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Physics Past Questions and Answers

Physics Questions

Question 2831:
WAEC 1998
Which of the following explains the concave meniscus of water in a clean glass tube? the
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  • A Adhension between water and glass molecules is greater than the sdhension between water molecules
  • B Cohension between water molecules is greater then the adhension between glass and water molecule
  • C Molecules of water near the glass move faster than the molecules at the centre of the tube
  • D Molecules of water at the water-air boundary are often attracted to the centre of the tube
  • E Weight of the water pulls the centre part of the surface down
View Answer & Explanation
Question 2832:
WAEC 1998
An electron is accelerated from rest through a potential difference of 70kV in a vacuum. Calculate the maximum speed acquired by the electron (electronic charge = -1.6 x 10-19; mass of an electron = 9.1 x 10-31kg)
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  • A 3.00 x 108ms-1
  • B 2.46 x 108ms-1
  • C 1.57 x 108ms-1
  • D 1.32 x 108ms-1
  • E 1.11 x 108ms-1
View Answer & Explanation
Question 2833:
WAEC 1998
When light from a source is sent through a gas. i. certain wavelengths are absorbed. ii. a dark line is left. Which of the following is/are correct?
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  • A I only
  • B Iii only
  • C I and ii only
  • D I and iii only
  • E Ii and iii only
View Answer & Explanation
Question 2834:
WAEC 1998
The diagram above represents a section of a pair of vernier calipers. The reading on the instrument is
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  • A 5.22cm
  • B 5.24cm
  • C 5.26
  • D 5.35
View Answer & Explanation
Question 2835:
WAEC 1998
The process of increasing the energy of an atom via inelastic collision with an electron is known as
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  • A Ionization
  • B Excitation
  • C Field emission
  • D Photoemission
  • E Thermonic emission
View Answer & Explanation

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