S4 PHYSICS

…………………………… is the spreading of light energy through narrow openings.
.
1. diffraction
2. interference
3. refraction
4. reflection
Mercury forms spherical drops when split on a wooden bench because it
1. has a high density
2. has a high cohesive force
3. has high adhesive force
4. has low surface tension.
The direction of the path taken by light is known as
1. convergent beam
2. divergent beam
3. a beam
4. a ray
A gas was heated in a closed container so that its volume cannot change. Which of
the following will NOT happen?
1. The pressure of the gas will increase
2. The number of molecules will increase
3. The average speed of the molecules will increase
4. The molecules will move in all directions
A lens is used to form a magnified image of an object placed at a distance u from the lens. The image is formed on the same side of the lens as the object. Which of the following is correct?
i) The image is inverted
ii) The lens used is converging
iii) The distance u is less than the focal length.
iv) The lens used is diverging
1. i and ii
2. i and iv
3. i, ii and iii
4. ii and iii
State the radiations which may be emitted by a radioactive substance.
1. Cathode rays, X-rays, and beta
2. Cathode rays, X-rays and alpha
3. Gamma, alpha and beta
4. Alpha, gamma, and X-rays
The brightness of the spot on a C.R.O. screen is controlled by
1. X-plates
2. Cathode
3. Grid
4. Anode
A man picks up a brick from the ground, raises it and then allows it to fall. which form of energy appears twice in the chain of energy transformation?
1. Chemical
2. Kinetic
3. Potential
4. Sound
Tank containing petrol can be easily emptied using,
1. A hydraulic lift
2. Siphon
3. Common pump
4. Lift pump
A stone is thrown vertically upwards. at the highest point, the stone
1. has maximum velocity
2. Is momentarily at rest
3. is starting to move downwards with maximum velocity
4. is starting downwards with no acceleration
If a fixed mass of a gas is kept at constant temperature, its;
1. volume increases with decrease in pressure
2. density remains the same when pressure is varied
3. Density is inversely proportional to the pressure
4. volume remains the same
Which of the following are brittle substances?
1. dry clay, steel, chalk and wood
2. chalk, steel, plastic and glass
3. Dry clay, glass, chalk and concrete.
4. glass, chalk, concrete and steel
Concrete is weak in tension because,
1. It’s not burnt so it becomes weak when it dries.
2. When it dries, numerous small cracks are formed with in it.
3. It can not be molded into shapes suitable to resist tension
4. The composition of concrete is not strong enough to resist tension
Which of the following laboratory equipment can be of help when determining the diameter of a pin?
1. meter rule
2. String.
3. micrometer screw gauge
4. vernier caliper
A pulley system which has a total of five pulleys in both the fixed and moveable blocks is used to raise a load of 800N with an effort of 200N. Its mechanical advantage is
1. 0.25
2. 40
3. 4
4. 25
In a spade, the arrangement of the forces and fulcrum is in the order of
1. Load, fulcrum and effort
2. Fulcrum, effort and load
3. Fulcrum, load and effort
4. Effort, fulcrum and load
When a glass of very cold water is left in a room for some time, moisture forms on the surface of the glass because

A. the cold water diffuses through the glass
B. the temperature difference across the glass will cause evaporation of the water in the glass
C. the water vapour in the surrounding air will be cooled by the cold surface of the glass
D. the glass is an insulator and will not conduct heat from the surrounding to the water

When a glass of very cold water is left in a room for some time, moisture forms on the surface of the glass because
1. the cold water diffuses through the glass
2. the glass is an insulator and will not conduct heat from the surrounding to the water
3. the water vapour in the surrounding air will be cooled by the cold surface of the glass
4. the temperature difference across the glass will cause evaporation of the water in the glass
Brownian motion experiment shows that molecules of gases are
1. in motion in one direction only
2. more closely packed than molecules in liquid
3. in constant random motion
4. stationary
If X is an isotope of Y, then the
1. atomic mass of X is equal to that of Y
2. atomic mass of X is equal to the atomic number of Y
3. atomic number of X is equal to the atomic mass of Y
4. atomic number of X is equal to that of Y
Pressure in liquids is independent of;
1. density of the liquid
2. Cross sectional area and the shape of the vessel containing the liquid.
3. pressure exerted on the surface of the liquid above
4. depth below the surface of the liquid
Capillary depression in a tube of mercury is due to
1. surface tension
2. Adhesion force being greater than cohesion force
3. cohesive force being greater than adhesion force
4. high vapour pressure
The most appropriate instrument to be used to measure the diameter of a thin wire is;
1. Vernier calipers
2. Micrometer screw gauge.
3. Tape measure
4. Ruler
When a positively changed rod is brought near the cap of positively charged gold leaf electroscope.
1. electrons flow from the cap towards the gold leaf.
2. the divergence of the leaf decreases
3. the divergence of the leaf increases
4. The divergence of the leaf doesn’t change
A resistor in an electric circuit is likely to burn out quickly when;
1. the resistor’s power rating is too high
2. the resistor’s power rating is too low
3. the current flowing is too low
4. a fuse in the circuit blows
A person feels cold when ether is dropped on the skin because ether
1. spread on the skin
2. is at a lower temperature than the skin
3. absorbs heat from the skin and evaporates rapidly
4. Insulates the skin from air
When a liquid is heated
1. evaporation takes place through out the liquid.
2. its density decreases
3. boiling occurs at all temperature
4. its molecules move with the same speed.
Water waves travel a distance of 72cm in 6seconds. If the separation of successive crest is 3.0cm, find the frequency of the waves.
1. 4.00 HZ
2. 36.00 HZ
3. 24.00 HZ
4. 0.25HZ
The quantity of heat absorbed by a substance without change in temperature is called;
1. latent heat
2. specific heat capacity
3. heat capacity
4. specific latent heat
A plastic material is placed between the wall and the foundation during construction to;
1. reduce adhesive forces
2. Increase cohesive forces
3. give a firm grip between the wall and the foundation
4. minimize capillary attraction of moisture from the ground
Which of these describes what happens to the eye lens when a person looks at a distant object?
1. It becomes thicker and moves back
2. It becomes thicker without moving
3. It becomes thinner without moving
4. It becomes thicker and moves back

S4 PHYSICS

Quiz