Physics Nios Plus Two PQ III Welcome to your Physics Nios Plus Two PQ III Total Questions: 50 Name Mobile No: 1. 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 2. 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 3. Fill in the blanks: A photodiode is always connected in _____________ biasing. high forward zero reverse None Hint 4. 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: 15 cm 25 cm 75 cm 60 cm None Hint 5. 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: decreases becomes zero remains constant increases None Hint 6. Distinguish between: (i) Pitch and frequency (ii) Loudness and intensity Pitch and frequency are same; Loudness and intensity are same Frequency depends on pitch; Intensity depends on loudness Pitch depends on amplitude; Loudness depends on wavelength Pitch depends on frequency, frequency is physical; Loudness is psychological, intensity is physical None Hint 7. Interference is a phenomenon exhibited by: particles only neither the waves nor the particles waves only waves as well as particles None Hint 8. A force of 5 N is applied on a body of mass 2 kg. The acceleration of the body will be: 0.0 ms⁻² 2.5 ms⁻² 0.4 ms⁻² 10.0 ms⁻² None Hint 9. 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 electrons from metal surface when light shines; particle nature Absorption of electrons; wave nature Emission of photons from a metal surface; wave nature 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. 2 10 8 4 None Hint 11. Calculate the excess pressure inside a soap bubble of radius 4 cm. The surface tension of soap solution is 25 × 10⁻³ Nm⁻¹: 6.25 × 10⁻³ N/m² 1.25 × 10⁻¹ N/m² 3.125 × 10⁻² N/m² 5 × 10⁻³ N/m² None Hint 12. Give the names of the four factors on which the resistance of a conductor depends: Thickness, color, material, temperature Length, weight, material, color Length, density, color, shape Length, cross-sectional area, material, temperature None Hint 13. 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 14. 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 10⁻³ J 0.5 x 10³ J 10³ J None Hint 15. A 110 W electric bulb is connected to a 220 V dc supply. The resistance of the bulb is: 440 Ω 2 Ω 220 Ω 110 Ω None Hint 16. Give in brief the principle of working of Parachute. Converts kinetic energy to heat Increases air resistance to slow descent Decreases air resistance to speed descent Absorbs impact on landing None Hint 17. 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 1:1 3:1 9:1 None Hint 18. 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: mg/√3 √3 1/√3 √3 mg None Hint 19. State Pascal's law. Name any one device based on this law. The pressure of a gas is inversely proportional to its volume 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 None Hint 20. 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 50000 N 50 N 5000 N None Hint 21. 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 All of the above Double slit: fringes are wider; Single slit: fringes are narrower Double slit: bright and dark fringes; Single slit: diffraction pattern None Hint 22. State: (i) Zeroth law of thermodynamics (ii) First law of thermodynamics Thermal equilibrium concept; Conservation of energy Heat cannot flow; Heat can flow freely Pressure and volume relation; Temperature and entropy relation Energy is created; Energy is destroyed None Hint 23. 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 24. 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 false, (2) is true (1) is true, (2) is false Both (1) and (2) are false Both (1) and (2) are true None Hint 25. 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 relates to magnetic fields; used in electromagnetics and motors Stoke's law explains heat conduction; used in thermodynamics and engines Stoke's law explains sound waves; used in acoustics and sonar None Hint 26. 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 Body moves down Body moves up Position remains same None Hint 27. The number of electrons that constitute -1 C of charge is: 1.6 x 10¹⁹ 9.0 x 10¹⁸ 6.4 x 10²⁷ 6.25 x 10¹⁸ None Hint 28. The law of conservation of energy is applicable to: Nuclear systems only Every system of the universe Chemical systems only Mechanical systems only None Hint 29. 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 30. Complete the following two sentences using the words given in the bracket (4.18, 4180, increases, decreases): 1 k Calorie = _____________joules 4180 joules 41.8 joules 4.18 joules 418 joules None Hint 31. Give in brief the principle of working of Parachute. Parachute increases air resistance, reducing speed of fall Parachute changes direction of motion Parachute absorbs energy of fall Parachute decreases air resistance, increasing speed None Hint 32. 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 33. 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 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 None Hint 34. In which of the following situations work is done against gravity of earth? A person tries to lift a heavy load but fails to do so A monkey climbs up a tree A person lifts a load to a certain height in an earth’s natural satellite A car moves on a horizontal level road None Hint 35. 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 0 E/4 None Hint 36. Fill in the blanks: In a nuclear reactor, moderator is used to _____________ the triggering neutrons. absorb speed up slow down reflect None Hint 37. A parallel beam of white light is incident on a convex lens. Which of the following colours will converge nearest to its optical focus? Yellow Green Red Blue None Hint 38. The maximum number of electrons present in the outermost orbit of any atom is: 2 infinite 32 8 None Hint 39. Use of a p-n junction diode Receiver for remote Stabilizer Oscillator Rectifier None Hint 40. Are the various devices in a household circuit connected in series or in parallel? Why? Both Series Parallel Neither None Hint 41. Fill in the blanks: A forward biased p-n junction offers _________ resistance to the flow of electrons. high moderate low zero None Hint 42. 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 43. The phenomenon responsible for the formation of rainbow is: interference polarization dispersion diffraction None Hint 44. 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: K²:1 1:K K:1 1:1 None Hint 45. Minimum number of non-coplanar forces acting on a body to keep it in equilibrium will be: 3 4 2 5 None Hint 46. Use of a transistor Oscillator Stabilizer Receiver for remote Rectifier None Hint 47. 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 50 N 50000 N None Hint 48. 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 49. Work done in displacing a charge q on an equipotential surface through a distance r will be: q / 4πε₀r² 4πε₀rq Zero q / 4πε₀r None Hint 50. Apparent breach of the law of conservation of energy in beta-decay reactions led to the discovery of: Neutrino Neutron Electron Proton 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
