A body can have consutant velocity when it follows a
1.elliptical path
2.circular path
3.parabolic path
4.rectilinear path
A body moving along the circumference of a circle completes two revolutions. If the radius of the circular path is R the ration of displacement to the covered path will be
1.? R
2.2? R
3.zero
4.4? R
A cyclist cycling around a circular racing track skids because
1.the centripetal force upon him is less than limiting friction
2.the centripetal force upon him is greater then limiting friction
3.the centripetal force upon him is equal to the limiting friction
4.the friction between the tyres of the cycle and road vanishes
A simple pendulum has a bob of mass m and its frequency is f. If we replaced the bob with a heavier one say of 2m then that will be its new frequency?
1.1/4f
2.1/2f
3.frequency lower than 20 Hz
4.2f
A stationary wave is set up in the air column of a closed pipe. At the closes end of the pipe
1.always an node in formed
2.always an antinode is formed
3.neither node nor antinode is formed
4.sometimes a node and sometimes an antinode is formed
A stone is whirled in a vertical circle at the end of a string. When the stone is at the highest position the tension in the string is
1.maximum
2.zero
3.equal to the weight of the stone
4.less than the weight of the stone
According to Newton sound travel in air under the conditions of
1.adiabatic
2.isothermal
3.isobaric
4.isochoric
Angular speed of seconds hand of a watch in rads-1 is
1.?
2.?/2
3.?/30
4.?/180
Beats are the results of
1.diffraction of sound waves
2.constructive and destructive interference
3.polarization
4.destructive interference
Centripetal force performs
1.maximum work
2.minimum work
3.negative work
4.no work
Doppler effect applies to
1.sound wave only
2.light wave only
3.both sound and light waves
4.neither sound nor light wave
If a car moves with a uniform speed of 2 ms-1 in a circle of radius 0.4. Its angular speed is
1.4 rad. S-1
2.5 rad. S-1
3.1.6 rad. S-1
4.2.8 ms-1
If a wheel of radius r turns through an angle of 30? then the distance through which any point on its rim moves is
1.? /3 x r
2.?/6 x r
3.?/30 x r
4.? / 180 x r
If stretching force T of wire increases, then its frequency
1.decreases
2.increases
3.remains the same
4.any of above
If we whirl a stone at the end of a string in the vertical circle, it is likely to break when the stone is
1.at the highest point
2.at the lowest point
3.at any point during motion
4.at the point where gravity is not acting
In angular motion, Newtons second law of motion is
1.F=ma
2.F=?p/?t
3.? = 1a
4.all above
In case of planets the necessary acceleration is provided by
1.Gravitational force
2.frictional force
3.coulomb force
4.centripetal force
In open organ pipe
1.only even harmonics are present
2.only odd harmonics are present
3.both even and odd harmonics are present
4.selected harmonics are present
In vibrating cord the points where the amplitude is maximum, are called
1.antinodes
2.nodes
3.troughs
4.crests
Increase in velocity of sound in the air for 1 ?C rise in temperature is
1.1.61 ms-1
2.61.0 ms-1
3.0.61 ms-1
4.2.00 ms-1
It is possible to distinguish between transverse and longitudinal waves form the property of
1.refraction
2.polarization
3.interference
4.diffraction
On loading the prong of a tuning form with wax its frequency
1.increases
2.decreases
3.remains unchanged
4.may increase or decrease
Silence zone takes place due to
1.constructive interference
2.destructive interference
3.beats
4.resonance
Sound waves do not travel in vacuum because
1.they are transverse waves
2.they are stationary waves
3.they require material medium for propagation
4.they do not have enough energy
The angular speed for daily rotatio of earth in rad S-1 is
1.2 ?
2.?
3.4 ?
4.7.3 x 10-5 rads-1
The circumference subtends an angle
1.? radianradian
2.2? radian
3.?/2 radian
4.4? radian
The dimension of elastic modulus ? is
1.ML-1T-2
2.ML-2T-2
3.MLT-2
4.ML2T-2
The distance between any two consecutive crests or troughs is called
1.frequency
2.period
3.wave length
4.phase difference
The distance between consecutive node and anitnode is
1.?
2.?/2
3.2?
4.?/4
The distance between two consecutive nodes is
1.?/2
2.?/4
3.?
4.2?
The normal ear is the most sensitive in the frequency range
1.20000 to 30000 hertz
2.10 to 20 hertz
3.2000 to 4000 hertz
4.6000 to 8000 hertz
The number of beats produced per second is equal to
1.the sum of the frequencies of two tuning forks
2.the difference of the frequencies of two tuning forks
3.the ratio of the frequencies of two tuning forks
4.the frequency of either of the two tuning forks
The periodic alternation of sound between maximum and minimum loudness are called
1.silence zone
2.interference
3.beats
4.resonance
The relation between linear and angular acceleration is
1.a = a x r
2.a = r x a
3.a = a x r
4.r = a x a
The shaft of a motor rotates at a constant angular speed of 360rev/min. Angle turned through in 1 sec in radian is
1.?
2.3?
3.6?
4.12?
The span of broad jump depends upon
1.mass of the jumper
2.height of jump
3.angle of projection
4.none
The velocity of sound in air would become double than its velocity at 0?C at temperature
1.313?C
2.586?C
3.819?C
4.1172?C
The velocity of sound is greatest in
1.Water
2.air
3.copper
4.ammonia
The waves that require a material medium for their propagation are called
1.matter waves
2.electromagnetic waves
3.carrier waves
4.mechanical waves
Ultrasonic have
1.frequency in the audible range
2.frequency is greater than 20 kHz
3.frequency lower than 20 Hz
4.all of above
Velocity of sound in vacuum is
1.332 ms-1
2.320 ms-1
3.Zero
4.224 ms-1
Waves transmit __________________ from one place to another
1.energy
2.mass
3.both
4.none
What is outward force acting on a mass of 10 kg when rotating at one end an inelastic string 10m long at speed of 1m/s?
1.1N
2.10N
3.2N
4.100N
When a body is whirled in a horizontal circle by means of a string the centripetal force is supplied by
1.mass of a body
2.velocity of body
3.tension in the string
4.centripetal acceleration
When a body moves in a circle of radius r with linear speed V its centripetal force is
1.mV/r2
2.mV/r
3.mV2/r
4.mV2/r2
When a wheel 1 m in diameter makes 30 rev min the linear speed of point on its rim in ms-1 is
1.2?
2.?/2
3.?
4.20?
When the source of sound moves away form a stationary listener then _________ occurs.
1.an apparent increase in frequency
2.an apparent decrease in frequency
3.an apparent decrease in wavelength
4.no apparent change in frequency
When two identical traveling waves are superimposed, the velocity of the resultant wave
1.decreases
2.increases
3.remains unchanged
4.becomes zero
Which one is the correct relation for fundamental frequency of open and closed pipe?
1.fopen = 2 fclosed
2.fclosed = 2fopen
3.fopen = fclosed
4.fopen = 1 / f closed
Which one is the correct relation?
1.VNewton = V Laplace
2.VNewton =
3.VNewton =
4.VNewton =