Physics Quiz
Questions: 16 · 10 minutes
1. A 4-ohm resistor is connected across a 12-volt supply. According to Ohm's law, what current flows through the resistor?
0.33 A
4 A
3 A
48 A
2. With the current held constant, which change would generally make a simple coil electromagnet stronger?
Removing the coil while keeping only the power source
Replacing the insulated wire with a nonconducting cord
Increasing the number of turns in the coil
Reducing the coil to a single straight section of wire
3. Two bulbs are connected in series with a battery. If one bulb is removed without closing the gap, what happens to the other bulb?
It becomes brighter because it receives all the current.
It stays at the same brightness because the battery is unchanged.
It goes out because the circuit is open.
It flashes briefly and then remains dim.
4. A machine transfers 600 joules of energy in 3 seconds. What is its average power output?
3 W
200 W
180 W
1,800 W
5. A hammer and a feather are released at the same moment in a vacuum near Earth's surface. What happens?
They fall with the same acceleration and land together.
The hammer lands first because gravity pulls harder on greater mass.
The feather lands first because it has less inertia.
Neither falls because objects need air to move downward.
6. A runner covers 150 metres in 10 seconds at a constant speed. What is the runner's speed?
10 m/s
15 m/s
150 m/s
1,500 m/s
7. A wave completes 5 full cycles in 2 seconds. What is its frequency?
0.4 Hz
5 Hz
2.5 Hz
10 Hz
8. What is the SI unit of force?
Newton
Joule
Pascal
Watt
9. A metal spoon and a wooden spoon have been in the same room for hours. Why does the metal spoon usually feel colder to the touch?
Metal transfers thermal energy away from the hand more quickly.
The metal must be at a lower temperature than the wood.
Wood produces a small amount of heat when touched.
Metal has less internal energy because it is denser.
10. A bus stops suddenly, and an unrestrained passenger continues moving forward. Which principle best explains this?
Every force produces an equal force in the same direction.
An object in motion tends to remain in motion unless acted on by a net external force.
The passenger's mass temporarily increases as the bus slows.
Moving objects naturally accelerate when their support stops.
11. Why do wide snowshoes help a person avoid sinking deeply into soft snow?
They reduce the person's weight by supporting it from below.
They spread the force over a larger area, reducing pressure on the snow.
They decrease the contact area, concentrating the force near the edges.
They increase the upward gravitational force from the snow.
12. A solid sample has a mass of 200 grams and a volume of 50 cubic centimetres. What is its density?
4 g/cm³
2 g/cm³
0.25 g/cm³
250 g/cm³
13. A moving truck collides with a much smaller car. During the collision, how does the force exerted by the truck on the car compare with the force exerted by the car on the truck?
The forces are equal only if both vehicles were moving at the same speed.
The truck exerts a larger force because it has more mass.
The car exerts a larger force because it experiences more damage.
The forces have equal magnitudes and opposite directions.
14. Why would an alarm clock make no audible sound if it were operating inside a perfect vacuum?
A vacuum absorbs all of the clock's mechanical energy.
The clock cannot vibrate unless gravity is present.
Sound changes entirely into light in a vacuum.
Sound needs a material medium through which to travel.
15. Ignoring friction, at which point does a roller-coaster car released from rest at the top of a hill have the greatest kinetic energy?
At the release point, before it begins moving
Halfway down, where kinetic and potential energy must be equal
At every point, because total mechanical energy is constant
At the lowest point of the track
16. A ray of light travels parallel to the principal axis and enters an ideal converging lens. Where does the ray travel after leaving the lens?
Parallel to the principal axis on the other side
Back toward the source along the same path
Through the optical centre without changing direction
Through the focal point on the far side of the lens