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Monday, 29 November 2021

PHYSICS REVISION TEST PAPER WITH ANSWER KEY

 Term I Exam Revision Test Paper 1 Class XII Subject Physics Time 1.5 hr Multiple Choice Questions MM 35 


1. The scientist whose name is not associated with the electromagnetic waves is 

  • a) Hertz
  • b) Jagdish Chandra Bose 
  • c) Marconi 
  • d) Huygens 

  • d) Huygens 

2. Dielectric constant of a metal is 

  • a) 1
  •  b) 0 
  • c) ∞ 
  • d) Indefinite 

  • c) ∞ 


3. Which is one of the best materials for making connecting wires?

  • a) Manganin 
  • b) Constantan 
  • c) Copper 
  • d) Nichrome 

  • c) Copper


4. If an electron is brought toward an another electron, the electric potential energy of the system 

  • a) Increases 
  • b) decreases 
  • c) become zero 
  • d) remains the same 

  • a) Increases 


5. Kirchhoff’s first law is based on 

  • a) the law of conservation of momentum 
  • b) the law of conservation of electric charge 
  • c) principle of quantisation of charge 
  • d) the law of conservation of kinetic energy 

  • b) the law of conservation of electric charge 

6. Principle of Wheatstone’s bridge is used in 

  • a) Galvanometer 
  • b) Meter Bridge 
  • c) ammeter 
  • d) voltmeter 

  • b) Meter Bridge 


 7 . Magnetic susceptibility of a paramagnetic substance is 

  • a) small and positive 
  • b) small and negative 
  • c) large and positive 
  • d) large and negative 

  • a) small and positive 


8. Value of Bohr magneton is

  •  a) 𝑒ℎ/2𝜋𝑚𝑒 
  •  b) 𝑒ℎ/2𝑚𝑒 
  •  c) 𝑒ℎ/4𝜋𝑚𝑒 
  •  d) None of these 

  • c) 𝑒ℎ/4𝜋𝑚𝑒 


9. Weber m⁻² is equal to 

  • a) tesla 
  • b) henry 
  • c) watt 
  • d) dyne 

  • a) tesla 


10. An induction furnace works on the principle of 

  •  a) eddy currents 
  • b) Faraday's laws 
  • c) self-induction 
  • d) mutual induction 

  •  a) eddy currents

11. The direction of induced e.m.f is given by 

  •  a) Coulomb's laws 
  • b) lenz's law 
  • c) Lorentz’s law 
  • d) Ampere’s law 

  • b) lenz's law 


12. What is a shunt? 

  • a) low resistance 
  • b) high resistance 
  • c) Both 
  • d) none of these 
  • a) low resistance 


13. Which of the following have shortest frequency? 

  • a) microwaves 
  • b) visible light 
  • c) X-rays 
  • d) gamma rays 
  • a) microwaves 

14. Torque acting on a dipole placed in electric field is maximum when angle between 𝑃⃗⃗ and 𝐸⃗⃗⃗ is                      

  • a) 0⁰ 
  • b) 90⁰ 
  • c) 45⁰ 
  • d) 180⁰  

  • b) 90⁰ 


15. When area of cross-section of copper wire is doubled, keeping its length same, then its resistance is

  •  a) Doubled 
  • b) halved 
  • c) no change 
  • d) one of these 

  • a) Doubled 

16. A charge Q is enclosed by a gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will 

  •  a) increase four times 
  • b) be reduced to half 
  • c) remain the same 
  • d) be doubled 

  • c) remain the same 

17. An electric dipole placed in a non uniform electric field experiences 

  • a) both , a torque and a net force 
  • b) only a force but no torque 
  • c) only a torque but no net force 
  • d) no torque and no net force 

  • a) both , a torque and a net force 


18. The physical quantity which has unit NC⁻ ¹ is 

  • a) Electric potential 
  • b) Electric field 
  • c) Force 
  • d) Work 

  • b) Electric field 


19. With increase in temperature, the resistivity of a conductor 

  • a) Increases 
  • b) decreases 
  • c) may increase or decrease 
  • d) does not change 

  • a) Increases 


20. The specific resistance of a material depends on: 

  • a) length of the conductor 
  • b) area of cross section of the conductor 
  • c) both length and area of the conductor 
  • d) nature and temperature of the material 

