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Recent questions in Physics

Questions >> EAMCET >> Physics

If the ratio of lengths, radii and Young's moduli of steel and brass wires shown in the figure are a,b and c respectively, the ratio between the increase in lengths of brass and steel wires would be :

asked Oct 11, 2013 by meena.p

0 answers

The displacement of a particle executing SHM is given by : $y= 5 \sin \bigg(4t+\large\frac{\pi}{3}\bigg).$ If T is the time period and the mass of the particle is $2 gms$, the kinetic energy of the particle when $t= \large\frac{T}{4}$ is given by :

asked Oct 11, 2013 by meena.p

1 answer

A body is projected vertically upwards from the surface of the earth with a velocity equal to half the escape velocity. If R is the radius of the earth , maximum height attained by the body from the surface of the earth is :

asked Oct 11, 2013 by meena.p

1 answer

A particle of mass 4 m explodes into three pieces of masses $m, m $ and $2m$. The equal masses move along X and Y axes with velocities $4 ms^{-1}$ and $6\;ms^{-1}$ respectively. The magnitude of the velocity of the heavier mass is :

asked Oct 11, 2013 by meena.p

1 answer

A body of mass 5 kg makes an elastic collision with another body at rest and continues to move in the original direction after collision direction after collision with a velocity equal to $\large\frac{1}{10}$th of its original velocity. Then the mass of the second body is :

asked Oct 11, 2013 by meena.p

1 answer

A motor of power $P_0$ is used to deliver water at a certain rate through a given horizontal pipe. To increase the rate of flow of water through the same pipe $n$ times, the power of the motor is insreased to $P_1$. The ratio of $P_1$ to $P_0$ is :

asked Oct 11, 2013 by meena.p

1 answer

A particle is projected up from a point at an angle $\theta$ with the horizontal direction. At any time $'t'$, if p is the linear momentum , y is the vertical displacement ,'x' is horizontal displacement , the graph among the following which does not represent the variation of kinetic 'k' of the particle is:

asked Oct 11, 2013 by meena.p

1 answer

A body is projected vertically upwards at time $t=0$ and it is seen at a height $'H'$ at time $t_1$ and $t_2$ seconds during its flight. The maximum height attained is : (g is acceleration due to gravity)

asked Oct 11, 2013 by meena.p

1 answer

When a wave traverses a medium , the displacement of a particle located at $'x'$ at a time $'t'$ is given by $y=a \sin (bt-cx), where a,b and c are constants of the wave, which of the following is a quantity with dimensions?

asked Oct 11, 2013 by meena.p

1 answer

When a liquid is heated in a glass vessel, its coefficient of apparent expansion is $ 1.03 \times 10^{-3}/^{\circ}C$. When the same liquid is heated in a copper vessel, its coefficient of apparent expansion is $ 1.006 \times 10^{-3}/^{\circ}C$.If the coefficient of linear expansion of copper is $ 17 \times 10^{-6}/^{\circ}C$, then the coefficient of linear expansion of the glass is

asked Oct 10, 2013 by thanvigandhi_1

1 answer

Two capillary tubes of lengths in the ratio 2 : 1 and radii in the ratio 1 : 2 are connected in series. Assume the flow of the liquid through the tube is steady. Then, the ratio of pressure difference accros the tubes is

asked Oct 10, 2013 by thanvigandhi_1

1 answer

Water rises in a capillary tube upto a height of 10 cm whereas mercury depresses in it by 3.42 cm. If the angle of contact and density of mercury are $ 135^{\circ}$ and 13.6 gm/cc respectively, then the ratio of the surface tension of water and mercury will be nearly

asked Oct 10, 2013 by thanvigandhi_1

1 answer

Force constants of two wires A and B of the same material are K and 2K respectively. If the two wires are stretched equally , then the ratio of work done in stretching $ \bigg( \large\frac{W_A}{W_B} \bigg)$ is

asked Oct 10, 2013 by thanvigandhi_1

1 answer

A particle is executing simple harmonic motion along a straight line. At displacements $r_1 \: and r_2$ from its mean position the velocities are $v_1 \: and \: v_2$ . The time period of the particle is

asked Oct 10, 2013 by thanvigandhi_1

1 answer

If earth were to rotate on its own axis such that the weight of a person at the equator becomes half the weight at the poles, then its time period of rotation is (g = acceleration due to gravity near the poles and R is the radius of earth) ( Ignore equatorial bulge)

asked Oct 10, 2013 by thanvigandhi_1

1 answer

A particle mass 'm' is attached to a thin uniform rod of length 'a' at a distance of $ \large\frac{a}{4}$ from the mid point C as shown in the figure . The mass of the rod is '4 m' . The moment of inertia of the combined system about an axis passing through 'O' and perpendicular to the rod is

asked Oct 9, 2013 by thanvigandhi_1

1 answer

A stone tied to a rope is rotated in a vertical circle with a uniform speed. If the difference between the maximum and minimum tensions in the rope is 20 N, mass of the stone in kg is $( g = 10\: ms^{-2})$

