Physics (light, electricity) MCQs for Patwari
Practice 20 free Physics (light, electricity) questions under Basic Science — Science & Tech.
Strengthen your Physics (light, electricity) knowledge for Patwari with curated MCQs. Switch between Hindi and English anytime.
Patwari — Basic Science — Physics (light, electricity)
20 Questions • Instant results & explanations • Hindi & English
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Question 1 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 2 of 20
Which property of soft iron makes it suitable for temporary magnets?
Question 3 of 20
Assertion (A): The phenomenon of refraction occurs identically regardless of the transparency or opacity of the secondary medium. Reason (R): Refraction depends strictly on the change in phase velocity of light, not on the medium's ability to transmit light.
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
Why is light capable of traveling across the vast, empty vacuum of interstellar space to reach Earth?
Question 6 of 20
The complete expulsion of magnetic field lines from the interior of a superconducting material as it transitions into the superconducting state is called the:
Question 7 of 20
Consider the following statements regarding magnetic field lines: 1. Outside a magnet, they travel from the North pole to the South pole. 2. Inside a magnet, they travel from the South pole to the North pole. 3. Magnetic field lines can intersect each other at the poles. Which of the statements given above is/are correct?
Question 8 of 20
The total electrical resistance (R) of a cylindrical metal wire depends on its shape. If a technician stretches a uniform copper wire so its length (L) doubles while keeping its mass and volume constant, how will its resistance change?
Question 9 of 20
The scientific study of optics encompasses several core processes related to light. Which of the following is NOT typically a primary focus of this branch?
Question 10 of 20
Review the following electrical statements and identify the correct combination: (1) An ammeter measures potential difference and must always be wired into a circuit branch in parallel. (2) The mathematical expression for the thin lens formula contains a negative sign: 1/f = 1/v - 1/u. (3) Static electricity describes charges flowing rapidly through heavy industrial copper bars.
Question 11 of 20
In the standard mirror formula (1/f = 1/v + 1/u), what do the variables 'v' and 'u' represent respectively?
Question 12 of 20
A patient notices that the mirror held by a dentist forms a much larger image of a tooth. What must be the specific distance condition for this mirror to function in this manner?
Question 13 of 20
Match List-I with List-II and select the correct answer. List-I (Device) A. Electric Motor B. Electric Generator C. Solar Cell D. Battery List-II (Energy Conversion) 1. Mechanical to Electrical 2. Chemical to Electrical 3. Electrical to Mechanical 4. Solar to Electrical
Question 14 of 20
Match List-I (Optical Application) with List-II (Underlying Scientific Principle): List-I P. Optical Fibers Q. Blue color of the sky List-II 1. Scattering of light 2. Total Internal Reflection
Question 15 of 20
Which of the following atmospheric phenomena is fundamentally caused by the 'Scattering of Light' due to interactions with atmospheric gas molecules and micro-particles?
Question 16 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 17 of 20
Which phenomenon occurs inside the human eye when an excessively curved lens causes an image to form ahead of the retina?
Question 18 of 20
The quantization of electric charge is a basic law of physics stating that charge cannot be subdivided indefinitely. Based on this rule, what is the absolute numerical value of the elementary quantum of charge (e)?
Question 19 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 20 of 20