A set of Physics CEE-5

Posted by Nepal Quiz

Friday, 27 December 2024

_Physics

A set of Physics CEE-5

1. The potential energy of a body of mass $m$ raised to a height $h$ is:

a) $mgh$
b) $\frac{1}{2}mgh$
c) $mgh^2$
d) $\frac{1}{2}mh^2$

2. The magnetic force on a current-carrying wire of length $l$, in a magnetic field $B$, is given by:

a) $F = lB$
b) $F = I l B$
c) $F = I B^2 l$
d) $F = B^2 I l$

3. The current through a conductor is directly proportional to the potential difference across it. This is a statement of:

a) Coulomb’s law
b) Ohm’s law
c) Kirchhoff’s law
d) Ampere’s law

4. Which of the following types of wave can travel through a vacuum?

a) Sound waves
b) Water waves
c) Electromagnetic waves
d) None of the above

5. The refractive index of a material is 1.5. If the speed of light in air is $3 \times 10^8 \, \text{m/s}$, the speed of light in the material is:

a) $2 \times 10^8 \, \text{m/s}$
b) $3 \times 10^8 \, \text{m/s}$
c) $1.5 \times 10^8 \, \text{m/s}$
d) $2.5 \times 10^8 \, \text{m/s}$

6. The work done in stretching a spring by an amount $x$ is given by:

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

7. The relationship between the wavelength $\lambda$, frequency $f$, and speed of light $c$ is:

a) $c = f \lambda$
b) $c = \frac{f}{\lambda}$
c) $c = f \times \lambda^2$
d) $c = \frac{\lambda}{f}$

8. A body of mass 2 kg is moving with a velocity of 3 m/s. The momentum of the body is:

a) 5 kg·m/s
b) 6 kg·m/s
c) 3 kg·m/s
d) 10 kg·m/s

9. The period of a simple pendulum is given by $T = 2\pi \sqrt{\frac{L}{g}}$. What happens to the period if the length of the pendulum is doubled?

a) It doubles
b) It becomes $\sqrt{2}$ times longer
c) It becomes $2\sqrt{2}$ times longer
d) It remains unchanged

10. The energy stored in a capacitor is given by the expression:

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

11. The electric field inside a conductor in electrostatic equilibrium is:

a) Zero
b) Non-zero
c) Constant
d) Varies with the charge distribution

12. 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) 0.01 s

13. The magnetic force acting on a moving charged particle is maximum when:

a) The angle between velocity and magnetic field is $0^\circ$
b) The angle between velocity and magnetic field is $90^\circ$
c) The velocity and magnetic field are parallel
d) The velocity and magnetic field are antiparallel

14. The total mechanical energy of a system is conserved in the presence of:

a) Conservative forces
b) Non-conservative forces
c) Both conservative and non-conservative forces
d) None of the above

15. The refractive index of glass is 1.5. If the angle of incidence is 30°, what is the angle of refraction when the light passes into water (n = 1.33)?

a) 20.9°
b) 19.5°
c) 22.4°
d) 25.8°

16. The capacitance of a parallel plate capacitor is given by $C = \epsilon_0 \frac{A}{d}$. If the area of the plates is doubled, what will happen to the capacitance?

a) It will be halved
b) It will be doubled
c) It will remain the same
d) It will be quadrupled

17. Which of the following will result in a decrease in the resistance of a conductor?

a) Increasing its length
b) Decreasing its cross-sectional area
c) Increasing the temperature
d) Increasing the cross-sectional area

18. The pressure in a fluid is given by $P = \rho g h$, where $h$ is the height of the fluid. This is a statement of:

a) Pascal’s law
b) Archimedes’ principle
c) Bernoulli’s equation
d) Hydrostatic pressure formula

19. 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

20. The resistance of a conductor is directly proportional to:

a) The temperature
b) The cross-sectional area
c) The material
d) The length

21. The total energy of an electron in the $n$-th orbit of a hydrogen atom is given by $E_n = -\frac{13.6}{n^2}$ eV. What is the energy of the electron in the second orbit?

a) -13.6 eV
b) -6.8 eV
c) -3.4 eV
d) -1.7 eV

22. Which of the following is the SI unit of magnetic flux?

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

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

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

24. The motion of a particle in a uniform circular motion is:

a) Uniform acceleration
b) Non-uniform acceleration
c) Uniform velocity
d) Uniform speed

25. The gravitational potential energy of an object of mass $m$ at a height $h$ above the Earth’s surface is:

a) $mgh$
b) $\frac{mgh}{2}$
c) $mgh^2$
d) $\frac{1}{2}mgh^2$

26. The law that states the angle of incidence is equal to the angle of reflection is known as:

a) Snell’s law
b) Fermat’s principle
c) Reflection law
d) Newton’s law of reflection

27. A transformer works on the principle of:

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

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

a) The amplitude
b) The mass of the bob
c) The length of the pendulum
d) The acceleration due to gravity

