Recent questions tagged 21

The manganate and permanganate ions are tetrahedral, due to

asked Jul 8, 2019 by pady_1

1 answer

A real gas can be approximated to an ideal gas at :

asked Dec 19, 2018 by pady_1

1 answer

The elongation of a steel wire stretched by a force is $e$. If a wire of the same material of double the length, and half the diameter is subjected to double the force, its elongation will be :

asked Dec 19, 2018 by pady_1

0 answers

The fundamental physical quantities that have same dimensions in the dimensional formula of torque and angular momentum are :

asked Dec 19, 2018 by pady_1

0 answers

When a resistor of $11 \; \Omega$ is connected in series with an electric cell, the current flowing in it is $0.5 \;A$. Instead, when a resistor of $5 \Omega$ is connected to the same electric cell in series, the current increases by $0.4 \;A$. The internal resistance of the cell is :

asked Dec 11, 2018 by pady_1

0 answers

Two identical particle move towards each other with velocity $ 2v$ and $v$ respectively. The velocity of centre of mass is :

asked Dec 11, 2018 by pady_1

0 answers

A car moving with a speed of $50\; km/h$, can be stopped by brakes after at least $6 \;m$. If the same car is moving at a speed of $100\; km/h$, the minimum stopping distance is :

asked Dec 11, 2018 by pady_1

0 answers

A silver atom in a solid oscillates in simple harmonic motion in some direction with a frequency of $10^{12}/sec$. What is the force constant of the bonds connecting one atom with the other? (Mole wt. of silver = 108 and Avagadro number = $6.02 \times 10^{23} gm\; mole^{-1}$)

asked Dec 11, 2018 by pady_1

0 answers

Let $\overrightarrow{a} = 2 \hat{i} +\hat{j} - 2 \hat{k}$ and $\overrightarrow{b} = \hat{i} + \hat{j}$. Let $\overrightarrow{c}$ be a vector such that $| \overrightarrow{c} - \overrightarrow{a} | = 3, \; |(\overrightarrow{a} \times \overrightarrow{b} ) \times \overrightarrow{c} |=3$ and the angle between $\overrightarrow{c}$ and $\overrightarrow{a} \times \overrightarrow{b} $ be $30^{\circ}$. The $\overrightarrow{a}.\overrightarrow{c}$ is equal to

asked Dec 11, 2018 by pady_1

1 answer

Radiation of wavelength $\lambda$, is incident on a photocell. The fastest emitted electron has speed $v$. If the wavelength is changed to $\frac{3λ}{4}$ , the speed of the fastest emitted electron will be :

asked Dec 11, 2018 by pady_1

0 answers

When current in a coil changes from $5\; A$ to $2\; A$ in $0.1 \;s$, an average voltage of $50\; V$ is produced. The self - inductance of the coil is :

asked Dec 11, 2018 by pady_1

0 answers

A pipe of length 85 cm is closed from one end. Find the number of possible natural oscillations of air column in the pipe whose frequencies lie below 1250 Hz. The velocity of sound in air is 340 m/s.

asked Dec 11, 2018 by pady_1

0 answers

The order of stability of the following carbocations : is

asked Dec 11, 2018 by pady_1

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Three numbers are chosen at random without replacement from $\{1, 2, 3, ....,8 \}$. The probability that their minimum is 3, given that their maximum is 6, is

asked Dec 11, 2018 by pady_1

0 answers

A Carnot engine operating between temperatures $T_1$ and $T_2$ has efficiency $\frac{1}{6}$. When $T_2$ is lowered by 62 $K$, its efficiency increases to $\frac{1}{3}$. Then $T_1$ and $T_2$ are, respectively :

asked Dec 11, 2018 by pady_1

0 answers

The correct sequence which shows decreasing order of the ionic radii of the elements is

asked Dec 11, 2018 by pady_1

0 answers

A long metallic bar is carrying heat from one of its end to the other end under steady-state. The variation of temperature $\theta$ along the length x of the bar from its hot end is best described by which of the following figure :

asked Nov 29, 2018 by pady_1

0 answers

In a shop there are five types of ice-creams available. A child buys six ice-creams. Statement -1: The number of different ways the child can buy the six ice-creams is $^{10}C_5$ Statement -2: The number of different ways the child can buy the six ice-creams is equal to the number of different ways of arranging 6 A’s and 4 B’s in a row.

