Heating Effect of Current MCQs for CBSE Exams
Heating Effect of Current – MCQs for CBSE Exams
Class: 12 | Subject: Physics |
Section: Current Electricity |
Topic: Heating Effect of Current
Based on: NCERT Syllabus | CBSE Board Examination Standard
Based on: NCERT Syllabus | CBSE Board Examination Standard
Instructions: These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 12 Board Examination preparation.
1. Heating effect of current is given by:
Answer: B
Joule’s law states H = I²Rt, representing heat produced in a conductor.
Joule’s law states H = I²Rt, representing heat produced in a conductor.
2. SI unit of heat energy:
Answer: A
Heat is a form of energy measured in joules.
Heat is a form of energy measured in joules.
3. Heat produced ∝
Answer: B
From H = I²Rt.
From H = I²Rt.
4. Commercial heating devices use:
Answer: B
Nichrome has high resistivity and melting point.
Nichrome has high resistivity and melting point.
5. Electric fuse works on:
Answer: B
Excess current melts fuse wire.
Excess current melts fuse wire.
6. H ∝ time relation:
Answer: A
H = I²Rt.
H = I²Rt.
7. Heating effect maximum when resistance:
Answer: B
H ∝ R.
H ∝ R.
8. Electric iron converts:
Answer: A
Based on Joule heating.
Based on Joule heating.
9. Filament bulb material:
Answer: B
High melting point.
High melting point.
10. Heat produced if current doubles:
Answer: C
Since H ∝ I².
Since H ∝ I².
11. Electric heater uses coil shape to:
Answer: B
Longer wire → more resistance.
Longer wire → more resistance.
12. Fuse connected in:
Answer: B
Protects circuit.
Protects circuit.
13. Heating effect used in:
Answer: D
All appliances use Joule heating.
All appliances use Joule heating.
14. Power dissipated P =
Answer: D
All equivalent forms.
All equivalent forms.
15. Heating effect absent in:
Answer: A
Zero resistance → no heat.
Zero resistance → no heat.
16. Electric kettle uses:
Answer: B
Water heated by Joule heat.
Water heated by Joule heat.
17. Safety device based on heating:
Answer: A
Melts on excess current.
Melts on excess current.
18. Heating loss minimized by:
Answer: A
Low resistance.
Low resistance.
19. Electric blanket works on:
Answer: A
Resistive heating.
Resistive heating.
20. Efficiency of heater increases when:
Answer: A
More heat utilized.
More heat utilized.
