HARD
RRB Group D CBT
IMPORTANT
Earn 100

During a thunderstorm, the thunder in the sky is produced by the_____.

1. Meeting of cumulonimbus clouds in the sky.

2. Lightning that separates the nimbus clouds.

3. Violent upward movement of air and water particles.

Select the correct answer using the codes given below.

33.33% studentsanswered this correctly

Important Questions on Oscillations and Waves

HARD
RRB Group D CBT
IMPORTANT

Consider the following statements:

1. A widely used musical scale called the diatonic scale has seven scales.

2. The frequency of the note Sa (Sa) is 256 Hz and that of Ni 512 Hz.

Which of the statements given above is/are correct?

HARD
RRB Group D CBT
IMPORTANT

Assertion (A): A jet aircraft moving at Mach number equal to 1 travel faster at an altitude of 15 km than while moving at Mach number equal to 1 near the sea level.

Reason (R): The velocity of sound depends on the temperature of the surrounding medium.

MEDIUM
RRB Group D CBT
IMPORTANT

Consider the following statements:

1. A flute of smaller length produces waves of lower frequency

2. Sound travels in rocks in the form of longitudinal elastic waves only

Which of the statements given above is/are correct?

MEDIUM
RRB Group D CBT
IMPORTANT

What does the term Dolby B or Dolby C printed on tape-recorders and other sound systems refer to?

EASY
RRB Group D CBT
IMPORTANT
In which one of the following the speed of sound is maximum?
MEDIUM
RRB Group D CBT
IMPORTANT

Consider the following statements:

Statement I: The velocity of sound in air increases due to the presence of moisture in it.

Statement II: The presence of moisture in the air lowers the density of air.

Which of the above statement (s) is/are correct?

MEDIUM
RRB Group D CBT
IMPORTANT
The bulk modulus and the density of water are greater than those of air. With this much information, we can say that the velocity of sound in air_____.
MEDIUM
RRB Group D CBT
IMPORTANT

Consider the following statements:

Statement I: When a particle is executing simple harmonic motion, total energy varies with time.

Statement II: Audible waves have a frequency range of 30 kHz to 30 MHz.

Which of the above statement (s) is/are correct?