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Questions asked by meena.p
Questions
14353
questions
1
answer selected
If $x=2+i$ and y is its complex conjugate then evaluate $x^2+2xy+y^2$
sat
math
trigonometry
asked
Jul 9, 2018
1
answer
Evaluate $(5i)^4.(4i)^3$
sat
math
trigonometry
asked
Jul 9, 2018
1
answer
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
sat
math
trigonometry
asked
Jul 9, 2018
1
answer
Find the value of $k$ if $\large\frac{2-ki}{k-i}$ is purely an imaginary number.
sat
math
trigonometry
asked
Jul 9, 2018
1
answer
$\cos^4 \theta-\sin^4 \theta=$
sat
math
trigonometry
asked
Jul 6, 2018
1
answer
$cosec \bigg(\large\frac{13 \pi}{6}\bigg)$ is equal to
sat
math
trigonometry
asked
Jul 6, 2018
1
answer
$\cot -300^{\circ} =$
sat
math
trigonometry
asked
Jul 6, 2018
1
answer
$\sin^2 \large\frac{\pi}{4} + \normalsize \cos^2 \large\frac{\pi}{3}-$$2 \tan^2 \large\frac{\pi}{3}$ is
sat
math
trigonometry
asked
Jul 6, 2018
1
answer
In a right angled triangle $ABC$, and if $\angle C$ is $90^{\circ}$, and if $\tan B=\large\frac{4}{3}$, find the value of $\sin ^2A+\cos ^2B$
sat
math
trigonometry
asked
Jul 6, 2018
1
answer
given $\sin x=k$, where $\large\frac{\pi}{2} < \normalsize x< \large\frac{\rho \pi}{2}$ and $x$ is a radian measure of an angle. $\sin z=-k$ which of the following could not be the value ?
sat
math
trigonometry
asked
Jul 6, 2018
1
answer
Simplify the below expression and express in the form of $a+ib$<br><br> $\qquad \qquad \qquad \qquad \large\frac{5-i}{7+i}$
sat
math
trigonometry
asked
Jul 6, 2018
1
answer
If $4x^2=y^3$, what is the following equivalent to in terms of: $y$ <br><br>$\qquad \qquad \qquad \large\frac{x}{\sqrt y}$
sat
math
trigonometry
asked
Jul 6, 2018
1
answer
Evaluate $9i^9+10i^{10}+11i^{11}+12i^{12}$
sat
math
trigonometry
asked
Jul 6, 2018
1
answer
An arithmetic sequence begins as follows: $3,3i........$ Give the next term of the sequence
sat
math
trigonometry
asked
Jul 6, 2018
1
answer
From $\large\frac{3}{4}+\frac{1}{2}\;$$i$ subtract its complex conjugate . What is the difference ?
sat
math
trigonometry
asked
Jul 6, 2018
1
answer
If ten volume of dihydrogen gas reacts with five volumes of dioxygen gas, how many volumes of water vapour could be produced ?
sat
chemistry
stoichiometry and the mole concept
asked
Jul 5, 2018
1
answer
If the speed of lights is $3.0 \times 10^{8}\;ms^{-1}$. calculate the distance covered by light in 2.00 ns
sat
chemistry
stoichiometry and the mole concept
asked
Jul 5, 2018
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 ?
sat
chemistry
stoichiometry and the mole concept
asked
Jul 5, 2018
1
answer
One mole of $H_2O$ equals
sat
chemistry
stoichiometry and the mole concept
asked
Jul 5, 2018
1
answer
Relative molecular masses can be calculated
sat
chemistry
stoichiometry and the mole concept
asked
Jul 5, 2018
1
answer
__________ is mass of a particular substance divided by the total mass of all the substances present in the mixture or solution.
sat
chemistry
stoichiometry and the mole concept
asked
Jul 5, 2018
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
sat
chemistry
stoichiometry and the mole concept
asked
Jul 4, 2018
1
answer
$40\; gms$ of $NaOH$ contains
sat
chemistry
stoichiometry and the mole concept
asked
Jul 4, 2018
1
answer
58.5 gms of NaCl contains
sat
chemistry
stoichiometry and the mole concept
asked
Jul 4, 2018
1
answer
Amount of substance containing $6.022 \times 10^{23}$ entities is called
sat
chemistry
stoichiometry and the mole concept
asked
Jul 4, 2018
1
answer
We don`t use volume balance in a chemical process because
sat
chemistry
stoichiometry and the mole concept
asked
Jul 4, 2018
1
answer
The law of _____________ states that chemical reactions proceed with fix ratios of the number of reactant and products and products involved in the reaction.
