Physics Mcqs

1.What type of waves are utilized in line-of-sight (LOS) communication systems?

2.A wire with a uniform cross-sectional area A, length L, and resistance R is divided into two segments. What happens to the resistivity of each segment?

3.When the voltage across a wire is increased to twice its original value, how does the drift velocity of the free electrons change?

increase by a factor of fourincrease by a factor of twodecrease to half its original valuestay the same

4.Which device is utilized to visualize the trajectory of visible rays?

Geiger meterWilson cloud chamberSemiconductor detectorNo listed option

5.What is the term for the movement when a body rotates about an axis that runs through itself?

Spin motionOrbital motionStraight-line motionTranslational motion

6.What is the formula that relates linear velocity to angular velocity?

v = r × ωr = v × ωs = rΔs / Δt

7.What is the approximate velocity of Earth's orbit around the Sun?

8.What is the name of the electron's corresponding antiparticle?

ProtonMesonNeutronPositron

9.What color does a black body radiating across the entire visible spectrum appear to the human eye?

10.Which of the following best describes the state of a photon?

Traveling at the speed of lightStationary or at restUndergoing accelerationMoving at the speed of sound

11.Who is credited with the discovery of the Compton effect?

12.How does time behave as a result of the relative movement between an observer and a reference frame?

ExpandsShrinksRemains unchangedStays steady

13.At what velocity does an object's mass become twice its rest mass?

2.6 × 10⁴ meters per second2.6 × 10⁶ meters per second2.6 × 10² meters per second2.6 × 10 meters per second

14.Which formula correctly expresses Einstein's mass-energy equivalence principle?

E = mc²E = hfE = m²cE = mv²

15.What is the name of the current satellite navigation system widely used today?

Inertial reference framesNavstarProtonNone of the above

16.What characteristic does a black body exhibit regarding all incoming radiation?

EmitBounce backTake inNeither of these

17.How many gamma-ray photons are produced when an electron and a positron annihilate each other?

18.What is the common effect produced by both alternating current (A.C.) and direct current (D.C.)?

Impact on capacitor chargingInfluence on battery chargingEffect when flowing through an inductorGeneration of heat in a resistor

19.What is the equivalent of 1 Weber per square meter in gauss?

Equal to a single gaussEquivalent to 3 × 10¹⁰ gaussCorresponds to 10,000 gaussSame as one third times 10⁻⁸ gauss