Physics Nios Plus Two PQ III Welcome to your Physics Nios Plus Two PQ III Total Questions: 50 Name Mobile No: 1. Fill in the blanks: A photodiode is always connected in _____________ biasing. high reverse zero forward None Hint 2. Calculate the excess pressure inside a soap bubble of radius 4 cm. The surface tension of soap solution is 25 × 10⁻³ Nm⁻¹. 0.5 N/m² 0.625 N/m² 1.25 N/m² 0.25 N/m² None Hint 3. Calculate the excess pressure inside a soap bubble of radius 4 cm. The surface tension of soap solution is 25 × 10⁻³ Nm⁻¹: 1.25 × 10⁻¹ N/m² 6.25 × 10⁻³ N/m² 5 × 10⁻³ N/m² 3.125 × 10⁻² N/m² None Hint 4. A 110 W electric bulb is connected to a 220 V dc supply. The resistance of the bulb is: 110 Ω 220 Ω 440 Ω 2 Ω None Hint 5. Give any two differences between the way the electric field and the magnetic field deflect a moving charged particle: Electric field only attracts; magnetic field only repels Electric field exerts force on stationary charges; magnetic field exerts force only on moving charges Electric field does not affect charged particles; magnetic field does Both deflect particles in the same way None Hint 6. Write any three distinguishing features of the fringe patterns formed in Young’s double slit experiment and single slit diffraction. All of the above Double slit: bright and dark fringes; Single slit: diffraction pattern Double slit: fringes formed by interference; Single slit: fringes formed by diffraction Double slit: fringes are wider; Single slit: fringes are narrower None Hint 7. Through wave motion: neither energy nor particles are transmitted energy and particles both are transmitted only particles are transmitted only energy is transmitted None Hint 8. The phenomenon responsible for the formation of rainbow is: interference diffraction dispersion polarization None Hint 9. A particle is projected at an angle of 60° to the horizontal with a certain kinetic energy E. Its kinetic energy at the highest point of its path will be: E/2 E/4 E 0 None Hint 10. Fill in the blanks: A forward biased p-n junction offers _________ resistance to the flow of electrons. moderate zero low high None Hint 11. Fill in the blanks: In a nuclear reactor, moderator is used to _____________ the triggering neutrons. absorb reflect slow down speed up None Hint 12. Interference is a phenomenon exhibited by: neither the waves nor the particles particles only waves only waves as well as particles None Hint 13. Minimum number of non-coplanar forces acting on a body to keep it in equilibrium will be: 5 2 3 4 None Hint 14. Give the names of the four factors on which the resistance of a conductor depends. Length, cross-sectional area, temperature, and material Weight, temperature, length, and color Length, color, shape, and material Volume, length, material, and color None Hint 15. Work done in displacing a charge q on an equipotential surface through a distance r will be: 4πε₀rq q / 4πε₀r² q / 4πε₀r Zero None Hint 16. The maximum number of electrons present in the outermost orbit of any atom is: 32 infinite 2 8 None Hint 17. Give in brief the principle of working of Parachute. Parachute changes direction of motion Parachute absorbs energy of fall Parachute decreases air resistance, increasing speed Parachute increases air resistance, reducing speed of fall None Hint 18. A negative charge of 20 μC is placed at a point where the electric potential is 50 V. The electric potential energy of the particle is: 10⁻³ J 10³ J -10⁻³ J 0.5 x 10³ J None Hint 19. State Pascal's law. Name any one device based on this law. Total energy in a system remains constant Pressure applied to a confined fluid is transmitted undiminished in all directions Energy cannot be created or destroyed The pressure of a gas is inversely proportional to its volume None Hint 20. Give the names of the four factors on which the resistance of a conductor depends: Length, weight, material, color Length, cross-sectional area, material, temperature Thickness, color, material, temperature Length, density, color, shape None Hint 21. The ratio of the magnetic fields at the centres of two circular loops of radius 5 cm and 15 cm, carrying current 3 A and 1 A respectively, will be: 1:9 9:1 3:1 1:1 None Hint 22. Distinguish between: (i) Pitch and frequency (ii) Loudness and intensity Pitch and intensity both relate to loudness Pitch relates to intensity; Loudness relates to frequency Pitch and loudness both relate to frequency Pitch relates to frequency; Loudness relates to intensity None Hint 23. Fill in the blanks: In fission reaction, the energy released is 0.84 MeV/u whereas in fusion reaction, the energy released is _________ MeV/u. 2 10 4 8 None Hint 24. Are the various devices in a household circuit connected in series or in parallel? Why? Neither Series Parallel Both None Hint 25. What is meant by: (i) an isothermal process (ii) an adiabatic process (i) Constant pressure process (ii) Constant volume process (i) Constant temperature process (ii) No heat exchange process (i) No heat exchange process (ii) Constant temperature process (i) Constant volume process (ii) Constant pressure process None Hint 26. State de-Broglie's concept of matter waves. Write expression for de-Broglie wavelength associated with an electron accelerated through a potential difference of V volts. Wavelength λ = h / eV Wavelength λ = h / mv Wavelength λ = h / p Wavelength λ = h / √(2meV) None Hint 27. Write true for correct statement and false for incorrect statement: (i) A NOT gate uses two p-n junctions (ii) When a Zener diode is not working on its