Class 12th Physics Objective Question and Answer

Class 12th Physics Objective Question and physics MCQ questions and answers, physics objective question for class 12, Class 12th Quiz English Medium, With the help of these notes, you can also prepare for your board exam and class 12th level competition examination, you will get these notes in English.

Class 12th Physics Objective Questions and Answers | physics MCQ questions and answers | physics objective question for class 12 |12th Physics Objective Questions | 12th board VVI question 2022.

Physics Objective Question For Class 12

1. The unit for an electrical field is :

  • volt
  • Ampere
  • ohm
  • NC⁻¹
View Answer
NC⁻¹

2. When a conductor is heated, its resistance :

  • Increases
  • decreases
  • remains constant
  • depends upon the nature of the conductor
View Answer
Increases

3. The electrical potential at a point inside a charged spherical shell is :

  • Zero
  • Constant
  • Variable
  • Maximum
View Answer
Zero

4. What is the SI unit of magnetic dipole moment :

  • Am²
  • Am
  • Am⁻²
  • None
View Answer
Am²

5. Mention the S.I unit of a magnetic field :

  • gauss
  • Tesla
  • Weber
  • None
View Answer
Tesla

6. Kirchoff loop rule is a direct consequence of low of conservation of :

  • Charge
  • Momentum
  • Angular Momentum
  • Energy
View Answer
energy

7. Lenz’s law is in accordance with the low of conservation of :

  • Momentum
  • Angular Momentum
  • Charge
  • Energy
View Answer
energy

8. Which of the Following can be Deflected by a magnetic field :

  • α – rays
  • β – rays
  • γ – rays
  • a & b Both
View Answer
a & b Both

9. Name the electromagnetic radiation used for viewing objects through haze & fog :

  • Infrared
  • rays
  • x-rays
  • Microwaves None
View Answer
Infrared

10. Which Colour of light gets deviated the most when sunlight passes through a prism :

  • Red
  • Yellow
  • Violet
  • Green
View Answer
Violet

11. The radius of curvature of a mirror is 20 cm. What is its Focal length :

  • 5 cm
  • 10 cm
  • 20 cm
  • None
View Answer
10 cm

12. Electron & Proton are moving at the same speed. Which we having more Wavelength.

  • Electron
  • Proton
  • Both Have Same
  • None Of This
View Answer
Electron

13. Which series of H-atom spectrum lies in the ultra-violet region :

  • Balmer series
  • Lyman series
  • Pascher series
  • None of this
View Answer
Lyman series

14. What is Called Ratio Of Potential difference & Current :

  • Resistance
  • Resistivity
  • Conduction
  • none
View Answer
Resistance

15. Electric current is Scalar or Vector :

  • vector
  • scalar
  • neither vector & scalar
  • none
View Answer
scalar

16. If a wire stretched by a force, its resistance :

  • Increases
  • decreases
  • remains constant
  • None
View Answer
Increases

17. The unit of electrical current density is :

  • Am²
  • Am
  • Am⁻²
  • Am⁻¹
View Answer
Am⁻²

18. As temperature increases the conductivity of a semiconductor :

  • Increases
  • decreases
  • remains constant
  • None
View Answer
Increases

19. Potential gradient has unit :

  • vm
  • vm⁻¹
  • vm⁻²
  • vm²
View Answer
vm⁻¹

20. The SI unit for impedance is :

  • ohm
  • Henry
  • Volt
  • Ampere
View Answer
ohm

21. The Caused of induced emf in a closed coil is :

  • Magnetic field
  • Magnetic flux
  • Rotation of coil
  • Change in Magnetic flux
View Answer
Magnetic flux

22. The absolute permeability of free space in S.I units is :

  • 1⁄4π×₁₀⁻⁷
  • ₁₀⁻⁷
  • 4π×₁₀⁻⁷
  • 4π×₁₀⁷
View Answer
4π×₁₀⁻⁷

23. Which part of the electromagnetic spectrum is used in a radar system?

  • Ultraviolet
  • infrared
  • Radio waves
  • x rays
View Answer
Radio waves

24. Critical Angle (C) and refractive index (µ) of medium are related as :

  • µ = sin c
  • µ = cos c
  • µ = tan c
  • µ = cosec c
View Answer
µ = cosec c

25. MeV is the unit for :

  • Voltage
  • Current
  • Power
  • Energy
View Answer
energy

26. Farad is unit for :

  • Electric current
  • electric potential
  • Energy
  • capacitance
View Answer
capacitance

27. A positively charged body has :

  • excess of electron
  • deficit of electrons
  • excess of proton
  • deficit of proton
View Answer
excess of protony

28. As a temperature rises, the resistance of a conductor :

  • Increases
  • decreases
  • remains constant
  • depends upon the nature of the conductor
View Answer
Increases

29. Zener diode is used for :

  • Oscillations
  • amplifications
  • rectification
  • voltage stabilization.
View Answer
voltage stabilization

30. eV is a unit for :

  • potential difference
  • power
  • energy
  • momentum
View Answer
energy

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