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新加坡留学 O水准物理考试真题

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发布时间:2012年10月18日    浏览次数:     作者:lulu
O水准物理考试真题

1.Velocity is different frorn speed since velocity
A is a sca丨ar quantity.
B is only rηeasured vertica"y.
C can only be1η easured in cm/s。
D has direction as we"as rη agnitude.

2.A truck sets offfrom traffic lights along a straight road and reaches a speed of
25rn/s after5s。Whatis the average acceleration ofthe truck?
A 5m/s2
B 25m/s2
C 75m/s2
D 125m/s2

3.lf an objectis dropped frorn an aeroplane5000rη above the ground,it vvi"fa"vvith
A constant speed。
B constant acceleration。
C increasing acceleration fo"owed by constant speed。
D decreasing acceleration foHOwed by constant speed.

4.If a gas is heated at constant pressure,which ofthe fo"owing quantities ofthe gas increases?
(1) Temperature ofthe gas
(2) Separation between gas molecules
(3) Number of coⅢ sions between gas molecules and the container walls
A (1)only
B (3)only
C (2)and(3)only
D (1),(2)and(3)

5.The Eskirnos buⅡ d igloos(their shelters)frorn snow because snow can reduce heatloss by
(1) conduction.
(2) convection。
(3) radiation.
A (1)° n丨y
日 (2)only
C (2)and(3)only
D (1),(2)and(3)

6.WhiCh ofthe following pairs has/have different specific heat capacities?
(1)1kg of X in so丨id state and1kg of X in liquid state
(2) 1 kg ofliquid Υ and2kg of Ⅱquid Y atthe same temperature
(3) 1kg of solid z at15° C and1kg of so"d Z at25°C
A (1)only
B (2)on丨y
C (1)and(3)only
D (2)and(3)° n丨y

7.Sonaris used to detectthe depth ofthe seabed,An ultrasonic、Ⅳave is ernitted towards the
seabed and the reflected、″ave is received after2s.Given that the ultrasonic、Ⅳave travels at
1540rη /s in sea water,、″hatis the depth ofthe seabed?
A 385Fη
B 770m
C 1540m
D 3080m

8.Which ofthe fo"owing electromagnetic waves has the highestfrequency?
A Radio waves
B Microwaves
C Red Ⅱght
D lndigo Ⅱght

9.A negatively charged conducting sphere is broughtto touch anotheridentical sphere、Ⅳhich
carries positive charges.Which ofthe fo"owing is not a possib丨e result?
A BOth of thern carry positive charges。
B Both ofthern carry negative charges。
C They carry equal amount of charges,
D The first sphere carries positive charges、″hⅡ e the second one carries negative charges.

10.WhiCh ofthe foⅡ owing d°es not change the e丨ectrica丨resistance of a wire?
A shortening the wire
B Heating up the wire
C lncreasing the thickness ofthe、″ire
D V叫nding the、″ire round a、″ooden block

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