Recent questions tagged 24

Identify the incorrect statement related to $PCl_5$ from the following :-

asked Jul 8, 2019 by pady_1

1 answer

A lead bullet of mass 21g travelling at a speed of $100 \; m/s$ comes to rest in a wooden block. If no heat is taken away by the wood, the rise in temperature of the bullet in the wood nearly is (sp. heat of lead = $30 cal/kg^{\circ}C $) :

asked Dec 19, 2018 by pady_1

0 answers

If on heating liquid through $80^{\circ}C$, the mass expelled is $\begin{pmatrix} \frac{1}{100} \end{pmatrix}^{th}$ of mass still remaining, the coefficient of apparent expansion of liquid is :

asked Dec 19, 2018 by pady_1

0 answers

A body is thrown vertically upwards with an initial velocity $u$ reaches maximum height in $6\;sec$. The ratio of distance travelled by the body in the first and seventh second is :

asked Dec 19, 2018 by pady_1

0 answers

If a change in current of $0.01 \;A$ in one coil produces a change in magnetic flux of $2 \times10^{-2} Wb$ in the other coil, then the mutual inductance of the two coils in henry is :

asked Dec 11, 2018 by pady_1

0 answers

At absolute zero, Si acts as :

asked Dec 11, 2018 by pady_1

0 answers

The physical quantities not having same dimensions are :

asked Dec 11, 2018 by pady_1

0 answers

The dipole moment of a circular loop carrying a current I, is m and the magnetic field at the centre of the loop is $B_t$. When the dipole moment is double by keeping the current constant, the magnetic field at the centre of loop is $B_z$. The ratio $\frac{B_1}{B_2}$ is:

asked Dec 11, 2018 by pady_1

0 answers

A man X has 7 friends, 4 of them are ladies and 3 are men. His wife Y also has 7 friends, 3 of them are ladies and 4 are men. Assume X and Y have no common friends. Then the total number of ways in which X and Y together can throw a party inviting 3 ladies and 3 men, so that 3 friends of each of X and Y are in this party, is

asked Dec 11, 2018 by pady_1

1 answer

Choose the correct statement :

asked Dec 11, 2018 by pady_1

0 answers

You are asked to design a shaving mirror assuming that a person keeps it 10 cm from his face and views the magnified image of the face at the closest comfortable distance of 25 cm. The radius of curvature of the mirror would then be :

asked Dec 11, 2018 by pady_1

0 answers

Hydrogen $(_1H^1 )$, Deuterium $(_1H^2 )$, singly ionised Helium $(_2He^4 )^+$ and doubly ionised lithium $(_3Li^6 )^{++}$ all have one electron around the nucleus. Consider an electron transition from n = 2 to n = 1. If the wave lengths of emitted radiation are $\lambda_1, \lambda_2, \lambda_3 \;and \;\lambda_4$ respectively then approximately which one of the following is correct?

asked Dec 11, 2018 by pady_1

0 answers

The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was :

asked Dec 11, 2018 by pady_1

0 answers

If $\begin{align}g(x) = \int_0^x \cos \; 4t \; dt \end{align}$, then $g(x+ \pi)$ equals

asked Dec 11, 2018 by pady_1

0 answers

A car is fitted with a convex side-view mirror of focal length 20 cm. A second car 2.8 m behind the first car is overtaking the first car at relative speed of 15 m/s. The speed of the image of the second car as seen in the mirror of the first one is :

asked Dec 11, 2018 by pady_1

0 answers

At $25^{\circ}C$, the solubility product of $Mg(OH)_2$ is $1.0 \times 10^{–11}$. At which $pH$, will $Mg^{2+}$ ions start precipitating in the form of $Mg(OH)_2$ from a solution of $0.001\; M \;Mg^{2+}$ ions ?

asked Dec 11, 2018 by pady_1

0 answers

The height at which the acceleration due to gravity becomes $\frac{g}{9}$ (where g = the acceleration due to gravity on the surace of the earth) in terms of R, the radius of the earth is

asked Nov 29, 2018 by pady_1

1 answer

Suppose the cube $x^3 - px + q$ has three distinct real roots where p > 0 and q > 0. Then which one of the following holds?

asked Nov 29, 2018 by pady_1

0 answers

The sum of the series $\frac{1}{2!} - \frac{1}{3!} + \frac{1}{4!} - ...$ upto infinity is :

asked Nov 29, 2018 by pady_1

0 answers

When $_3 Li^7$ nuclei are bombarded by protons, and the resultant nuclei are $_4Be^8$, the emitted particles will be :

asked Nov 13, 2018 by pady_1

0 answers

Suppose $f(x)$ is differentiable at $x=1$ and $ \displaystyle \lim_{h \to 0} \frac{1}{h} f(1+h) =5 $, then $f'(1)$ equals :

asked Nov 5, 2018 by pady_1

0 answers

A $T$ shaped object with dimensions shown in figure, is lying on a smooth floor. A force $\overrightarrow{F}$ is applied at the point $P$ parallel to $AB$, such that the object has only the translational motion without rotation. Find the location of $P$ with respect to $C$:

asked Nov 5, 2018 by pady_1

0 answers

A person standing on the bank of a river observes that the angle of elevation of the top of a tree on the opposite bank of the river is $60^{\circ}$ and when he retires $40$ meter away from the tree the angle of elevation becomes $30^{\circ}$. The breadth of the river is

asked Nov 5, 2018 by pady_1

0 answers

The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is

asked Aug 21, 2018 by pady_1

1 answer

An example of a sigma bonded organometallic compound is-

asked Aug 21, 2018 by pady_1

1 answer

Which of the following reagents would distinguish cis-cyclopenta-1, 2-diol from the trans-isomer ?