asked Oct 9, 2013 by thanvigandhi_1

1 answer

A 3 kg block is placed over a 10 kg block and both are placed on a smooth horizontal surface. The coefficient of friction between the blocks is 0.2 . If a horizontal force of 20 N is applied to 3 kg block, accelerations of the two blocks in $ ms^{-2}$ are $(g=10\: ms^{-2})$

asked Oct 9, 2013 by thanvigandhi_1

1 answer

A ball of mass 'm' moving with a horizontal velocity 'v' strikes the bob of a pendulum at rest. Mass of the bob of the pendulum is also 'm''. During this collision the ball sticks with the bob of the pendulum. The height to which the combined mass rises ( g = acceleration due to gravity )

asked Oct 9, 2013 by thanvigandhi_1

1 answer

Three particles, each of mass m are placed at the vertices of a right angled triangle as shown in figure. The position vector of the centre of mass of the system is ( O is the origin and $ \overrightarrow i , \overrightarrow j, \overrightarrow k $ are unit vectors )

asked Oct 9, 2013 by thanvigandhi_1

1 answer

A balloon starting from rest ascends vertically with uniform acceleration to a height of 100 m in 10 sec. The force on the bottom of the balloon by a mass of 50 kg is $( g=10\: ms^{-2})$

asked Oct 9, 2013 by thanvigandhi_1

1 answer

A body of mass 300 kg is moved through 10 m along a smooth inclined plane of angle $30^{\circ}$. The work done in moving in joules is $(g= 9.8\: ms^{-2})$

asked Oct 9, 2013 by thanvigandhi_1

1 answer

A body is thrown vertically upward from a point 'A' 125 m above the ground. It goes up to a maximum height of 250 m above the ground and passes through 'A' on its downward journey. The velocity of the body when it is at a height of 70 m above the ground is$ ( g = 10 \: ms^{-2})$

asked Oct 9, 2013 by thanvigandhi_1

1 answer

A person reaches a point directly opposite on the other bank of a river. The velocity of the water in the river is 4 $ms^{-1}$ and the velocity of the person in still water is 5 $ms^{-1}$. If the width of the river is 84.6 m , time taken to cross the river in seconds is

asked Oct 9, 2013 by thanvigandhi_1

1 answer

In the equation $ \bigg( \large\frac{1}{P \beta} \bigg)= \large\frac{y}{k_BT}$, where P is the pressure, y is the distance, $k_B$ is Boltzmann constant and T is the temperature. Dimensions of $ \beta $ are

asked Oct 9, 2013 by thanvigandhi_1

1 answer

Copper and carbon wires are connected in series and the combined resister is kept at $0^{\circ} C$. Assuming the combined resistance does not vary with temperature, the ratio of the resistances of carbon and copper wires at $0^{\circ}C$ is ( Temperature coefficients of resistivity of copper and carbon respectively are $4 \times 10^{-3} / ^{\circ}C\: and \: -0.5 \times 10^{-3}/^{\circ}C$)

asked Oct 9, 2013 by thanvigandhi_1

1 answer

A parallel plate capacitor with a dielectric slab with a dielectric constant 3 filling the space betwen the plates is charged to a potential V. The battery is then disconnected and the dielectric slab is withdrawn. It is then replaced with another dielectric slab of dielectric constant 2. If the energies stored in the capacitor before and after the dielectric slab is changed are $E_1\: and E_2$, then $E_1 / E_2$ are

asked Oct 9, 2013 by thanvigandhi_1

1 answer

Two capacitors having capacitances $C_1\: and \: C_2$ are charged with 120 V and 200 V batteries respectively. When they are connected in parallel now, it is found that the potential on each one of them is zero. Then

asked Oct 9, 2013 by thanvigandhi_1

1 answer

A short magnet of magnetic moment M, is placed on a straight line. The ratio of magnetic induction fields $B_1, B_3, B_3$ values on this line at points which are at distances 30 cm , 60 cm and 90 cm respectively from the center of the magnet is

asked Oct 8, 2013 by thanvigandhi_1

1 answer

A bar magnet of moment of inertia I is vibrated in a magnetic field of induction $0.4 \times 10^{-4}T$ . The time period of vibration is 12 sec. The magnetic moment of the magnet is 120$Am^2$ . The moment of inertia of the magnet is ( in $kgm^2$) approximately

asked Oct 8, 2013 by thanvigandhi_1

1 answer

Light of wavelength $ \lambda$ from a point source falls on a small circular obstacle of diameter 'd' . dark and bright circular rings around the central bright spot are formed on a screen beyound the obstacle. The distance between the screen and obstacle is D. Then, the condition for the formation of rings is

asked Oct 8, 2013 by thanvigandhi_1

1 answer

The magnifying power of the astronomical telescope for normal adjustment is 50. The focal length of the eye piece is 2cm. The required length of the telescope for normal adjustment is