optimum voltage condition, the load draws less power than the power dissipated in the diode. Both (1) and (2) are true (1) is true, (2) is false (1) is false, (2) is true Both (1) and (2) are false None Hint 28. Use of a p-n junction diode Oscillator Stabilizer Rectifier Receiver for remote None Hint 29. A body of mass 50 kg is placed on the smaller piston of a hydraulic lift. If the area of the smaller piston is 0.1 m² and that of the bigger piston is 10 m², calculate the weight of the car which can be lifted by this body: 50 N 5000 N 50000 N 500 N None Hint 30. The electrostatic force between two point charges kept in air at a distance ‘d’ is F1 and F2 at the same distance in a medium of dielectric constant K. The ratio F1 : F2 is equal to: 1:1 1:K K²:1 K:1 None Hint 31. Give any two differences between the way the electric field and the magnetic field deflect a moving charged particle. Magnetic field deflects only neutral particles Both deflect particles regardless of velocity Electric field deflects irrespective of velocity; magnetic field deflects only if velocity is present Electric field does not deflect charged particles None Hint 32. Consider a body suspended from a vertical spring. How will the position of the body change when a current is passed through the spring? Explain. Position changes depending on magnetic effect Position remains same Body moves up Body moves down None Hint 33. Distinguish between: (i) Pitch and frequency (ii) Loudness and intensity Pitch depends on frequency, frequency is physical; Loudness is psychological, intensity is physical Pitch depends on amplitude; Loudness depends on wavelength Pitch and frequency are same; Loudness and intensity are same Frequency depends on pitch; Intensity depends on loudness None Hint 34. Apparent breach of the law of conservation of energy in beta-decay reactions led to the discovery of: Neutron Proton Electron Neutrino None Hint 35. A body of mass ‘m’ just starts sliding down an inclined plane when the plane makes an angle of 30° with the vertical. The coefficient of friction between the surface of the plane and the block will be: √3 mg 1/√3 √3 mg/√3 None Hint 36. A body of mass 50 kg is placed on the smaller piston of a hydraulic lift. If the area of the smaller piston is 0.1 m² and that of the bigger piston is 10 m², calculate the weight of the car which can be lifted by this body. 50000 N 500 N 50 N 5000 N None Hint 37. Give in brief the principle of working of Parachute. Absorbs impact on landing Converts kinetic energy to heat Decreases air resistance to speed descent Increases air resistance to slow descent None Hint 38. A parallel beam of white light is incident on a convex lens. Which of the following colours will converge nearest to its optical focus? Green Blue Yellow Red None Hint 39. The law of conservation of energy is applicable to: Mechanical systems only Chemical systems only Every system of the universe Nuclear systems only None Hint 40. The number of electrons that constitute -1 C of charge is: 6.25 x 10¹⁸ 1.6 x 10¹⁹ 9.0 x 10¹⁸ 6.4 x 10²⁷ None Hint 41. A resistance of 5 Ω is connected in the left gap and that of 15 Ω is connected in the right gap of a metre-bridge. The position of the null point on the bridge wire from its left end will be: 60 cm 75 cm 15 cm 25 cm None Hint 42. State Stoke's law. Mention any two of its applications. Stoke's law explains heat conduction; used in thermodynamics and engines Stoke's law relates to magnetic fields; used in electromagnetics and motors Stoke's law describes the motion of particles in a fluid; used in viscosity measurement and settling velocity Stoke's law explains sound waves; used in acoustics and sonar None Hint 43. State: (i) Zeroth law of thermodynamics (ii) First law of thermodynamics Heat cannot flow; Heat can flow freely Pressure and volume relation; Temperature and entropy relation Thermal equilibrium concept; Conservation of energy Energy is created; Energy is destroyed None Hint 44. Complete the following two sentences using the words given in the bracket (4.18, 4180, increases, decreases): 1 k Calorie = _____________joules 418 joules 41.8 joules 4180 joules 4.18 joules None Hint 45. What is meant by photoelectric emission? What does it indicate – particle nature of wave or wave nature of particle? Emission of electrons from metal surface when light shines; particle nature Reflection of light from a surface; particle nature Absorption of electrons; wave nature Emission of photons from a metal surface; wave nature None Hint 46. In which of the following situations work is done against gravity of earth? A person lifts a load to a certain height in an earth’s natural satellite A car moves on a horizontal level road A monkey climbs up a tree A person tries to lift a heavy load but fails to do so None Hint 47. A force of 5 N is applied on a body of mass 2 kg. The acceleration of the body will be: 10.0 ms⁻² 2.5 ms⁻² 0.4 ms⁻² 0.0 ms⁻² None Hint 48. Complete the following two sentences using the words given in the bracket (4.18, 4180, increases, decreases): When work is done on a system, the internal energy of the system: increases becomes zero decreases remains constant None Hint 49. Use of a transistor Receiver for remote Rectifier Oscillator Stabilizer None Hint 50. Half-life of a radioactive element is 2 years. What fraction of its mass will be left after 8 years? 1/16 1/256 1/8 1/2 None Hint Time's up Share: admin Previous post Business Studies Nios plus two PQ VI July 3, 2025 Next post Chemistry Nios Plus Two PQ July 5, 2025
