Recent questions and answers in 2001

Energy is released in nuclear fission is due to

answered Nov 5, 2019 by meena.clay6

1 answer

A 1 kg stationary bomb is exploded in three parts having mass 1 : 1 : 3 respectively. Parts having same mass move in perpendicular direction with velocity 30 $ms^{–1}$ , then the velocity of bigger part will be

answered Nov 5, 2019 by meena.clay6

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$M_n$ and $M_p$ represet the mass of neutron and proton respectively. An element having mass M has N neutron and Z-protons, then the correct relation will be : -

answered Nov 5, 2019 by meena.clay6

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A photo-cell is illuminated by a source of light, which is placed at a distance d from the cell. If the distance become d/2, then number of electrons emited per second will be : -

answered Nov 5, 2019 by meena.clay6

1 answer

250 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m then the load is lifted to 3m, the efficiency of pulley system will be : -

answered Nov 5, 2019 by meena.clay6

2 answers

In BCC, the distance between two nearest atoms will be : -

answered Nov 5, 2019 by meena.clay6

1 answer

Copper and silicon is cooled from 300 K to 60 K, the specific resistance : -

answered Nov 5, 2019 by meena.clay6

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The resistance of each arm of the wheat stone bridge is 10 ohm. A resistance of 10 ohm is connected in series with galvanometer then the equivalent resistance across the battery will be :

answered Nov 5, 2019 by meena.clay6

1 answer

Among which the magnetic susceptibility does not depend on the temperature : -

answered Nov 5, 2019 by meena.clay6

1 answer

The energy of hydrogen atom in $n^{th}$ orbit is $E_n$ then the energy in nth orbit of singly ionised helium atom will be : -

answered Nov 5, 2019 by meena.clay6

1 answer

The interplaner distance in a crystal is $2.8\times 10^{-8}$ m. The value of maximum wavelength which can be diffracted

answered Nov 5, 2019 by meena.clay6

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The equation of a wave is represented by $y = 10^{-4} \sin (100t - \frac{x}{10}) m$ , then the velocity of wave will be :-

answered Nov 5, 2019 by meena.clay6

1 answer

If number of turn, area and current through it is given by n, A and i respectively then its magnetic moment will be :-

answered Nov 5, 2019 by meena.clay6

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A dipole of moment $\overrightarrow{p}$ is placed in uniform electric field $\overrightarrow{E}$ then torque acting on it is given by :-

answered Nov 5, 2019 by meena.clay6

1 answer

For a common emmiter circuit if $\frac{I_C}{I_E} = 0.98$ then current gain for common emitter circuit will be :-

answered Nov 5, 2019 by meena.clay6

1 answer

For a coil having $L=2$ mh, current flow through it is $I = t^2 e^{-t}$ then the time at which emf become zero :-

answered Nov 5, 2019 by meena.clay6

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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 :-

answered Nov 5, 2019 by meena.clay6

1 answer

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

answered Nov 5, 2019 by meena.clay6

1 answer

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

answered Nov 5, 2019 by meena.clay6

1 answer

Tangent galvanometer is used to measure : -

answered Nov 5, 2019 by meena.clay6

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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 :-

answered Nov 5, 2019 by meena.clay6

2 answers

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

answered Nov 5, 2019 by meena.clay6

1 answer

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

answered Nov 4, 2019 by meena.clay6

1 answer

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 :-

answered Nov 4, 2019 by meena.clay6

2 answers

Which one among shows particle nature of light.

answered Nov 4, 2019 by meena.clay6

1 answer

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

answered Nov 1, 2019 by meena.clay6

1 answer

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 :-

answered Nov 1, 2019 by meena.clay6

1 answer

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?

answered Nov 1, 2019 by meena.clay6

1 answer

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

answered Nov 1, 2019 by meena.clay6

1 answer

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

answered Nov 1, 2019 by meena.clay6

1 answer

The total energy of particle performing SHM depend on :-

answered Nov 1, 2019 by meena.clay6

1 answer

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

answered Oct 31, 2019 by meena.clay6

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 :-

answered Oct 31, 2019 by meena.clay6

1 answer

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

answered Oct 31, 2019 by meena.clay6

1 answer

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 : -

answered Oct 31, 2019 by meena.clay6

2 answers

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

answered Oct 31, 2019 by meena.clay6

1 answer

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

answered Oct 31, 2019 by meena.clay6

1 answer

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 : -

answered Oct 30, 2019 by meena.clay6

1 answer

Biological importance of Ozone layer is : -

answered Oct 30, 2019 by meena.clay6

1 answer

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

answered Oct 30, 2019 by meena.clay6

1 answer

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

answered Oct 30, 2019 by meena.clay6

1 answer

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 : -

answered Oct 30, 2019 by meena.clay6

1 answer

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 : -

answered Oct 30, 2019 by meena.clay6

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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 : -

answered Oct 30, 2019 by meena.clay6

1 answer

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> $(g = 10 m/s^2)$

answered Oct 30, 2019 by meena.clay6

1 answer

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

answered Oct 30, 2019 by meena.clay6

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Which rays contain (+Ve) charged particle :-

answered Oct 30, 2019 by meena.clay6

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Following truth table represent which logic gate -

answered Oct 30, 2019 by meena.clay6

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Darwins theory of pangenesis shows similarity with theory of inheritance of acquired characters then what shall be correct according to it : -

asked Jul 20, 2018 by pady_1

2 answers

Occurence of endemic species in south america and Australia due to : -

asked Jul 20, 2018 by pady_1

1 answer

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