asked Oct 8, 2013 by thanvigandhi_1

1 answer

A small angled prism of refractive index 1.4 is combined with another small angled prism of refractive index 1.6 to produce dispertion without deviation. If the angle of first prism is $6^{\circ}$ , the angle of the second prism is

asked Oct 8, 2013 by thanvigandhi_1

1 answer

A pipe closed at one end and open at the other end resonates with a sound of frequency 135 Hz and also with 165 Hz, but not at any other frequency intermediate between these two. Then, the frequency of the fundamental note of the pipe is

asked Oct 8, 2013 by thanvigandhi_1

1 answer

A wire of length 'L' and linear density 'm' is stretched by a force 'T' and the frequency is $n_1$. Another wire of the same material of length 2L and same linear density is stretched by a force 9T and its frequency is $n_2$ . Value of $(n_2 / n_1 )$ is,

asked Oct 8, 2013 by thanvigandhi_1

1 answer

$CH_4$ diffuses two times faster than a gas X. The number of molecules present in 32 g of gas X is : (N is Avogadro number)

asked Oct 1, 2013 by meena.p

1 answer

A transistor having a $\beta$ to $80$ has a change in base current of $250\; \mu A$ then the change in collector current is :

asked Oct 1, 2013 by meena.p

1 answer

Three particles $\alpha- particle,$ proton and deuteron are acceleration by the same potential difference. The velocities of them are in the ratio:

asked Oct 1, 2013 by meena.p

0 answers

Photoelectric emission is observed from a metallic surface for frequencies $v_1$ and $v_2$ of the incident light $(v_1 > v_2)$. If the maximum values of kinetic energy of the photo electrons emitted in the two cases are in the ratio $1:n$, then the threshold frequency of the metallic surface is :

asked Oct 1, 2013 by meena.p

1 answer

In Thomson's experiment to determine $\large\frac{e}{m}$ of an electron , it is found that an electron beam having a kinetic energy of $45.5\;eV$ remains undeflected, when subjected to crossed electric and magnetic fields. If $E=1 \times 10^{3} Vm^{-1}$, the value of $'B'$ is (mass of the electron is $9.1 \times 10^{-31}\;kg$) :

asked Sep 30, 2013 by meena.p

0 answers

The time constant of inductance coil is 3 m sec. When a $90\;\Omega$ resistance is joined in series, then the time constant becomes 0.5 m sec. The inductance and the resistance of the coil are :

asked Sep 30, 2013 by meena.p

1 answer

A capacitor $0.1\;\mu F$ connected in series to a resistor of $10 \;M \; \Omega$ is charged to a certain potential and then made a discharge through the resistor. The time in which the potential will take to fall to half its original value is (Given $\log _{10}2=0.3010$):

asked Sep 30, 2013 by meena.p

1 answer

The intensity of the magnetic induction field at the center of a single turn circular coil of radius 5 cm carrying current of $0.9A$:

asked Sep 30, 2013 by meena.p

1 answer

The thermo e.m.f of a thermo-couple is given by , $\xi =a T +bT^2,$ where $a/b=-200^{\circ}C$. If the cold function is kept at $30^{\circ}$, then the inversion temperature is ($ \xi$ in volts, T is in centigrade):

asked Sep 30, 2013 by meena.p

1 answer

Charge passing through a conductor of cross -section area $A=0.3 m^2$ is given by $q=3t^2+5t+2$ in coulombs, where 't't is in seconds. What is the value of drift velocity at $t=2$ sec. Given $n= 2 \times 10^{25}/mn^3$:

asked Sep 30, 2013 by meena.p

1 answer

$6 \Omega$ nad $12 \Omega$ resistors are connected in parallel. This combination is connected in series with a $10\;V$ battery and $6 \Omega$ resistor. What is the potential difference between the terminals of the $12 \Omega$ resistor?

asked Sep 30, 2013 by meena.p

1 answer

Two capacitors of capacities $1 \; \mu F$ and $C \;\mu F$ are connected in series and the combination is charged to a potential difference of $120 \;V$ If the charge on the combination is $80\; \mu C$, the energy stored in the capacitor of capacity C in micro- Joules is :

asked Sep 30, 2013 by meena.p

1 answer

The potential difference between two parallel plates is $10^4\;volts$. If the plates are separated by 0.5 cm, the force on an electron between the plates is :

asked Sep 30, 2013 by meena.p

1 answer

A short magnetic needle is pivoted in a uniform magnetic field of induction $1T.$ Now, simultaneously another magnetic field of induction $\sqrt 3 T$ is applied at right angles to the first field; the needle deflects through an angle $\theta'$ whose value is :

asked Sep 30, 2013 by meena.p

1 answer

The frequency of vibration magnetometer of the combination of two bar magnets of magnetic moments $M_1$ and $M_2$ is 6 Hz When like poles are tied and it is 2 Hz when the unlike poles are tied together , then the ratio $M_1 : M_2 $ is :

asked Sep 30, 2013 by meena.p

1 answer

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