CPO 2024 Prelims Physics
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| Exam | CPO (Prelims) |
| Year | 2024 |
| Subject | Physics |
| Questions | 12 |
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Question 1 of 12
1. Question
Which of the following forces can only be applied when in contact with an object?
Correct
➤ Frictional force is a contact force and acts only when objects are physically touching.
★ It opposes motion between two surfaces and is not a non-contact force like gravitational or magnetic forces.Incorrect
➤ Frictional force is a contact force and acts only when objects are physically touching.
★ It opposes motion between two surfaces and is not a non-contact force like gravitational or magnetic forces. -
Question 2 of 12
2. Question
Identify the device used to change the resistance in an electric circuit.
Correct
➤ A rheostat is a variable resistor used to control current in a circuit by changing resistance.
★ Commonly used in dimmers and fan regulators.Incorrect
➤ A rheostat is a variable resistor used to control current in a circuit by changing resistance.
★ Commonly used in dimmers and fan regulators. -
Question 3 of 12
3. Question
Which of the following is used for determining the value of 1 ampere.
Correct
➤ 1 ampere equals the flow of 1 coulomb of charge per second, i.e., A = 1C/s.
★ It’s the SI unit of electric current.Incorrect
➤ 1 ampere equals the flow of 1 coulomb of charge per second, i.e., A = 1C/s.
★ It’s the SI unit of electric current. -
Question 4 of 12
4. Question
Which of the following pairs of physicists and their contributions/discoveries is INCORRECT?
Correct
➤ The wave theory of light was proposed by Huygens, not Galileo.
★ Galileo studied motion and inertia, not light theory.Incorrect
➤ The wave theory of light was proposed by Huygens, not Galileo.
★ Galileo studied motion and inertia, not light theory. -
Question 5 of 12
5. Question
Which of the following is NOT an example of inertia at rest?
Correct
➤ Sudden braking relates to inertia of motion, not rest.
★ Inertia at rest means a stationary object remains still until force is applied.Incorrect
➤ Sudden braking relates to inertia of motion, not rest.
★ Inertia at rest means a stationary object remains still until force is applied. -
Question 6 of 12
6. Question
What kind of energy does a yo-yo have before it is released?
Correct
➤ A yo-yo held at height has potential energy due to its position.
★ When released, it converts to kinetic energy.Incorrect
➤ A yo-yo held at height has potential energy due to its position.
★ When released, it converts to kinetic energy. -
Question 7 of 12
7. Question
Who among the following physicists invented the voltaic pile, the forerunner of the modern battery, in 1800?
Correct
➤ Alessandro Volta invented the voltaic pile, the first true battery, in 1800.
★ The unit of electric potential, “volt”, is named after him.Incorrect
➤ Alessandro Volta invented the voltaic pile, the first true battery, in 1800.
★ The unit of electric potential, “volt”, is named after him. -
Question 8 of 12
8. Question
Which physicist is known to establish the relationship between mechanical work and heat transfer?
Correct
➤ James Prescott Joule discovered the mechanical equivalent of heat, establishing that energy is conserved and can convert between forms.
★ The SI unit of energy, the joule, is named after him.Incorrect
➤ James Prescott Joule discovered the mechanical equivalent of heat, establishing that energy is conserved and can convert between forms.
★ The SI unit of energy, the joule, is named after him. -
Question 9 of 12
9. Question
Which part of the bifocal lens facilitates near vision?
Correct
➤ The lower part of a bifocal lens contains a convex lens for near vision tasks like reading.
★ The upper part usually corrects distance vision using a different lens type.Incorrect
➤ The lower part of a bifocal lens contains a convex lens for near vision tasks like reading.
★ The upper part usually corrects distance vision using a different lens type. -
Question 10 of 12
10. Question
Who discovered a principle that states that the buoyant force on an object is equal to the weight of the fluid displaced by the object?
Correct
➤ Archimedes’ principle explains that a body immersed in a fluid experiences an upward buoyant force equal to the weight of the displaced fluid.
★ This principle is fundamental in fluid mechanics and density calculation.Incorrect
➤ Archimedes’ principle explains that a body immersed in a fluid experiences an upward buoyant force equal to the weight of the displaced fluid.
★ This principle is fundamental in fluid mechanics and density calculation. -
Question 11 of 12
11. Question
Which of the following statement/statements is/are true regarding the light year?
1.Light year is a unit of distance.
2.Light is a unit of time.
3.A light year is the distance that light travels in one Earth year.
4.Light year is the measurement of light intensity.Correct
➤ A light year is the distance light travels in one Earth year, not a measure of time or intensity.
➤ It equals approximately 9.46 trillion kilometers.
★ This unit is used in astronomy to express vast interstellar distances.Incorrect
➤ A light year is the distance light travels in one Earth year, not a measure of time or intensity.
➤ It equals approximately 9.46 trillion kilometers.
★ This unit is used in astronomy to express vast interstellar distances. -
Question 12 of 12
12. Question
_____ is commonly represented by the Greek letter ρ (rho).
Correct
Incorrect