64
Which of the following concept is not an evidence of the particle nature of matter?
- A. diffusion
- B. brownian motion
- C. diffraction
- D. crystallization
65
The diagram above represent displacement D, versus time, t graph of a progressive wave. Deduce the frequency of the wave
- A. 20 Hz
- B. 10 Hz
- C. 5 Hz
- D. 4 Hz
66
Calculate the change in volume when 90g of ice is completely melted. [density of water = 1g cm-3, density of ice = 0.9cm-3]
- A. 0.00cm3
- B. 9.00cm3
- C. 10.00cm3
- D. 90.00cm3
67
An object weighs 60.0N in air, 48.2N in a certain liquid X, and 44.9N in water, Calculate the relative density of X
- A. 3.300
- B. 1.279
- C. 0.932
- D. 0.782
68
Which of the following statements about the mass and the weight of a body is not correct? its
- A. mass is a scalar quantity
- B. weight is a function of the gravitational pull on it
- C. mass on earth and on the moon is the same
- D. weigh at the equatior and at the poles is the same
69
The molecular structure of a liquid is such that
- A. the molecules have unlimited freedom of movement
- B. molecular movement is restricted to vibration only
- C. intermolecular collisions take place
- D. all molecules moves move with the same speed