A simple pendulum has a metal bob which is negatively charged.If it is allowed to oscillate above a positively charged metallic plate then its time period will :
increase
decrease
remain the same
become zero
What is the speed of sound in Air in m/s?
316
346
1284
1207
The speed of the bob of an oscillating pendulum is zero :
At the mean position
At an extreme position
Between the mean position and the left extreme
Between the mean position and the right extreme
A sitar player plucks the wire of a sitar.After a short time each part of the wire starts vibrating in a direction perpendicular to the wire.Is the propogation of this disturbance a longitudinal or a transverse wave ?
Longitudinal
Transverse
Stationary
Both longitudinal and transverse
Sound propagates through
Solid
Liquid
Gas
All the above
Speed of sound in Helium in m/s is:
317
965
The velocity of sound in vacuum is :
332 m/s
330 m/s
288 m/s
0
Which of these eminent scientists discovered photoelectric effect?
Albert Einstein
Heinrich Rudolph Hertz
J.J Thomson
James chadwick
Give another name for the quality of sound, which is the characteristic that enables us to distinguish it from another sound that has the same pitch and loudness:
Wavelength
Frequency
Timber
Audibility
S.I unit of wave length (λ) is
centimetre
millimetre
killometre
metre
