Physics-
General
Easy
Question
A siphon in use is demonstrated in the following figure. The density of the liquid flowing in siphon is 1.5 gm/cc. The pressure difference between the point P and S will be
- 105 N/m
- 2 × 105 N/m
- Zero
- Infinity
The correct answer is: Zero
As the both points are at the surface of liquid and these points are in the open atmosphere. So both point possess similar pressure and equal to 1 atm. Hence the pressure difference will be zero.
Related Questions to study
Chemistry-
Acetylene on treatment with dilute.
having 
gives:
Acetylene on treatment with dilute. having gives:
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In the given reaction,
X will be:
In the given reaction,
X will be:
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(isomeric products), 
(isomeric products) Give the number of N and M:
(isomeric products), (isomeric products) Give the number of N and M:
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Free radical halogenation takes place in tile presence of light or at high temperature (above 500
C). Formation of halogen free radical intermediate takes place in first step called chain initiation •.
This reaction is mainly given by those compounds which have at least one hydrogen atom present at sp3 -hybrid carbon. Reactivity of 
-hybrid carbon depends on' the reactivity of reaction intermediate.
The relative rate of formation of alkyl radicals by a chlorine radical is:
Relative amount =
Relative amount = Number of hydrogen atoms on the respective carbon x relative reactivity. NBS (N-Bromo succinimide) is used for bromination at allylic and benzylic carbon, whereas 
gives bromination at benzylic, allylic and alkyl carbons Which one of the following compounds will react with NBS?
Free radical halogenation takes place in tile presence of light or at high temperature (above 500C). Formation of halogen free radical intermediate takes place in first step called chain initiation •.
This reaction is mainly given by those compounds which have at least one hydrogen atom present at sp3 -hybrid carbon. Reactivity of -hybrid carbon depends on' the reactivity of reaction intermediate.
The relative rate of formation of alkyl radicals by a chlorine radical is:
Relative amount =
Relative amount = Number of hydrogen atoms on the respective carbon x relative reactivity. NBS (N-Bromo succinimide) is used for bromination at allylic and benzylic carbon, whereas gives bromination at benzylic, allylic and alkyl carbons Which one of the following compounds will react with NBS?
Chemistry-General
Chemistry-
Nucleophilic substitution reaction" is given by those compounds which have nucleophilic. groups as leaving groups. The weaker the basicity of a group of the substrate, the better is its leaving ability. In nucleophilic substitution reactions, the basicity of leaving group should be less than the incoming nucleophilic group. Nucleophilic substitution reaction at sp3-hybridised carbon is either bimolecular 
or 1lIlim0lecular: 
Bimolecular reaction takes place in single step, involving transition state intermediate. In 
reaction, inversion in configuration takes place. In case of optically active alkyl halides, the inversion in configuration is called Walden "inversion. reaction is preferred if the compound has less steric hindrance. " Unimolecular ( ) reaction" involves two steps and" carbonium ion intermediate. Optically active" substrates give racemic mixture in these" reactions.
Which among the following will give reaction?
I) 
II) 
III) 
IV) 
Nucleophilic substitution reaction" is given by those compounds which have nucleophilic. groups as leaving groups. The weaker the basicity of a group of the substrate, the better is its leaving ability. In nucleophilic substitution reactions, the basicity of leaving group should be less than the incoming nucleophilic group. Nucleophilic substitution reaction at sp3-hybridised carbon is either bimolecular or 1lIlim0lecular: Bimolecular reaction takes place in single step, involving transition state intermediate. In reaction, inversion in configuration takes place. In case of optically active alkyl halides, the inversion in configuration is called Walden "inversion. reaction is preferred if the compound has less steric hindrance. " Unimolecular ( ) reaction" involves two steps and" carbonium ion intermediate. Optically active" substrates give racemic mixture in these" reactions.
Which among the following will give reaction?
I)
II)
III)
IV)
Chemistry-General
Chemistry-
Identify the correct order of reactivity in electrophilic substitution reactions of the following compounds:
I) 
II) 
III) 
IV) 
Identify the correct order of reactivity in electrophilic substitution reactions of the following compounds:
I)
II)
III)
IV)
Chemistry-General
Chemistry-
Dehydrobromination (HBr-) of the following in increasing order will be:
I) 
II) 
III) 
Dehydrobromination (HBr-) of the following in increasing order will be:
I)
II)
III)
Chemistry-General
Chemistry-
by the reaction is:
by the reaction is:
Chemistry-General
Chemistry-
Oxidation of alkenes by cleavage with acidic or alkaline KMn04 or acidic K2Cr2O7 at higher temperature yields products depending upon the nature of aIkene. A hot solution ofKMnO4 is a strong oxidising agent which gives only ketones and carboxylic . acids and not aldehydes (as they cannot be isolated).
Oxidation of alkenes with OsO4 followed by alcoholic NaHSO3 or Na2SO4 yields glycols.
