Recent questions tagged 34

The mixture that forms maximum boiling azeotrope is :

asked Jul 8, 2019 by pady_1

1 answer

Diamagnetic substance are :

asked Dec 19, 2018 by pady_1

0 answers

In a Huygen's eye piece, with an eye piece of focal length F, the distance between the eye piece and field lens should be :

asked Dec 19, 2018 by pady_1

0 answers

$R$ and $r$ are the radii of the earth and moon respectively, $\rho_e$ and $\rho_m$ are densities of earth and moon respectively . The ratio of the acceleration due to gravity on the surfaces of the moon and earth, is :

asked Dec 19, 2018 by pady_1

0 answers

A particle falls from a height 'h' upon a fixed horizontal plane and rebounds. If 'e' is the coefficient of restitution, the total distance travelled before rebound-ing has stopped is :

asked Dec 11, 2018 by pady_1

0 answers

If there are $n$ capacitors in parallel connected to $V$ volt source, then the energy stored is equal to :

asked Dec 11, 2018 by pady_1

0 answers

The escape velocity for a body projected vertically upwards from the surface of earth is $11\; km/s$. If the body is projected at an angle of $45^{\circ}$ with the vertical, the escape velocity will be :

asked Dec 11, 2018 by pady_1

0 answers

Tangents are drawn to the hyperbola $4x^2 - y^2 = 36$ at the points P and Q. If these tangents intersect at the point $T(0,3)$ then the area (in sq. units) of $\Delta PTQ$ is :

asked Dec 11, 2018 by pady_1

1 answer

The moment of inertia of a uniform cylinder of length $l$ and radius $R$ about its perpendicular bisector is $I$. What is the ratio $l/R$ such that the moment of inertia is minimum ?

asked Dec 11, 2018 by pady_1

0 answers

The species in which the N atom is in a state of sp hybridization is :

asked Dec 11, 2018 by pady_1

0 answers

After understanding the assertion and reason, choose the correct option. <br> Assertion : In the bonding molecular orbital (MO) of $H_2$ , electron density is increased between the nuclei. <br> Reason : The bonding MO is $\Psi_A + \Psi_B$ , which shows destructive interference of the combining electron waves

asked Dec 11, 2018 by pady_1

0 answers

If $[ \overrightarrow{a} \times \overrightarrow{b} \; \overrightarrow{ b} \times \overrightarrow{c } \; \overrightarrow{c} \times \overrightarrow{a} ] = \lambda [ \overrightarrow{a} \; \overrightarrow{b} \; \overrightarrow{c} ]^2$ , then $\lambda$ is equal to

asked Dec 11, 2018 by pady_1

1 answer

A ray of light along $x + \sqrt{3}y = \sqrt{3}$ gets reflected upon reaching x-axis , the equation of the reflected rays is

asked Dec 11, 2018 by pady_1

1 answer

An electromagnetic wave in vacuum has the electric and magnetic fields $\overrightarrow{E}$ and $\overrightarrow{B}$, which are always perpendicular to each other. The direction of polarization is given by $\overrightarrow{X}$ and that of wave propagation by $\overrightarrow{k}$. Then :

asked Dec 11, 2018 by pady_1

0 answers

$ \displaystyle{\lim_{x \to 2} ( \frac{\sqrt{1-\cos \{ 2 (x-2) \} }}{x-2} } )$

asked Dec 11, 2018 by pady_1

0 answers

Statement-1 : When ultraviolet light is incident on a photocell, its stopping potential is $V_0$ and the maximum kinetic energy of the photoelectrons is $K_{max}$. When the ultraviolet light is replaced by X- rays, both V0 and Kmax increase. Statement-2 : Photoelectrons are emitted with speeds ranging from zero to a maximum value because of the range of frequencies present in the incident light.

asked Dec 11, 2018 by pady_1

0 answers

The alkene that exhibits geometrical isomerism is :

asked Nov 29, 2018 by pady_1

0 answers

27. Let A be a square matrix all of whose entries are integers. Then which one of the following is true?

asked Nov 29, 2018 by pady_1

0 answers

Let $F(x) = f(x) + f (\frac{1}{x}), f(x) = \int_1^x \frac{ \log t}{1 + t} dt$. Then $F(e)$ equals :

asked Nov 29, 2018 by pady_1

0 answers

In a Wheatstone's bridge, three resistances P, Q and R are connected in the three arms and the fourth arm is formed by two resistances $S_1$ and $S_2$ connected in parallel. The condition for the bridge to be balanced will be :

asked Nov 13, 2018 by pady_1

0 answers

Let $\alpha$ and $\beta$ be the distinct roots of $ax^2 + bx + c = 0 $, then $\displaystyle{\lim_{x \to \alpha} \frac{1- \cos (ax^2 + bx + c)}{(x-\alpha)^2}}$ is equal to :

asked Nov 5, 2018 by pady_1

0 answers

The figure shows a system of two concentric spheres of radii $r_1$ and $r_2$ and kept at temperature $T_1$ and $T_2$, respectively. The radical rate of flow of heat in a substance between the two concentric spheres, is proportional to : <br>

asked Nov 5, 2018 by pady_1

0 answers

If $2a + 3b + 6c = 0$, then at least one root of the equation $ax^2 + bx +c =0$ lies in the interval

asked Nov 5, 2018 by pady_1

0 answers

Which one of the following statements is incorrect ?

