Recent questions in Class11

In the system shown the mass is at the centre on the turnatable is rotated at a constant angular speed 'w' . The equilibrium position is at (Consider the right side as positive x - axis and the springs are initially unstretched )

asked Mar 10, 2014 by yamini.v

1 answer

A disc of mass 'm' and radius 'r' is present on a rough surface . Find the angular frequency (w) of the S.H.M . Consider pure rolling of the disc

asked Mar 10, 2014 by yamini.v

1 answer

Find the time period of S.H.M for the following spring - mass system

asked Mar 9, 2014 by yamini.v

1 answer

A sound source of frequency 400 Hz is moving towards an observer with a velocity of 50 m/s while the observer is moving away from the source with a velocity of 40 m/s . Find the frequency heard by the observer . (Velocity of sound is 340 m/s )

asked Mar 9, 2014 by yamini.v

1 answer

A hollow sphere is tied to string and the system acts like a simple pendulum . Let the time period of the system be T . By doing which of the following , the time period of the system increases . (Do not consider extension of the string due to mass ) .

asked Mar 9, 2014 by yamini.v

1 answer

The system shown find the angular frequency (w) oscillation for S.H.M .

asked Mar 9, 2014 by yamini.v

1 answer

In an S.H.M if amplitude is 3 m and spring constant is 3 N/m and maximum velocity is 3 m/s , find the angular frequency (w) ?

asked Mar 9, 2014 by yamini.v

1 answer

Two sinusoidal machines are positioned the same distance from a worker . The intensity of sound delivered by each machine at the location of the worker is $\;2.0 \times 10^{-7}\;w/m^2\;$ . Find the sound level heard by the worker (i) when one machine is operating (ii) when both machines are operating

asked Mar 8, 2014 by yamini.v

1 answer

The sound source of frequency 400 Hz is moving towards as stationary observer with a velocity of 40 m/s . The frequency heard by the observer is (The speed of sound in medium is 340 Hz .)

asked Mar 8, 2014 by yamini.v

1 answer

An observer is moving towards a stationary source of frequency 320 Hz with a velocity of 10 m/s . The speed of sound in air is 343 m/s . The new frequency heard by the observer is

asked Mar 8, 2014 by yamini.v

1 answer

The intensity of a sound wave is $\;10^{-6}\;w/m^2\;$. The speed of the sound wave is 343 m/s . The intensity of the medium is $\;1.2\;Kg/m^3\;$. Find the $\;(\bigtriangleup p_{max})\;$ pressure amplitude of the sound wave

asked Mar 8, 2014 by yamini.v

1 answer

Sinusoidal waves 6 cm in amplitude are to be transmitted along a string that has a linear mass density of $\;4 \times 10^{-2} Kg/m\;$ . If the source can deliver a maximum power of 400 W and the string is under a tension of 100 N , what is the highest vibrational frequency at which the source can operate

asked Mar 8, 2014 by yamini.v

1 answer

A taut string for which $\;\mu=5\times 10^{-2} \;Kg/m\;$ is under as tension of 80 N . How much power must be supplied to the string to generate a sinusoidal wave at a frequency of 60 Hz and an amplitude of 6 cm ?

asked Mar 8, 2014 by yamini.v

1 answer

A spring-mass system is released from rest as shown in the figure . Initially the spring is unstretched . The equilibrium position of the system is at distance of from the initial state .$\;(g=10\;m/s^2)$

asked Mar 8, 2014 by yamini.v

1 answer

An ideal spring - mass system is oscillating . The one which remains some during the entire S.H.M period is

asked Mar 7, 2014 by yamini.v

1 answer

The time taken by a particle in S.H.M to reach from equilibrium position to one end is 25 s . The angular frequency w is

asked Mar 7, 2014 by yamini.v

1 answer

Which of the following is an example of S.H.M ( simple harmonic motion ) ?

asked Mar 7, 2014 by yamini.v

1 answer

The time period of a single pendulum is dependent on

asked Mar 7, 2014 by yamini.v

1 answer

A wave equation is given by $\;x_{1}=A \sin w(t-\large\frac{x}{K})\;$ where A is in mts , w is in Hz , x is in mts . The units of k are

asked Mar 7, 2014 by yamini.v

1 answer

Two waves of amplitudes 3 mts and 9 mts interfere . The resulting amplitude cannot be

asked Mar 7, 2014 by yamini.v

1 answer

4 waves $\;x_{1}=4 \sin5t\;, x_{2}= 8 \sin 5t\;, x_{3}=\cos 5t \;and\;x_{4}=4 \cos 5t \;$ interfere and if the final equation can be written in the form of $\;A \sin (5t+\sin^{-1}(\large\frac{B}{c}))\;$ , what is the sum of $\;A+B+C$ ?

asked Mar 7, 2014 by yamini.v

1 answer

The wave equation of 2 waves are given by $\;x_{1}=4 \sin 3t\; mts\;$ and $\;x_{2}=3 \cos 3t \;mts \;.$ The amplitude of the resulting wave is

asked Mar 7, 2014 by yamini.v

1 answer

The equation of motion of a particle is given by $x=4 sin(3t)$ mts where t is in seconds . The velocity of the particle at t=0 s is

asked Mar 7, 2014 by yamini.v

1 answer

20 waves of amplitudes 1 , 2 ...... , 9 , 20 mts are interfered . Maximum amplitude of the resulting wave is

asked Mar 7, 2014 by yamini.v

1 answer

In figure a block of mass 100 kg tied to a string of linear mass density 0.1 Kg/m . Find the frequency of the wave on the string if the length of the string is 2 mts ?

