physics test 3

1. Robin Hood had to apply a force of 50 N to stretch the bowstring by 10 cm. What is the equivalent spring constant of the bowstring?

5N/m

50 N/m

500N/m

0.5N/m

2. Which of the following statements is true about a mass, which is attached to a spring and moves with simple harmonic motion on a frictionless horizontal surface?

The kinetic energy of the mass is maximum at the end positions.

The kinetic energy of the mass is maximum at the equilibrium position.

The potential energy of the mass is maximum at the equilibrium position.

The potential energy of the mass is minimum at the end positions.

3. What causes the restoring force in a simple pendulum?

friction between the thread and the support

the force exerted on the pendulum bob while displacing it from the mean position

the component of the weight of the bob acting perpendicular to the thread

the component of the weight of the bob acting parallel to the thread

4. What is the frequency of a pendulum which completes 30 cycles in 3 minutes?

6Hz

90Hz

10 Hz

0.17 Hz

5. Which letter represents the wavelength of the wave in the diagram below? (attached: question 5)

A

B

C

E

6.Which letter represents the amplitude of the wave in the diagram below? (attached: question 6)

A

B

C

D

7. Which of the following statements is true about a pulse that travels from a denser medium to a lighter medium as shown in the diagram below?

The reflected pulse in medium 1 will be inverted.

TheThe reflected pulse in medium 1 will not be inverted.

The transmitted pulse in medium 2 will be inverted.

The width of the transmitted pulse in medium 2 will be less than the width of the incident pulse in medium 1.

8. Which property of the sound wave doesn’t change when it travels from one medium to another?

amplitude

frequency

wavelength

speed

9. In which of the following situations will Doppler Effect not be observed?

An ambulance rushes toward the stationary observer with its siren blaring.

The observer rushes toward the stationary ambulance when its siren is blaring.

The ambulance moves at a high speed with its siren blaring and the observer is seated inside.

The ambulance rushes away from the stationary observer with its siren blaring.

10. A guitar has a power output of 0.25 W. If the sound waves emitted by the guitar travel in spherical wavefronts, what will be the intensity of the sound at a distance of 4 m?

1.24 x 10^-3 W/m²

4.98 x 10^-3 W/m²

2.49 x 10^-3 W/m²

1.56 x 10^-2 W/m²

^{11. If sound is increased in intensity by a factor of 100,000, what is the change in decibels?}

⁵

⁵⁰

⁵⁰⁰

^100,000

^{12. Which of the following statements is not true about resonance?}

^{It is easy to get an object to vibrate at its resonant frequencies but difficult to get it vibrate at other frequencies.}

^{A simple pendulum has many resonant frequencies called harmonics.}

^{A spring-mass system has only a single resonant frequency.}

Vibrating strings and air-columns have many resonant frequencies called harmonics.

13. The third harmonic of a guitar string has a frequency of 170 Hz. What is the length of the guitar string if the speed of the waves on the string is 125 m/s?

1.103 m

2.206 m

0.368 m

2.040 m

14. Which of the following statements is not true about the standing wave patterns set up in the vibrating air column inside a pipe closed at only one end?

All harmonics are present.

Only odd harmonics are present.

The closed end of the pipe always has a displacement node.

The closed end of the pipe always has a pressure antinode.

15. If you blow across the open end of a glass bottle, a tone of 300 Hz is produced. What will be the frequency of the next harmonic produced if you blow much harder?

300 Hz

600 Hz

900 Hz

1200 Hz

16. Jack and Jill blow their whistles at the same time producing sound waves at frequencies of 400 Hz and 404 Hz respectively. How many beats per second are heard from the superposition of the two waves?

400

404

4

8

17. What is the wavelength of visible light of 6 x 10¹⁴ Hz frequency?

500 nm

400 nm

4000 nm

4 nm

18. What is the frequency of X-rays of 10 nm wavelength?

6 x 10¹⁶ Hz

3 x 10¹⁶ Hz

3.00 Hz

6 x 10⁸ Hz

19. Which of the following statements is true about electromagnetic radiation?

Gamma rays travel faster than X-rays in vacuum.

X-rays travel faster than gamma rays in vacuum.

Both gamma rays and X-rays travel at the same speed in vacuum.

Infrared rays travel slower than both gamma rays and X-rays in vacuum.

20.If you know the frequency of any form of electromagnetic radiation, you can determine its wavelength as for all electromagnetic radiation:

Frequency is directly proportional to speed.

Frequency is inversely proportional to wavelength.

Wavelength is directly proportional to frequency.

Wavelength is directly proportional to speed.

