FREE OAT Physics Principles Questions and Answers

Question 1

A block of mass 'm' is placed on a frictionless inclined plane that makes an angle 'θ' with the horizontal.
Which of the following expressions represents the magnitude of the normal force exerted on the block by the plane?

Accepted Answer

mg cos(θ)

Answer

mg sin(θ)

Answer

mg tan(θ)

Answer

mg

Question 2

A sound wave travels through air at a speed of 343 m/s. If the frequency of the sound wave is 686 Hz, what is its wavelength?

Accepted Answer

1.0 m

Answer

0.5 m

Answer

2.0 m

Answer

4.0 m

Question 3

Which of the following describes the principle of conservation of mechanical energy for a system where only conservative forces (like gravity and elastic spring force) are doing work?

Accepted Answer

The total mechanical energy (kinetic + potential) remains constant.

Answer

Kinetic energy is always converted into potential energy.

Answer

Potential energy is always converted into kinetic energy.

Answer

The total mechanical energy increases over time.

Question 4

A series circuit consists of a 12 V battery and three resistors with resistances of 2 Ω, 3 Ω, and 7 Ω. What is the total current flowing through the circuit?

Accepted Answer

1.0 A

Answer

2.0 A

Answer

0.5 A

Answer

12.0 A

Question 5

A convex lens has a focal length of 10 cm. An object is placed 30 cm in front of the lens. Where will the image be formed?

Accepted Answer

15 cm on the opposite side of the lens

Answer

7.5 cm on the same side as the object

Answer

30 cm on the opposite side of the lens

Answer

10 cm on the same side as the object

Question 6

Which of the following statements correctly describes the relationship between pressure and volume of an ideal gas at constant temperature and number of moles?

Accepted Answer

Pressure is inversely proportional to volume.

Answer

Pressure is directly proportional to volume.

Answer

Pressure is independent of volume.

Answer

Pressure is directly proportional to the square of the volume.

A block of mass 'm' is placed on a frictionless inclined plane that makes an angle 'θ' with the horizontal.Which of the following expressions represents the magnitude of the normal force exerted on the block by the plane?

A block of mass 'm' is placed on a frictionless inclined plane that makes an angle 'θ' with the horizontal.
Which of the following expressions represents the magnitude of the normal force exerted on the block by the plane?