A set of Physics CEE-4

Posted by Nepal Quiz

الجمعة، 27 ديسمبر 2024

_Physics

 A set of Physics CEE-4

1. The escape velocity for an object at the surface of the Earth is:

a) $\sqrt{2gR}$
b) $\sqrt{gR}$
c) $\frac{g}{2R}$
d) $\sqrt{gR}$

2. The refractive index of a material is defined as the ratio of:

a) Speed of light in vacuum to the speed of light in the material
b) Wavelength of light in the material to the wavelength in vacuum
c) Frequency of light in the material to the frequency in vacuum
d) Speed of light in the material to the speed of light in vacuum

3. A concave mirror has a focal length of 15 cm. An object is placed at 30 cm from the mirror. The image formed is:

a) Virtual and erect
b) Virtual and inverted
c) Real and inverted
d) Real and erect

4. The force on a charged particle moving with velocity $v$ perpendicular to a magnetic field $B$ is given by:

a) $F = Bv$
b) $F = qvB$
c) $F = \frac{q}{v} B$
d) $F = \frac{v}{q} B$

5. If the resistance of a conductor is 4 Ω, the current passing through it is 2 A. What is the potential difference across the conductor?

a) 2 V
b) 4 V
c) 8 V
d) 6 V

6. In an ideal gas, the product of pressure and volume is proportional to:

a) Temperature
b) Number of moles
c) Both a and b
d) None of the above

7. A satellite moves in a circular orbit at a height $h$ above the Earth's surface. The time period of the satellite depends on:

a) The mass of the satellite
b) The radius of the orbit
c) Both the mass of the satellite and the radius of the orbit
d) Only the mass of the Earth

8. The phenomenon of diffraction of light occurs due to:

a) Reflection
b) Refraction
c) Interference
d) The wave nature of light

9. The force of gravitational attraction between two objects is inversely proportional to:

a) The square of the distance between them
b) The distance between them
c) The square of their masses
d) The cube of the distance between them

10. A body of mass 2 kg is moving with a velocity of 3 m/s. The kinetic energy of the body is:

a) 3 J
b) 4 J
c) 6 J
d) 9 J

11. The intensity of sound is measured in:

a) Decibels
b) Hertz
c) Amperes
d) Joules

12. A proton and an electron are placed in the same electric field. The force on the proton is:

a) Equal to the force on the electron
b) Greater than the force on the electron
c) Less than the force on the electron
d) Zero

13. The SI unit of electric potential is:

a) Volt
b) Ampere
c) Coulomb
d) Watt

14. In the photoelectric effect, the energy of emitted electrons depends on:

a) The intensity of light
b) The frequency of light
c) The amplitude of light
d) The brightness of light

15. The critical angle for a light ray traveling from glass (n = 1.5) to air (n = 1) is:

a) 41.8°
b) 42.5°
c) 48.6°
d) 60°

16. The magnetic field at the center of a solenoid depends on:

a) The number of turns per unit length
b) The current flowing through the solenoid
c) Both a and b
d) The length of the solenoid

17. In a Young's double-slit experiment, the fringe width increases if:

a) The distance between the slits is increased
b) The wavelength of light is decreased
c) The screen is moved closer to the slits
d) The distance between the slits is decreased

18. The energy of a photon is directly proportional to its:

a) Frequency
b) Wavelength
c) Amplitude
d) Speed

19. A simple pendulum oscillates with a period $T$. If the length of the pendulum is halved, its period becomes:

a) $T/2$
b) $T/\sqrt{2}$
c) $\sqrt{2}T$
d) $T/4$

20. Which of the following is the unit of capacitance?

a) Volt
b) Ampere
c) Ohm
d) Farad

21. The force of attraction between two charges is $F$. If the distance between them is doubled, the force becomes:

a) $F/2$
b) $F/4$
c) $F/8$
d) $F/16$

22. A metallic conductor carries a current. The free electrons in the conductor:

a) Move at constant speed
b) Move randomly
c) Move with an accelerating speed
d) Do not move

23. The force between two parallel current-carrying conductors is directly proportional to:

a) The square of the current
b) The distance between them
c) The product of the currents
d) The resistivity of the material

24. The work done by a force on an object is equal to:

a) The change in the object's momentum
b) The rate of change of its kinetic energy
c) The product of the force and the displacement in the direction of the force
d) The product of the force and time

25. Which of the following is true about a convex lens?

a) It always forms a real image
b) It always forms a virtual image
c) It can form both real and virtual images
d) It never forms an image

26. The time period of a simple pendulum is independent of:

a) Mass of the bob
b) Length of the pendulum
c) Acceleration due to gravity
d) None of the above

27. A transformer works on the principle of:

a) Self-induction
b) Mutual induction
c) Electromagnetic induction
d) Faraday's law of induction

28. The intensity of a sound wave is proportional to the square of its:

a) Amplitude
b) Wavelength
c) Frequency
d) Velocity

29. The SI unit of magnetic flux is:

a) Tesla
b) Weber
c) Ampere
d) Gauss

30. The rate of change of magnetic flux through a coil induces:

a) An electric current
b) A magnetic field
c) A potential difference
d) A force on the coil

