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Agniveer Air Force Optics — practice questions

Explore 28 free Optics questions in Agniveer Air Force Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Optics questions and exercises with answers

Showing questions 1–28 of 28.

A galvanometer of resistance G can be converted into a voltmeter of range V by connecting in series a high resistance R given by:Read the answer and worked solution →Two 100-W bulbs are connected in series across 220 V. The total power consumed is:Read the answer and worked solution →Cartesian sign convention: positive or negative?Read the answer and worked solution →True or false: the sign conventionRead the answer and worked solution →Complete the condition for total internal reflectionRead the answer and worked solution →Tap every example of total internal reflectionRead the answer and worked solution →Critical angleRead the answer and worked solution →True or false: optical fibresRead the answer and worked solution →Match each formula to what it describesRead the answer and worked solution →Converging or diverging?Read the answer and worked solution →Complete the definition of lens powerRead the answer and worked solution →Lenses in contactRead the answer and worked solution →Order the steps: solve a mirror problemRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Match each instrument to its magnifying powerRead the answer and worked solution →True or false: optical instrumentsRead the answer and worked solution →Which instrument does this belong to?Read the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Tap every statement true of refractionRead the answer and worked solution →Complete the prism relationRead the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Reading the laws backRead the answer and worked solution →Order the reasoning: why an optical fibre worksRead the answer and worked solution →True or false: mirrors and lensesRead the answer and worked solution →Assertion and reason: instrumentsRead the answer and worked solution →Which quantity is being described?Read the answer and worked solution →

Worked practice questions

A galvanometer of resistance G can be converted into a voltmeter of range V by connecting in series a high resistance R given by:

  1. R = G + V
  2. R = V / I_g − G
  3. R = G I_g / V
  4. R = V · G
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Correct answer: B. R = V / I_g − G

1. Galvanometer gives full deflection at current I_g, so V_g = I_g G. 2. To make it read up to V, drop the excess (V − V_g) across an added series R. 3. At full deflection I_g flows through both, so I_g R = V − I_g G ⇒ R = V/I_g − G. 4. R is large because V/I_g ≫ G typically. _Source: syllabus Physics Ch 3 §3.10 Galvanometer → Voltmeter_

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Two 100-W bulbs are connected in series across 220 V. The total power consumed is:

  1. 50 W
  2. 100 W
  3. 200 W
  4. 400 W
Show answer and solution

Correct answer: A. 50 W

1. Each 100-W bulb at 220 V has R = V²/P = 220²/100 = 484 Ω. 2. In series, total R = 2 × 484 = 968 Ω; voltage 220 V gives I = 220/968 ≈ 0.227 A. 3. Total power = V·I = 220 × 0.227 ≈ 50 W. 4. In series, two identical bulbs share half their normal voltage each → ¼ rated power each → 50 W total. _Source: syllabus Physics Ch 3 §3.10 (combinations and power)_

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Cartesian sign convention: positive or negative?

Read exercise and reference answers
Items
  1. Item
    Measured along the incident light
    Category
    Positive
  2. Item
    Height above the principal axis
    Category
    Positive
  3. Item
    Focal length of a convex mirror
    Category
    Positive
  4. Item
    Measured against the incident light
    Category
    Negative
  5. Item
    Height below the principal axis
    Category
    Negative
  6. Item
    Focal length of a concave mirror
    Category
    Negative
Categories
  1. Item
    Positive
  2. Item
    Negative
Distances measured in the SAME direction as the incident light are positive, those opposite are negative, and all are measured from the pole or optic centre. Heights above the axis are positive. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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