Recent questions in Class11

A ball takes t seconds to fall from height $h_1$ and $2t$ seconds to falls from height $h_2$.Then $h_1/h_2$ is

asked May 7, 2020 by priyanka.clay6

1 answer

The position x of a particle varies with time as $x=at^2-bt^3$. The acceleration of the particle will be zero at time t equal to

asked May 7, 2020 by priyanka.clay6

1 answer

A Car is able to stop with a uniform retardation of $8 ms^{-2} $ and the driver of the car can react to an emergency in 0.6 s. Calculate overall stopping distance of the car if the speed of car is $72 \;km\;h^{-1}$

asked May 7, 2020 by priyanka.clay6

1 answer

An electron starting from rest has a velocity that increases linearly with time i.e $v= kt$ where $k=2\;m\;s^{-2}$. The distance covered in the first 3 second is

asked May 7, 2020 by priyanka.clay6

1 answer

A body moving in a straight line covers a distance of $14 m $ in the 5th second and 20 m in the 8th second. How much distance will it cover in the 15th second ?

asked May 7, 2020 by priyanka.clay6

1 answer

A total of $ \$10000$ is distributed among $150$person as gift. A gift is either of $ \$50$ or $ \$100$ . Find the number of gifts of each type.

asked May 7, 2020 by priyanka.clay6

1 answer

A 150 m long train is moving with uniform velocity of 45 km/h. The time taken by train to cross the bridge of length 850 m is ?

asked May 7, 2020 by priyanka.clay6

1 answer

a body is projected vertically upward from the earths surface such that it reaches a height equal to the radius of the earth above its surface.find the velocity of projection

asked Apr 1, 2016 by rutvikjoshi1999

1 answer

Six equal resistance are connected between point P,Q,R as shown in the fig. Then the net resistance will be maximum between

asked Feb 8, 2016 by meena.p

1 answer

A solenoid carrying a current supplied by a DC source with constant emf contains iron rod inside it. when the rod is pulled out of the solenoid , then the current in the solenoid will

asked Feb 8, 2016 by meena.p

1 answer

In an AC circuit V and I are given by $V=100 \sin (100 t) volt \; I =100 \sin (100 t +\large\frac{\pi}{3})amp$ the power dissipated in the circuit is

asked Feb 8, 2016 by meena.p

1 answer

An aeroplane is moving north horizontally , with a speed of $200 ms^{-1}$ ,at a place where the vertical component of the earth's magnetic field is $ 0.5 \times 10^{-4}\;T$ .What is the induced e.m.f set up between the tips of the wings, if they are 10 m apart ?

asked Feb 8, 2016 by meena.p

1 answer

If vectors $\overrightarrow{A} = \cos wt \hat i +\sin w + \hat j$ and $\overrightarrow{B} = \cos wt/2 \hat i +\sin wt/2 + \hat j$ are functions of time , then the value of t at which are orthogonal to each other is

asked Feb 8, 2016 by meena.p

1 answer

A child is standing with his two arms outstretched at the center of a turntable that is rotating about its central axis with an angular speed $w_0$ Now the child folds his hands back so that the moment of inertia becomes 3 times the intial values.The new angular speed is

asked Feb 8, 2016 by meena.p

1 answer

Three planets of same density and with radii $R_1,R_2$ and $R_3$ Such that $R_1=2R_2=3R_3$, have gravitational fields on the surfaces $E_1,E_2,E_3$ and escape velocities $v_1,v_2,v_3$ respectively ,then

asked Feb 8, 2016 by meena.p

1 answer

A block of wood floats in water with $\large\frac{4}{5}$ th of its volume submerged , but it just floats in a liquid . What is the density of the liquid ?

asked Feb 8, 2016 by meena.p

1 answer

A clock with an iron pendulum beeps correct time at $15 ^{\circ}c$ what will be the error in time per day , if the room temperature is $20^{\circ}$?

asked Feb 8, 2016 by meena.p

1 answer

A charge q is placed at the centroid of an equilateral triangle. Three charges equal to Q are placed at the vertices of the triangle . The system of the four charges will be in equilibrium . if q is equal to

asked Feb 8, 2016 by meena.p

1 answer

Two H atoms in the ground state collide elastically. The maximum amount by which their combined kinetic energy reduced is

asked Feb 8, 2016 by meena.p

1 answer

The total energy in the ground state of hydrogen atom is $ -13.6\;eV$ . The kinetic energy of this electron in first excited state is :

asked Feb 8, 2016 by meena.p

1 answer

Ina common emitter configuration, a transistor have $\beta= 50$ and input resistance $1k \omega$ . If the peak value of a.c input is $0.01\;V$ then the peak value of collector current is

asked Feb 8, 2016 by meena.p

1 answer

A ratio station has two channels . one is AM at $1020 kHz$ and the other FM at $89.5$ MHz. For good results you will use

asked Feb 8, 2016 by meena.p

1 answer

A ball is dropped to the ground from a height of 8 m. The coefficient of restitution is 0.5 . To what height will the ball rebound?

asked Feb 8, 2016 by meena.p

1 answer

An astronaut is looking down on Earth's surface from a space shuttle at an attitude of 400 km. Assuming that the assonants pupil diameter is 5 mm and wave length of visible light is 500 nm, the assonant will be able to resolve linear objects of the size of about

asked Feb 8, 2016 by meena.p

1 answer

The second overtone of an openpipe has the same frequency as the first overtone of a closed pipe 2m long . Calculate the length of the open pipe .

