Recent questions tagged past papers

Fuse wire is a wire of

asked Jul 24, 2018 by pady_1

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Solar energy is mainly caused due to :

asked Jul 24, 2018 by pady_1

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Three capacitors each of capacity $4 \mu F$ are to be connected in such a way that the effective capacitance of $6 \mu F$. This can be done by -

asked Jul 24, 2018 by pady_1

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In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is :

asked Jul 24, 2018 by pady_1

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An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the water in the kettle boils in 10 minutes. When the other coil is used the water boils in 40 minutes. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be :-

asked Jul 24, 2018 by pady_1

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Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 volt a.c. supply line. The power drawn by the combination in each case respectively will be :

asked Jul 24, 2018 by pady_1

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A bar magnet is oscillating in the Earth's magnetic field with a period T. What happens to this period and motion if this mass is quadrupled -

asked Jul 24, 2018 by pady_1

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A charged particle moves through a magnetic field in a direction perpendicular to it. Then the

asked Jul 24, 2018 by pady_1

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A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is -

asked Jul 24, 2018 by pady_1

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An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The coulomb force $\overrightarrow{F}$ between the two is - <br> (where $K = \frac{1}{4 \pi \varepsilon_0}$ )

asked Jul 24, 2018 by pady_1

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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If a ball is thrown vertically upwards with speed u, the distance covered during the last ‘t’ seconds of its ascent is :

asked Jul 24, 2018 by pady_1

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Organisms which obtain energy by the oxidation of reduced inorganic compounds are called : - (a)Photo autotrophs

asked Jul 23, 2018 by pady_1

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Stool of a person contain whitish grey colour due to malfunction of which type of organ

asked Jul 23, 2018 by pady_1

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Nucleus of a donor embryonal cell/somatic cell is transferred to an enucleated egg cell. Then after the formation of organism, what shell be true : -

asked Jul 23, 2018 by pady_1

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Introduction of food plants developed by genetic engineering is not desirable because -

asked Jul 23, 2018 by pady_1

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Collagen is : -

asked Jul 23, 2018 by pady_1

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Jacob and Monad studied lactose metabolism in E.Coli and proposed operon concept. Operon concept applicable for : - (a)All prokaryotes

asked Jul 23, 2018 by pady_1

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Out of 64 codons, 61 codons code for 20 types of amino acid it is called : -

asked Jul 23, 2018 by pady_1

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A diseased man marries a normal woman. They get three daughter and five sons. All the daughter were diseased and sons were normal. The gene of this disease is : -

asked Jul 23, 2018 by pady_1

2 answers

In a DNA percentage of thymine is 20% then what is the percentage of guanine : -

asked Jul 23, 2018 by pady_1

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A plant of $F_1$-generation with genotype "AABbCC". On selfing of this plant what is the phenotypic ratio in F2-generation : -

asked Jul 23, 2018 by pady_1

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What is the reason of formation of embryoid from pollen grain in tissue culture medium

asked Jul 23, 2018 by pady_1

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If a diploid cell is treated with colchicine then it becomes : -

asked Jul 23, 2018 by pady_1

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Which statement is correct for bacterial transduction : -

asked Jul 23, 2018 by pady_1

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Transformation experiment was first performed on which bacteria : -

asked Jul 23, 2018 by pady_1

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In bacteria, plasmid is : -

asked Jul 23, 2018 by pady_1

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In which animal nerve cell is present but brain is absent : -

asked Jul 23, 2018 by pady_1

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