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CET 12th Level — Physics (light, electricity) MCQs

Practice 20 free physics (light, electricity) multiple choice questions for CET 12th Level exam. Instant answers with explanations in Hindi and English.

Master Physics (light, electricity) under Basic Science for CET 12th Level with our curated MCQ set. Every question follows real Rajasthan exam patterns. Switch between Hindi and English anytime.

CET 12th Level — Basic Science — Physics (light, electricity)

20 Questions • Instant results & explanations • Hindi & English

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Question 1 of 20

Electromotive Force (EMF) of a cell or battery is fundamentally defined as the maximum potential difference between its terminals when:

Question 2 of 20

Ohm's Law states that the current flowing through a metallic conductor is directly proportional to the potential difference applied across its terminals (V=IR). Which parameter MUST remain strictly constant for this linear relationship to hold true?

Question 3 of 20

Electrical Resistance (R) is the opposition offered by a material to the free flow of electrons. At the microscopic atomic scale, what is the primary cause of this resistance?

Question 4 of 20

The electrical resistance (R) of a uniform wire depends heavily on its physical dimensions. If the wire's length (L) is precisely doubled while its mass remains constant, how will its resistance change, assuming temperature is controlled?

Question 5 of 20

Electrical Resistivity (ρ) is a fundamental parameter in circuit design. Which of the following statements correctly isolates the nature of resistivity compared to resistance?

Question 6 of 20

Copper is universally preferred and deployed for industrial and residential household electricity wiring frameworks primarily because:

Question 7 of 20

Consider the following optical statements and identify the correct combination using the codes given below: Statement I: Rainbow formation is a collective manifestation of Refraction, Dispersion, and Total Internal Reflection. Statement II: The deep blue appearance of the clear sky is caused by optical diffraction around heavy storm clouds. Statement III: Optical fibers operate via the continuous execution of Total Internal Reflection.

Question 8 of 20

Match List-I (Optical Condition/Instrument) with List-II (Associated Component/Correction Lens) and select the correct answer using the codes given below: List-I: (a) Myopia Correction (b) Periscope Design (c) Astronomical Telescope (d) Hypermetropia Correction List-II: (i) Large Objective Convex Lens and smaller Eyepiece (ii) Concave Lens (iii) Convex Lens (iv) Two Plane Mirrors angled at 45 degrees

Question 9 of 20

Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). Examine them carefully and select the correct option: Assertion (A): Optical polarization serves as conclusive evidence that light waves are transverse in nature. Reason (R): Polarization involves restricting wave vibrations to a single plane, a process physically impossible for longitudinal waves.

Question 10 of 20

Analyze the following electrical statements and determine which combination is correct: (1) Electric current is measured quantitatively by a voltmeter connected in series. (2) Potential difference represents the work done per unit charge, measured in Volts. (3) An ammeter must be integrated in parallel to prevent excessive resistance buildup.

Question 11 of 20

A uniform cylindrical laboratory conductor wire has a default electrical resistance of 10 Ω. If this wire is uniformly drawn out and stretched until its final length becomes exactly three times (3L) its starting baseline length, what will be its final Resistance and its final Resistivity respectively?

Question 12 of 20

Which of the following wave optics phenomena is correctly defined alongside its typical real-world signature manifestation?

Question 13 of 20

Review the following scientific formulations regarding human vision diagnostics and select the correct option: (a) A near-sighted individual can be successfully assisted using customized concave divergence lenses. (b) Hypermetropia involves the unwanted focusing of near optical images in front of the retinal structure. (c) The structural Lens Formula is algebraically stated as 1/f = 1/v - 1/u.

Question 14 of 20

Given that the elementary charge of a single electron is e = 1.6 x 10^-19 C, calculate the approximate number of electrons required to aggregate together to constitute exactly one Coulomb (1 C) of negative electric charge.

Question 15 of 20

A standard compound microscope utilizes two convex lenses known as the objective and the eyepiece. What is the specific functional purpose of the objective lens in this optical assembly?

Question 16 of 20

An astronomical telescope is configured to view highly distant celestial objects like stars and planets. Which design specification is crucial for its objective lens to capture high-quality images?

Question 17 of 20

Periscopes are specialized optical instruments utilized heavily inside submerged submarines to observe surface activities. What structural configuration allows a periscope to achieve this?

Question 18 of 20

When waves interact under specific conditions, they can exhibit interference. Which of the following observations serves as a classic real-world example of light wave interference?

Question 19 of 20

The physical phenomenon known as 'Diffraction' is fundamentally defined as:

Question 20 of 20

Polarization is a distinctive wave property. Which of the following assertions is correctly validated by the successful execution of optical polarization?

More Basic Science Subtopics

Practice other subtopics under Basic Science to strengthen your CET 12th Level preparation.