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physics important questions for competitive exams., High school final essays of Physics

Physics

this is very helpful for physics students to score best in exam. as it covers all questions for physics for class 10. download to get more like this!!! thankyou.

Typology: High school final essays

2025/2026

Available from 02/02/2026

kartik-24
kartik-24 🇮🇳

3 documents

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� VERY IMPORTANT SHORT ANSWER QUESTIONS (2–3 Marks)
1. Why does the resistance of a conductor increase with
increase in temperature?
2. Write the relation between magnification and image
distance for a lens.
3. What happens to the focal length of a convex lens when it is
immersed in water?
4. Why is tungsten used as a filament in electric bulbs?
5. State the SI unit of electric charge and define it.
6. What is the function of an earth wire in household circuits?
7. Why should appliances of high power rating not be
connected in series?
8. Define electromagnetic induction.
9. What is the significance of right-hand thumb rule?
10. Why are magnetic field lines closed curves?
� IMPORTANT LONG ANSWER QUESTIONS (4–5 Marks)
1. Derive the lens formula for a convex lens.
2. Explain the construction and working of an electric
generator with a diagram.
3. What is electric power? Derive relations:
o P = VI
o P = I²R
o P = V²/R
pf3

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Download physics important questions for competitive exams. and more High school final essays Physics in PDF only on Docsity!

� VERY IMPORTANT SHORT ANSWER QUESTIONS (2–3 Marks)

  1. Why does the resistance of a conductor increase with increase in temperature?
  2. Write the relation between magnification and image distance for a lens.
  3. What happens to the focal length of a convex lens when it is immersed in water?
  4. Why is tungsten used as a filament in electric bulbs?
  5. State the SI unit of electric charge and define it.
  6. What is the function of an earth wire in household circuits?
  7. Why should appliances of high power rating not be connected in series?
  8. Define electromagnetic induction.
  9. What is the significance of right-hand thumb rule?
  10. Why are magnetic field lines closed curves?

� IMPORTANT LONG ANSWER QUESTIONS (4–5 Marks)

  1. Derive the lens formula for a convex lens.
  2. Explain the construction and working of an electric generator with a diagram.
  3. What is electric power? Derive relations: o P = VI o P = I²R o P = V²/R
  1. Explain refraction of light through a rectangular glass slab with ray diagram.
  2. Describe domestic electric circuit with a neat diagram.
  3. Explain renewable and non-renewable sources of energy with advantages and disadvantages.
  4. What are magnetic field lines? Explain their properties.
  5. Explain the working of a fuse and MCB.
  6. Describe the phenomenon of scattering of light. Why is the sky blue?
  7. Explain human eye structure and image formation.

� MOST IMPORTANT NUMERICAL QUESTIONS (HIGH

PROBABILITY)

  1. Three resistors of 2 Ω, 3 Ω and 6 Ω are connected in parallel. Find equivalent resistance.
  2. An electric heater works at 220 V and draws 5 A current. Find: o Power o Energy consumed in 2 hours
  3. Find the image distance and magnification when an object is placed at 30 cm from a convex lens of focal length 15 cm.
  4. A bulb is rated 220 V, 60 W. Find: o Current drawn o Resistance of the filament
  5. Calculate the heat produced in 5 minutes by a current of 3 A through a resistance of 10 Ω.