21. How many times brighter will a candle appear when it is brought 4 times closer?

2

4

8

16

22. Which of the following is an example of specular reflection?

light reflected from the disturbed water surface of a ripple tank

light reflected from the rear-view mirror

light reflected from the surface of paper

light reflected from the surface of a tree trunk

23. Which of the following is an example of diffuse reflection?

light reflected from the surface of a dry asphalt roadway

light reflected from the surface of a calm lake

light reflected from the surface of glossy paper

light reflected from the surface of a shiny metal plate

24. Which of the following statements is not true if an incident ray of light makes an angle of 30^o with the mirror surface?

angle of incidence = 30^o

angle of reflection = 60^o

angle of incidence = 60^o

angle between incident ray and reflected ray = 120degrees

25.What is the image distance of a 4 cm tall object placed 40 cm from a concave mirror having a focal length of 10 cm?

-13.3 cm

13.3 cm

-40.0 cm

40.0 cm

26.What is the magnification of a 4 cm tall object placed 40 cm from a concave mirror having a focal length of 10 cm?

0.33

-0.33

1.33

-1.33

27. Which combination of primary additive colors will produce yellow-colored light?

green and blue

blue and red

red and green

cyan and magenta

28. Light cannot be linearly polarized by:

transmission

reflection

diffraction

diffraction

29. Which of the following statements is not true about refraction?

Refraction occurs when light’s velocity changes.

The angle between the refracted ray and the normal is called the angle of refraction.

When light moves from a rarer to a denser medium, it bends toward the normal.

The path of a light ray that crosses the boundary between two different media is irreversible.

30. What is the angle of refraction of a light ray that enters the surface of a calm lake from air at an angle of 45^o to the normal? The refractive index of water is 1.333.

32.04^o

45.00^o

59.99^o

33.76degrees

31. A 5.00 cm tall candle is placed at a distance of 50.0 cm from a double convex lens having a focal length of 15.0 cm. What is the image distance?

-21.4 cm

21.4 cm

65 cm

35 cm

32. A 5.00 cm tall candle is placed at a distance of 50.0 cm from a double convex lens having a focal length of 15.0 cm. What is the magnification of the image?

-0.429

-2.33

0.429

2.33

33. What is the critical angle of light traveling from benzene (n=1.501) into air?

40.05^o

48.22^o

41.78^o

62.63 degrees

34. The mirage, a phenomenon of nature, is produced by:

atmosphere refraction

Total internal reflection

Dispersion

Scattering

35. Which of the following equations describes the condition for observing the fourth bright fringe in Young’s double-slit interference pattern? Assume n = 0 for the central bright fringe.

d sinθ = λd

sinθ = 3λ/2d

sinθ = 3λd

sinθ = 4λ

36. Which of the following equations describe the condition for observing the fourth dark fringe in an interference pattern correctly?

d sinθ = λ

d sinθ = 4λ

d sinθ = 5λ/2

d sinθ = 7λ/2

37. Monochromatic light of wavelength 550 nm passes through a diffraction grating that has 55000 lines/m. A bright line appears on the screen at an angle of 12.23^o from the central bright fringe. What is the order of this bright line?

5

6

7

8

38. The resolving power of an optical instrument decreases when:

Shorter wavelengths of light are used.

Longer wavelengths of light are used.

The opening of the aperture is made wider.

The angle between the resolved objects is made smaller.

39. The wavelength of the light produced by the laser is determined by the:

type of energy added to the active medium

length of the tube in which the laser is produced

composition of the active medium

diameter of the semi-transparent mirror

40. Which of the following properties of laser light enables us to use it to measure distances with great precision?

All the light waves emitted by the laser have the same direction.

The light waves are coherent.

The light waves are monochromatic.

The individual waves effectively work like a single wave with very large amplitude.

41. A water wave is generated in a ripple tank by an oscillator that vibrates 50 times in 30 seconds. A given trough of the wave travels 50.0 cm in 15 seconds. What is the wavelength of the water wave? Produce all your workings

42. When the pendulum bob reaches the mean position, the net force acting on it is zero. Why then does it swing past the mean position?

43. The distance between a 10 cm tall candle and the reflecting surface of a concave mirror is 40 cm. The radius of curvature of the mirror is 25 cm. Now,

A. What is the focal length of the mirror?

B. What is the image distance?

C. What is the magnification of the image?

D. What is the height of the image?

E. State whether the image is real or virtual and whether it is upright or inverted.

44. In an experiment conducted using the Young’s double-slit apparatus, the separation between the slits is 20 µm. A first-order constructive interference fringe appears at an angle of 2.5^o from the zero^th order (central) fringe.

A. What wavelength of light is used in the experiment?

B. At what angle would the fourth-order (m = 4) bright fringe appear?

C. At what angle would the fourth-order (m=4) dark fringe appear?

 

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