Physics-
General
Easy
Question
In figure shown on the right above, the spring constant is K. The mass of the upper disc is m and that of the lower disc is 3m. The upper block is depressed down from its equilibrium position by a distance d and released at t =0.
The minimum value of d for which the lower disc loses contact with the ground is
- 3mg/K
- 2mg/K
- 4mg/K
- mg/K
The correct answer is: 4mg/K
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physics-
In figure shown on the right, the spring constant is K. The mass of block is m. The block is imparted a downward velocity = v0 at t = 0, at its equilibrium position.
If 
then, the maximum descent of the block from t = 0 is
In figure shown on the right, the spring constant is K. The mass of block is m. The block is imparted a downward velocity = v0 at t = 0, at its equilibrium position.
If then, the maximum descent of the block from t = 0 is
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The value of for which the minimum pull force on ceiling is 
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The value of for which the minimum pull force on ceiling is , will be
physics-General
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In figure shown on the right, the spring constant is K. The mass of block is m. The block is imparted a downward velocity = v0 at t = 0, at its equilibrium position.
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A particle starts from a point P at a distance of A/2 from the mean position O & travels towards left as shown in the figure. If the time period of SHM, executed about O is T and amplitude A then the equation of motion of particle is :
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physics-General
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The correct order of hybridization of the central atom in the following species 
and 
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A complex compound of cobalt has molecular formula containing five 
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chemistry-General
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In the Hofmann rearrangement an unsubstituted amide is treated with sodium hydroxide and bromine to give a primary amine that has one carbon lesser than starting amide.
General reaction :
Mechanism :
If the migrating group is chiral then its configuration is retained. Electron releasing effects in the migrating group increases reactivity of Hofmann rearrangement.
Which of the following compound(s) cannot give Hoffmann rearrangement :
In the Hofmann rearrangement an unsubstituted amide is treated with sodium hydroxide and bromine to give a primary amine that has one carbon lesser than starting amide.
General reaction :
Mechanism :
If the migrating group is chiral then its configuration is retained. Electron releasing effects in the migrating group increases reactivity of Hofmann rearrangement.
Which of the following compound(s) cannot give Hoffmann rearrangement :
chemistry-General
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Statement-I : The order of base catalysed hydrolysis of ester is
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2) 
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1)
2)
Statement-II : The reaction is sterically as well as electronically controlled reaction.
chemistry-General
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Select the correct statement.
Select the correct statement.
chemistry-General
chemistry-
X is :
X is :
chemistry-General
chemistry-
X is :
X is :
chemistry-General
chemistry-
Identify final product in the following reaction
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chemistry-General
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Which of the following is correct order of esterification of following acids with CH3OH :
I) HCOOH
II) 
III) 
IV) 
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I) HCOOH
II)
III)
IV)
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The product (Q) is
The product (Q) is
chemistry-General
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In this reaction the product (E) is :
In this reaction the product (E) is :
chemistry-General
