Physics Past Questions and Answers

A magnified and virtual image of a near object is produced by

A Prism binoculas
B Astronomical telescope
C Periscope
D Simple microscope

Question 3177:

A girl stand 80m away from a tall cliff and blows a whistle. If the speed of sound in air is 330ms^-1, how long would it take for her to hear the echo of the sound?

A 2.062s
B 0.970s
C 0.485s
D 0.242s

Question 3178:

Which of the following reasons explains why the walls and ceilings of a standard concert hall are usually covered with perforated pads? To

A Increase the intensity of sound waves
B Increases the loudness of the sound waves
C Reduce the effect of revibration of sound waves
D Decreases thr frequency of sound waves

Question 3179:

The sound from a vibrating tuning sound is when the tip of its stem is placed on a wooden table than when in air because

A The friction between the table and the tuning fork generates additional energy
B Air molecules obsorb sound wave but wood transmit sound waves
C The table increases the frequency of the turning fork
D A large mass of air is set into vibration by the table

Question 3180:

Charges on a conductor are

A Evenly distributed over a surface of any shape
B Concentrate on the inner surface of the conductor
C Concentrate at the outer flat surface of the conductor
D Generally concentrated at sharply curved surface