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Recent questions in Physics

Questions >> EAMCET >> Physics

The refracting angle of a prism is A and the refractive index of the material of the prism is $\cot (A/2)$. The angle of minimum deviation of the prism is :

asked Nov 20, 2013 by meena.p

1 answer

Assertion (A): Optical fibres are widely used in communication network. Reason (R): Optical fibers are small in size, light weight, flexible and there is no scope for interference in them.

asked Nov 20, 2013 by meena.p

1 answer

Assertion (A): Optical fibres are widely used in communication network. Reason (R): Optical fibers are small in size, light weight, flexible and there is no scope for interference in them.

asked Nov 20, 2013 by meena.p

0 answers

An iron load of 2 kg is suspended in air from the free end of a sonometer wire of length 1 m. A tuning fork is : (Specific gravity of iron=8)

asked Nov 20, 2013 by meena.p

0 answers

The wavelengths of two notes in air are $\large\frac{36}{195}$$m$ and $\large\frac{36}{193}$$m$. Each note produces 10 beats per second separately with a third note of fixed frequency.The velocity of sound in air in m/s is :

asked Nov 20, 2013 by meena.p

1 answer

In the figures shown below :

asked Nov 18, 2013 by thanvigandhi_1

0 answers

If 200 MeV of energy is released in the fission of 1 nucleus of $_{92}U^{235}$, the number of nuclei that undergo fission to produce energy of 10 kwh in one second :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

The surface of a metal has work function 2.66 e V. This is illuminated with photons of wavelength 450 nm. Te de Broglie wavelength of the emitted photoelectrons is : ( Mass of electron = $9 \times 10^{-31}$ kg)

asked Nov 18, 2013 by thanvigandhi_1

1 answer

The threshold frequency of the metal of the cathode in a photoelectric cell is $ 1 \times 10^{15}\: Hz$ . When a certain beam of light is incident on the cathode, it is found that a stopping potential '4.144 V' is required to reduce the current to zero. The frequency of the incident radiation is : $ ( h = 6.63 \times 10^{-34} J-s)$

asked Nov 18, 2013 by thanvigandhi_1

3 answers

A wire loop PQRSP is constructed by joining two semi - circular coils of radii $'r_1'\: and \: 'r_2'$ respectively as shown in the figure. If the current flowing in the loop is $'i'$ , then the magnetic induction at the point $'O'$ is :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

A metal rod of length 2 m is rotating with an angular velocity of 100 radiance / second in a plane perpendicular to a uniform magnetic field of 0.3 T. The potential difference between the ends of rod is :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

A wire of length 6.28 m is bent into a circular coils of 2 turns. If a current of 0.5 A exists in the coil, the magnetic moment of the coil is, in $ A-M^2$ :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

For a thermocouple the temperature of cold junction $(T_c)$ neutral temperature $(T_n) $ and temperature of inversion $(T_i)$ are $ 0^{\circ}C, 285^{\circ}C\: and \: 585^{\circ}C$ respectively. If the temperature of cold junction is raised to $ 10^{\circ}C$ then :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

The current voltage graph for a given metallic wire at two different temperatures $T_1\: and \: T_2$ is shown in the figure. The temperature $T_1\: and \: T_2$ are related as :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

A battery of e.m.f 2.1 V and internal resistance $0.05 \Omega$ is shunted for 5 seconds by a wire of constant resistance $ 0.02 \Omega$ , mass 1 g and specific heat $ 0.1 cal/g/^{\circ}C$ . The rise in the temperature of the wire is :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

Four charges of magnitude - 'Q' are placed at the four corners of a square and a charge 'q' is at its centre. If the system is in equilibrium the value of 'q' is :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

The plates in a parallel plate capacitor are seperated by a distance 'd' with air as a medium between the plates. In order to increase the capacity by 66%, a dielectric slab of dielectric constant '5' is introduced between the plates. What is the thickness of the dielectric slab ?

