Recent questions tagged 25

4d, 5d, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is :-

asked Jul 8, 2019 by pady_1

1 answer

In order that heat is conducted from one part of a solid to another part, what is required is ?

asked Dec 19, 2018 by pady_1

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For a perfect gas, if $\alpha, \; \beta$ are the volume and pressure coefficients of expansions, then :

asked Dec 19, 2018 by pady_1

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A body is thrown horizontally from the top of a tower of 5 m height. It touches the ground at a distance of 10 m from the foot of the tower. The initial velocity of the body is:

asked Dec 19, 2018 by pady_1

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A particle of mass $0.6 \;g$ and having charge of $25\;nC$ is moving horizontally with a uniform velocity $1.2 \times 10^4 \; ms^{-1}$ in a uniform magnetic field, then value of the magnetic induction is : $(g =10\; ms^{-2} )$

asked Dec 11, 2018 by pady_1

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Electromagnetic waves are transverse in nature is evident by :

asked Dec 11, 2018 by pady_1

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Three forces start acting simultaneously on a particle moving with velocity $\overrightarrow{v}$. These forces are represented in magnitude and direcction by the three sides of a triangle ABC (as shown). The particle will now move with velocity :

asked Dec 11, 2018 by pady_1

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The density of a material in the shape of a cube is determined by measuring three sides of the cube and its mass. If the relative errors in measuring the mass and length are respectively 1.5% and 1% the maximum error in determining the density is :

asked Dec 11, 2018 by pady_1

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The value of $(^{21} C_1 - ^{10}C_1) + (^{21}C_2 - ^{19}C_2) + (^{21}C_3 -^{10}C_3) + (^{21}C_4 - ^{10}C_4) +...+(^{21}C_{10} - ^{10}C_{10})$ is

asked Dec 11, 2018 by pady_1

1 answer

A screw gauge with a pitch of $0.5\; mm$ and a circular scale with $50$ divisions is used to measure the thickness of a thin sheet of Aluminium. Before starting the measurement, it is found that when the two jaws of the screw gauge are brought in contact, the 45th division coincides with the main scale line and that the zero of the main scale is barely visible. What is the thickness of the sheet if the main scale reading is $0.5\; mm$ and the $25^{th}$ division coincides with the main scale line ?

asked Dec 11, 2018 by pady_1

0 answers

A parallel beam of electrons travelling in $x$-direction falls on a slit of width $d$ (see figure). If after passing the slit, an electron acquires momentum $p_{_y}$ in the $y$-direction then for a majority of electrons passing through the slit ($h$ is Planck's constant) :

asked Dec 11, 2018 by pady_1

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The radiation corresponding to $3 \to 2$ transition of hydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of $3 \times 10^{-4} T$. If the radius of the largest circular path followed by these electrons is 10.0 mm, the work function of the metal is close to :

asked Dec 11, 2018 by pady_1

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Consider the following reaction : $xMnO_4^- + yC_2O_4^{2-} + zH^+ \rightarrow xMn^{2+} + 2yCO_2 + \frac{z}{2}H_2O$ The values of $x, y$ and $z$ in the reaction are, respectively :

asked Dec 11, 2018 by pady_1

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The length of the diameter of the circle which touches the x-axis at the point (1, 0) and passes through the point (2, 3) is

asked Dec 11, 2018 by pady_1

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Energy required for the electron excitation in $Li^{++}$ from the first to the third Bohr orbit is :

asked Dec 11, 2018 by pady_1

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Percentage of free space in cubic close packed structure and in body centred packed structure are respectively

asked Dec 11, 2018 by pady_1

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Two wires are made of the same material and have the same volume. However wire 1 has cross-sectional area A and wire-2 has cross-sectional area 3A. If the length of wire 1 increases by $\Delta$ x on applying force F, how much force is needed to stretch wire 2 by the same amount ?

asked Nov 29, 2018 by pady_1

0 answers

How many real solutions does the equation $X^7+14X^5+16X^3+30X-560=0$ have?

asked Nov 29, 2018 by pady_1

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If $\hat{u}$ and $\hat{v}$ are unit vectors and $\theta$ is the acute angle between them, then $ 2 \hat{u} \times 3 \hat{v}$ is a unit vector for :

asked Nov 29, 2018 by pady_1

0 answers

The current $I$ drawn from the 5 volt source will be :

asked Nov 13, 2018 by pady_1

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Let $f$ be differentiable for all $x$. If $f(1) = -2$ and $f'(x) \geq 2$ for $x \in [1,6]$, then :

asked Nov 5, 2018 by pady_1

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The change in the value of $g$ at a height $h$ above the surface of the earth is the same as at a depth $d$ below the surface of earth. When both $d$ and $h$ are much smaller than the radius of earth, then which one of the following is correct ?

