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736
What is the difference between a crystalline and an amorphous solid? A crystalline solid
  • A. has cubic structure while amorphous solid has hexagonal structure
  • B. has regularly-repeating pattern while an amorphous solid has not
  • C. is white while amorphous solid is yellow
  • D. is always hard while amorphous solid is always soft
  • E. melts on heating while an amorphous solid sublimates on heating.
View Answer & Discuss (4) WAEC 1990
737
Which of the following is not an evidence of the particle nature of matter?
  • A. Diffusion
  • B. Brownian motion
  • C. Diffraction
  • D. Crystal structure
  • E. Photoelectricity
View Answer & Discuss WAEC 1990
738
Which of the following is a scalar quantity?
  • A. Momentum
  • B. Acceleration
  • C. Displacement
  • D. Distance
  • E. Force
View Answer & Discuss (5) WAEC 1992
WAEC offline past questions - with all answers and explanations in one app - Download for free
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739
The diagram above represents the trajectory of a projectile with an initial velocity U. Calculate the time taken to reach the maximum height. (Take g as acceleration due to gravity)
  • A. Usinθ/2g
  • B. 2Usinθ/g
  • C. Ucosθ/g
  • D. 2Ucosθ/g
  • E. Usinθ/g
View Answer & Discuss (5) WAEC 1992
740
What change in velocity would be produced on a body of mass 4kg if a constant force of 16 N acts on it for2 s?
  • A. 0.5 ms-1
  • B. 2.0ms-1
  • C. 8.0 ms-1
  • D. 32.0 ms-1
  • E. 128.0 ms-1
View Answer & Discuss (4) WAEC 1992
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