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新加坡留学 O水准科学历年试题

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新加坡留学

发布时间:2012年11月27日    浏览次数:     作者:lulu
新加坡O水准科学历年试题如下:
1.Which statements about the image formed by a magnifying glass is correct?
A it is real, erect and magnified
B it is real, inverted and magnified
C it is virtual, erect and magnified
D it is virtual, inverted and magnified

2.A man who weights 60kg picks a bag of 10kg to use the stairs instead of the lift. The height of each flight is 3m. The man climbs to the storey 12 in 15min. what’s the power by the man?
A 25.7W B 22.0W C 24.0W D 28.0W

3.A ball moving with a speed of 15m/s has a kinetic energy of 1125J. What is its mass?
A 20kg B 75kg C 150kg D 10kg

4.Why the solar heating panels are painted dull black?
A to make it a better emitter B to make it a better absorber
C to make it a better conductor D to make it a better reflector

5.In which kinds of material dose the sound travel fastest?
A solid B liquid C gas D all the same

6.Which of following statements is not true about an electromagnetic wave?
A the are deflected by magnets
B they are all transverse waves
C they can travel through a vacuum
D the travel at the speed of 3×108

7.An electric lamp uses energy at the rate of ‘48W 12V’, what is the current when the lamp is working?
A 0.25A B 4.00A C 2.00A D 0.50A

8.A heater is rated ‘250V 1000W’. What is the best fuse should be used in its plug?
A a fuse rated ‘5A’ B a fuse rated ‘3A’
C a fuse rated ‘10A’ D a fuse rated ‘4A’

9.A plug is wrongly wired with green and brown wires connecting together. What would be the effect of using the plug connecting to an old vacuum cleaner which has a metal case?
A the fuse in the plug would blow B the metal case would be live
C the neutral wire would melt D the vacuum cleaner would catch fire

10.When a sodium ion becomes a sodium atom, it
A loses a electron B gains a electron
C loses two electrons D gains two electrons

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