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A short bar magnet is arranged with its North pole pointing geographical North. It is found that the horizontal component of Earth's magnetic induction ($B_H$) is balanced by the magnetic induction of the magnet at a point which is at a distance of 20 cm from its center . The magnetic moment of the magnet is : $( If \: B_H = 4 \times 10^{-5}\: Wb\: m^{-2})$:

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A short magnet oscillating in vibration magnetometer with a frequency 10 Hz . A downward current of 15 A is established in a long vertical wire placed 20 cm to the west of the magnet. The new frequency of the short magnet is : ( The horizontal component of earth's magnetic field is 12 $ \mu$ T)

asked Nov 17, 2013 by thanvigandhi_1

1 answer

If the ratio of maximum and minimum intensities of an interference pattern is 36 : 1, then the ratio of amplitudes of the two interfering waves will be :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A thin prism of angle $ 6^{\circ}$ made up of glass of refractive index 1.5 is combined with another prism made up of glass of refractive index 1.75 to produce dispersion without deviation. The angle of second prism is :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

The magnification produced by an astronomical telescope for normal adjustment is 10 and the length of the telescope is 1.1 m. The magnification, when the image is formed at least distance of distinct vision is :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A ray of light travels from an optically denser medium towards rarer medium. The critical angle for the two media is 'C'. The maximum possible angle of deviation of the ray is :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A sound wave travels with a velocity of $ 300\: ms^{-1}$ through a gas. 9 beats are produced in 3 sec when two waves pass through it simultaneously. If one of the waves has 2 m wavelength, the wavelength of the other wave is :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A source of sound producing wavelength of 50 cm is moving away from stationary observer with $ \large\frac{1}{5}th $ speed of sound. Then, what is the wavelength of sound heard by observer ?

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A cylinder of radius 'R' made of material of coefficient of thermal conductivity $'k_1'$ is surrounded by a cylindrical shell of inner radius 'R' and outer radius 2 R made of a material of coefficient of thermal conductivity $'k_2'$ . The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in the steady state. The effective coefficient of thermal conductivity of the system is :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A lead bullet of unknown mass is fired with a speed of $ 180 \: ms^{-1}$ into a tree in which it stops. Assuming that in this process two third of heat produced goes into the bullet and one third into wood. The temperature of the bullet raises by : ( Specific heat of lead $= 0.120 \: Jg^{-1\circ}C^{-1}$)

asked Nov 17, 2013 by thanvigandhi_1

1 answer

One mole of an ideal gas ( y = 1.4 ) is adiabatically compressed so that its temperature rises from $ 27^{\circ} C \: to \: 35^{\circ}C$. The change in the internal energy of the gas is $(R=8.3\: J \: mol^{-1}K^{-1}$) :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

The pressure P for a gas is plotted against its absolute temperature T for two different volumes $V_1\: and \: V_2$ where $ V_1 > V_2$ . If P is plotted on $y$ - axis and T on $x$ - axis then :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

An ideal gas is initially at temperature T and volume V. Its volume is increased by $ \Delta V$ due to an increase in temperature $ \Delta T$ , pressure remaining constant. The physical quantity $ \delta = \large\frac{\Delta V}{V \Delta T}$ varies with temperature as :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A tank of height 5 m is full of water. There is a hole of cross sectional area $1\: cm^2$ in its bottom. The value of water that will come out from this hole per second is ($ g = 10 m/s^2$)

asked Nov 16, 2013 by thanvigandhi_1

1 answer

A spherical liquid drop of diameter D breaks up to n identical spherical drops. If the surface tension of the liquid is $' \sigma'$ is , the change in energy in this process is :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

A 4.0 m long copper wire of cross sectional area $ 1.2 \: cm^2$ is stretched by a force of $ 4.8 \times 10^3N$ If Young's modulus for copper is $ Y = 1.2 \times 10^{11}\: N/m^2$ , the increase in length of wire and strain energy stored per unit volume are :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

A mass M is suspended from a light spring. An additional mass m is added, displaces the spring further by a distnce 'x'. Now the combined mass will oscillate with a period :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