  • d) nature and temperature of the material 


21. Resistance of a semiconductor decreases with the rise of temperature, because 

  • a) relaxation time and electron density decrease 
  • b) relaxation time and electron density increases 
  • c) electron density decreases and relaxation time increases, the second factor dominates the first. 
  •  d) electron density increases and relaxation time decreases, the first factor dominates the second 

  • d) electron density increases and relaxation time decreases, the first factor dominates the second 


22. The path of an electron in a uniform magnetic field may be 

  • a) circular but not helical 
  • b) helical but not circular 
  • c) neither helical nor circular 
  • d) either helical or circular 

  • d) either helical or circular 

23. A permanent magnet has the properties of retentivity and coercivity, which in magnitude are respectively 

  • a) high - high 
  • b) Low - low 
  • c) Low – high 
  • d) High - low 

  • c) Low – high 


24. Two streams of electrons moving parallel to each other in opposite direction will 

  • a) attract each other 
  • b) repel each other 
  • c) cancel the magnetic field of each other 
  • d) cancel the electric field of each other 

  • b) repel each other 


 25. At which place on earth, the earth’s magnetic field becomes horizontal 

  • a) magnetic pole 
  • b) geographical pole 
  • c) magnetic meridian 
  • d) magnetic equator 

  • d) magnetic equator 


26. Phase difference between the voltage drop across L and R in a series LCR circuit connected to an a.c. source is 

  • a) 0⁰
  •  b) 180⁰ 
  •  c) 90⁰ 
  •  d) 360⁰ 

  •  c) 90⁰ 


27. Power factor is 1 for 

  • a) pure inductor 
  • b) pure capacitor 
  • c) pure resistor 
  • d)either an inductor or a capacitor 

  • c) pure resistor 


28. The core used in transformers and other electromagnetic devices is laminated, so as 

  • a) to reduce the magnetism in the core 
  • b) to reduce eddy current losses in the core 
  •  c) to increase the magnetic field 
  • d) to increase the magnetic flux 

 

  • b) to reduce eddy current losses in the core 


29. A galvanometer having a resistance of 100 Ω gives full scale deflection with 0.01 A current. How much resistance should be connected to convert it into an ammeter of range 10 A ? 

  • a) 0.1Ω in parallel 
  • b) 0.1Ω in series 
  • c) 10 Ω in parallel 
  • d) 10 Ω in series 

  • a) 0.1Ω in parallel 


30. The rms value of an a.c.is 5 A. Its maximum value will be 

  • a) 10 A 
  • b) 5 √2 A 
  • c) 5 / √2 A 
  • d) 5 √3 A 

  • b) 5 √2 A 


31. How many electrons are there in a charge of -1 micro coulomb? 

  • a) 6.25 × 10¹² 
  • b) 1.6 × 10⁻¹³ 
  • c) 6.25 × 10¹⁸ 
  • d) 1.6 × 10¹³ 

  • a) 6.25 × 10¹² 


32. There are two charges of + 4 micro coulomb and + 2 micro coulomb separated by a distance of 0.1 m in air. The ratio of the forces acting on them will be 

  • a) 4:1 
  • b) 2:1 
  • c) 1:2 
  • d) 1:1 

  • a) 4:1 


33. A source is transmitting electromagnetic waves of frequency 9 ×10⁶ Hz. Then the wavelength of the electromagnetic waves transmitted from the source will be 

  • a) 36.6 m 
  • b) 40. 5 
  • c) 33.3 m 
  • d) 50.9 m

  • c) 33.3 m 


34.A wire of resistance 1 ohm is elongated by 10%. The resistance of the elongated wire is 

  • a) 11 Ω 
  • b) 11.1 Ω 
  • c) 1.21 Ω 
  • d) 13.1 Ω 

  • c) 1.21 Ω 


 35. A proton enters a uniform magnetic field of 5 T at right angle to the field with a speed of 4× 10⁷ ms⁻¹ . What is the magnetic force acting on the proton? Given that charge on the proton = 1.6 × 10⁻¹⁹ C 

  • a) 3.2 ×10⁻ ¹³ N 
  • b) 2.3 × 10⁻ ¹³ N 
  • c) 3.0 x 10⁻ ¹¹ N 
  • d) 3.2 x 10⁻ ¹¹  N 

  • d) 3.2 x 10⁻¹¹ N 


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