asked Nov 29, 2018 by pady_1

0 answers

A value of C for which the conclusion of Mean Value Theorem holds for the function $f(x) = \log_e x $ on the interval $[1,3]$ is :

asked Nov 29, 2018 by pady_1

0 answers

The threshold frequeny for a metallic surface corresponds to an energy of 6.2 eV and the stopping potential for a radiation incident on this surface is 5V. The incident radiation lies in :

asked Nov 13, 2018 by pady_1

0 answers

The system of equations $\alpha x + y + z = \alpha -1$ $x + \alpha y + z = \alpha -1 $ $x + y + \alpha z = \alpha - 1$ has no solution, if $\alpha$ is :

asked Nov 5, 2018 by pady_1

0 answers

A body of mass m is accelerated uniform from rest to a speed $\nu$ in a time $T$. The instantaneous power delivered to the body as a function of time, is given by :

asked Nov 5, 2018 by pady_1

0 answers

Let $\alpha, \beta$ be such that $\pi - \alpha - \beta < 3 \pi$. If $\sin \alpha + \sin \beta = -\frac{21}{65}$ and $\cos \alpha + \cos \beta = -\frac{27}{65}$, then the value of $\cos \frac{\alpha - \beta}{2}$ is

asked Nov 5, 2018 by pady_1

0 answers

An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of

asked Aug 21, 2018 by pady_1

1 answer

Which is the incorrect statement ?

asked Aug 21, 2018 by pady_1

1 answer

The correct thermodynamic conditions for the spontaneous reaction at all temperatures is :

asked Aug 21, 2018 by pady_1

1 answer

Which of the following statements is not correct for a nucleophile?

asked Aug 21, 2018 by pady_1

1 answer

The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lies below 1250 Hz are: (velocity of sound = $340 \;ms^{-1}$)

asked Aug 20, 2018 by pady_1

1 answer

It we study the vibration of a pipe open at both ends, then the following statement is not true -

asked Aug 20, 2018 by pady_1

1 answer

A coil of resistance $400\Omega$ is placed in a magnetic filed. if the magnetic flux $\phi$ (wb) linked with the coil varies with times t(sec) as $\phi = 50 t^2 + 4.$ . The current is the coil at t = 2 sec is

asked Aug 20, 2018 by pady_1

1 answer

A current carrying closed loop in the form of a right angle isoceles triangle ABC is placed in a uniform magnetic field acting along AB. If the magnetic force on the arm BC is $\overrightarrow{F}$ , the force on the arm AC is :

asked Aug 16, 2018 by pady_1

2 answers

Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v and 2v at any instant, then the speed of centre of mass of the system will be –

asked Jul 26, 2018 by pady_1

1 answer

Which one of the following equations of motion represents simple harmonic motion ? Where $k,\; k_0,\; k_1$ and a are all positive

asked Jul 26, 2018 by pady_1

1 answer

On a new scale of temperature (which is linear) s and called the W scale, the freezing and boiling points of water are 39º W and 239º W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39ºC on the Celsius scale ?

asked Jul 26, 2018 by pady_1

1 answer

The electric and magnetic field of an electromagnetic wave are:-

asked Jul 26, 2018 by pady_1

1 answer

A forward biased diode is:-

asked Jul 25, 2018 by pady_1

1 answer

As a result of change in the magnetic flux linked to the closed loop shown in the figure, an e.m.f. V volt is induced in the loop. The work done (joules) in taking a charge Q coulomb once along the loop is

asked Jul 24, 2018 by pady_1

1 answer

The dimensions of universal gravitational constant are :-

asked Jul 24, 2018 by pady_1

1 answer

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

1 answer

Unit of Stefan's constant is : -

asked Jul 23, 2018 by pady_1

1 answer

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

asked Jul 20, 2018 by pady_1

1 answer

Motion of a particle is given by equation $S=({3t^3}+{7t^2}+14 t+8)m$ The value of acceleration of the particle at t = 1 sec. is :

asked Jul 20, 2018 by pady_1

1 answer

Work function of a metal surface is $\phi$ = 1.5 eV. If a light of wavelength 5000Å falls on it then the maximum K.E. of ejected electron will be -

asked Jun 15, 2018 by pady_1

1 answer

From the word 'POSTSCRIPT', how many independent words can be made without changing the order of the letters and using each letters only once?

asked Dec 31, 2015 by pady_1

1 answer

Dedra is planting flowers in her garden. She plants 3 flowers in the first row, 5 flowers in the second row, 8 flowers in the third row, and 12 flowers in the fourth row. If this pattern continues, how many flowers will Dedra plant in the fifth row?

asked Dec 31, 2015 by pady_1

0 answers

Find the breadth of a pathway whose area is 5000 sq m and length is 250 m.

asked Dec 31, 2015 by pady_1

0 answers

Following shape is made of several small cubes. What fraction of cubes are not visible in the picture shown below ?

asked Dec 31, 2015 by pady_1

1 answer

The cost of 11 pencils is Rs. 176. What will be the cost of 15 pencils ?

asked Dec 31, 2015 by pady_1

0 answers

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