A Set Physics CEE-6

Posted by Nepal Quiz

Friday, 27 December 2024

_Physics

A Set Physics CEE-6

1. The wavelength of the light emitted by a hydrogen atom when the electron transitions from the $n = 2$ to $n = 1$ energy level is in the:

a) Ultraviolet region
b) Visible region
c) Infrared region
d) X-ray region

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

a) Mass of the bob
b) Length of the pendulum
c) Amplitude of oscillation
d) Acceleration due to gravity

3. If the frequency of a wave is doubled, its wavelength will:

a) Be doubled
b) Remain the same
c) Be halved
d) Be quadrupled

4. The electric field intensity at a point due to a point charge is:

a) Proportional to $\frac{1}{r^2}$
b) Proportional to $\frac{1}{r}$
c) Independent of distance
d) Proportional to $r^2$

5. The force between two charges is given by Coulomb’s law. If the distance between the charges is doubled, the force between them will:

a) Double
b) Remain the same
c) Be halved
d) Be quartered

6. A body is thrown vertically upwards. Its velocity at the highest point is:

a) Zero
b) Maximum
c) Minimum
d) Equal to the initial velocity

7. The acceleration due to gravity on the Moon is approximately:

a) 1.6 m/s²
b) 9.8 m/s²
c) 16 m/s²
d) 0.16 m/s²

8. The total mechanical energy of a system remains constant if:

a) Only conservative forces act on the system
b) Non-conservative forces act on the system
c) External forces are absent
d) The system is in equilibrium

9. A 20 Ω resistor is connected to a 10 V battery. The power dissipated by the resistor is:

a) 0.5 W
b) 2 W
c) 5 W
d) 10 W

10. The velocity of light in a medium with refractive index $n$ is:

a) $\frac{c}{n}$
b) $c n$
c) $c$
d) $\frac{n}{c}$

11. The energy required to move a charge $q$ through a potential difference $V$ is:

a) $Vq$
b) $\frac{q}{V}$
c) $\frac{V}{q}$
d) $qV^2$

12. A capacitor is charged by a DC source. After a long time, the current through the capacitor is:

a) Maximum
b) Zero
c) Decreasing
d) Constant

13. Which of the following is true for a concave mirror?

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

14. The rate of change of magnetic flux through a coil is called:

a) Induced current
b) Magnetic induction
c) Electric field
d) Electromagnetic induction

15. The escape velocity from the Earth’s surface is approximately:

a) 3.2 km/s
b) 7.2 km/s
c) 11.2 km/s
d) 15 km/s

16. The force acting on a charged particle moving in a magnetic field is proportional to:

a) The velocity of the particle
b) The magnetic field strength
c) The charge on the particle
d) All of the above

17. The kinetic energy of a moving object is:

a) Inversely proportional to the velocity
b) Proportional to the square of the velocity
c) Proportional to the velocity
d) Independent of velocity

18. The work done in moving a charge $q$ through a potential difference $V$ is:

a) $W = V \times q$
b) $W = \frac{V}{q}$
c) $W = q \times V^2$
d) $W = \frac{q}{V}$

19. Which of the following is true for a convex 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

20. The magnetic field lines inside a solenoid are:

a) Circular
b) Parallel and equidistant
c) Radial
d) Perpendicular to the axis of the solenoid

21. The intensity of sound is measured in:

a) Watts per meter
b) Decibels
c) Hertz
d) Joules

22. The moment of inertia of a solid sphere of radius $R$ and mass $M$ about an axis passing through its center is:

a) $\frac{1}{2}MR^2$
b) $\frac{2}{5}MR^2$
c) $\frac{3}{4}MR^2$
d) $MR^2$

23. The unit of electric charge is:

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

24. The work done by a variable force is given by:

a) $W = F \times d$
b) $W = \int F(x) dx$
c) $W = \frac{1}{2} F d$
d) $W = \frac{1}{2} F \times d^2$

25. A particle moves with uniform circular motion. The acceleration of the particle is:

a) In the direction of velocity
b) Radial and towards the center
c) Zero
d) Along the tangential direction

26. The relation between the frequency and time period of a wave is:

a) $f = T^2$
b) $f = \frac{1}{T}$
c) $f = T$
d) $f = 2T$

27. The resistance of a wire is inversely proportional to its:

a) Length
b) Cross-sectional area
c) Temperature
d) Voltage

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

a) Intensity of light
b) Frequency of light
c) Wavelength of light
d) Speed of light

29. The efficiency of an engine is defined as the ratio of:

a) Work done to heat supplied
b) Heat supplied to work done
c) Energy output to energy input
d) Energy input to energy output

