Recent questions tagged past papers

If specific resistance of a potentiometer wire is $10^{-7} \Omega m$ and current flow through it is 0.1 A, cross-sectional area of wire is $10^{-6} m^2$ then potential gradient will be :-

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A disc is rolling the velocity of its centre of mass is $V_cm$ then which one will be correct :-

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A capacitor of capacity C and reactance X if capacitance and frequency become double then reactance will be :-

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Tangent galvanometer is used to measure : -

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On the horizontal surface of a truck a block of mass 1 kg is placed ($\mu = 0.6$) and truck is moving with acceleration $5 m/s^2$ then the frictional force on block will be :-

asked Jul 20, 2018 by pady_1

2 answers

Energy per unit volume for a capacitor having area A and separation d kept at potential difference V is given by :-

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In Thomson mass spectrograph $\overrightarrow{E} \bot \overrightarrow {B}$ then the velocity of underflected electron beam will be :

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Two waves having equation <br> $x_1 = a \sin (\omega t + \phi_1)$ <br> $x_2 = a \sin (\omega t + \phi_2)$ <br> If in the resultant wave the frequency and amplitude remains equals to amplitude of superimposing waves. Then phase diff. between them :-

asked Jul 20, 2018 by pady_1

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Which one among shows particle nature of light.

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Optical fibre are based on :-

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If $|\overrightarrow{A}+\overrightarrow{B}| = |\overrightarrow{A} | = |\overrightarrow{B}| $ then angle between A and B will be :-

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A cyclindrical rod having temperature $T_1$ and $T_2$ at its end. The rate of flow of heat $Q_1$ cal/sec. If all the linear dimension are doubled keeping temperature remain const. then rate of flow of heat $Q_2$ will be :-

asked Jul 20, 2018 by pady_1

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A ray of light travelling in air haves wavelength λ, frequency n, velocity v and intensity I. If this ray enters into water then these parameter are$\lambda', n' , v' and I'$ respectively. Which relation is correct?

asked Jul 20, 2018 by pady_1

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A disc is placed on a surface of pond which has refractive index $\frac{5}{3}$. A source of light is placed 4 m below the surface of liquid. The minimum radius of disc will be so light is not coming out

asked Jul 20, 2018 by pady_1

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With what velocity should a particle be projected so that its height becomes equal to radius of earth -

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The total energy of particle performing SHM depend on :-

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If the tension and diameter of a sonometer wire of fundamental frequency n is doubled and density is halved then its fundamental frequency will become

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3 answers

A cricketer catches a ball of mass 150 gm in 0.1 second moving with speed $20 ms^{-1}$. Then he experiences force of :-

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A scientist says that the efficiency of his heat engine which work at source temperature $127^{\circ} C$ and sink temperature $27^{\circ} C$ to $26%$, then

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Half life of radioactive element is 12.5 Hour and its quantity is 256 gm. After how much time its quantity will remain 1 gm : -

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$X(n, \alpha)$ $^7_3Li$, then X will be :-

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A charge Q $\mu c$ is placed at the centre of cube, the flux coming out from any surfaces will be :-

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Two springs A and B having spring constant $K_A$ and $K_B$ . ($K_A= 2K_B$ ) are stretched by applying force of equal magnitude. If energy stored in spring A is E then energy stored in B will be : -

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Biological importance of Ozone layer is : -

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The current (I) in the circuit will be : -

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A child is sitting on a swing. Its minimum and maximum heights from the ground is 0.75 m and 2 m respectively, its maximum speed will be

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Two particles having mass 'M' and 'm' are moving in a circular path having radius R and r respectively. If their time period are same then the ratio of angular velocity will be : -

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A black body has wavelength $\lambda_m$ corresponding to maximum energy at 2000 K. Its wavelength corresponding to maximum energy at 3000 K will be : -

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A particle is projected making angle $45^{\circ}$ with horizontal having kinetic energy K. The kinetic energy at highest point will be : -

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A particle is thrown vertically upward. Its velocity at half of the height is 10 m/s. Then the maximum height attained by it :- <br> $(g = 10 m/s^2)$

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An electron having mass 'm' and kinetic energy E enter in uniform magnetic field B perpendicularly, then its frequency will be :-

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Following truth table represent which logic gate -

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Which rays contain (+Ve) charged particle :-

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The dimension of Planck constant equals to that of :

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What shall be the effect of destruction of wild life :

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Living beings maintain continuity of life by :

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Stored food in fungi :

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Most of the mutations are :

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In which stage of cell cycle, DNA replication occurs :

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In Drosophila the XXY condition leads to femaleness whereas in human beings the same condition leads to Klienfelter's syndrome in male. It proves :

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Method of DNA replication in which two strands of DNA separates and synthesize new strands :

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Which of the following is initiation codon :

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First cloned animal :

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Which of the following ribosomes are engaged in protein synthesis in animal cell :

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What happens in plants during vascularisation :

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ATP is :

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Which statement is correct :

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Primary function of enteronephric nephridia of Pheretima :

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Length of one loop of B- DNA :

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Similarity in Ascaris lumbricoides and Anopheles stephensi :

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