asked Aug 21, 2018 by pady_1

1 answer

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of $Co^{3+}$ is -

asked Aug 21, 2018 by pady_1

1 answer

$MY$ and $NY_3$, two nearly insoluble salts, have the same KSP values of $6.2 \times 10^{–13}$ at room temperature. Which statement would be true in regard to $MY$ and $NY_3$ ?

asked Aug 21, 2018 by pady_1

1 answer

In an $S_N1$ reaction on chiral centres, there is -

asked Aug 21, 2018 by pady_1

1 answer

Light with an energy flux of $25 \times 10^4\; wm^{-2}$ falls on a perfectly reflecting surface at normal incidence. If the surface area is $15\; cm^2$ , the average force exerted on the surface is:

asked Aug 20, 2018 by pady_1

1 answer

Ratio of longest wave lengths corresponding to Lyman and Balmer series in hydrogen spectrum is -

asked Aug 20, 2018 by pady_1

1 answer

An alternating electric field, of frequency v, is applied across the dees (radius = R) of a cyclotron that is being used to accelerated protons (mass = m). The operating magnetic field (B) used in the cyclotron and the kinetic energy (K) of the proton beam, produced by it, are given by

asked Aug 20, 2018 by pady_1

1 answer

Sound waves travel at $350 m/s$ through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from wave air :

asked Aug 16, 2018 by pady_1

1 answer

An alpha nucleus of energy $\frac{1}{2} mv^2$ bombards a 2 heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to –

asked Jul 26, 2018 by pady_1

1 answer

Power dissipated in an LCR series circuit connected to an a.c. source of emf ? is : 2

asked Jul 26, 2018 by pady_1

1 answer

Which two of the following five physical parameters have the same dimensions ? <br> (a) Energy density (b) Refractive index (c) Dielectric constant (d) Young’s modulus (e) Magnetic field

asked Jul 26, 2018 by pady_1

1 answer

A beam of electrons passes undeflected through mutually perpendicular electric and magnetic fields. It the electric field is switched off, and the same magnetic field is maintained, the electrons move :

asked Jul 26, 2018 by pady_1

1 answer

The Earth is assumed to be a sphere of radius R. A platform is arranged at a height R from the surface of the Earth. The escape velocity of a body from this platform is fv, where v is its escape velocity from the surface of the Earth. The value of f is:-

asked Jul 25, 2018 by pady_1

1 answer

A stone tied to the end of a string of 1 m long is whirled in a horizontal circle with a constant speed. If the stone makes 22 revolution in 44 seconds, what is the magnitude and direction of acceleration of the stone-

asked Jul 24, 2018 by pady_1

2 answers

A block of mass m is placed on a smooth wedge of inclination $\theta$. The whole system is accelerated horizontally so that the block does not slip on th wedge. The force exerted by the wedge on the block (g is acceleration due to gravity) will be :-

asked Jul 24, 2018 by pady_1

1 answer

Fuse wire is a wire of

asked Jul 24, 2018 by pady_1

1 answer

In a PN junction : -

asked Jul 23, 2018 by pady_1

0 answers

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 :-

asked Jul 20, 2018 by pady_1

1 answer

If $\overrightarrow{F}$ = $(60 \hat{i} + 15 \hat{j} – 3 \hat{k} ) N $ and $\overrightarrow{V }= (2 \hat{i} – 4\hat{j} + 5 \hat{k} ) m/s$, then instantaneous power is :

asked Jul 20, 2018 by pady_1

0 answers

If the frequency of a spring is n after suspending mass M, now 4M mass is suspended from spring then the frequency will be :

asked Jun 15, 2018 by pady_1

1 answer

Vincent unpacked 31 kilograms of pineapples and apples. The pineapples came in 8-kilogram bags and the apples came in 7-kilogram bags. In all, Vincent unpacked 4 bags of fruit. How many bags of pineapples and bags of apples did he unpack?

asked Dec 31, 2015 by pady_1

1 answer

What is the total length of the pole in centimeters if 30 cm is buried in the ground?

asked Dec 31, 2015 by pady_1

0 answers

$4\large\frac{1}{2}$ of 3

asked Dec 31, 2015 by pady_1

0 answers

What % is 250 of 1200?

asked Dec 31, 2015 by pady_1

0 answers

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