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Recent questions tagged 12

The correct order of the basic strength of methyl substituted amines in aqueous solution is :-

asked Jul 8, 2019 by pady_1

1 answer

How is 'mutation' explained by Hugo de Vries different from the Darwinian variations?

asked Apr 13, 2019 by priyanka.clay6

1 answer

Categorise the following pairs of examples as convergent or divergent evolutions : <br>a. Eyes of Octopus and mammals. <br>b. Wings of butterfly and birds. <br> c. Tuber of sweet potatoes and potato. <br> d. Thorns in Bougainvillea and tendrils in Cucurbits.

asked Apr 13, 2019 by priyanka.clay6

1 answer

Mention the green house gases and their proportion in the pie diagram given below.

asked Apr 11, 2019 by priyanka.clay6

1 answer

State Brewster's law

asked Mar 21, 2019 by meena.clay6

1 answer

Ohm's law is true

asked Mar 20, 2019 by meena.clay6

1 answer

If 5 percent of total current passes through a galvanometer of resistance G, then value of sheet resistance s is

asked Mar 20, 2019 by meena.clay6

1 answer

From Joules law of heating when current I flows through G. resistance R for time t. then Q produced is

asked Mar 20, 2019 by meena.clay6

1 answer

Kirchhoff's current law for a junction as shown

asked Mar 20, 2019 by meena.clay6

1 answer

n identical cells each of E and internal resistance r be connected in services The current through load resistance R

asked Mar 20, 2019 by meena.clay6

1 answer

Value of g :

asked Dec 19, 2018 by pady_1

0 answers

Bullets of $0.03\; kg$ mass each, hit a plate at the rate of $200$ bullets per second, with a velocity of $50\;ms^{-1}$ and reflect back with a velocity of $30\;ms^{-1}$. The average force acting on the plate, in newtons, is :

asked Dec 19, 2018 by pady_1

0 answers

Two electric charges $12 \mu C$ and $-6 \mu C$ are placed $20\;cm$ apart in air, there will be a point $P$ at which electric potential is zero on the line joining these two charges and out side excluding the region between them. The distance of $P$ from $-6 \mu C$ charge is :

asked Dec 19, 2018 by pady_1

0 answers

One face of the glass prism is silver polished. A light ray falls at an angle of $45^{\circ}$ on the other face. After reflection it is subsequently reflected from the silvered face and then retraces its path. The refracting angle of prism is $30^{\circ}$. The refractive index of the prism is :

asked Dec 11, 2018 by pady_1

0 answers

A tuning fork arrangement (pair) produces 4 beats/s with one fork of frequency 288 cps. A little wax is placed on the unknown fork and it then produces 2 beats/s. The frequency of the unknown fork is :

asked Dec 11, 2018 by pady_1

0 answers

The negative $Zn$ pole of Daniell cell, sending a constant current through a circuit, decreases in mass by $0.13\;g$ in $30$ minutes. If the electrochemical equivalent of $Zn$ and $Cu$ are $32.5$ and $31.5$ respectively, the increase in the mass of the positive $Cu$ pole in this time is :

asked Dec 11, 2018 by pady_1

0 answers

A parallel plate capacitor of capacitance $90\; pF$ is connected to a battery of emf $20V$. If a dielectric material of dielectric constant $K = \frac{5}{3}$ is inserted between the plates, the magnitude of the induced charge will be :

asked Dec 11, 2018 by pady_1

0 answers

A vertical tower AB have its end A on the level ground. Let C be the mid-point of AB and P be a point on the ground such that $AP = 2 AB$. If $\angle{BPC} = \beta$, then $\tan \beta$ is equal to

asked Dec 11, 2018 by pady_1

1 answer

The region between two concentric spheres of radii â€˜aâ€™ and â€˜bâ€™, respectively (see figure), has volume charge density $\rho = \frac{A}{r}$ , where A is a constant and r is the distance from the centre. At the centre of the spheres is a point charge Q. The value of A such that the electric field in the region between the spheres will be constant, is : <br>

asked Dec 11, 2018 by pady_1

0 answers

A simple harmonic oscillator of angular frequency $2\; rad\; s^{-1}$ is acted upon by an external force $F = \sin t\; N$. If the oscillator is at rest in its equilibrium position at $t=0$, its position at later times is proportional to :

asked Dec 11, 2018 by pady_1

0 answers

The coercivity of a small magnet where the ferromagnet gets demagnetized is $3 \times 10^3 Am^{-1}$ . The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid, is:

asked Dec 11, 2018 by pady_1

0 answers

Experimentally it was found that a metal oxide has formula $M_{0.98}O$. Metal M, is present as $M^{2+}$ and $M^{3+}$ in its oxide. Fraction of the metal which exists as $M^{3+}$ would be :

asked Dec 11, 2018 by pady_1

0 answers

An equation of a plane parallel to the plane $ x - 2y + 2z - 5 = 0 $ and at a unit distance from the origin is

