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Physics 2019 WAEC Past Questions

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21

The vacuum in a thermoflask reduces heat loss resulting from

  • A. radiation only
  • B. conduction and convection only
  • C. radiation and convection only
  • D. conduction only
View Answer & Discuss (1) WAEC 2019
22

The diagram above represents an experimental set-up for verifying?

 

  • A. lens formula
  • B. refraction laws
  • C. reflection laws
  • D. mirror formula
View Answer & Discuss (16) WAEC 2019
23

Which of the following statements about a moving object is correct?

  • A. When accelerating, the resultant force acting on it must be equal to zero.
  • B. There must always be a non-zero resultant force acting on it.
  • C. At a steady velocity, the resultant force acting on it must be equal to zero
  • D. At a steady velocity, the air resistance must be equal to zero.
View Answer & Discuss (4) WAEC 2019
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24

If the efficiency of a transformer is 100%, which of the following equations would be correct? 
 

  • A. N\(_p\)E\(_p\) = N\(_s\)E\(_s\)
  • B. N\(_s\)I\(_p\)= N\(_p\)I\(_s\)
  • C. N\(_s\)I\(_s\) = N\(_p\)I\(_p\)
  • D. I\(_p\)E\(_s\) = I\(_s\)E\(_p\)
View Answer & Discuss (4) WAEC 2019
25

A freshly demagnetized bar magnet is placed in the East-West direction to ensure that

  • A. the molecular magnets remain randomly arranged. 
  • B. the molecular magnets are properly aligned
  • C. it is affected by the earth's magnetic field
  • D. the magnetic domains are within the earth's field
View Answer & Discuss (6) WAEC 2019
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