efficiency of a transformer = (Number of turns in the secondary coil ÷ Number of turns in the primary coil) × 100%
  D) Efficiency of a transformer = (power developed in the secondary coil ÷ power supplied to the primary coil) × 100%
  Show Answer
  The correct answer is D .
• Question 1246: A constant force of 40N acting on a body initially at rest gives an acceleration of 0.1ms^-2 for 4s. Calculate the work done by the force Options:
  A) 8J
  B) 10J
  C) 32J
  D) 160J
  Show Answer
  The correct answer is C .
• Question 1247:

  A cell whose internal resistance is 0.55$\mathrm{\Omega }$ delivers a current of 4 A to an external resistor. The lost voltage of the cell is?

  Options:
  A) 4.00 V
  B) 2.20 V
  C) 0.15 V
  D) 8.00 V
  Show Answer
  The correct answer is B .
• Question 1248:

  The half life of a radioactive material is 12 days. Calculate the decay constant.

  Options:
  A) 0.8663 $da{y}^{-1}$
  B) 0.04331 $da{y}^{-1}$
  C) 0.17325 $da{y}^{-1}$
  D) 0.05775 $da{y}^{-1}$
  Show Answer
  The correct answer is D .
• Question 1249:

  

  Three 2-µF capacitors are arranged as seen in the circuit above . The effective capacitance between E and F is

  Options:
  A) 0.75µF
  B) 1.33µF
  C) 3.00µF
  D) 6.00µF
  Show Answer
  The correct answer is B .
• Question 1250: A gun of mass 2.0kg fires a bullet of mass 16 x 10 ^-2kg due East. If the bullet leaves the nozzle of the gun with a velocity of 150ms^-1, what is the recoil velocity of the gun? Options:
  A) 150ms^-1 due West
  B) 1.2 x 10^-4ms^-1 due West
  C) 1.2ms^-1 due West
  D) 1.2ms^-1 due East
  E) 150ms^-1 due East
  Show Answer
  The correct answer is C .