31. A body of mass 5 kg is moving with a velocity of 4 m/s. The momentum of the body is:

a) 9 kg·m/s
b) 15 kg·m/s
c) 20 kg·m/s
d) 25 kg·m/s

32. The frequency of a wave is 10 Hz. The time period of the wave is:

a) 0.1 s
b) 1 s
c) 10 s
d) 100 s

33. The electric field produced by a uniformly charged infinite plane sheet of charge is:

a) Zero
b) Proportional to the distance from the sheet
c) Constant
d) Inversely proportional to the distance from the sheet

34. The work function of a metal is the minimum energy required to:

a) Remove an electron from the metal
b) Break the metal into pieces
c) Raise the temperature of the metal
d) Cause the metal to vibrate

35. The energy stored in a capacitor is given by:

a) $E = \frac{1}{2} C V^2$
b) $E = \frac{1}{2} QV$
c) $E = C \times V$
d) ( E = \frac{1}{2} Q^2 \

)

36. Which of the following materials has the highest resistivity?

a) Copper
b) Aluminum
c) Silver
d) Rubber

37. The power dissipated in a resistor is proportional to:

a) $R$
b) $V^2$
c) $I^2$
d) $I \times V$

38. The frequency of a wave is related to the wavelength and speed of the wave by the equation:

a) $f = \lambda v$
b) $f = \frac{v}{\lambda}$
c) $f = v \lambda$
d) $f = \frac{1}{\lambda v}$

39. The electric potential energy of a system of two charges is:

a) Positive if the charges are like
b) Negative if the charges are unlike
c) Negative if the charges are like
d) Zero if the charges are like

40. A charged particle moves in a uniform magnetic field. The radius of the circular path is directly proportional to:

a) The velocity of the particle
b) The magnetic field strength
c) The mass of the particle
d) Both a and c

41. The average speed of a body is defined as the:

a) Total distance traveled divided by total time
b) Displacement divided by total time
c) Distance traveled in one second
d) Rate of change of displacement

42. The wavelength of the de Broglie wave associated with a particle is inversely proportional to its:

a) Mass
b) Velocity
c) Momentum
d) Kinetic energy

43. The equivalent resistance of two resistors connected in series is:

a) The sum of the resistances
b) The product of the resistances
c) The difference of the resistances
d) The harmonic mean of the resistances

44. The work done in stretching a spring is given by:

a) $W = \frac{1}{2} k x^2$
b) $W = k x^2$
c) $W = k x$
d) $W = \frac{1}{2} x^2$

45. Which of the following is a characteristic property of a magnetic field?

a) It is always present around a moving electric charge
b) It is always directed from north to south
c) It can only exist around permanent magnets
d) It only affects metallic objects

46. The total energy of an electron in the second orbit of a hydrogen atom is:

a) $-13.6 \, \text{eV}$
b) $-3.4 \, \text{eV}$
c) $-1.6 \, \text{eV}$
d) $3.4 \, \text{eV}$

47. The efficiency of a machine is the ratio of:

a) Output work to input work
b) Output energy to input energy
c) Output power to input power
d) All of the above

48. The motion of a simple pendulum is:

a) Periodic
b) Uniform
c) Non-periodic
d) Linear

49. Which of the following is true for a concave lens?

a) It always forms a real image
b) It always forms a virtual image
c) It forms both real and virtual images
d) It never forms an image

50. The magnetic field inside a long solenoid is:

a) Zero
b) Constant and uniform
c) Inversely proportional to the current
d) Inversely proportional to the length of the solenoid

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Answer Key:

1. a) $\sqrt{2gR}$
2. a) Speed of light in vacuum to the speed of light in the material
3. c) Real and inverted
4. b) $F = qvB$
5. c) 8 V
6. a) Temperature
7. b) The radius of the orbit
8. d) The wave nature of light
9. a) The square of the distance between them
10. c) 6 J
11. a) Decibels
12. b) Greater than the force on the electron
13. a) Volt
14. b) The frequency of light
15. a) 41.8°
16. c) Both a and b
17. c) The screen is moved closer to the slits
18. a) Frequency
19. b) $T/\sqrt{2}$
20. d) Farad
21. b) $F/4$
22. b) Move randomly
23. c) The product of the currents
24. c) The product of the force and the displacement in the direction of the force
25. c) It can form both real and virtual images
26. a) Mass of the bob
27. b) Mutual induction
28. a) $R$
29. b) Weber
30. a) An electric current
31. b) 15 kg·m/s
32. a) 0.1 s
33. c) Constant
34. a) Remove an electron from the metal
35. a) $E = \frac{1}{2} C V^2$
36. d) Rubber
37. c) $I^2$
38. b) $f = \frac{v}{\lambda}$
39. a) Positive if the charges are like
40. d) Both a and c
41. a) Total distance traveled divided by total time
42. c) Momentum
43. a) The sum of the resistances
44. a) $W = \frac{1}{2} k x^2$
45. a) It is always present around a moving electric charge
46. b) $-3.4 \, \text{eV}$
47. d) All of the above
48. a) Periodic
49. b) It always forms a virtual image
50. b) Constant and uniform