29. The energy stored in a spring is given by:

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

30. The gravitational field at the surface of the Earth is:

a) Constant
b) Varies with the height

c) Zero
d) Inversely proportional to the distance

31. The resistance of a wire is $R = \rho \frac{L}{A}$. If the length of the wire is doubled, what will happen to the resistance?

a) It will remain the same
b) It will double
c) It will quadruple
d) It will halve

32. The energy of an electron in the first orbit of a hydrogen atom is:

a) -13.6 eV
b) -6.8 eV
c) -1.6 eV
d) 3.4 eV

33. A body of mass 4 kg is moving with a velocity of 6 m/s. The kinetic energy of the body is:

a) 12 J
b) 24 J
c) 36 J
d) 48 J

34. The rate of change of momentum of a body is:

a) Force
b) Acceleration
c) Energy
d) Power

35. A charged particle is moving in a magnetic field. The direction of the force on the particle is given by:

a) Fleming’s left-hand rule
b) Fleming’s right-hand rule
c) Right-hand thumb rule
d) None of the above

36. The capacitance of a parallel plate capacitor depends on:

a) The area of the plates
b) The distance between the plates
c) The dielectric constant of the material between the plates
d) All of the above

37. The resistance of a metallic conductor increases with:

a) Decrease in temperature
b) Increase in temperature
c) Increase in cross-sectional area
d) Decrease in length

38. The angular velocity of an object in uniform circular motion is:

a) Zero
b) Constant
c) Varies with time
d) Proportional to the speed

39. The electric field produced by a positive charge is:

a) Radially inward
b) Radially outward
c) Circular
d) None of the above

40. The SI unit of energy is:

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

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

a) 11.2 km/s
b) 15 km/s
c) 20 km/s
d) 25 km/s

42. A capacitor stores energy in the form of:

a) Electric field
b) Magnetic field
c) Gravitational potential
d) Kinetic energy

43. The time period of a simple pendulum is:

a) Independent of its mass
b) Directly proportional to the square of its mass
c) Inversely proportional to its length
d) None of the above

44. The electromagnetic spectrum includes all the following except:

a) X-rays
b) Gamma rays
c) Sound waves
d) Radio waves

45. The critical angle for total internal reflection occurs when the angle of incidence is:

a) 0°
b) 45°
c) 90°
d) $90^\circ$ with respect to the normal

46. The effective resistance of two resistors connected in parallel is always:

a) Greater than either of the individual resistances
b) Less than the smaller resistance
c) Equal to the sum of the resistances
d) Greater than the sum of the resistances

47. The value of acceleration due to gravity at the Earth’s surface is:

a) 9.8 m/s²
b) 10 m/s²
c) 9.2 m/s²
d) 12 m/s²

48. The work done by a force on an object is the product of:

a) Force and displacement in the direction of the force
b) Force and velocity of the object
c) Force and time
d) Force and distance

49. A body of mass 1 kg is moving with a velocity of 10 m/s. Its kinetic energy is:

a) 10 J
b) 20 J
c) 50 J
d) 100 J

50. The electric potential energy of two charges $q_1$ and $q_2$ separated by a distance $r$ is:

a) $\frac{1}{2} k \frac{q_1q_2}{r}$
b) $k \frac{q_1q_2}{r}$
c) $\frac{1}{4\pi \epsilon_0} \frac{q_1q_2}{r^2}$
d) None of the above

---

Answer Key:

1. a) $mgh$
2. b) $F = I l B$
3. b) Ohm’s law
4. c) Electromagnetic waves
5. a) $2 \times 10^8 \, \text{m/s}$
6. b) $W = \frac{1}{2} kx^2$
7. a) $c = f \lambda$
8. b) 6 kg·m/s
9. a) It doubles
10. a) $E = \frac{1}{2} CV^2$
11. a) Zero
12. a) 0.1 s
13. b) The angle between velocity and magnetic field is $90^\circ$
14. a) Conservative forces
15. a) 20.9°
16. b) It will be doubled
17. d) Increasing the cross-sectional area
18. d) Hydrostatic pressure formula
19. a) Remove an electron from the metal
20. d) The length
21. c) -3.4 eV
22. b) Weber
23. b) $I^2$
24. d) Uniform speed
25. a) $mgh$
26. c) Reflection law
27. a) Mutual induction
28. b) The mass of the bob
29. a) $E = \frac{1}{2} kx^2$
30. a) Constant
31. b) It will double
32. a) -13.6 eV
33. b) 24 J
34. a) Force
35. a) Fleming’s left-hand rule
36. d) All of the above
37. b) Increase in temperature
38. b) Constant
39. b) Radially outward
40. b) Joule
41. a) 11.2 km/s
42. a) Electric field
43. a) Independent of its mass
44. c) Sound waves
45. d) $90^\circ$ with respect to the normal
46. b) Less than the smaller resistance
47. a) 9.8 m/s²
48. a) Force and displacement in the direction of the force
49. c) 50 J
50. b) $k \frac{q_1q_2}{r}$