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Physics (light, electricity) MCQs for LDC

Practice 20 free physics (light, electricity) multiple choice questions for LDC exam. Instant answers, explanations in Hindi and English, and topic-wise targeted practice.

Master Physics (light, electricity) under Basic Science for LDC with our curated MCQ set. Every question is sourced from real Rajasthan exam patterns and updated regularly. Switch between Hindi and English anytime. Use this daily to strengthen weak areas before the exam.

LDC — Basic Science — Physics (light, electricity)

20 Questions • Instant results & explanations • Hindi & English

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Question 1 of 20

The magnificent formation of a natural rainbow in the sky involves a complex combination of which sequence of primary optical phenomena inside individual suspended raindrops?

Question 2 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 3 of 20

Consider the following statements regarding a Myopic eye: A. It experiences an elongation of the eyeball. B. It requires a converging lens for correction. C. The focal point of distant objects falls in front of the retina. Which of the above is/are definitively correct?

Question 4 of 20

Given below are two statements, one labeled as Assertion (A) and the other as Reason (R): Assertion (A): When light transitions from the vacuum of space into water, its speed drops below $3.00 imes 10^8 m/s$. Reason (R): Water is a denser material medium compared to a vacuum, which causes the velocity of electromagnetic waves to decrease. In the context of the above two statements, which one of the following is correct?

Question 5 of 20

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

Question 6 of 20

The sky appears prominently blue during a clear day. Which physical phenomenon is primarily responsible for this visual effect?

Question 7 of 20

Fluorescent tubelights are a more energy-efficient alternative to traditional incandescent bulbs. Which statement accurately describes the core mechanism of light production in a fluorescent tubelight?

Question 8 of 20

A temporary magnet created by passing an active electric current through a coiled wire wound around a highly permeable core is scientifically defined as:

Question 9 of 20

Assertion (A): Total Internal Reflection is the foundational principle allowing optical fibers to bend and transmit internet data seamlessly across oceans. Reason (R): For Total Internal Reflection to function, the light beam must attempt to pass from a rarer medium into a denser medium at an angle less than the critical angle.

Question 10 of 20

Which of the following materials represents a semiconductor, characterized by a resistivity that lies between that of conductors and insulators?

Question 11 of 20

The slight bending of light waves as they pass around the sharp edges of an opaque object or through a narrow aperture is known as:

Question 12 of 20

A student attempts to construct a makeshift illumination device by combining the resistive filament of a traditional tungsten bulb with the pressurized gas chamber of a tubelight. Based strictly on the distinct operational physics of these two devices, what crucial mechanism is entirely unique to the tubelight's design?

Question 13 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 14 of 20

Unlike modern LED or fluorescent technology, the illumination generated by a traditional, old-fashioned tungsten bulb is scientifically categorized as an application of which foundational physical phenomenon?

Question 15 of 20

Which of the following describes the fundamental structural characteristic of a concave mirror?

Question 16 of 20

Why does the clear sky appear blue during the daytime?

Question 17 of 20

Match the Corrective Lens (List-I) with the corresponding Power Sign (List-II): List-I I. Convex Lens II. Concave Lens List-II P. Negative (-D) Q. Positive (+D) Select the correct combination:

Question 18 of 20

Consider the following statements regarding the branches of physics: 1. Mechanics deals with heat and energy transfer. 2. Optics studies light and optical instruments. Which of the statements given above is/are correct?

Question 19 of 20

A student claims that the laws of reflection ($angle i = angle r$ and coplanarity) only apply to perfectly flat, smooth mirrors. Is this claim scientifically accurate?

Question 20 of 20

Which optical phenomenon restricts the vibrations of transverse electromagnetic light waves to a single plane and serves as definitive proof that light is a transverse wave?

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