Recent questions tagged sat

If number of electrons of $^{37}X^-$ and $_{20}Y^{+2}$ are equal; find number of neutrons of $^{37}X^-$.

asked Jul 18, 2018 by swapnarajan1982

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Which one of the following statements are always true for neutral atoms

asked Jul 18, 2018 by swapnarajan1982

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A 1 MeV proton is sent against a gold leaf (Z = 79). Calculate the distance of closest approach for head on collision.

asked Jul 18, 2018 by swapnarajan1982

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Calculate the ratio of K.E and P.E of an electron in an orbit?

asked Jul 18, 2018 by swapnarajan1982

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An orbital may never be occupied by

asked Jul 17, 2018 by swapnarajan1982

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The sublevel that can be occupied by a maximum of 10 electrons is identified by the letter

asked Jul 17, 2018 by swapnarajan1982

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The sublevel that has only one orbital is identified by the letter

asked Jul 17, 2018 by swapnarajan1982

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The lowest principal quantum number that an electron can have is

asked Jul 17, 2018 by swapnarajan1982

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The two main regions of an atom are the

asked Jul 17, 2018 by swapnarajan1982

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Discovery of the nucleus of an atom was due to the experiment carried out by

asked Jul 17, 2018 by swapnarajan1982

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The ratio of the energy of a photon of 2000A wavelength radiation to that of 4000A radiation is

asked Jul 17, 2018 by swapnarajan1982

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Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two times respectively to their actual masses, then the atomic mass of ${_6}C^{12}$

asked Jul 17, 2018 by swapnarajan1982

1 answer

What is the wavelength associated with 150 eV electron

asked Jul 17, 2018 by swapnarajan1982

2 answers

In an alpha scattering experiment, few alpha particles rebounded because

asked Jul 17, 2018 by sharmaaparna1

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Which of the following ions will have maximum magnetic moment

asked Jul 17, 2018 by sharmaaparna1

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Find Atomic number of element that has electron configuration lasting with $6p^2$

asked Jul 17, 2018 by sharmaaparna1

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Calculate the de Broglie wavelength of an electron moving with a velocity of $5.0\times10^5ms^{–1}$

asked Jul 17, 2018 by swapnarajan1982

1 answer

In a right angled triangle, one of the angles measure $x^{\circ}$ If $\sin x^{\circ}=\large\frac{\sqrt 3}{2}$ . What is $\cos(90-x)$ ?

asked Jul 9, 2018 by meena.p

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In a triangle $PQR$ right angled at $Q$, $QR=12\;cm$ and $PR=20\;cm$ . Triangle $ABC$ is similar to triangle $PQR$ where the vertices P,Q and R are corresponding to the vertices A,B and C. Each side of $\Delta ABC$ is $\large\frac{1}{4}$ the length of the corresponding slides of $\Delta PQR$. What is the value of $\sin C$ ?

asked Jul 9, 2018 by meena.p

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A building $A,B$ is 40 m long. It cuts the shadow that is as long as the building then what is an angle $x$ in the given figure below?

asked Jul 9, 2018 by meena.p

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If $x$ is an angle such that $0< x<90^{\circ}$, which of the following statements is not always true?

asked Jul 9, 2018 by meena.p

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Simplify $(3i)^9$

asked Jul 9, 2018 by meena.p

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Simplify $(2+3i)(1-i)$

asked Jul 9, 2018 by meena.p

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If $x=2+i$ and y is its complex conjugate then evaluate $x^2+2xy+y^2$

asked Jul 9, 2018 by meena.p

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Evaluate $(5i)^4.(4i)^3$

asked Jul 9, 2018 by meena.p

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The complex number $2+4i$ is one of the roots to the quadratic equation $x^2+bx+c=0$ where $b$ and $c$ are real numbers. The values of $b$ and $c$ are

asked Jul 9, 2018 by meena.p

1 answer

Find the value of $k$ if $\large\frac{2-ki}{k-i}$ is purely an imaginary number.

asked Jul 9, 2018 by meena.p

1 answer

$\cos^4 \theta-\sin^4 \theta=$

asked Jul 6, 2018 by meena.p

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$cosec \bigg(\large\frac{13 \pi}{6}\bigg)$ is equal to

asked Jul 6, 2018 by meena.p

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$\cot -300^{\circ} =$

asked Jul 6, 2018 by meena.p

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$\sin^2 \large\frac{\pi}{4} + \normalsize \cos^2 \large\frac{\pi}{3}-$$2 \tan^2 \large\frac{\pi}{3}$ is

asked Jul 6, 2018 by meena.p

1 answer

In a right angled triangle $ABC$, and if $\angle C$ is $90^{\circ}$, and if $\tan B=\large\frac{4}{3}$, find the value of $\sin ^2A+\cos ^2B$

asked Jul 6, 2018 by meena.p

1 answer

given $\sin x=k$, where $\large\frac{\pi}{2} < \normalsize x< \large\frac{\rho \pi}{2}$ and $x$ is a radian measure of an angle. $\sin z=-k$ which of the following could not be the value ?

asked Jul 6, 2018 by meena.p

1 answer

Simplify the below expression and express in the form of $a+ib$<br><br> $\qquad \qquad \qquad \qquad \large\frac{5-i}{7+i}$

asked Jul 6, 2018 by meena.p

1 answer

If $4x^2=y^3$, what is the following equivalent to in terms of: $y$ <br><br>$\qquad \qquad \qquad \large\frac{x}{\sqrt y}$

asked Jul 6, 2018 by meena.p

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Evaluate $9i^9+10i^{10}+11i^{11}+12i^{12}$

asked Jul 6, 2018 by meena.p

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An arithmetic sequence begins as follows: $3,3i........$ Give the next term of the sequence

asked Jul 6, 2018 by meena.p

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From $\large\frac{3}{4}+\frac{1}{2}\;$$i$ subtract its complex conjugate . What is the difference ?

asked Jul 6, 2018 by meena.p

1 answer

If ten volume of dihydrogen gas reacts with five volumes of dioxygen gas, how many volumes of water vapour could be produced ?

asked Jul 5, 2018 by meena.p

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If the speed of lights is $3.0 \times 10^{8}\;ms^{-1}$. calculate the distance covered by light in 2.00 ns

asked Jul 5, 2018 by meena.p

1 answer

If the density of methanol is $0.793\; kg L^{-1}$ what is its volume needed for making 2.5 L of its $0.25\;M$ solution ?

asked Jul 5, 2018 by meena.p

1 answer

One mole of $H_2O$ equals

asked Jul 5, 2018 by meena.p

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Relative molecular masses can be calculated

asked Jul 5, 2018 by meena.p

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__________ is mass of a particular substance divided by the total mass of all the substances present in the mixture or solution.

asked Jul 5, 2018 by meena.p

1 answer

A pseudo molecular weight computed by dividing the mass in a mixture or solution by the number of moles in the mixture or solution is called

asked Jul 4, 2018 by meena.p

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$40\; gms$ of $NaOH$ contains

asked Jul 4, 2018 by meena.p

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58.5 gms of NaCl contains

asked Jul 4, 2018 by meena.p

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Amount of substance containing $6.022 \times 10^{23}$ entities is called

asked Jul 4, 2018 by meena.p

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We don`t use volume balance in a chemical process because

asked Jul 4, 2018 by meena.p

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The law of _____________ states that chemical reactions proceed with fix ratios of the number of reactant and products and products involved in the reaction.

asked Jul 4, 2018 by meena.p

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