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. 0.625 N/m² 1.25 N/m² 0.25 N/m² 0.5 N/m² None Hint 2. Interference is a phenomenon exhibited by: particles only waves as well as particles waves only neither the waves nor the particles None Hint 3. Fill in the blanks: A photodiode is always connected in _____________ biasing. reverse high forward zero None Hint 4. 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 5. Give any two differences between the way the electric field and the magnetic field deflect a moving charged particle. Electric field deflects irrespective of velocity; magnetic field deflects only if velocity is present Magnetic field deflects only neutral particles Electric field does not deflect charged particles Both deflect particles regardless of velocity None Hint 6. Give in brief the principle of working of Parachute. Parachute decreases air resistance, increasing speed Parachute absorbs energy of fall Parachute increases air resistance, reducing speed of fall Parachute changes direction of motion None Hint 7. Through wave motion: energy and particles both are transmitted neither energy nor particles are transmitted only energy is transmitted only particles are transmitted None Hint 8. Distinguish between: (i) Pitch and frequency (ii) Loudness and intensity Pitch relates to intensity; Loudness relates to frequency Pitch and loudness both relate to frequency Pitch relates to frequency; Loudness relates to intensity Pitch and intensity both relate to loudness None Hint 9. 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: 75 cm 15 cm 25 cm 60 cm None Hint 10. Give in brief the principle of working of Parachute. Decreases air resistance to speed descent Converts kinetic energy to heat Increases air resistance to slow descent Absorbs impact on landing None Hint 11. 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 1/√3 mg/√3 None Hint 12. Are the various devices in a household circuit connected in series or in parallel? Why? Neither Both Series Parallel None Hint 13. 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: 500 N 50 N 5000 N 50000 N None Hint 14. Calculate the excess pressure inside a soap bubble of radius 4 cm. The surface tension of soap solution is 25 × 10⁻³ Nm⁻¹: 5 × 10⁻³ N/m² 1.25 × 10⁻¹ N/m² 6.25 × 10⁻³ N/m² 3.125 × 10⁻² N/m² None Hint 15. The number of electrons that constitute -1 C of charge is: 6.25 x 10¹⁸ 9.0 x 10¹⁸ 1.6 x 10¹⁹ 6.4 x 10²⁷ None Hint 16. What is meant by photoelectric emission? What does it indicate – particle nature of wave or wave nature of particle? Emission of photons from a metal surface; wave nature Absorption of electrons; wave nature Reflection of light from a surface; particle nature Emission of electrons from metal surface when light shines; particle nature None Hint 17. Fill in the blanks: A forward biased p-n junction offers _________ resistance to the flow of electrons. high low zero moderate None Hint 18. Use of a transistor Receiver for remote Rectifier Oscillator Stabilizer None Hint 19. Apparent breach of the law of conservation of energy in beta-decay reactions led to the discovery of: Proton Neutrino Neutron Electron None Hint 20. Give any two differences between the way the electric field and the magnetic field deflect a moving charged particle: Electric field does not affect charged particles; magnetic field does Electric field exerts force on stationary charges; magnetic field exerts force only on moving charges Electric field only attracts; magnetic field only repels Both deflect particles in the same way None Hint 21. 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 increases becomes zero decreases None Hint 22. Work done in displacing a charge q on an equipotential surface through a distance r will be: 4πε₀rq Zero q / 4πε₀r q / 4πε₀r² None Hint 23. Complete the following two sentences using the words given in the bracket (4.18, 4180, increases, decreases): 1 k Calorie = _____________joules 4.18 joules 418 joules 41.8 joules 4180 joules None Hint 24. Give the names of the four factors on which the resistance of a conductor depends: Length, density, color, shape Thickness, color, material, temperature Length, weight, material, color Length, cross-sectional area, material, temperature None Hint 25. 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 26. Minimum number of non-coplanar forces acting on a body to keep it in equilibrium will be: 3 5 4 2 None Hint 27. 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 4 10 8 None Hint 28. Distinguish between: (i) Pitch and frequency (ii) Loudness and intensity Pitch and frequency are same; Loudness and intensity are same 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 None Hint 29. The law of conservation of energy is applicable to: Every system of the universe Nuclear systems only Chemical systems only Mechanical systems only None Hint 30. 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 0 E None Hint 31. State Stoke's law. Mention any two of its applications. 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 Stoke's law explains sound waves; used in acoustics and sonar Stoke's law relates to magnetic fields; used in electromagnetics and motors None Hint 32. Write any three distinguishing features of the fringe patterns formed in Young’s double slit experiment and single slit diffraction. 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 All of the above None Hint 33. 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 / p Wavelength λ = h / eV Wavelength λ = h / √(2meV) Wavelength λ = h / mv None Hint 34. 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 5000 N 500 N None Hint 35. What is meant by: (i) an isothermal process (ii) an adiabatic process (i) Constant temperature process (ii) No heat exchange process (i) Constant volume process (ii) Constant pressure process (i) No heat exchange process (ii) Constant temperature process (i) Constant pressure process (ii) Constant volume process None Hint 36. Use of a p-n junction diode Receiver for remote Rectifier Stabilizer Oscillator None Hint 37. The maximum number of electrons present in the outermost orbit of any atom is: infinite 32 8 2 None Hint 38. State: (i) Zeroth law of thermodynamics (ii) First law of thermodynamics Energy is created; Energy is destroyed Pressure and volume relation; Temperature and entropy relation Thermal equilibrium concept; Conservation of energy Heat cannot flow; Heat can flow freely None Hint 39. 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 40. 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 Both (1) and (2) are true Both (1) and (2) are false (1) is false, (2) is true None Hint 41. Fill in the blanks: In a nuclear reactor, moderator is used to _____________ the triggering neutrons. reflect slow down absorb speed up None Hint 42. 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 0.0 ms⁻² 0.4 ms⁻² None Hint 43. 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 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? Green Red Yellow Blue None Hint 45. State Pascal's law. Name any one device based on this law. Total energy in a system remains constant The pressure of a gas is inversely proportional to its volume Energy cannot be created or destroyed Pressure applied to a confined fluid is transmitted undiminished in all directions None Hint 46. Half-life of a radioactive element is 2 years. What fraction of its mass will be left after 8 years? 1/16 1/8 1/256 1/2 None Hint 47. The phenomenon responsible for the formation of rainbow is: dispersion diffraction polarization interference None Hint 48. A 110 W electric bulb is connected to a 220 V dc supply. The resistance of the bulb is: 2 Ω 110 Ω 220 Ω 440 Ω None Hint 49. 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 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 down Body moves up 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
