Grade 11 Physics Midterm Review

Front

Which source of electricity has the lowest environmental impact? Options: Coal, Nuclear, Wind, Natural Gas

Back

Wind

Answer explanation

Wind energy has the lowest environmental impact as it produces no emissions during operation, unlike coal and natural gas, which release greenhouse gases, and nuclear, which has concerns about radioactive waste.

Front

What is the primary disadvantage of using solar energy?

Back

High initial cost

Answer explanation

The primary disadvantage of using solar energy is the high initial cost of installation and equipment, which can be a barrier for many individuals and businesses despite its long-term savings and environmental benefits.

Front

Kirchhoff's Voltage Law states that:

Back

The total current entering a junction equals the total current leaving the junction.

Answer explanation

Kirchhoff's Voltage Law states that the total voltage around a closed loop equals zero. However, the correct choice here is actually Kirchhoff's Current Law, which states that the total current entering a junction equals the total current leaving it.

Front

In a series circuit, the total resistance is:

Back

The sum of all resistances

Answer explanation

In a series circuit, the total resistance is calculated by adding the resistance values of all components. Therefore, the correct answer is 'The sum of all resistances', as it accurately describes how total resistance is determined.

Front

What describes a parallel circuit?

Back

Multiple paths for current to flow

Answer explanation

A parallel circuit has multiple paths for current to flow, allowing different components to operate independently. This distinguishes it from a series circuit, which has only one path.

Front

What happens to the total resistance in a parallel circuit if one more resistor is added?

Back

It decreases

Answer explanation

In a parallel circuit, adding another resistor provides an additional path for current to flow. This reduces the total resistance, as the overall resistance is calculated using the reciprocal formula. Thus, the total resistance decreases.

Front

According to Ampere's Law, the magnetic field around a current-carrying wire is:

Back

Directly proportional to the current and inversely proportional to the distance from the wire.

Answer explanation

According to Ampere's Law, the magnetic field (B) around a current-carrying wire is directly proportional to the current (I) and inversely proportional to the distance (r) from the wire, expressed as B ∝ I/r.

Front

Which of the following statements is true about Oersted's Principle?

Back

A current-carrying wire generates a magnetic field.

Answer explanation

Oersted's Principle states that a current-carrying wire generates a magnetic field around it. This is the correct choice, as the other statements incorrectly describe the relationships between electric and magnetic fields.

Front

If a wire is placed in a magnetic field, the direction of the force on the wire can be determined using:

Back

Right-hand rule

Answer explanation

The direction of the force on a wire in a magnetic field is determined using the Right-hand rule. This rule helps visualize the relationship between the current, magnetic field, and the resulting force.

Front

The accuracy of an experiment refers to:

Back

The closeness of a measurement to the true value.

Answer explanation

The accuracy of an experiment is defined as the closeness of a measurement to the true value. This means that a measurement is considered accurate if it is near the actual or accepted value.