The period of revolution of Jupiter around the sun is 12 times the period of revolution of the earth around the sun. The distance between the Jupiter and sun is n times the distance between the earth and sun. Then the value of n is :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

The radius of gyration of a solid sphere of radius R about a certain axes is also equal to R. If r is the distance between the axes and the centre of a sphere , then r is equal to

asked Nov 16, 2013 by thanvigandhi_1

1 answer

PQR is a right angled triangular plate of uniform thickness as shown in the figure. If $ I_1, I_2 \: and \: I_3$ are moments of Inertia about PQ, QR and PR axes respectively, then :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

A car is travelling along a curved road of radius r. If the coefficient of friction between the tyres and the road is $ /mu$ , the car will skid if its speed exceeds :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

Two particles A and B initially at rest move towards each other under a mutual force of attraction. At the instant when the velocity of A is V and that of B is 2 V , the velocity of centre of mass of the system is :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

A sphere of mass m moving with constant velocity hits another stationary sphere of the same mass. If 'e' is the coefficient of restitution, then the ratio of velocities of the two spheres after the collision will be :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

The kinetic energy energy K of a particle of mass 'm' moving along a circle of radius 'R' depends on distance covered 'S' as $K =AS^2$. Then the acceleration of particle is given by :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

Match conservation laws in List-I with the processes in List-II :

asked Nov 15, 2013 by thanvigandhi_1

1 answer

An electron moving at a speed of $ 5 \times 10^6\: ms^{-1}$ is shot through a sheet of paper which is $ 2.1 \times 10^{-4}\: cm$ thick. The electron emerges from the paper with speed of $ 2 \times 10^6\: ms^{-1}$ . The time taken by the electron in seconds to pass through the paper sheet is :

asked Nov 15, 2013 by thanvigandhi_1

1 answer

A man moves 20 m North, then 10 m east and then $ 10\sqrt2$m south-west, his displacement is :

asked Nov 15, 2013 by thanvigandhi_1

0 answers

A body weight 22.42 gm and has a measured volume of 4.7 cc. The possible error in the measurement of mass and volume are 0.01 gm and 0.1 cc. Then the maximum error percentage in the density will be :

asked Nov 15, 2013 by thanvigandhi_1

1 answer

A black body of mass $34.38\;g$ and surface area$19.2\;cm^2$ is at an initial temperature of $400\;K$. It is allowed to cool inside an evacuated enclosure kept at constant $0.04^{\circ}c$ per second. The specific heat of the body in $J\;kg^{-1} K^{-1}$ is : (Stefan's constant $\sigma = 5.73 \times 10^{-8} Wm ^{-2} K^{-4})$

asked Nov 13, 2013 by meena.p

1 answer

If 4 moles of an ideal monoatomic gas at temperature $400 \;K$ is mixed with 2 moles of another ideal monoatomic gas at temperature $700\;K$ the temperature of the mixture is :

asked Nov 13, 2013 by meena.p

1 answer

The pressure and density of a given mass of a diatomic gas $\bigg(\gamma =\large\frac{7}{5}\bigg)$ change adiabatically from $(P,d)\;to \; (P',d'')$. If $\large\frac{d''}{d}$$=32$, then $\large\frac{P'}{P}$ is $(\gamma$= ratio of specific heats)

asked Nov 13, 2013 by meena.p

1 answer

Two identical vessels A and B with frictionless pistons contains the same ideal gas at the same temperature and the same volume V. The masses of gas in A and B and $m_A$ and $m_B$ respectively. The gases are allowed to expand isothermally to the same final volume 2V. The change in pressures of the gas in A and B are found to be $\Delta P$ and $1.5 \Delta\;P$respectively. Then:

asked Nov 13, 2013 by meena.p

1 answer

A metallic solid sphere is rotating about its diameter as axis of rotation . If the temperature is increased by $200^{\circ}C$, the percentage increase in its moment of inertia is : (Coefficient of linear expansion of the metal $=10^{-5/^{\circ}C}$)

asked Nov 13, 2013 by meena.p

1 answer

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