12th physics chapter 7: full solution, notes, MCQ, & free PDF | Bihar board

Physics class 12

12th physics chapter 7: cover all important question with new latest pattern. you can download physics chapter 7 notes & full solution as PDF format in English. below we are goin to cover chapter 7 physics class 12 Bihar board

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Bihar board Physics chapter 7 class 12: specially we focused on Bihar board latest pattern of physics, and on this post covered class 12th physics chapter 7 based on Bihar board. check out below to get full solutions of physics chapter 7 class 12 bihar board.

12th physics chapter 7 Bihar board with NCERT-Details & Highlights

name of content 12th physics chapter 7 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 7 all objective solutions – download PDF

1. Alternating voltage (V) is represented by the equation

    • (a) V(t) = Vm eωt
    • (b) V(t) = Vm sin ωt
    • (c) V(t) = Vm cot ωt
    • (d) V(t) = Vm tan ωt

Answer: (b) V(t) = Vm sin ωt

2. In the case of an inductor

    • (a) voltage lags the current by π/2
    • (b) voltage leads the current by π/2
    • (c) voltage leads the current by π/3
    • (d) voltage leads the current by π/4

Answer: (b) voltage leads the current by π/2

3. In a pure capacitive circuit if the frequency of ac source is doubled, then its capacitive reactance will be

    • (a) remains same
    • (b) doubled
    • (c) halved
    • (d) zero

Answer: (c) halved

4. In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit?

    • (a) Only resistor
    • (b) Resistor and inductor
    • (c) Resistor and capacitor
    • (d) Only inductor

Answer: (c) Resistor and capacitor

5. In which of the following circuits the maximum power dissipation is observed?

    • (a) Pure capacitive circuit
    • (b) Pure inductive circuit
    • (c) Pure resistive circuit
    • (d) None of these

Answer: (c) Pure resistive circuit

6. In a series LCR circuit the voltage across an inductor, capacitor and resistor are 20 V, 20 V and 40 V respectively. The phase difference between the applied voltage and the current in the circuit is

    • (a) 30°
    • (b) 45°
    • (c) 60°
    • (d) 0°

Answer: (d) 0°

7. At resonance frequency the impedance in series LCR circuit is

    • (a) maximum
    • (b) minimum
    • (c) zero
    • (d) infinity

Answer: (b) minimum

8. At resonant frequency the current amplitude in series LCR circuit is

    • (a) maximum
    • (b) minimum
    • (c) zero
    • (d) infinity

Answer: (a) maximum

9. Quality factor and power factor both have the dimensions of

    • (a) time
    • (b) frequency
    • (c) work
    • (d) angle

Answer: (d) angle

10. A transformer works on the principle of

    • (a) self induction
    • (b) electrical inertia
    • (c) mutual induction
    • (d) magnetic effect of the electrical current

Answer: (c) mutual induction

bihar board 12th physics chapter 7 mcq solution

11. For an ideal-step-down transformer, the quantity which is constant for both the coils is

    • (a) current in the coils
    • (b) voltage across the coils
    • (c) resistance of coils
    • (d) power in the coils

Answer: (d) power in the coils

12. In an LCR series ac circuit, the voltage across each of the components L, C and R is 50 Volt. The voltage across LC combination is :

    • (A) 50 Volt
    • (B) 25 Volt
    • (C) 100 Volt
    • (D) 0 Volt

Answer: (D) 0 Volt

13. The phase difference between current and voltage in an AC circuit is θ. Then power factor will be:

    • (A) cosθ
    • (B) sinθ
    • (C) tanθ
    • (D) 1 θ

Answer: (A) cosθ

14. The working principle of choke coil is based on 

    • (A) Conservation of angular momentum
    • (B) Self induction
    • (C) Mutual induction
    • (D) Conservation of momentum

Answer: (B) Self induction

15. In a step up transformer the number of coils in primary coils is N1 and N2 in secondary. Then :-

    • (A) N1 = N2
    • (B) N1 < N2
    • (C) N1 > N2
    • (D) None of these

Answer: (B) N1 < N2

16. The device that increases AC voltage is called – 

    • (A) resistor
    • (B) step-down transformer
    • (C) step-up transformer
    • (D) transformer

Answer: (C) step-up transformer

17. The oscillation frequency of an LC circuit is f. If both the capacitance and inductance be doubled, the frequency will become –

    • (A) f / 4
    • (B) 2f
    • (C) 4f
    • (D) f / 2

Answer: (D) f / 2

18. In LCR-circuit, L = 8.0 H, C = 0.5 μF, and R = 100 Ω are connected in series. The resonant frequency will be

    • (A) 600 radian/second
    • (B) 500 radian/second
    • (C) 600 hertz
    • (D) 500 hertz

Answer: (B) 500 radian/second

19. A choke coil is used to control current in a circuit of 

    • (A) ac only
    • (B) dc only
    • (C) both ac and dc
    • (D) None of these

Answer: (A) ac only 

20. Step-down transformer increases 

    • (A) current
    • (B) voltage
    • (C) wattage
    • (D) None of these

Answer: (A) current

bseb 12th physics chapter 7 important answer key 

21. The thermal effect of alternating current is practically 

    • (A) Joule heating
    • (B) Peltier heating
    • (C) Thomson effect
    • (D) None of these

Answer: (A) Joule heating

22. The power factor of a choke coil is about 

    • (A) 90°
    • (B) 0
    • (C) 1
    • (D) 180°

Answer: (B) 0

23. The power factor of a condenser is 

    • (A) 90°
    • (B) 1
    • (C) 180°
    • (D) 0

Answer: (D) 0

24. For which of the following, capacitor works as infinite resistance ?

    • (A) DC
    • (B) AC
    • (C) both DC and AC
    • (D) None of these

Answer: (A) DC 

25. L-C circuit without AC-source is called 

    • (A) oscillatory circuit
    • (B) drift circuit
    • (C) hysteresis circuit
    • (D) None of these

Answer: (A) oscillatory circuit

26. The unit of Impedance is 

    • (A) henry
    • (B) ohm
    • (C) tesla
    • (D) None of these

Answer: (B) ohm

27. The equation of an AC is I = 60sin100πt. The root mean square value will be 

    • (A) 60√2
    • (B) 60 / √2
    • (C) 100
    • (D) zero

Answer: (B) 60 / √2

28. The value of phase difference between current and emf in an AC circuit with resistance only, is

    • (A) zero
    • (B) π / 2
    • (C) π
    • (D) 2π

Answer: (A) zero

29. The unit of reactance is 

    • (A) ohm
    • (B) farad
    • (C) ampere
    • (D) mho

Answer: (A) ohm

30. The unit of capacitive reactance is 

    • (A) farad
    • (B) ohm
    • (C) maxwell
    • (D) ampere

Answer: (B) ohm

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Bihar board 12th physics chapter 7 complete objective

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Bihar board 12th science stream subjects wise solution

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01 Physics
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03 Biology
04 Math
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