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Physics O Level
Which of the following is a suitable device for measuring the internal diameter of a capillary tube with diameter less than 0.5 mm.
Micrometer Screw Gauge
Which of the following comprises one vector and one scalar quantity?
Magnetic Field, Velocity
In the absence of air resistance, what happens to the acceleration of a ball being thrown into the air, as it rises to greater heights?
If the displacement time graph of a particle's movement is a straight line with gradient m (where m > 0), what can we conclude about its acceleration time graph?
Straight line with positive gradient
Straight line with negative gradient
A body on a horizontal frictionless surface is acted upon by a 5 N force towards the right, and another 5 N force towards the left. Which of the following CANNOT describe the body's motion?
It is stationary
It is moving to the left
It is moving to the right
It is slowing down
A 3 N force is to be added to a 8 N force. Which of the following CANNOT be the magnitude of the resultant force?
A box slides down a rough incline plane. Which of the following describes how energy is being conserved?
Loss in K.E. = Gain in P.E. + Work Done against Friction
Gain in K.E. = Loss in P.E. + Work Done against Friction
Loss in P.E. = Gain in K.E. + Work Done against Friction
Gain in P.E. = Loss in K.E. + Work Done against Friction
A rod is balanced horizontally with several weights placed on it. How does its moment at the right end of the rod compare with its moment about its centre of gravity?
Moment at right end is greater than at C.G.
Moment at right end is less than at C.G.
Moment at right end is same as at C.G.
Cannot be determined without further information
The acceleration of free fall on the Moon is 1/6 that on the Earth. Two pieces of rock, A and B, have the same volume. A is placed on the Moon and B on Earth. If both of them have the same weight, what is the ratio of A's density to B's density?
1 : 1
1 : 6
6 : 1
Cannot be determined
Which of the following will cause the height of the mercury column in a barometer to rise?
Bring it up the mountain
Introduce some air into the barometer, in the space above the mercury column
Bring it to the moon and place it out in the open
Placing it inside a manned space station in outer space
Which of the following DOES NOT result in faster speed of response of a thermometer?
Using a bulb with a thinner glass
Using a bore with a larger diameter
Using mercury instead of alcohol
Using a smaller bulb
Which of the following temperature is not possible?
868 Degree Celsius
27 Degree Celsius
-189 Degree Celsius
-386 Degree Celsius
When substance A and B are both heated with the same heater, the temperature of A rises faster than that of B. What can we conclude about A and B?
A has a higher specific heat capacity than B
A has a lower specific heat capacity than B
A has a higher heat capacity than B
A has a lower heat capacity than B
The specific latent heat of vapourization of water is about 6.7 times that of the specific latent heat of fusion of water. What is the ratio of the latent heat of vapourization of 6.7 kg of water compared to the latent heat of fusion of 1 kg of water?
1 : 6.7
6.7 : 1
1 : 45
45 : 1
The pressure of air in a container has increased. What could have been the cause of the increase?
An increase in the volume of the container
A decrease in the temperature of the gas
An increase in the molecules' average kinetic energy
A decrease in the molecules' average speed
When water waves move from a deeper to a shallower region ...
Its wavelength decreases
Its wavelength increases
Its frequency decreases
Its frequency increases
A man of height 1.8 m tries to see his whole body with a mirror, from the top of his head to the tip of his toes. What is the minimum length of mirror required?
A beam of light hits a mirror at an angle. When the mirror is rotated by 10 degrees, by what angle does the reflected beam turn?
When light in glass strikes the glass-air interface at an angle of incidence less than the critical angle, which of the following statement is true?
It is totally reflected back into the glass
It totally exits the glass
It is partially reflected back into the glass
It is reflected back along its original path
A fish in a pond looks up at a man standing beside the pond. To the fish, the man appears ...
Smaller and nearer than he actually is
Smaller and further than he actually is
Larger and nearer than he actually is
Larger and further than he actually is
The distance between a compression and rarefaction in a sound wave is 0.15 m. The period of the sound wave is 0.20 milliseconds. The speed of the sound is:
At the centre of a rarefaction of a sound wave in air, the pressure is 91,000 Pa. Which is the most likely pressure at the centre of a compression of the same wave?
A metal sphere is given a positive charge. Where do all the charges reside?
At the centre of the sphere
Evenly spread out within the sphere
At the surface of the sphere
Outside the sphere
What happens when a positively charged rod is brought near a piece of paper?
The free electrons in the paper move towards the side nearer the rod
The rod causes a distortion of the charge distribution in the paper's atoms
The rod causes the paper atoms to become ionized
The rod causes a break down of air molecules between the rod and the paper
Three resistors of finite value R (where R > 0) are connected in series in a circuit. Which of the following combinations of their voltages is NOT possible?
3V, 2V, 5V
0V, 3V, 5V
0V, 0V, 0V
2V, 2V, 2V
A voltmeter with finite resistance is used to measure the potential difference across a resistor in a circuit. The measured reading of the voltmeter is:
Greater than the actual potential difference
Equal to the actual potential difference
Smaller than the actual potential difference
Not possible to tell without further information
Which of the following devices' main purpose is NOT to provide safety to users of electricity
Earth Leakage Circuit Breaker
Miniature Circuit Breaker
How can power loss be reduced in power transmission?
Increase the transmitted voltage
Decrease the load resistance
Increase the transmission wire's resistance
Decrease the frequency of the transmitted current
Which of the following is NOT suitable for use as a transformer core?
Which of the following actions CANNOT increase the magnetic field strength of an electromagnet with only air within its core?
Increasing the current through the coils
Increasing the number of turns per unit length
Inserting a piece of soft iron into the coils
Increasing the diameter of the coils
A vertical wire carries a current from the floor to the ceiling. To which side of the wire is it possible for the resultant magnetic fied to be zero?
To its North
To its South
To its East
To its West
A loop of wire rotates in a magnetic field. Which of the following actions causes an increase in the e.m.f. generated by the coil?
Rotating at a slower speed
Increasing the number of turns
Reducing the area of the coil
Using a weaker magnet
Which of the following is the most important word in Lenz's Law?
When both inputs of a NAND gate are joined together into a single input, what gate does it become?
A radioactive source emitting only alpha-particles is placed on a table, with a Geiger-Muller tube pointing at it. The G-M tube records 500 counts per minute. When a 2-cm thick lead plate is placed between the radioactive source and a Geiger-Muller tube, what count rate is to be expected?
500 per minute
100 per minute
20 per minute
0 per minute
Which of the following affects the activity level of a radioactive source?
Increasing the pressure of the surrounding
Increasing the temperature of the surrounding
Immersing the source in concentrated acid
None of the above
A radioactive source has a half-life of 24 hours. At 1:00 am, it has an activity 1000 counts per minute. At 1:00 pm on the same day, what is its most likely activity?
900 counts per minute
800 counts per minute
700 counts per minute
600 counts per minute
Which of the following is not a conclusion of Geiger and Marsden's Alpha Scattering Experiment?
The nucleus is small
The nucleus is massive
The nucleus is stable
The nucleus is positive
Which of the following is a reactant in nuclear fission and a product in nuclear fusion?
Einstein's equation E = mc-squared illustrates the:
Law of Conservation of Mass
Law of Conservation of Energy
Law of Conservation of Mass-Energy
Law of Conservation of Momentum
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