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

2. When a conductor is heated, its resistance :

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

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

• Zero
• Constant
• Variable
• Maximum

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

• Am²
• Am
• Am⁻²
• None

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

• gauss
• Tesla
• Weber
• None

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

• Charge
• Momentum
• Angular Momentum
• Energy

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

• Momentum
• Angular Momentum
• Charge
• Energy

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

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

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

• Infrared
• rays
• x-rays
• Microwaves None

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

• Red
• Yellow
• Violet
• Green

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

• 5 cm
• 10 cm
• 20 cm
• None

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

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

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

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

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

• Resistance
• Resistivity
• Conduction
• none

15. Electric current is Scalar or Vector :

• vector
• scalar
• neither vector & scalar
• none

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

• Increases
• decreases
• remains constant
• None

17. The unit of electrical current density is :

• Am²
• Am
• Am⁻²
• Am⁻¹

18. As temperature increases the conductivity of a semiconductor :

• Increases
• decreases
• remains constant
• None

19. Potential gradient has unit :

• vm
• vm⁻¹
• vm⁻²
• vm²

20. The SI unit for impedance is :

• ohm
• Henry
• Volt
• Ampere

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

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

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

• Ultraviolet
• infrared
• Radio waves
• x rays

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

25. MeV is the unit for :

• Voltage
• Current
• Power
• Energy

26. Farad is unit for :

• Electric current
• electric potential
• Energy
• capacitance

27. A positively charged body has :

• excess of electron
• deficit of electrons
• excess of proton
• deficit of proton

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

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

29. Zener diode is used for :

• Oscillations
• amplifications
• rectification
• voltage stabilization.

30. eV is a unit for :

• potential difference
• power
• energy
• momentum

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