asked Feb 8, 2016 by meena.p

1 answer

A horizontal platform with an object placed on it is executing is $3.92 \times 10^{-3}$ what must least period of these oscillation , So that the object is not detached from the platform?

asked Feb 8, 2016 by meena.p

1 answer

A parallel plate capacitor c with plates of unit area and separation d is filled with a liquid of dielectric constant $k=2$ The level of the liquid is$\large\frac{d}{3}$ initially . Suppose the liquid level decreases at constant speed V, the time constant as a function of time t is

asked Feb 8, 2016 by meena.p

1 answer

The work done in turning a magnet of magnetic moment by an angle of $90^{\circ}$ from the meridian is n times the corresponding work done to turn it through an angle of $60^{\circ}$ . The value of n is given by

asked Feb 8, 2016 by meena.p

1 answer

A conductivity loop in the form of a circle is placed in a uniform magnetic field with its plane perpendicular to the direction of the field. An e.m.f will be included in the loop if

asked Feb 8, 2016 by meena.p

1 answer

An objects is located 4 m from the first of two thin covering lenses of focal length 2 m and respectively . The lenses are separated by 3 m. The final image formed by the second less is located from the source ata distance if :

asked Feb 8, 2016 by meena.p

1 answer

A Tv transmitting antenna is $128$ m tall. If the reactivating antenna is at the ground level, the maximum distance between them for satisfactory communication is LOS mode is (R of earth $=6.4 \times 10^6 m)$

asked Feb 8, 2016 by meena.p

1 answer

A person carrying a whistle entitling continuously a note of 272 Hz is running towards a reflecting surface with a speed of $18 km h^{-1}$. The speed of sound in air is $345 ms^{-1}$ The number of beats heard by him is

asked Feb 8, 2016 by meena.p

1 answer

In the circuit shown in the fig the battery is ideal. A voltmeter of resistance $600 \Omega$ is connected in turn across $R_1$ and $R_2$ , giving reading $V_1$ and $V_2$ respectively . Then

asked Feb 8, 2016 by meena.p

1 answer

Two deuterium nuclei each of mass m, fuse together to form a helium nucleus , releasing an energy E. If C is the velocity of light , the mass of helium nucleus formed will be

asked Feb 8, 2016 by meena.p

1 answer

A boat which has a speed of $5\;kmh^{-1}$ in still water crosses a river of width 1 km along the shortest possible path in 15 mints . The velocity the river water in $kmh^{-1} $ is

asked Feb 8, 2016 by meena.p

1 answer

A resister of $500 \Omega$ an inductance of $0.5$ H are in series with an ac which is given by $v= 100 \sqrt 2 \sin (1000 t)$. The passer factor of the combination is :

asked Feb 8, 2016 by meena.p

1 answer

The base current of transistor is $100 \mu A$ and the collector current is $2mA$ . What is the current gain for the common base configuration ?

asked Feb 8, 2016 by meena.p

1 answer

The moment of inertia of the system of four spheres about the side AD, when four solid spheres each of mass m and radius r are located with their centers on four corners of a square ABCD of slide a is :

asked Feb 8, 2016 by meena.p

1 answer

If we have a cylinder container of radius R and height h is completely filled with a liquid . There are two horizontal L shaped pipes of small cross section 'a' are connected to the cylinder . Now if the two pipes are opened . Then torque would be applied by the liquid is ?

asked Dec 19, 2015 by Samagraguptajpr

1 answer

A spherical hole is made in a solid sphere of radius R. the mass of the sphere before hollowing was M. The gravitational field at the centre of the hole due to the remaining mass is

asked Dec 13, 2015 by pavani.ind

1 answer

A cable that weighs 1.5 kg/meter and is attached to a bucket that weighs 75 kg. Initially, there are 500 kg of grain in the bucket and as the bucket is raised 2 kg of grain leaks out of a hole in the bucket for every meter the bucket is raised. The bucket is 200 meters below a bridge. How much work is required to raise the bucket to the top of the bridge?

asked Dec 13, 2015 by afiani.09

1 answer

A 150m long train is moving with uniform velocity of 45km / h. The time taken by train to cross the bridge of length 850m is ?

asked Jun 15, 2015 by _1

3 answers

In the circuit as shown in the figure what is the potential difference between P and Q.

asked Apr 30, 2015 by meena.p

1 answer

is position vector a localized vector?

asked Apr 21, 2015 by johnsenjohnsen0

0 answers

how to represent a vector?

asked Apr 20, 2015 by johnsenjohnsen0

1 answer

The type of isomerism found in vrea molecule is

asked Apr 15, 2015 by meena.p

1 answer

A string wrapped around a solid cylinder of mass M and radius R. The string is pulled vertically upward to prevent the centre of mass of the cylinder from falling as the cylinder unwinds the string. Choose the correct options: (A). the tension in the string is 2Mg (B). the length of the string unwound until its angular velocity becomes w is w^2R^2/2g (C).the angular acceleration of the cylinder is 2g/3R (D).work done by tension on the cylinder until its angular velocity becomes w is 1/4Mw^2R^2

asked Mar 27, 2015 by agarwal795

0 answers

Consider a mass m attached to a string of length l performing vertical circle.find an expression for velocity at any point and tension at any point .

asked Mar 5, 2015 by venkatesh.purushotham

1 answer

A body is strained within elastic limits .Show that work done , in the process is 1/2 x stress x strain .

asked Mar 5, 2015 by venkatesh.purushotham

1 answer

question gave coefficient of friction to be " k " for both the blocks but if put k1=k2=k then F=0 how is this possible?

asked Dec 1, 2014 by harsha.wardan7

1 answer

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