Answers by deepak01

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. Consider the following statements (A) and (B) and identify the correct answer. (A) A zener diode is connected in reverse bias, when used as a voltage regulator. (B) The potential barrier of p-n junction lies between \(0.1 V\) to \(0.3 V\).

answered Dec 31, 2021 in Kinematics

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. A spring is stretched by \(5 \mathrm{~cm}\) by a force \(10 \mathrm{~N}\). The time period of the oscillations when a mass of \(2 \mathrm{~kg}\) is suspended by it is :

answered Dec 31, 2021 in Kinematics

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If \(E\) and \(G\) respectively denote energy and gravitational constant, then \(\frac{E}{G}\) has the dimensions of:

answered Dec 31, 2021 in Kinematics

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Two charged spherical conductors of radius \(R_{1}\) and \(R_{2}\) are connected by a wire. Then the ratio of surface charge densities of the spheres \(\left(\sigma_{1} / \sigma_{2}\right)\) is

answered Dec 31, 2021 in Kinematics

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Which of the following alkane cannot be made in good yield by Wurtz reaction?

answered Dec 30, 2021 in Some basic concepts in chemistry

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. The rate constant for a first order reaction is \(4.606 \times 10^{-3} \mathrm{~s}^{-1}\). The time required to reduce \(2.0 \mathrm{~g}\) of the reactant to \(0.2 \mathrm{~g}\) is :

answered Dec 30, 2021 in Some basic concepts in chemistry

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Urea reacts with water to form \(A\) which will decompose to form \(B\). \(B\) when passed through \(C u^{2+}(a q)\), deep blue colour solution \(\mathrm{C}\) is formed. What is the formula of \(\mathrm{C}\) from the following

answered Dec 30, 2021 in Some basic concepts in chemistry

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Measuring Zeta potential is useful in determining which property of colloidal solution?

answered Dec 30, 2021 in Some basic concepts in chemistry

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For the reaction \(2 C l(g) \rightarrow C l_{2}(g)\), the correct option is:

answered Dec 30, 2021 in Some basic concepts in chemistry

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Identify the incorrect statement.

answered Dec 30, 2021 in Some basic concepts in chemistry

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What is the change in oxidation number of carbon in the following reaction? \(\mathrm{CH}_{4}(g)+4 C l_{2}(g) \rightarrow C C l_{4}(l)+4 H C l(g)\)

answered Dec 30, 2021 in Some basic concepts in chemistry

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The number of protons, neutrons and electrons in \({ }_{71}^{175} L u\), respectively, are :

answered Dec 30, 2021 in Some basic concepts in chemistry

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Which one of the followings has maximum number of atoms ?

answered Dec 30, 2021 in Some basic concepts in chemistry

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The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na, is responsible for the transmission of nerve signals.

answered Dec 30, 2021 in Some basic concepts in chemistry

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Q. Smoke is an example of:

answered Dec 30, 2021 in Some basic concepts in chemistry

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Q. Which of the following is diamagnetic ?

answered Dec 30, 2021 in Some basic concepts in chemistry

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Q. S.I. unit of velocity is

answered Dec 30, 2021 in Biology

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Q. Which of the following is a dimensionless quantity?

answered Dec 30, 2021 in Biology

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Q. The unit of specific conductivity is

answered Dec 30, 2021 in Biology

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A body weighs \(72 \mathrm{~N}\) on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth?

answered Dec 29, 2021 in Kinematics

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