asked Mar 7, 2014 by yamini.v

1 answer

In figure a block of mass 100 kg tied to a string of linear mass density 0.1 Kg/m . Find the velocity of wave produced in the string ? (neglect string mass) $\;(g=10\;m/s^{2})$

asked Mar 7, 2014 by yamini.v

1 answer

A wave is reflected from a rigid support . The change of phase on reflection will be

asked Mar 7, 2014 by yamini.v

1 answer

Mr.A's voice has more frequency than Mr.B's voice . The velocity of Mr.A's voice is ------- than Mr.B's voice

asked Mar 7, 2014 by yamini.v

1 answer

At a pressure of 10 atm , the density of a certain gas is $\;1.4\times10^{-3}\;gm/cm\;$ . If the specific heat ratio for this gas is 1.4 , the velocity of sound in this gas is

asked Mar 7, 2014 by yamini.v

1 answer

In a stationary wave successive nodes and antinodes are separated by 25 cms . If the frequency of a vibrating particles is 250 Hz . The velocity of sound is

asked Mar 7, 2014 by yamini.v

1 answer

Density and youngs modulus of a certain hypothetical material are $\;5 \;gm/cm^{3}\;$ and $\;2\times10^{10} pa\;$ velocity of sound in this material is

asked Mar 7, 2014 by yamini.v

1 answer

At , atmosphere pressure and a certain temperature the velocity of sound is 350 m/s of a certain gas . For the same gas at same temperature the velocity of sound at 2 atm pressure is : (consider ideal gas)

asked Mar 7, 2014 by yamini.v

1 answer

Wavelength of a wave in a certain medium is 20 cm and its velocity is 350 m/s . The same wave is transmitted into a medium where the velocity is 1400 m/s . Its wavelength in the medium would be ?

asked Mar 7, 2014 by yamini.v

1 answer

A longitudinal wave of frequency 1000 Hz is travelling in a medium . At a certain point in the medium there is a compression at certain moment . How many milliseconds later would the next rare faction form at this place ? If the velocity of wave is 350 m/s , how for is the earlier compression at this time ?

asked Mar 7, 2014 by yamini.v

1 answer

A longitudinal wave of frequency 1000 Hz is travelling in a medium . At a certain point in the medium there is a compression at certain moment . How many milliseconds later would the next rare faction form at this place ?

asked Mar 7, 2014 by yamini.v

1 answer

The displacement $y$ of a particle in a medium can be expressed as $y = 10^{-6} \sin \bigg(100t + 20x + \large\frac{\pi}{4}\bigg)m$, where $t$ is in second and $x$ is in metre. The speed of the wave is

asked Feb 28, 2014 by thanvigandhi_1

1 answer

A wave travelling along the $x$ - axis is described by the equation $y(x,t) = 0.005\: \cos(\alpha x - \beta t)$. If the wavelength and time period of the wave are $0.08 \: m $ and $2\: s$, respectively, then $ \alpha$ and $ \beta$ in appropriate units are

asked Feb 28, 2014 by thanvigandhi_1

1 answer

The displacement $y$ of a wave travelling in the $x$ - direction is $y = 10^{-4} \sin(600t – 2x + \large\frac{\pi}{3})m$, where, $x$ is in $m$ and $t$ is in $s$. The speed of the wave motion in $m/s$ is

asked Feb 27, 2014 by thanvigandhi_1

1 answer

Which of the following does not represent Charle's law?

asked Feb 5, 2014 by balaji

1 answer

Which of the following does not represent Boyle's law?

asked Feb 5, 2014 by balaji

3 answers

An oxide of nitrogen at NTP has a density equal to another oxide of Nitrogen at $12^{\circ}$. If we consider pressure conditions to be the same, what are the two oxides involved?

asked Feb 5, 2014 by balaji

1 answer

At $0^{\circ}$, the density of carbon-di-oxide is the same as that of an oxide of nitrogen. The oxide of nitrogen is which of the following, considering the pressure conditions to be the same?

asked Feb 5, 2014 by balaji

1 answer

In a closed container, if we increase the temperature of the vessel, the pressure also increases due to:

asked Feb 5, 2014 by balaji

1 answer

According to Maxwell's distribution of velocities, with an increase in temperature, which of the following is true?

asked Feb 5, 2014 by balaji

1 answer

Gas-A is kept in the left partition of the container with a temperature of T at pressure 2P. Gas-B is kept in the right part of the container with a temperature of 4T at pressure P. When what is the value of the Pressure P' when the partition is removed?

asked Jan 31, 2014 by balaji

1 answer

Gas-A is kept in the left partition of the container with a volume 2V at pressure P. Gas-B is kept in the right part of the container with a volume of 3V at pressure P. Both the portions are the same temperature T. When what is the value of the Pressure P' when the partition is removed?

asked Jan 31, 2014 by balaji

1 answer

Gas-A is kept in the left partition of the container with a volume V/n at pressure P. Gas-B is kept in the right part of the container with a volume of V/(n+1) at pressure P. Both the portions are the same temperature T. When what is the value of the Pressure P' when the partition is removed?

asked Jan 31, 2014 by balaji

1 answer

Consider the following case. What is the value of P' ?

asked Jan 31, 2014 by balaji

1 answer

Hot air balloon is an application of what law?

asked Jan 31, 2014 by balaji

3 answers

Bursting of a soda bottle in summer is an example of ?

asked Jan 31, 2014 by balaji

1 answer

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