Physics Nios Plus Two PQ III Welcome to your Physics Nios Plus Two PQ III Total Questions: 50 Name Mobile No: 1. What is meant by photoelectric emission? What does it indicate – particle nature of wave or wave nature of particle? Absorption of electrons; wave nature Reflection of light from a surface; particle nature Emission of electrons from metal surface when light shines; particle nature Emission of photons from a metal surface; wave nature None Hint 2. A 110 W electric bulb is connected to a 220 V dc supply. The resistance of the bulb is: 220 Ω 110 Ω 2 Ω 440 Ω None Hint 3. 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 does not deflect charged particles Electric field deflects irrespective of velocity; magnetic field deflects only if velocity is present None Hint 4. Interference is a phenomenon exhibited by: waves as well as particles neither the waves nor the particles particles only waves only None Hint 5. Apparent breach of the law of conservation of energy in beta-decay reactions led to the discovery of: Neutrino Proton Neutron Electron None Hint 6. State: (i) Zeroth law of thermodynamics (ii) First law of thermodynamics Energy is created; Energy is destroyed Thermal equilibrium concept; Conservation of energy Heat cannot flow; Heat can flow freely Pressure and volume relation; Temperature and entropy relation None Hint 7. 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 8. The number of electrons that constitute -1 C of charge is: 1.6 x 10¹⁹ 6.4 x 10²⁷ 9.0 x 10¹⁸ 6.25 x 10¹⁸ None Hint 9. Through wave motion: only energy is transmitted neither energy nor particles are transmitted only particles are transmitted energy and particles both are transmitted None Hint 10. 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 2 4 8 None Hint 11. Give any two differences between the way the electric field and the magnetic field deflect a moving charged particle: Electric field exerts force on stationary charges; magnetic field exerts force only on moving charges Both deflect particles in the same way Electric field does not affect charged particles; magnetic field does Electric field only attracts; magnetic field only repels None Hint 12. Half-life of a radioactive element is 2 years. What fraction of its mass will be left after 8 years? 1/2 1/8 1/256 1/16 None Hint 13. Fill in the blanks: A forward biased p-n junction offers _________ resistance to the flow of electrons. low high zero moderate None Hint 14. Use of a transistor Oscillator Stabilizer Receiver for remote Rectifier None Hint 15. 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) No heat exchange process (ii) Constant temperature process (i) Constant volume process (ii) Constant pressure process None Hint 16. Write any three distinguishing features of the fringe patterns formed in Young’s double slit experiment and single slit diffraction. Double slit: fringes formed by interference; Single slit: fringes formed by diffraction Double slit: bright and dark fringes; Single slit: diffraction pattern All of the above Double slit: fringes are wider; Single slit: fringes are narrower None Hint 17. 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 18. 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 0.5 N/m² 0.625 N/m² 1.25 N/m² None Hint 19. Use of a p-n junction diode Stabilizer Rectifier Receiver for remote Oscillator None Hint 20. 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 1:9 9:1 1:1 None Hint 21. 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 remains same Body moves down Body moves up Position changes depending on magnetic effect None Hint 22. Give the names of the four factors on which the resistance of a conductor depends: Length, weight, material, color Length, density, color, shape Thickness, color, material, temperature Length, cross-sectional area, material, temperature None Hint 23. Minimum number of non-coplanar forces acting on a body to keep it in equilibrium will be: 5 3 2 4 None Hint 24. 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 monkey climbs up a tree A car moves on a horizontal level road A person tries to lift a heavy load but fails to do so None Hint 25. 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 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 5 × 10⁻³ N/m² 3.125 × 10⁻² N/m² None Hint 27. The law of conservation of energy is applicable to: Every system of the universe Mechanical systems only Chemical systems only Nuclear systems only None Hint 28. 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 1:K K:1 None Hint 29. Are the various devices in a household circuit connected in series or in parallel? Why? Neither Both Parallel Series None Hint 30. Fill in the blanks: A photodiode is always connected in _____________ biasing. forward reverse high zero None Hint 31. State Stoke's law. Mention any two of its applications. Stoke's law relates to magnetic fields; used in electromagnetics and motors 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 explains heat conduction; used in thermodynamics and engines None Hint 32. The maximum number of electrons present in the outermost orbit of any atom is: 8 32 infinite 2 None Hint 33. 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 500 N 50000 N None Hint 34. Distinguish between: (i) Pitch and frequency (ii) Loudness and intensity Frequency depends on pitch; Intensity depends on loudness Pitch and frequency are same; Loudness and intensity are same Pitch depends on frequency, frequency is physical; Loudness is psychological, intensity is physical Pitch depends on amplitude; Loudness depends on wavelength None Hint 35. Give in brief the principle of working of Parachute. Absorbs impact on landing Converts kinetic energy to heat Increases air resistance to slow descent Decreases air resistance to speed descent None Hint 36. 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 / √(2meV) Wavelength λ = h / eV Wavelength λ = h / mv Wavelength λ = h / p None Hint 37. 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: remains constant becomes zero decreases increases None Hint 38. 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 √3 mg/√3 1/√3 None Hint 39. 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 0 E/4 E/2 None Hint 40. State Pascal's law. Name any one device based on this law. Pressure applied to a confined fluid is transmitted undiminished in all directions Total energy in a system remains constant Energy cannot be created or destroyed The pressure of a gas is inversely proportional to its volume None Hint 41. Work done in displacing a charge q on an equipotential surface through a distance r will be: q / 4πε₀r² q / 4πε₀r 4πε₀rq Zero None Hint 42. The phenomenon responsible for the formation of rainbow is: interference dispersion diffraction polarization None Hint 43. 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 false Both (1) and (2) are true (1) is true, (2) is false (1) is false, (2) is true None Hint 44. A force of 5 N is applied on a body of mass 2 kg. The acceleration of the body will be: 0.4 ms⁻² 0.0 ms⁻² 2.5 ms⁻² 10.0 ms⁻² None Hint 45. Complete the following two sentences using the words given in the bracket (4.18, 4180, increases, decreases): 1 k Calorie = _____________joules 4.18 joules 4180 joules 418 joules 41.8 joules None Hint 46. Distinguish between: (i) Pitch and frequency (ii) Loudness and intensity Pitch and intensity both relate to loudness Pitch and loudness both relate to frequency Pitch relates to intensity; Loudness relates to frequency Pitch relates to frequency; Loudness relates to intensity None Hint 47. Give the names of the four factors on which the resistance of a conductor depends. Length, color, shape, and material Length, cross-sectional area, temperature, and material Volume, length, material, and color Weight, temperature, length, and color None Hint 48. 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 25 cm 75 cm 15 cm 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: 50000 N 500 N 5000 N 50 N None Hint 50. Fill in the blanks: In a nuclear reactor, moderator is used to _____________ the triggering neutrons. speed up slow down absorb reflect 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
