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