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RAS — Physics (light, electricity) MCQs

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

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

RAS — Basic Science — Physics (light, electricity)

20 Questions • Instant results & explanations • Hindi & English

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Question 1 of 20

Given below are two statements, one labeled as Assertion (A) and the other as Reason (R). Review them carefully and select the correct option: Assertion (A): Residential wires are made of copper metal rather than high-resistance alloy mixes. Reason (R): Copper possesses a very low specific resistivity, which limits power loss as heat during electricity transmission.

Question 2 of 20

Consider the following statement: 'The energy conversion taking place inside a motor is precisely the opposite of the energy conversion occurring inside a generator.' In the context of the RAS Preliminary Examination, evaluating this type of factual clarity typically involves which type of question format?

Question 3 of 20

To rectify Far-sightedness (Hypermetropia), which category of corrective lens is fundamentally utilized?

Question 4 of 20

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

Question 5 of 20

Assertion (A): X-rays are highly effective for mapping the intricate soft tissue networks within the human brain. Reason (R): X-rays consist of high-frequency electromagnetic waves that are primarily absorbed by dense structures.

Question 6 of 20

In a household electrical wiring system, appliances are invariably connected in a parallel configuration rather than a series configuration. What is the primary physical reason for this arrangement?

Question 7 of 20

Historically, the true nature of light was a subject of fierce scientific debate. How does modern physics fundamentally resolve this debate?

Question 8 of 20

Match List-I (Device) with List-II (Energy Conversion) and select the correct answer using the codes given below: List-I a. Electric Motor b. Electric Generator c. Solar Cell d. Battery List-II 1. Chemical to Electrical 2. Light to Electrical 3. Mechanical to Electrical 4. Electrical to Mechanical

Question 9 of 20

Every material contains unique properties that dictate how it responds to external physical fields. What is the fundamental property of matter that causes it to experience a definite physical force when placed inside an electromagnetic field?

Question 10 of 20

Total Internal Reflection (TIR) is the core operational principle for optical fibers. Which of the following strict conditions must be met for TIR to occur?

Question 11 of 20

A student sitting at the back of a lecture hall is unable to clearly read the writing on the blackboard but can read a textbook placed on their desk perfectly. Which optical lens must be medically prescribed to correct this specific visual defect?

Question 12 of 20

According to standard dimensional analysis in physics, if an examination question specifically asks to calculate the electrical 'Power' consumed by a circuit, which of the following unit options must be immediately eliminated?

Question 13 of 20

Consider the following statements regarding the electrical properties of materials: 1. Silver is considered the best conductor of electricity due to its extremely low resistivity. 2. The conductivity of semiconductors like Silicon and Germanium decreases as temperature increases. 3. Insulators completely block electron flow due to their infinitely high resistivity. Which of the statements given above is/are correct?

Question 14 of 20

Assertion (A): A ray of light travels significantly slower through a diamond compared to its speed through water. Reason (R): The refractive index of diamond is approximately 2.42, which is substantially higher than the refractive index of water at 1.33.

Question 15 of 20

A standard fluorescent tubelight operates fundamentally differently from a traditional bulb. Which statement correctly explains the physics of a tubelight?

Question 16 of 20

Assertion (A): The power of a convex lens is given a positive sign (+D). Reason (R): A convex lens is a converging lens, and according to convention, its focal length is measured as positive.

Question 17 of 20

Match List I (Electrical Quantity) with List II (SI Unit) and select the correct answer using the codes given below: List I A. Electric Charge B. Electric Current C. Voltage D. Resistance List II 1. Ampere 2. Ohm 3. Coulomb 4. Volt

Question 18 of 20

Match the visual defects in List-I with their respective causes in List-II. List-I P. Presbyopia Q. Astigmatism R. Myopia S. Hypermetropia List-II 1. Irregular curvature of the cornea 2. Loss of elasticity of ciliary muscles 3. Shortening of eyeball 4. Elongation of eyeball Select the correct combination:

Question 19 of 20

Which of the following correctly pairs a specific material alloy with its primary magnetic application?

Question 20 of 20

In the study of modern physics, wave-particle duality applies to light. Which of the following best summarizes this duality?

More Basic Science Subtopics

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