BS Physics Fundamentals 3

Question 1

Ohm's law states that the current through a conductor is:

Accepted Answer

Directly proportional to voltage and inversely proportional to resistance

Answer

Proportional to the square of the voltage

Answer

Inversely proportional to the voltage

Answer

Independent of resistance

Question 2

In a parallel circuit, the total resistance of two resistors is:

Accepted Answer

Less than the smallest individual resistance

Answer

Greater than the largest individual resistance

Answer

Equal to the sum of the individual resistances

Answer

Equal to the average of the individual resistances

Question 3

A positive charge moving horizontally through a vertical magnetic field experiences a magnetic force that is:

Accepted Answer

Perpendicular to both its velocity and the magnetic field

Answer

Parallel to its velocity

Answer

Opposite to its velocity

Answer

Parallel to the magnetic field

Question 4

Faraday's law of electromagnetic induction states that an EMF is induced in a loop when:

Accepted Answer

The magnetic flux through the loop changes

Answer

Current flows through a nearby resistor

Answer

Two charges are separated by a distance

Answer

A conductor is placed in a static electric field

Question 5

According to Coulomb's law, if one of two point charges is tripled while the distance between them remains the same, the electrostatic force:

Accepted Answer

Increases by a factor of 3

Answer

Increases by a factor of 9

Answer

Decreases by a factor of 3

Answer

Remains unchanged

Question 6

According to Einstein's special theory of relativity, as an object's speed approaches the speed of light, its relativistic mass and length (in the direction of motion) respectively:

Accepted Answer

Increase and contract (decrease)

Answer

Decrease and increase

Answer

Both remain unchanged

Answer

Both increase

Question 7

In alpha decay, the particle emitted from the nucleus consists of:

Accepted Answer

A helium-4 nucleus (2 protons and 2 neutrons)

Answer

A high-energy electron

Answer

A gamma-ray photon only

Answer

A neutron and an antineutrino