### SAT - Science - Physics - Sound and Wave Motion

#### Question - 1

How is a sound wave different than a water wave?

• A Sound does not travel through water
• B A sound wave move up and down while water is a compressed wave
• C A water wave move up and down while sound is a compressed wave
• D Both are longitutinal wave

#### Question - 2

The motion of the particles of air, when sound waves pass through it is

• A Periodic
• C isothermal
• D oscillatory but not periodic

#### Question - 3

A pendulum suspended from the ceiling of a train has a time period T when the train is at rest. When the train is accelerating with a uniform acceleration, the time period will

• A increase
• B decrease
• C become infinite
• D remain unaffected

#### Question - 4

The time period T is found to depend upon L as

• A $T\propto L$
• B $T^{ 2 }\propto L$
• C $T\propto L^{ 2 }$
• D $T\propto \sqrt { 1/L }$

#### Question - 5

Through which of the following media does sound travels fastly?

• A steel
• B cold air
• C warm air
• D water

#### Question - 6

If a pendulum is allowed to oscillate into a jar containing water its time period will

• A increase
• B decrease
• C remain same
• D none of the above

#### Question - 7

K.E of  the bob of a simple pendulum is maximum

• A at the mean position
• B at the extreme left position
• C at the extreme right position
• D between mean and extreme position

#### Question - 8

When the bob is in the central position, the forces are

• A balanced
• B unbalanced
• C sometimes balanced and sometimes unbalanced
• D equilibriant

#### Question - 9

The length of a pendulum is doubled and the mass of its bob is halved. Its time period would become

• A double
• B half
• C $\sqrt { 2 }$ times
• D 4 times

#### Question - 10

The phenomenon in which the amplitude of oscillation of a pendulum decreases gradually is called

• A building up of oscillation
• B maintained oscillation
• C decay period of oscillation
• D damping     