30. The power of a lens is the reciprocal of:

a) Focal length
b) Image distance
c) Object distance
d) Refraction index

31. The force of attraction between two masses is directly proportional to:

a) Their relative velocity
b) The square of the distance between them
c) The product of their masses
d) The square of their masses

32. The speed of sound in air depends on:

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

33. The angular momentum of an object moving in a circle is:

a) Constant
b) Changing uniformly
c) Varying with time
d) Zero

34. In a transverse wave, the direction of vibration of the particles is:

a) Parallel to the direction of propagation
b) Perpendicular to the direction of propagation
c) Random
d) None of the above

35. The energy stored in a stretched spring is given by:

a) $E = kx$
b) $E = \frac{1}{2} kx^2$
c) $E = kx^3$
d) $E = kx^4$

36. The electric field due to a uniformly charged spherical shell at any point inside the shell is:

a) Zero
b) Constant
c) Directly proportional to the distance from the center
d) Inversely proportional to the distance from the center

37. The force on a charged particle moving through

a magnetic field depends on: a) The charge
b) The velocity of the particle
c) The strength of the magnetic field
d) All of the above

38. The focal length of a concave lens is:

a) Positive
b) Negative
c) Zero
d) Infinity

39. The power dissipated in a resistor is directly proportional to:

a) The square of the current
b) The resistance
c) The square of the voltage
d) The current

40. The value of Planck's constant $h$ is:

a) $6.63 \times 10^{-34} \, \text{J·s}$
b) $6.63 \times 10^{-34} \, \text{N·m}$
c) $3 \times 10^8 \, \text{m/s}$
d) $1.6 \times 10^{-19} \, \text{C}$

41. The potential difference across a resistor is 12 V and the current is 3 A. The power dissipated in the resistor is:

a) 4 W
b) 36 W
c) 48 W
d) 24 W

42. The magnetic field due to a long straight current-carrying wire at a point is:

a) Directly proportional to the current
b) Inversely proportional to the distance from the wire
c) Directly proportional to the distance from the wire
d) Both a and b

43. The total mechanical energy of a system is constant if the forces acting on the system are:

a) Conservative
b) Non-conservative
c) Zero
d) Unbalanced

44. The refractive index of a medium is:

a) The ratio of speed of light in vacuum to that in the medium
b) The ratio of the refractive index of the medium to that of air
c) The ratio of wavelength in the medium to that in air
d) None of the above

45. The potential energy of an object is maximum at:

a) The highest point in its motion
b) The point of equilibrium
c) The lowest point in its motion
d) Any point

46. The unit of electrical potential is:

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

47. The displacement of a body moving with uniform acceleration is given by:

a) $s = ut + \frac{1}{2} at^2$
b) $s = ut - \frac{1}{2} at^2$
c) $s = v + at$
d) $s = v - at$

48. The temperature at which the Kelvin and Celsius scales are equal is:

a) -273°C
b) -40°C
c) 0°C
d) 100°C

49. The unit of magnetic field strength is:

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

50. The work-energy theorem states that the work done on an object is equal to the:

a) Change in its momentum
b) Product of force and displacement
c) Change in its velocity
d) Change in its kinetic energy

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Answer Key:

1. a) Ultraviolet region
2. a) Mass of the bob
3. c) Be halved
4. a) Proportional to $\frac{1}{r^2}$
5. d) Be quartered
6. a) Zero
7. a) 1.6 m/s²
8. a) Only conservative forces act on the system
9. b) 2 W
10. a) $\frac{c}{n}$
11. a) $Vq$
12. b) Zero
13. c) It can form both real and virtual images
14. d) Electromagnetic induction
15. c) 11.2 km/s
16. d) All of the above
17. b) Proportional to the square of the velocity
18. a) $W = V \times q$
19. c) It forms both real and virtual images
20. b) Parallel and equidistant
21. b) Decibels
22. b) $\frac{2}{5}MR^2$
23. b) Coulomb
24. b) $W = \int F(x) dx$
25. b) Radial and towards the center
26. b) $f = \frac{1}{T}$
27. b) Cross-sectional area
28. b) Frequency of light
29. c) Energy output to energy input
30. a) Focal length
31. c) The product of their masses
32. c) Temperature
33. a) Constant
34. b) Perpendicular to the direction of propagation
35. b) $E = \frac{1}{2} kx^2$
36. a) Zero
37. d) All of the above
38. b) Negative
39. a) The square of the current
40. a) $6.63 \times 10^{-34} \, \text{J·s}$
41. c) 48 W
42. d) Both a and b
43. a) Conservative
44. a) The ratio of speed of light in vacuum to that in the medium
45. a) The highest point in its motion
46. c) Volt
47. a) $s = ut + \frac{1}{2} at^2$
48. b) -40°C
49. b) Tesla
50. d) Change in its kinetic energy