An alkene 1,2-dimethyl cyclobutene on oxidation With. hot KMnO4 gives:
Oxidation of alkenes by cleavage with acidic or alkaline KMn04 or acidic K2Cr2O7 at higher temperature yields products depending upon the nature of aIkene. A hot solution ofKMnO4 is a strong oxidising agent which gives only ketones and carboxylic . acids and not aldehydes (as they cannot be isolated).
Oxidation of alkenes with OsO4 followed by alcoholic NaHSO3 or Na2SO4 yields glycols.
An alkene 1,2-dimethyl cyclobutene on oxidation With. hot KMnO4 gives:
Chemistry-General
Chemistry-
Oxidation of alkenes by cleavage with acidic or alkaline KMn04 or acidic K2Cr2O7 at higher temperature yields products depending upon the nature of aIkene. A hot solution ofKMnO4 is a strong oxidising agent which gives only ketones and carboxylic . acids and not aldehydes (as they cannot be isolated).
Oxidation of alkenes with OsO4 followed by alcoholic NaHSO3 or Na2SO4 yields glycols.
An alkene 1,2-dimethyl cyclobutene on oxidation With. hot KMnO4 gives:
Oxidation of alkenes by cleavage with acidic or alkaline KMn04 or acidic K2Cr2O7 at higher temperature yields products depending upon the nature of aIkene. A hot solution ofKMnO4 is a strong oxidising agent which gives only ketones and carboxylic . acids and not aldehydes (as they cannot be isolated).
Oxidation of alkenes with OsO4 followed by alcoholic NaHSO3 or Na2SO4 yields glycols.
An alkene 1,2-dimethyl cyclobutene on oxidation With. hot KMnO4 gives:
Chemistry-General
Chemistry-
Oxidation of alkenes by cleavage with acidic or alkaline KMn04 or acidic K2Cr2O7 at higher temperature yields products depending upon the nature of aIkene. A hot solution ofKMnO4 is a strong oxidising agent which gives only ketones and carboxylic . acids and not aldehydes (as they cannot be isolated).
Oxidation of alkenes with OsO4 followed by alcoholic NaHSO3 or Na2SO4 yields glycols.
An alkene 1,2-dimethyl cyclobutene on oxidation With. hot KMnO4 gives:
Oxidation of alkenes by cleavage with acidic or alkaline KMn04 or acidic K2Cr2O7 at higher temperature yields products depending upon the nature of aIkene. A hot solution ofKMnO4 is a strong oxidising agent which gives only ketones and carboxylic . acids and not aldehydes (as they cannot be isolated).
Oxidation of alkenes with OsO4 followed by alcoholic NaHSO3 or Na2SO4 yields glycols.
An alkene 1,2-dimethyl cyclobutene on oxidation With. hot KMnO4 gives:
Chemistry-General
Maths-
Out of 21 tickets marked with numbers from 1 to 21, three are drawn at random. The chance that the numbers on them are in A.P., is
Out of 21 tickets marked with numbers from 1 to 21, three are drawn at random. The chance that the numbers on them are in A.P., is
Maths-General
Maths-
Three distinct numbers are selected from first 100 natural numbers. The probability that all the three numbers are divisible by 2 and 3 is
We should know the formula for combinations. We should know the concept of probability.
Three distinct numbers are selected from first 100 natural numbers. The probability that all the three numbers are divisible by 2 and 3 is
Maths-General
We should know the formula for combinations. We should know the concept of probability.
Maths-
Suppose values taken by a variable x are such that 
, where 
denotes the value of x in the ith case for i = 1, 2, n. Then
Suppose values taken by a variable x are such that , where denotes the value of x in the ith case for i = 1, 2, n. Then
Maths-General
Chemistry-
Oxidation without cleavage of sigma bond takes place in alkenes.
Presence of unsaturation· -in alkenes is detected by using Baeyer's reagent. Alkenes decolourise pink colour of Baeyer’s. reagent. In presence of Baeyer's reagent, 'syn' addition of-OH groups takes place on both carbons· of double· bond. The net reaction can be given as,
Ozonolysis of· alkenes give ozonide, which on further hydrolysis gives aldehyde and/or ketone.
Linear polyenes on. ozonolysis gives two moles of acetaldehyde and one mole of propanedial. Linear polyene will be:
Oxidation without cleavage of sigma bond takes place in alkenes.
Presence of unsaturation· -in alkenes is detected by using Baeyer's reagent. Alkenes decolourise pink colour of Baeyer’s. reagent. In presence of Baeyer's reagent, 'syn' addition of-OH groups takes place on both carbons· of double· bond. The net reaction can be given as,
Ozonolysis of· alkenes give ozonide, which on further hydrolysis gives aldehyde and/or ketone.
Linear polyenes on. ozonolysis gives two moles of acetaldehyde and one mole of propanedial. Linear polyene will be:
Chemistry-General
