Questions 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 \(0.3 V\).

asked 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 :

asked 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:

asked Dec 31, 2021 in Kinematics

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

asked 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 :

asked 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

asked 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?

asked Dec 30, 2021 in Some basic concepts in chemistry

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3 answers

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

asked Dec 30, 2021 in Some basic concepts in chemistry

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2 answers

Identify the incorrect statement.

asked 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? \(\mathrm{CH}_{4}(g)+4 C l_{2}(g) \rightarrow C C l_{4}(l)+4 H C l(g)\)

asked Dec 30, 2021 in Some basic concepts in chemistry

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20 answers

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

asked Dec 30, 2021 in Some basic concepts in chemistry

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Which one of the followings has maximum number of atoms ?

asked Dec 30, 2021 in Some basic concepts in chemistry

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3 answers

Q. Smoke is an example of:

asked Dec 30, 2021 in Some basic concepts in chemistry

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1 answer

Q. Which of the following is diamagnetic ?

asked Dec 30, 2021 in Some basic concepts in chemistry

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33 answers

Q. S.I. unit of velocity is

asked Dec 30, 2021 in Biology

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3 answers

Q. Which of the following is a dimensionless quantity?

asked Dec 30, 2021 in Biology

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Q. The unit of specific conductivity is

asked Dec 30, 2021 in Biology

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1 answer

The solids which have negative temperature coefficient of resistance are :

asked Dec 29, 2021 in Kinematics

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10 answers

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?

asked Dec 29, 2021 in Kinematics

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3 answers

The energy equivalent of \(0.5 \mathrm{~g}\) of a substance is:

asked Dec 29, 2021 in Kinematics

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