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- Multiple ChoicePlease save your changes before editing any questions.
28. The diagram shows a distance-time graph for a vehicle.
Which row describes the motion of the vehicle in region P and in region Q of the graph?
- Multiple ChoicePlease save your changes before editing any questions.
29. A metal block is heated until it is completely melted. None of the melted metal evaporates.
The metal now solidifies.
What happens to the mass of the metal during the changes of state?
- Multiple ChoicePlease save your changes before editing any questions.
30. The diagram shows a solid rectangular block made of material of density 2.0 g / cm3.
What is the mass of the block?
2.0 g
6.0 g
14 g
24 g
- Multiple ChoicePlease save your changes before editing any questions.
31. A worker carries bricks up a ladder.
The following quantities are known.
● the height the bricks are lifted up
● the time taken for the worker to lift the bricks
● the volume of the bricks
● the weight of the bricks
Which quantities are needed to calculate the useful power produced by the worker as he carries
the bricks up the ladder?
height, time and volume
height, time and weight
height, volume and weight
time, volume and weight
- Multiple ChoicePlease save your changes before editing any questions.
32. A gas is contained in a cylinder of constant volume.
The gas is cooled and this causes its pressure to change.
What happens to the speed of the molecules of the gas, and what happens to the pressure of the
gas?
- Multiple ChoicePlease save your changes before editing any questions.
33. A boy sits near a campfire. He holds an iron bar with one end in the fire. His hand becomes hot.
In which ways does thermal energy (heat) from the fire reach his hand?
conduction and convection only
conduction and radiation only
convection and radiation only
conduction, convection and radiation
- Multiple ChoicePlease save your changes before editing any questions.
34. The diagram represents a wave.
How many wavelengths are there between X and Y?
- Multiple ChoicePlease save your changes before editing any questions.
35. A plane mirror is used to form an image of an object.
At which labelled point is the image formed?
A
B
C
D
- Multiple ChoicePlease save your changes before editing any questions.
36. Which group of electromagnetic radiations is arranged in order of increasing frequency?
infra-red, visible light, ultraviolet
ultra-violet, visible light, radio waves
X-rays, radio waves, γ-rays
γ-rays, X-rays, infra-red
- Multiple ChoicePlease save your changes before editing any questions.
37. Four loudspeakers each vibrate at the frequencies shown.
Which loudspeaker produces the highest-pitched sound that can be heard by a human?
5.0 × 103 Hz
15 × 103 Hz
25 × 103 Hz
35 × 103 Hz
- Multiple ChoicePlease save your changes before editing any questions.
38. Which row gives the unit for energy and the unit for electromotive force (e.m.f.)?
- Multiple ChoicePlease save your changes before editing any questions.
39. Three charged balls P, Q and R are suspended by insulating threads. Ball P is negatively
charged.
What are the signs of the charges on ball Q and ball R?
- Multiple ChoicePlease save your changes before editing any questions.
40. The diagrams represent pairs of nuclei of some atoms.
Which pair shows nuclei of different isotopes of the same element?
A
B
C
D