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LDC — Physics (light, electricity) MCQs

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

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

LDC — Basic Science — Physics (light, electricity)

20 Questions • Instant results & explanations • Hindi & English

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Question 1 of 20

The refractive index of a medium is utilized as a direct measure of its optical density. In physics, how is this 'optical density' conceptually distinct from ordinary 'mass density'?

Question 2 of 20

Commercial vehicle manufacturers universally reject the use of traditional plane mirrors or concave mirrors for exterior rear-view purposes, opting exclusively for convex mirrors. What precise optical advantage dictates this critical engineering decision?

Question 3 of 20

What is the primary physical cause responsible for the optical phenomenon known as refraction when light shifts between different transparent media?

Question 4 of 20

Assertion (A): Aluminum and Platinum are classified as paramagnetic materials. Reason (R): These materials have a small, positive magnetic susceptibility and are weakly attracted to a magnetic field.

Question 5 of 20

What is the scientific term used to describe the vision defect commonly known as Near-sightedness?

Question 6 of 20

Which alloy is commonly used in electric fuse wire?

Question 7 of 20

A negative linear magnification value mathematically proves the existence of a real and inverted image. Which single optical instrument can generate this specific output?

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

Modern telecommunications and broadband internet rely heavily on optical fibers for long-distance data transmission. Which foundational optical principle forms the operational backbone of these fibers, allowing minimal signal loss?

Question 10 of 20

Which of the following optical characteristics represents the capacity of a lens to converge or diverge light?

Question 11 of 20

Which branch of physics is described as a 'high-yield topic' that involves the study of light, its properties, and optical instruments?

Question 12 of 20

Consider the mathematical expressions used in basic optics. If 'f' represents focal length, 'v' represents image distance, and 'u' represents object distance, which option correctly states the Mirror Formula and the Lens Formula respectively?

Question 13 of 20

Consider the heating element 'Nichrome', extensively used in high-temperature electrical appliances. Which specific combination of metals forms this alloy?

Question 14 of 20

Read the following statements: 1. The lens formula relates object distance, image distance, and focal length. 2. In the lens formula, focal length (f) is calculated using 1/f = 1/v + 1/u. 3. The unit 'Diopter' requires the focal length to be evaluated in meters. Select the incorrect statement(s).

Question 15 of 20

Match List I (Component) with List II (Associated Material) and select the correct answer using the codes given below: List I A. Best conductor wire B. Heater element C. Electric Fuse wire D. Traditional bulb filament List II 1. Tungsten 2. Lead-Tin alloy 3. Nichrome 4. Silver

Question 16 of 20

The Electromotive Force (EMF) of an electrochemical cell is often confused with terminal voltage. Which condition defines the true Electromotive Force of a voltage source?

Question 17 of 20

A specific optical component is designed using a material with a high refractive index. If a beam of white light enters this component and splits into its component colors, which term describes this process, and what device uses it alongside refraction and reflection to form rainbows?

Question 18 of 20

Why does the clear sky appear blue during the daytime?

Question 19 of 20

A natural rainbow formed in the sky after a rain shower is a beautiful display of light behavior. What is the correct sequence of primary optical processes that sunlight undergoes inside a suspended raindrop to create a rainbow?

Question 20 of 20

Consider the following statements: 1. Modern Physics involves the study of macroscopic celestial bodies' gravitational pull. 2. Thermodynamics is the study of electric circuits. Which of the statements given above is/are NOT correct?

More Basic Science Subtopics

Practice other subtopics under Basic Science to strengthen your LDC preparation.