asked Aug 21, 2018 by pady_1

1 answer

The heat of combustion of carbon to $CO_2$ is $–393.5\; kJ/mol$. The heat released upon formation of $35.2 \;g$ of $CO_2$ from carbon and oxygen gas is -

asked Aug 21, 2018 by pady_1

1 answer

A conducting sphere of radius R is given a charge Q. The electric potential and the electric field at the centre of the sphere respectively are:

asked Aug 20, 2018 by pady_1

2 answers

A, B and C are three points in a uniform electric field. The electric potential is -

asked Aug 20, 2018 by pady_1

1 answer

A ring is made of a wire having a resistance $R_0 = 12\Omega$ . Find the points A and B, as shown in the figure, at which a current carrying conductor should be connected so that the resistance R of the sub circuit between these points is equal to $\frac{8}{3}\Omega$ :

asked Aug 20, 2018 by pady_1

1 answer

The electric and the magnetic field, assiociated with an e.m wave, propagating along the +z - axis, can be represented by :

asked Aug 16, 2018 by pady_1

1 answer

A potentiometer circuit is set up as shown. The potential gradient across the potentiometer wire, is k volt/cm and the ammeter, present in the circuit, reads 1.0 A when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1 and 3, is plugged in, are found to be at lengths $l_1$cm and $l_2$ cm respectively. The magnitudes, of the resistors R and X, in ohms, are then, equal respectively to

asked Jul 26, 2018 by pady_1

1 answer

Each of the two strings of length 51.6 cm and 49.1 cm are tensioned separately by 20 N force. Mass per unit length of both the strings is same and equal to 1 g/m. When both the strings vibrate simultaneously the number of beats is :

asked Jul 26, 2018 by pady_1

1 answer

The velocity of electromagnetic radiation in a medium of permittivity $\epsilon_0$ and permeability $\mu_0$ is given by :

asked Jul 26, 2018 by pady_1

1 answer

A hollow cylinder has a charge q coulomb within it. If $\phi$ is the electric flux in units of voltmeter associated with the curved surface B, the flux linked with the plane surface A in units of voltmeter will be- <img src =""/>

asked Jul 26, 2018 by pady_1

1 answer

Two coils of self inductances 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is:

asked Jul 25, 2018 by pady_1

1 answer

If ${\lambda v}>{\lambda x}>{\lambda m}$ represent the wavelengths of visible light, x-rays and microwaves respectively, then-

asked Jul 24, 2018 by pady_1

1 answer

A bullet of mass 2 g is having a charge of 2 µC. Through what potential difference must it be accelerated, starting from rest, to acquire a speed of 10 m/s ?

asked Jul 24, 2018 by pady_1

1 answer

A charge q is located at the centre of a cube. The electric flux through any face is -

asked Jul 24, 2018 by pady_1

1 answer

A body of mass m is placed on earth surface which is taken from earth surface to a height of h = 3R then change in gravitational potential energy is : -

asked Jul 23, 2018 by pady_1

1 answer

If $|\overrightarrow{A}+\overrightarrow{B}| = |\overrightarrow{A} | = |\overrightarrow{B}| $ then angle between A and B will be :-

asked Jul 20, 2018 by pady_1

1 answer

A charge having q/m equal to $10^8$ c/kg and with velocity $3 × 10^5$ m/s enters into a uniform magnetic field $B = 0.3$ tesla at an angle $30^{\circ}$ with direction of field. Then radius of curvature will be :

asked Jul 20, 2018 by pady_1

1 answer

Resistance of a Galvanometer coil is 8$\Omega$ and 2$\Omega$ Shunt resistance is connected with it. If main current is 1 A then the current flow through 2$\Omega$ resistance will be :

asked Jun 15, 2018 by pady_1

1 answer

A man walks 6 km to the east and then turn to the south 2 km. Again he turns to the east and walks 2 km. Next he turns northwards and walks 8 km. How far is he now from his starting point?

asked Dec 31, 2015 by pady_1

1 answer

A survey was done at Amitys school to find how students come to school. Result of survey is shown in the circle chart. , Which is the least preferred transport for coming to school ?

asked Dec 31, 2015 by pady_1

0 answers

Each bag of bananas weighs 3.39 kgs. If the total weight of a sack containing bananas bags is 74.58 kgs, then how many bags are in the sack?

asked Dec 31, 2015 by pady_1

0 answers

Which of the following is the mixed fraction equivalent of $\large\frac{91}{6}$

asked Dec 31, 2015 by pady_1

0 answers

The yearly rent of the house is Rs. 240000. If George wants to rent the house for only 2 months, how much rent will he pay for 2 months?

asked Dec 31, 2015 by pady_1

0 answers

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