Recent questions tagged 6

For a cell involving one electron$ E^\ominus$ cell = 0.59V at 298 K, the equilibrium constant for the cell reaction is :- $\bigg[Given \;that \frac{2.303RT}{F}=0.059V \;at \;T=298k\bigg]$

asked Jul 8, 2019 by pady_1

1 answer

A person standing on the edge of a well throws a stone vertically upwards with an initial velocity 5 m/s. The stone goes up, comes down and falls in the well making a sound. If the person hears the sound 3s after throwing, the water is at a depth from ground given by (neglect time of travel for the sound and take $g = 10\;m/s^2$):

asked Dec 19, 2018 by pady_1

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Water drops fall from a tap on the floor 5 m below at regular intervals of time, the first drop striking the floor when the fifth drop begins to fall. The height at which the third drop will be, from ground, at that instant when first drop strikes the ground, will be, (taking $g = 10 \; ms^{-2}$ ) :

asked Dec 19, 2018 by pady_1

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Two similar bar magnets $P$ and $Q$ each of magnetic moment $M$ are taken. If $P$ is cut along its axial line and $Q$ is cut along its equatorial line all the four pieces obtained have each of :

asked Dec 19, 2018 by pady_1

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A body of capacity $4 \; \mu F$ is charged to $80\;V$ and another body of capacity $6 \; \mu F$ is charged to $30\;V$. When thet are connected the energy lost by $4 \; \mu F$ capacitor is :

asked Dec 11, 2018 by pady_1

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If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter a :

asked Dec 11, 2018 by pady_1

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Curie temperature is the temperature above which :

asked Dec 11, 2018 by pady_1

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Two masses $m_ = 5\; kg$ and $m_2 = 10 kg$ connected by an inextensible string over a frictionless pulley are moving as shown in the figure . The coefficient of friction of horizontal surface is 0.15. The minimum weight m that should be put on top of $m_2$ to stop the motion is : <br>

asked Dec 11, 2018 by pady_1

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Let $k$ be an integer such that the triangle with vertices $(k, -3k),\; (5, k)$ and $(-k, 2)$ has area 28 sq. units. Then the orthocentre of this triangle is at the point :

asked Dec 11, 2018 by pady_1

1 answer

A satellite is revolving in a circular orbit at a height 'h' from the earth's surface (radius of earth R; $h << R$). The minimum increase in its orbital velocity required, so that the satellite could escape from the earth's gravitational field, is close to : (Neglect the effect of atmosphere.)

asked Dec 11, 2018 by pady_1

0 answers

Consider a thin uniform square sheet made of a rigid material. If its side is $'a'$, mass m and moment of inertia I about one of its diagonals, then :

asked Dec 11, 2018 by pady_1

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Match List-I (Electromagnetic wave type) with List-II (Its association / application) and select the correct option from the choices given below the lists: <br>

asked Dec 11, 2018 by pady_1

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Four successive members of the first row transition elements are listed with atomic numbers. Which one of them is expected to have the highest $E^0_{M^{3+}/M^{2+}}$ value ?

asked Dec 11, 2018 by pady_1

0 answers

If the integral $\begin{align} \int \frac{5 \tan x}{\tan x - 2} dx = x + a \;In |\sin x - 2 \cos x | + k \end{align}$, then $a$ is equal to

asked Dec 11, 2018 by pady_1

1 answer

Two particles are executing simple harmonic motion of the same amplitude A and frequency $\omega$ along the $x-axis$. Their mean position is separated by distance $X_0(X_0 > A)$. If the maximum separation between them is $(X_0+ A)$, the phase difference between their motion is :

asked Dec 11, 2018 by pady_1

0 answers

One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of $44\; u$. The alkene is

asked Dec 11, 2018 by pady_1

0 answers

In an optics experiment, with the position of the object fixed, a student varies the position of a convex lens and for each position, the screen is adjusted to get a clear image of the object. A graph between the object distance $u$ and the image distance $v$, from the lens, is plotted using the same scale for the two axes. A straight line passing through the origin and making an angle of $45^{\circ}$ with the $x$-axis meets the experimental curve at $P$. The coordinates of $P$ will be

asked Nov 29, 2018 by pady_1

0 answers

The point diametrically opposite to the point P (1, 0) on the circle $x^2 + y^2 + 2x + 4y - 3 = 0$ is

asked Nov 29, 2018 by pady_1

0 answers

A body weighing 13 kg is suspended by two strings 5 m and 12 m long, their outer ends being fastened to the extremities of a rod 13 m long. If the rod be so held that the body hangs immediately below the middle point. The tensions in the strings are :

asked Nov 29, 2018 by pady_1

0 answers

A particle located at $x=0$ at time $t=0$, starts moving along the positive $x$-direction with a velocity $'v'$ that varies as $v = \alpha \sqrt{x}$. The displacement of the particle varies with time as :

asked Nov 13, 2018 by pady_1

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If the cube roots of unity are 1, $\omega, \omega^2$, then the roots of the equation $(x-1)^3 + 8 = 0$, are :

asked Nov 5, 2018 by pady_1

0 answers

Out of the following pairs, which one does not have identical dimensions ?

