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 1681: The vacuum in a thermos flask helps to reduce heat transfer by? Options:
  A) convection and radiation
  B) convection and conduction
  C) conduction and radiation
  D) radiation only
  Show Answer
  The correct answer is B .
• Question 1682:

  A narrow beam of white light can be split up into different colours by a glass prism. The correct explanation is that

  Options:
  A) white light Is an electromagnetic wave
  B) the prism has all the colours of the white light
  C) different colours of white light travel with different speeds in glass
  D) white light has undergone total Internal reflection in the prism
  Show Answer
  The correct answer is C .
• Question 1683: Radio waves have a velocity of 3 x 10⁸ms^-1. A radio station sends out a broadcast on a frequency of 800kHz. The wavelength of the broadcast is Options:
  A) 375.0m
  B) 267.0m
  C) 240.0m
  D) 37.5m
  E) 26.7m
  Show Answer
  The correct answer is A .
• Question 1684:

  

  In the diagram above, if the internal resistance of the cell is zero, the ration of the powers P₁ and P₂ dissipated by R₁ and R₂

  Options:
  A) ^R₂/_R1
  B) ^R₁/_R2
  C) ^R₁+R₂/_R1
  D) ^R₁+R₂/_R2
  Show Answer
  The correct answer is A .
• Question 1685:

  A thermocouple thermometer is connected to a millivoltmeter which can read up to 10mV. When one junction is in ice at 0°C and the other is steam at 100°C, the millivoltmeter reads 4mV. What is the maximum temperature which this arrangement can measure

  Options:
  A) 100${}^o$C
  B) 248${}^o$C
  C) 250${}^o$C
  D) 350${}^o$C
  Show Answer
  The correct answer is C .
• Question 1686:

  One of the features of the fission process is that

  Options:
  A) it leads to chain reaction
  B) its products are not radioactive
  C) neutrons are not released
  D) the of the masses of the reactants equals the sum of the masses of the products
  Show Answer
  The correct answer is A .
• Question 1687:

  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 1688:

  The pin-hole camera produces a less sharply defined image when the

  Options:
  A) pin-hole is larger
  B) illumination is less
  C) screen is further from the pin-hole
  D) object is further from the pin-hole
  Show Answer
  The correct answer is A .
• Question 1689:

  A lead bullet of mass 0.05kg is fired with a velocity of 200ms${}^{-1}$ into a block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is?

  Options:
  A) 50J
  B) 100J
  C) 150J
  D) 200J
  Show Answer
  The correct answer is A .
• Question 1690: If a charged ion goes through combined electric and magnetic fields, the resultant emergent velocity of the ion is Options:
  A) E/B
  B) EB
  C) B/E
  D) E - B
  Show Answer
  The correct answer is A .