Physics Basic Unit#4 Test

A source of sound of frequency 500 Hz is moving towards on observer with velocity 30 ms^–1. The speed of sound is 330 ms^–1. The frequency heard by observer will be:

• 550 Hz

• 458.3 Hz

• 530 Hz

• 454.5 Hz

The velocity time graph of – harmonic oscillation is shown the figure below, the frequency of oscillation is

• 12.25 Hz

• 2.5Hz

• 33.3 Hz

• 50Hz

A body executes SHM. The PE, KE and TE are measured as a function of displacement "x". Which of the following statements is true

• TE = 0 when x = 0

• KE is maximum when x is maximum

• KE is maximum when x = 0

• PE is maximum when x = 0

Which of the following quantity connected with SHM do not vary periodically?

• Total energy

• Displacement

• Velocity

• Acceleration

An observer on the sea shore observes 54 waves reaching the cost per minute. If the wavelength is 10 m. The velocity is

• 18 ms^–1

• 36 ms^–1

• 9 ms^–1

• 54 ms^–1

The distance between two consecutive antinodes is 0.5m. The distance travelled by the wave in half the time period is

• 2 m

• 0.5 m

• 1 m

• 0.25 m

A particle is executing S.H.M, then the graph of acceleration as a function of displacement is

• ellipse

• circle

• parabola

• straight line

The phase difference between the particles vibrating at two consecutive nodes is:

• π

• Zero

• 2π

• π/2

The frequency of an open organ pipe is "n". If one end is closed, then its fundamental frequency will be:

• n/2

• 3n/4

• n

• 2n

The ratio of frequencies in a stretched string is:

• 1 : 2 : 3

• 1 : 3 : 5

• 3 : 2 : 1

• 2 : 4 : 6