12th physics chapter 8: cover all important question with new latest pattern. you can download physics chapter 8 notes & full solution as PDF format in English. below we are goin to cover chapter 8 physics class 12 Bihar board
Bihar board Physics chapter 8 class 12: specially we focused on Bihar board latest pattern of physics, and on this post covered class 12th physics chapter 8 based on Bihar board. check out below to get full solutions of physics chapter 8 class 12 bihar board.
12th physics chapter 8 Bihar board with NCERT-Details & Highlights
| name of content | 12th physics chapter 8 full solution |
| content | physics objective type MCQ question with answer |
| name of subjects | class 12 physics |
| important for exam | Bihar board & other state board |
| pattern & Level | NCERT & State level question |
12th physics chapter 8 all objective solutions – download PDF
1. Maxwell in his famous equations of electromagnetism introduced the concept of
-
- (a) ac current
- (b) displacement current
- (c) impedance
- (d) reactance
Answer: (b) displacement current
2. The conduction current is same as displacement current when source is
-
- (a) ac only
- (b) dc only
- (c) either ac or dc
- (d) neither dc nor ac
Answer: (c) either ac or dc
3. If a variable frequency ac source is connected to a capacitor then with decrease in frequency the displacement current will
-
- (a) increase
- (b) decrease
- (c) remains constant
- (d) first decrease then increase
Answer: (b) decrease
4. An electromagnetic wave can be produced, when charge is
-
- (a) moving with a constant velocity
- (b) moving in a circular orbit
- (c) falling in an electric field
- (d) both (b) and (c)
Answer: (d) both (b) and (c)
5. Which of the following statement is false for the properties of electromagnetic waves?
-
- (a) Both electric and magnetic field vectors attain the maxima and minima at the same place and same time.
- (b) The energy in electromagnetic waves is divided equally between electric and magnetic field vectors.
- (c) Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave.
- (d) These waves do not require any material medium for propagation.
Answer: (c) Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave.
6. Which of the following has/have zero average value in a plane electromagnetic wave?
(a) Both magnetic and electric fields
(b) Electric field only
(c) Magnetic field only
(d) None of these
Answer: (a) Both magnetic and electric fields
7. A charged particle oscillates about its mean equilibrium position with a frequency of 109 The frequency of electromagnetic waves produced by the oscillator is
-
- (a) 106 Hz
- (b) 107 Hz
- (c) 108 Hz
- (d) 109 Hz
Answer: (d) 109 Hz
8. The ultra high frequency band of radio waves in electromagnetic wave is used as in
-
- (a) television waves
- (b) cellular phone communication
- (c) commercial FM radio
- (d) both (a) and (c)
Answer: (b) cellular phone communication
9. The waves used by artificial satellites for communication is
-
- (a) microwaves
- (b) infrared waves
- (c) radio waves
- (d) X-rays
Answer: (a) microwaves
10. Which of the following electromagnetic waves is used in medicine to destroy cancer cells?
-
- (a) IR-rays
- (b) Visible rays
- (c) Gamma rays
- (d) Ultraviolet rays
Answer: (c) Gamma rays
11. Which has the longest wavelength?
-
- (A) Radio waves
- (B) X-rays
- (C) Ultraviolet rays
- (D) Infrared
Answer: (A) Radio waves
12. Which of the following has a minimum wavelength?
-
- (A) X-Rays
- (B) Y-Rays
- (C) Micro Wave
- (D) Radio wave
Answer: (B) Y-Rays
bihar board 12th physics chapter 8 most mcq solution
13. The frequency range of microwaves (in hertz) is
-
- (A) 3 × 108 – 4 x 104
- (B) 7.5 x 104 – 3.8 x 1011
- (C) 3 x 1021 – 3 x 1018
- (D) 3 x 1012 – 3 x 1010
Answer: (D) 3 x 1012 – 3 x 1010
14. Wavelength range in meter for green light is
-
- (A) 4x 10-7– 4.5 x 10-7
- (B) 4.5 x 10-7 – 5 x 10-7
- (C) 5 x 10-7 – 5.7 x 10-7
- (D) None of these
Answer: (C) 5 x 10-7 – 5.7 x 10-7
15. According to the law of electromagnetism, the speed of electromagnetism in all the inertial frames is
-
- (A) Same
- (B) different
- (C) not definite
- (D) None of these.
Answer: (A) Same
16. Maxwell equations represent four laws of electromagnetism. Maxwell Ampere law relates
-
- (A) The rate of change of magnetic flux to total current
- (B) The rate of change of magnetic flux to displacement current
- (C) the rate of change of magnetic flux to current
- (D) None of these
Answer: (A) The rate of change of magnetic flux to total current
17. Unit of displacement current is
-
- (A) A
- (B) AM
- (C) Om/A
- (D) I
Answer: (A) A
18. Which of the following are used to make labs free from bacteria?
-
- (A) UV rays
- (B) IR rays
- (C) X-rays
- (D) none
Answer: (A) UV rays
19. The propagation of the electromagnetic wave is along
-
- (A) normal to electric field only
- (B) normal to magnetic field only
- (C) normal to both the electric, and magnetic field
- (D) None of these
Answer: (C) normal to both the electric, and magnetic field
20. Which is a wrong statement?
-
- (A) Electromagnetic waves are transverse
- (B) Electromagnetic waves travel in a vacuum at the speed of light
- (C) The speed of the electromagnetic wave is the same in all media
- (D) Electromagnetic waves are emitted by accelerated charges
Answer: (C) The speed of the electromagnetic wave is the same in all media
21. The water molecule in foods have a rotational frequency in the range of
-
- (A) ultraviolet waves
- (B) infrared waves
- (C) microwaves
- (D) visible waves
Answer: (C) microwaves
22. The frequency of the microwave is
-
- (A) less than that of radiowaves
- (B) more than that of radiowaves para
- (C) more than that of light waves
- (D) less than the range of audible waves
Answer: (B) more than that of radiowaves para
23. Which of the following is not shown by electromagnetic waves?
-
- (A) reflection
- (B) polarization
- (C) diffraction
- (D) None of these
Answer: (D) None of these
24. The energy of electromagnetic radiation is 13.2 keV. This radiation is related to which region of the spectrum ?
-
-
- (A) Visible
- (B) X-rays
- (C) Ultra violet
- (D) Infrared
-
Answer: (B) X-rays
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Bihar board 12th physics chapter 8 complete objective
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Bihar board 12th science stream subjects wise solution
click here to check out Bihar board science stream all subjects solutions
| SL.N. | Subject name with solutions |
| 01 | Physics |
| 02 | Chemistry |
| 03 | Biology |
| 04 | Math |
| 05 | Hindi |
| 06 | English |