asked Dec 11, 2018 by pady_1

0 answers

Let the $x-z$ plane be the boundary between two transparent media. Medium 1 in $z \geq 0$ has a refractive index of $\sqrt{2}$ and medium 2 with $z < 0$ has a refractive index of $\sqrt{3}$. A ray of light in medium 1 given by the vector $\overrightarrow{A} = 6\sqrt{3} \hat{i} + 8 \sqrt{3} \hat{j} - 10 \hat{k}$ is incident on the plane of separation. The angle of refraction in medium 2 is

asked Dec 11, 2018 by pady_1

0 answers

Ionisation energy of $He^{+}$ is $19.6 \times 10^{–18}\; J \;atom^{–1}.$ The energy of the first stationary state $(n = 1)$ of $Li^{2+}$ is

asked Dec 11, 2018 by pady_1

0 answers

The magnitude of the magnetic field (B) due to loop ABCD at the origin (O) is

asked Nov 29, 2018 by pady_1

0 answers

The mean of the numbers a, b, 8, 5, 10 is 6 and the variance is 6.80. Then which one of the following gives possible values of a and b?

asked Nov 29, 2018 by pady_1

0 answers

A tower stands at the centre of a circular park. A and B are two points on the boundary of the park such that AB (=a) subtends an angle of $60^{\circ}$ at the foot of the tower and the angle of elevation of the top of the tower from A or B is $30^{\circ}$. The height of the tower is :

asked Nov 29, 2018 by pady_1

0 answers

Starting from the origin a body oscillates simple harmonically with a period of 2 s. After what time will its kinetic energy be 75% of the total energy ?

asked Nov 13, 2018 by pady_1

0 answers

In a triangle PQR, $\angle{R} = \frac{\pi}{2}$. If $\tan (\frac{P}{2})$ and $\tan (\frac{Q}{2})$ are the roots of $ax^2 + bx + c = 0, a \neq 0$, then :

asked Nov 5, 2018 by pady_1

0 answers

A spherical ball of mass 20 kg is stationary at the top of a hill of height 100 m. It rolls down a smooth surface to the ground, then climbs up another hill of height 30 m and finally rolls down to a horizontal base at a height of 20 m above the ground. The velocity attained by the ball is :

asked Nov 5, 2018 by pady_1

0 answers

Hoe many ways are there to arrange the letters in the worf GARDEN with the vowels in alphabetical order ?

asked Nov 5, 2018 by pady_1

0 answers

An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be :

asked Aug 21, 2018 by pady_1

1 answer

Which of the following is sink for CO?

asked Aug 21, 2018 by pady_1

1 answer

Match the compounds given in column I with the hybridisation and shape given in column II and mark the correct option. <br>

asked Aug 21, 2018 by pady_1

1 answer

The number of water molecules is maximum in :

asked Aug 21, 2018 by pady_1

1 answer

Dependence of intensity of gravitational field (E) of earth with distance (r) from centre of earth is correctly represented by :

asked Aug 20, 2018 by pady_1

1 answer

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?

asked Aug 20, 2018 by pady_1

1 answer

A spherical planet has a mass $M_P$ and diameter $D_P$. A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity, equal to

asked Aug 20, 2018 by pady_1

1 answer

A body is moving with velocity 30 m/s towards east. After 10 seconds its velocity becomes 40 m/s towards north. The average acceleration of the body is :

asked Aug 16, 2018 by pady_1

1 answer

A ball moving with velocity 2m/s collides head on with another stationary ball of double the mass. If the coefficient of restitution is 0.5, th their velocities (in m/s) after collision will be –

asked Jul 26, 2018 by pady_1

1 answer

The figure shows elliptical orbit of a planet m about the sun S. The shaded area SCD is twice the shaded are SAB. It $t_1$ is the time for the planet to move from C to D and $t_2$ is the time to move from A to B then

asked Jul 26, 2018 by pady_1

1 answer

An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature $20^oC$ ? The temperature of boiling water is $100^oC$.

asked Jul 26, 2018 by pady_1

1 answer

A uniform rod AB of length $l$ and mass $m$ is free to rotate about point $A$. The rod is released from rest in the horizontal position. Given that the moment of inertia of the rod about $A$ is $\frac{ml^2}{3}$,the initial angular acceleration of the rod will be <br> <img src =" "/>

asked Jul 26, 2018 by pady_1

2 answers

Ionization potential of hydrogen atom is 13.6eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emitted by hydrogen will be:-

asked Jul 25, 2018 by pady_1

1 answer

If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by $\mu_d, \mu_p$ and $\mu_f$ respectively, then

asked Jul 24, 2018 by pady_1

0 answers

A particle of mass $m_1$ is moving with a velocity $v_1$ and another particle of mass $m_2$ is moving with a velocity $v_2$. Both of them have the same momentum but their different kinetic energies are $E_1$ and $E_2$ respectively. If $m_1$ > $m_2$ then :

asked Jul 24, 2018 by pady_1

1 answer

Two spheres of masses m and M are situated in air and the gravitational force between them is F. The space around the masses in now filled with a liquid of specific density 3. The gravitational force will now be :

asked Jul 24, 2018 by pady_1

2 answers

Which of the following is not the property of cathode rays : -

asked Jul 23, 2018 by pady_1

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 : -

asked Jul 20, 2018 by pady_1

1 answer

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