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Recent questions tagged easy

Two plane mirrors are inclined to each other at some angle. A ray of light incident at $30^{\circ}$ on one mirror after reflection from the other mirror retracts its path. The angle between the mirror is :

asked Jan 15, 2014 by meena.p

1 answer

In a probability distribution of a random variable X, the sum of probability is always

asked Jan 15, 2014 by thanvigandhi_1

1 answer

A ray of light is reflected by two plane mirror mutually at right angles to each other. What is the deviation of reflected ray from the incident ray

asked Jan 15, 2014 by meena.p

1 answer

A ray of light is incident at an angle of $20^{\circ}$ to the normal. What is the deviation caused due to reflection?

asked Jan 15, 2014 by meena.p

1 answer

A man is walking towards the plane mirror at the speed of $4 km/hr$ . What is the speed with which he is approaching his image?

asked Jan 15, 2014 by meena.p

1 answer

Two plane mirrors are inclined to each other in such a way that a ray of light moving parallel to one mirror comes out parallel to the other mirror after two reflections. The angle between the mirrors is :

asked Jan 15, 2014 by meena.p

1 answer

A ray of light is incident at $30^{\circ} $ on the plane mirror. What is the angle between mirror and reflected ray ?

asked Jan 15, 2014 by meena.p

1 answer

The volume of a parallelopiped formed by $\hat i+a\hat j+\hat k,\:\hat j+a\hat k\:and\:\:a\hat i+\hat k$ is minimum if $a=?$

asked Jan 13, 2014 by rvidyagovindarajan_1

1 answer

If $\overrightarrow u=\hat i+\hat j,\:\overrightarrow v=\hat i-\hat j\:and\:\overrightarrow w=\hat i+2\hat j+3\hat k$ and $\overrightarrow n$ is a unit vector such that $\overrightarrow n.\overrightarrow u=\overrightarrow n.\overrightarrow v=0$, then $|\overrightarrow n.\overrightarrow w|=?$

asked Jan 13, 2014 by rvidyagovindarajan_1

1 answer

Which of the following sets of quantum numbers represents the highest energy of an atom?

asked Jan 13, 2014 by sreemathi.v

1 answer

Which one of the following sets of ions represents a collection of isoelectronic species?

asked Jan 13, 2014 by sreemathi.v

1 answer

Which of the following statement is correct in relation to the hydrogen atom?

asked Jan 13, 2014 by sreemathi.v

1 answer

In a multi-electron atom,which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic field.\[\] $\begin{array}{1 1}(i)\;n=1,l=0,m=0\\(ii)\;n=2,l=0,m=0\\(iii)\;n=2,l=1,m=1\\(iv)\;n=3,l=2,m=1\\(v)\;n=3,l=2,m=0\end{array}$

asked Jan 13, 2014 by sreemathi.v

1 answer

Of the following outer electronic configurations of atoms,the highest oxidation state is achieved by which one of them

asked Jan 13, 2014 by sreemathi.v

1 answer

The number of electrons with the azimuthal quantum number $l=1$ 1nd $l=2$ in ground state of $_{24}Cr$ is respectively :

asked Jan 13, 2014 by sreemathi.v

1 answer

Which set is correct for an electron in $4f-$orbital?

asked Jan 13, 2014 by sreemathi.v

1 answer

The De-Brogile wavelength of a tennis ball mass 60g moving with a velocity of 10m per second is approximately

asked Jan 13, 2014 by sreemathi.v

1 answer

In Bohr series of lines of hydrogen spectrum,third line from the red end corresponds to which one of the following inner orbit jumps of electron of Bohr orbit in atom of hydrogen

asked Jan 13, 2014 by sreemathi.v

1 answer

The orbital angular momentum for an electron resolving in an orbit is $\large\frac{h}{2\pi}$$\sqrt{l(l+1)}$.This momentum of a $s$-electron is :

asked Jan 13, 2014 by sreemathi.v

1 answer

The number of d-electrons retained in $Fe^{2+}$ ion is :

asked Jan 13, 2014 by sreemathi.v

1 answer

Which has the maximum magnetic moment

asked Jan 13, 2014 by sreemathi.v

1 answer

Uncertainty in position of a minute particle of mass 25g in space is $10^{-5}$m.The uncertainty in its velocity (in $ms^{-1})$ is

asked Jan 13, 2014 by sreemathi.v

1 answer

In a hydrogen atom,if energy of an electron in ground state is -13.6eV,then that in the $2^{nd}$ excited state is :

asked Jan 13, 2014 by sreemathi.v

1 answer

The quantum number that does not describe the distance and the angular disposition of the electron

asked Jan 13, 2014 by sreemathi.v

1 answer

Kcrypon ($36_Kr)$ has the electronic configuration $(_{18}Ar)4s^23d^{10}4p^6$,the $37^{th}$ electron will go into which of the following subshells?

