JAMB`S UTME 2012 PHYSICS Questions and Answers On Waves

39. Which of the following factors will affect the velocity of sound?

A. An increase in the pitch of the sound

B. An increase in the loudness of the sound

C. Wind travelling in the same direction of the sound

D. A change in the atmospheric pressure constant temperature

Answer

40. The characteristics of a vibration that determines its intensity is the…

A. frequency  

B. overtone

C. wavelength

D. amplitude

Answer

41. Where can a man place his face to get an enlarged image when using a concave mirror to shave?

A.  between the center of curvature and the principal focus

B. At the principal focus 

C. Between the principal focus and the pole 

D. At the center of curvature

Answer

42. A pinhole camera is placed 300m in front of a building so that the image is formed on the screen 5cm from the pinhole. If the image is 2.5cm high, the height of the building will be…

 A. 25m

B. 50m

C. 100m

D. 150m

Answer

43. The magnification of an object 2cm tall placed 10cm in front of a plane mirror is

A.6.0 

B. 1.0 

C. 0.7 

D. 0.6

Answer

44. After reflection from the concave mirror, rays of light from the sun converges 

A. at the radius of curvature 

B. at the focus 

C. beyond the radius of curvature

D. between the focus and the radius of curvature.

Answer

45. A glass block of thickness 10cm is placed on an object. If an observer views the object vertically, the displacement of the object is  …………… [ refractive index of glass = 1.5]

A. 3.33cm

B. 5.00cm 

C. 6.67cm 

D. 8.50cm

Answer

46. i. Rays of light travels from a less dense medium to a denser medium 

       ii. The angle of incidence is greater than the critical angle

       iii. Rays of light travels from a denser medium to a less dense medium

A. I and ii only 

B. I and iii only 

C. ii and iii only 

D. ii only

Answer

47. The use of lenses is not applicable in the…

A. projector  

B. human eye

C. periscope

D. telescope

Answer

48. Dispersion of white light is the ability of white light to

A. penetrate air, water and glass

B. move in a straight line

C. move around corners

D. separate into its component colours

Answer