asked Nov 5, 2018 by pady_1

0 answers

Let $A = \begin{pmatrix} 0 & 0 & -1 \\ 0 & -1 & 0 \\ -1 & 0 & 0 \end{pmatrix}$. The only correct statement about the matrix $A$ is

asked Nov 5, 2018 by pady_1

0 answers

A carbon resistor of $(47 \pm 4.7) \; k \Omega$ is to be marked with rings of different colours for its identification. The colour code sequence will be :

asked Aug 21, 2018 by pady_1

1 answer

Which one of the following pairs of species have the same bond order?

asked Aug 21, 2018 by pady_1

1 answer

Two electrons occupying the same orbital are distinguished by:

asked Aug 21, 2018 by pady_1

1 answer

Which one of the following pairs of solution is not an acidic buffer ?

asked Aug 21, 2018 by pady_1

1 answer

A balloon with mass 'm' is descending down with an acceleration 'a' (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration 'a' ?

asked Aug 20, 2018 by pady_1

1 answer

A uniform force of $(3 \hat{i} + \hat {j})$ newton acts on a particle of mass 2 kg. Hence the particle is displaced from position $(2 \hat {i} + \hat{k})$ meter to position $(4 \hat{i} + 3 \hat{j} - \hat{k})$ meter. The work done by the force on the particle is -

asked Aug 20, 2018 by pady_1

1 answer

A solid cylinder of mass 3 kg is rolling on a horizontal surface with velocity $4 ms^{–1}$. It collides with a horizontal spring of force constant $200 Nm^{–1}$ . The maximum compression produced in the spring will be

asked Aug 20, 2018 by pady_1

1 answer

The instantaneous angular position of a point on a rotating wheel is given by the equation $\theta (t) = 2t^3 - 6 t^2$ <br> The torque on the wheel becomes zero at :

asked Aug 16, 2018 by pady_1

1 answer

The radii of circular orbits of two satellite A and B of the earth, are 4R and R, respectively speed of satellite A is 3V, then the speed satellite B will be –

asked Jul 26, 2018 by pady_1

1 answer

A block of mass M is attached to the lower end : of a vertical spring. The spring is hung from a ceiling and has force constant value k. The mass is released from rest with the spring initially unstretched. The maximum extension produced in the length of the spring will be :

asked Jul 26, 2018 by pady_1

1 answer

Sand is being dropped on a conveyor belt at the rate of M kg/s. The force necessary to keep the belt moving with a constant velocity of v m/s will be -

asked Jul 26, 2018 by pady_1

1 answer

A vertical spring with force constant K is fixed on a table. A ball of mass m at a height h above the free upper end of the spring falls vertically on the spring so that the spring is compressed by a distance d. The net work done in the process is:-

asked Jul 26, 2018 by pady_1

1 answer

Two cells, having the same e.m.f., are connected in series through an external resistance R. Cell have internal resistances $r_1$ and $r_2$ ($r_1>r_2$) respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is:-

asked Jul 25, 2018 by pady_1

1 answer

Two batteries, one of emf 18 volts and internal resistance $2\Omega$ and the other of emf 12 volt and internal resistance $1\Omega$, are connected as shown. The voltmeter V will record a reading of.

asked Jul 24, 2018 by pady_1

1 answer

Which one of the following statements is true for the speed 'v' and the acceleration 'a' of a particle executing simple harmonic motion

asked Jul 24, 2018 by pady_1

2 answers

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

1 answer

Displacement between max. P.E. position and max. K.E. position for a particle excuting simple harmonic motion is : -

asked Jul 23, 2018 by pady_1

1 answer

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

asked Jul 20, 2018 by pady_1

1 answer

Two projectiles of same mass and with same velocity are thrown at an angle 60º & 30º with the horizontal, then which quantity will remain same :

asked Jul 20, 2018 by pady_1

1 answer

Two pendulums suspended from same point having length 2m and 0.5m. If they displaced slightly and released then they will be in same phase, when small pendulum will have completed :

asked Jun 15, 2018 by pady_1

1 answer

Sarika roughly estimates product 54 X 96 as following, - She rounded each number to the nearest ten. - Then she multiplied the numbers What is her estimate ?

asked Dec 31, 2015 by pady_1

1 answer

Complete the Numerical Series: 12, 9, 27, 24, 72, 69, , , __

asked Dec 31, 2015 by pady_1

0 answers

Find the breadth of a rectangle whose length is 200 cm and area is 10 m^2.

asked Dec 31, 2015 by pady_1

0 answers

What is the multiplicative inverse of 28?

asked Dec 31, 2015 by pady_1

0 answers

In an examination, Sherry scored 89% marks out of 750 marks. How many marks did he get?

asked Dec 31, 2015 by pady_1

0 answers

question no. 25 of exercise 6.5

asked Jan 9, 2014 by guptaaakanksha2_1

1 answer

question no. 25 of exercise 6.5

asked Jan 9, 2014 by guptaaakanksha2_1

0 answers

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