asked Jan 13, 2014 by sreemathi.v

1 answer

The electronic configuration $1s^2,2s^2p^6,3s^13p^1$ correctly describes :

asked Jan 13, 2014 by sreemathi.v

1 answer

An ion with 18 electrons in the outermost shell is :

asked Jan 13, 2014 by sreemathi.v

1 answer

Among the following series of transition metals ions,the one where all metal ions have $3d^2$ electronic configuration is

asked Jan 13, 2014 by sreemathi.v

1 answer

If $A(4,7,8),\:B(2,3,4),\:C(2,5,7)$ are vertices of a triangle then the length of internal bisector of angle $A$ is ?

asked Jan 12, 2014 by rvidyagovindarajan_1

1 answer

Find the angle between any two diagonals of a cube.

asked Jan 12, 2014 by rvidyagovindarajan_1

1 answer

The cosine of angle between the medians drawn from vertices of isosceles rt. angled triangle is?

asked Jan 12, 2014 by rvidyagovindarajan_1

1 answer

If from a point $P(a,b,c)$ perpendiculars $PA,\:PB,\:$ are drawn on $yz\:\:and\:\:zx$ planes. then the equation of the plane $OAB$ is ?

asked Jan 11, 2014 by rvidyagovindarajan_1

1 answer

If the vertices of a triangle are $A(1,4,2),\:B(-2,1,2)\:C(2,-3,4)$ then the angle $B$ = ?

asked Jan 11, 2014 by rvidyagovindarajan_1

1 answer

The projection of a line segment on $x,y,z$ axes are $12,\:4,\:3$ respectively, then the length of the line segment is ?

asked Jan 11, 2014 by rvidyagovindarajan_1

1 answer

The locus of a point $(x,y,z)$ for which $z=k$ is a ?

asked Jan 11, 2014 by rvidyagovindarajan_1

1 answer

The points $(5,0,2),\:(2,-6,0),\:(4,-9,6)\:and\:(7,-3,8)$ represent vertices of a ?

asked Jan 11, 2014 by rvidyagovindarajan_1

1 answer

Which of the following statement is (are) correct ?

asked Jan 10, 2014 by sreemathi.v

1 answer

Which atom has as many as s-electron and p-electrons?

asked Jan 10, 2014 by sreemathi.v

1 answer

In which electronic level,the H atom can absorb the photon but cannot emit a photon?

asked Jan 10, 2014 by sreemathi.v

1 answer

In potassium atom,electronic energylevel is in the order:

asked Jan 10, 2014 by sreemathi.v

1 answer

Out of first 100 elements,number of elements having electrons in 3d-orbitals are

asked Jan 10, 2014 by sreemathi.v

1 answer

Which will be the most stable among $Cu^{+},Fe^+,Fe^{2+}$ and $Fe^{3+}$

asked Jan 10, 2014 by sreemathi.v

1 answer

A line segment of length $21$ has $d.r.=(2,-3,6)$ and makes obtuse angle with $x\:axis$, then the components of the line segment (vector) are?

asked Jan 10, 2014 by rvidyagovindarajan_1

1 answer

Determine the element of lowest atomic number that contains a complete d subshell in the ground state.

asked Jan 10, 2014 by sreemathi.v

1 answer

In ground state of $_{24}Cr$

asked Jan 10, 2014 by sreemathi.v

1 answer

How many unpaired electrons are there in $Ni^{2+}$

asked Jan 10, 2014 by sreemathi.v

1 answer

The magnetic moment of electron in an atom(excluding orbital magnetic moment) is given by

asked Jan 10, 2014 by sreemathi.v

1 answer

Which of the following ions has the highest magnetic moment ?

asked Jan 10, 2014 by sreemathi.v

1 answer

If $P(2,3,4)\;and\:Q(1,b,1)$ are two points and $O$ is origin such that $OP$ is $\perp$ to $OQ$, then $b=?$

asked Jan 10, 2014 by rvidyagovindarajan_1

1 answer

Magnetic moment of $Fe^{a+}(z=26)$ is $\sqrt{24}$BM.Hence number of unpaired electrons and value of a respectively are :

asked Jan 10, 2014 by sreemathi.v

1 answer

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