Recent questions tagged 2003

A charge q is located at the centre of a cube. <br> The electric flux through any face is -

asked Jul 24, 2018 by pady_1

1 answer

The potential energy of a simple harmonic oscillator when the particle is half way to its end point is -

asked Jul 24, 2018 by pady_1

1 answer

Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities K and 2K, respectively. The equivalent thermal conductivity of the slab is -

asked Jul 24, 2018 by pady_1

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An ideal gas heat engine operates in a carnot cycle between $227^{\circ}C$ and $127^{\circ}C$. It absorbs 6 kcal at the higher temperature. The amount of heat (in kcal) converted into work is equal to -

asked Jul 24, 2018 by pady_1

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We consider the radiation emitted by the human body. Which of the following statements is true :

asked Jul 24, 2018 by pady_1

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A equiconvex lens is cut into two halves along (i) XOX' and (ii) YOY' as shown in the figure. Let f, f' f" be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively Choose the correct statement from the following-

asked Jul 24, 2018 by pady_1

1 answer

In case of a forced vibration, the resonance wave becomes very sharp when the :

asked Jul 24, 2018 by pady_1

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A particle of mass m oscillates with simple harmonic motion between points $x_1$ and $x_2$, the equilibrium position being O. Its potential energy is plotted. It will be as given below in the graph :

asked Jul 24, 2018 by pady_1

1 answer

The time period of a mass suspended from a spring is T. If is the spring is cut into four equal parts and the same mass is suspend from one of the parts, then the new time period will be -

asked Jul 24, 2018 by pady_1

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An observer moves towards a stationary source of sound with a speed $1/5^{th}$ of the speed of sound. The wavelength and frequency of the source emitted are $\lambda$ and $f$ respectively. The apparent frequency and wavelength recorded by the observer are respectively :

asked Jul 24, 2018 by pady_1

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A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will

asked Jul 24, 2018 by pady_1

2 answers

A man throws ball with the same speed vertically upwards one after the other at an interval of 2 seconds. What should be the speed of the throw so that more than two balls are in the sky at any time ? (Given $g = 9.8 m/s^2$)

asked Jul 24, 2018 by pady_1

1 answer

Two spheres of masses m and M are situated in air and the gravitational force between them is F. The space around the masses in now filled with a liquid of specific density 3. The gravitational force will now be :

asked Jul 24, 2018 by pady_1

2 answers

The vector sum of two forces is perpendicular to their vector differences. In that case, the forces :

asked Jul 24, 2018 by pady_1

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A ball rolls without slipping. The radius of gyration of the ball about an axis passing through its centre of mass is K. If radius of the ball be R, then the fraction of total energy associated with its rotational energy will be :

asked Jul 24, 2018 by pady_1

1 answer

A man weighs 80 kg He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of $5m/s^2$. What would be the reading on the scale ? ($g = 10 m/s^2$)

asked Jul 24, 2018 by pady_1

2 answers

A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the rope ? ($g = 10 m/s^2$)

asked Jul 24, 2018 by pady_1

1 answer

The acceleration due to gravity on the planet A is 9 times the acceleration due to gravity on planet B. A man jumps to a height of 2m on the surface of A. What is the height of jump by the same person on the planet B.

asked Jul 24, 2018 by pady_1

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When a long spring is stretched by 2 cm, its potential energy is U. If the spring is stretched by 10 cm, the potential energy stored in it will be :

asked Jul 24, 2018 by pady_1

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A solid cylinder of mass M and radius R rolls without slipping down an inclined plane of length L and height h. What is the speed of its centre of mass when the cylinder reaches its bottom -

asked Jul 24, 2018 by pady_1

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A stationary particle explodes into two particles of masses $m_1$ and $m_2$ which move in opposite directions with velocities $v_1$ and $v_2$. The ratio of their kinetic energies $\frac{E_1}{E_2}$ is :

asked Jul 24, 2018 by pady_1

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A thin circular ring M and radius ‘r’ is rotating about its axis with a constant angular velocity $\omega$. Four objects each of mass m, are kept gently to the opposite ends of two perpendicular diameters of the ring. The angular velocity of the ring will be -

asked Jul 24, 2018 by pady_1

1 answer

A particle moves along a circle of radius $\frac{20}{\pi}$ m with constant tangential acceleration. If the velocity of the particle is $80 m/s at the end of the second revolution after motion has begun, the tangential acceleration is : -

asked Jul 24, 2018 by pady_1

1 answer