sat
chemistry
stoichiometry and the mole concept
asked
Jul 4, 2018
1
answer
The given statement for stoichiometry is “Stoichiometry provides a quantitative means of relating the amount of products produced by a chemical reaction to amount of reaction and vice versa."
sat
chemistry
stoichiometry and the mole concept
asked
Jul 4, 2018
1
answer
Nitric acid formation reaction is given as below $3NO_2 + H_2O \to 2HNO3 + NO$ The given reaction is
sat
chemistry
stoichiometry and the mole concept
asked
Jul 4, 2018
1
answer
If $\sin x=\cos\bigg(\large\frac{13 \pi}{6}\bigg)$ find the value of x
sat
math
trigonometry
asked
Jul 4, 2018
1
answer
If $cosec \theta= \large\frac{5}{12}$ , find the value of $\sin^2 \theta+\cot ^3 \theta$
sat
math
trigonometry
asked
Jul 4, 2018
1
answer
If $\cot c=\sqrt 3$ and $AC=6$ , find the area of the circle
sat
math
trigonometry
asked
Jul 4, 2018
1
answer
Find the value of $cosec \bigg(\large\frac{2\pi}{3}\bigg)$
sat
math
trigonometry
asked
Jul 4, 2018
1
answer
Which of the following angle given below is coterminal with $750^{\circ}$ ?
sat
math
trigonometry
asked
Jul 4, 2018
1
answer
Simplify $i^{14}+i^{122}$
sat
math
trigonometry
asked
Jul 4, 2018
1
answer
Find the value of $\large\frac{\sqrt{-18}}{\sqrt{75}}$
sat
math
trigonometry
asked
Jul 4, 2018
1
answer
Simplify : $(3+4i)^2$
sat
math
trigonometry
asked
Jul 4, 2018
1
answer
Which of the following are the equation $x^2-4x+5$?
sat
math
trigonometry
asked
Jul 4, 2018
1
answer
Simplify the expression : $\large\frac{6+\sqrt 8 i}{3- \sqrt 2 i}$
sat
math
trigonometry
asked
Jul 4, 2018
1
answer
A 12.0 of gas sample of gas occupies $19.2\;L$ at STP. what is the molecule weight of this gas ?
sat
chemistry
stoichiometry and the mole concept
asked
Jul 3, 2018
1
answer
A molar solution is one that contains one mole of a solute in
sat
chemistry
stoichiometry and the mole concept
asked
Jul 3, 2018
1
answer
Which one of the following pairs of gases contains the same number of molecules
sat
chemistry
stoichiometry and the mole concept
asked
Jul 3, 2018
1
answer
How much copper can be obtained from 100 g of copper sulphate $(CuSO_4)?$ (Atomic mass of $Cu=63.5\;amu$)
sat
chemistry
stoichiometry and the mole concept
asked
Jul 3, 2018
1
answer
Calculate the mass of sodium acetate $(CH_3COONa)$ required to make 500 mL of $0.375$ molar aqueous solution . Molar mass of sodium acetate is $82.0245\;g\;mol^{-1}$
sat
chemistry
stoichiometry and the mole concept
asked
Jul 3, 2018
1
answer
If $\sin x =\large\frac{5}{12}$ find the value of $2 \sec^2 x +\cot^2 x$
sat
math
trigonometry
asked
Jul 2, 2018
1
answer
$60\;cm^3$ of oxygen was added to $24\;cm^3$ of carbon monoxide and the mixture is ignited. calculate (i) the volume of oxygen used up (ii) the volume of carbon dioxide fromed .
sat
chemistry
stoichiometry and the mole concept
asked
Jul 2, 2018
1
answer
From the equation :$N_2+3H_22NH_3$ calculate the volume of ammonia gas formed when 6 litres of hydrogen reacts with excess of nitrogen , all volumes being measured at $STP$
sat
chemistry
stoichiometry and the mole concept
asked
Jul 2, 2018
1
answer
Which ones of the following statements are true for 2 moles $CO_2$ compound. (Avogadro's Number $=6,02 \times 10^{23})$
sat
chemistry
stoichiometry and the mole concept
asked
Jul 2, 2018
1
answer
Calculate number of bromide ions in 3 moles of mercury (II) bromide
sat
chemistry
stoichiometry
and
the
mole
concept
asked
Jul 2, 2018
1
answer
How many moles of molecule are present in 15 g of $C_2H_4$(ethylene) . Given atomic mass of $C=12.0\;amu$ and of $H=1.0\;amu$
sat
chemistry
stoichiometry and the mole concept
asked
Jul 2, 2018
1
answer
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