Golden Future Education Center (Chp 6 to 11)

Sound waves can travel in all the following except. 

• solids   

• liquids   

• air

• vacuum

How does the speed of sound vary in the following media, water, air and wood?

• Air /water

• Water/ wood   

• Wood/ water 

• Wood/ air

Which one of the following statements is true for both sound and light waves?  

• They are transverse waves.

• They are reflected from a glass surface.

• They travel faster in air than in water.

• They are electromagnetic waves.

Which one of the following frequencies of sound cannot be detected by the human car?

        

• 50Hz

• 500 Hz

• 5000Hz

• 50000Hz

The displacement of an air particle with time as a sound wave travels through the air is as shown above. What is the frequency of the sound wave?                           

• 10 Hz  

• 25 Hz  

• 50 Hz  

• 100Hz

Which often following is the normal audible frequency range of a human ear?

• 0-10000 Hz

• 0-20000 Hz

• 20-20 000 Hz

• 100 -100 000 Hz

A sound of frequency 400 Hz has a wavelength of 4.0 m in a medium. What is the speed of sound in the medium?            

• 10^-2ms^-1     

• 100 ms^-1  

• 1600 ms^-1  

• 8000 ms^-1

When air object is at the centre of curvature of a concave mirror the magnification is

• 0.5

• -1

• 1

• 1.5

The main force responsible for the formation of the universe is;                                                                               

• gravity

• frictional force

• magnetic force

• electrical force

The approximate age of the universe is;                         

• 1 billion years old and 14 days  

• 14 billion years old    

• 140 billion years old  

• 13.7 billion years old