asked Nov 5, 2018 by pady_1

0 answers

If $f : R \to S$, defined by $f(x) = \sin x - \sqrt{3} \cos x + 1$, is onto, then the interval of $S$ is

asked Nov 5, 2018 by pady_1

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An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is

asked Aug 21, 2018 by pady_1

1 answer

Which one is the wrong statement ?

asked Aug 21, 2018 by pady_1

1 answer

The product obtained as a result of a reaction of nitrogen with $CaC_2$ is

asked Aug 21, 2018 by pady_1

1 answer

20.0 g of magnesium carbonate sample decomposes on hating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample ?

asked Aug 21, 2018 by pady_1

1 answer

In a region the potential is represented by V(x, y, z) = 6x - 8xy - 8y + 6yz, where Vis in volts and x, y, z, are in meters. The electric force experienced by a charge of 2 coulomb situated at point (1, 1,1) is :

asked Aug 20, 2018 by pady_1

1 answer

A wire of resistance 4Ω is stretched to twice its original length. The resistance of stretched wire would be -

asked Aug 20, 2018 by pady_1

1 answer

If voltage across a bulb rated 220 Volts.- 100 Watt drops by 2.5% of its rated value the percentage of the rated value by which the power would decrease is

asked Aug 20, 2018 by pady_1

1 answer

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron :

asked Aug 16, 2018 by pady_1

1 answer

A tuning fork of frequency 512 Hz makes 4 beats per second with the vibrating string of a string of a piano. The beat frequency decreases to 2 beats per second, when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was –

asked Jul 26, 2018 by pady_1

1 answer

Three capacitors each of capacitance C and of breakdown voltage V are joined in series. The capacitance and breakdown voltage of the combination will be :

asked Jul 26, 2018 by pady_1

1 answer

Two points are located at a distance of 10 m and 15 m from the source of oscillation. The period of oscillation is 0.05 sec and the velocity of the wave is 300 m/s. What is the phase difference between the oscillations of two points ?

asked Jul 26, 2018 by pady_1

1 answer

Three point charges +q, –2q and +q are placed at points (x = 0, y = a, z = 0), (x = 0,y = 0, z = 0) and (x = a, y = 0, z = 0) respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are:-

asked Jul 26, 2018 by pady_1

1 answer

In a discharge tube ionization of enclosed gas produced due to collisions between:

asked Jul 25, 2018 by pady_1

1 answer

For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is -

asked Jul 24, 2018 by pady_1

1 answer

The equation of state for 5g of oxygen at a pressure P and temperature T, when occupying a volume V, will be :- Where is the gas constant.

asked Jul 24, 2018 by pady_1

1 answer

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The coulomb force $\overrightarrow{F}$ between the two is - (where $K = \frac{1}{4 \pi \varepsilon_0}$ )

asked Jul 24, 2018 by pady_1

1 answer

A point P consider at contact point of a wheel on ground which rolls on ground without sliping then value of displacement of point P when wheel completes half of rotation (If radius of wheel is 1m) : -

asked Jul 23, 2018 by pady_1

1 answer

Optical fibre are based on :-

asked Jul 20, 2018 by pady_1

0 answers

The value of quality factor is :

asked Jul 20, 2018 by pady_1

1 answer

If a ladder is not in balance against a smooth vertical wall, then it can be made in balance by :

asked Jun 15, 2018 by pady_1

1 answer

Rajesh’s school bus is facing North when reaches his school. After starting from Rajesh’s house, it turns twice right and then left before reaching the school. What direction the bus facing when it left the bus stop in front of Rajesh’s house?

asked Dec 31, 2015 by pady_1

1 answer

Marlon is writing a poem. He writes 22 words on the first line, 29 words on the second line, 36 words on the third line, and 43 words on the fourth line. If this pattern continues, how many words will Marlon write on the fifth line?

asked Dec 31, 2015 by pady_1

0 answers

Balvinder is reading a story book and this book has 329 pages. Balvinder manages to read \large\frac{1}{47} of the book every day. After 2 days, how many pages does he have left to read?

asked Dec 31, 2015 by pady_1

0 answers

Divide $\large\frac{2}{3}$ by $\large\frac{1}{3}$

asked Dec 31, 2015 by pady_1

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Jaya weight 60 kg. Her brother weights 20 \% more. What is the weight of her brother?

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

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