Physics-
General
Easy

Question

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 v subscript 0 end subscript equals 3 g square root of fraction numerator m over denominator K end fraction end root then, the maximum descent of the block from t = 0 is

  1. 2mg/K    
  2. 6mg/K    
  3. 4mg/K    
  4. 3mg/K    

The correct answer is: 2mg/K

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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 = V subscript 0 end subscript at t = 0, at its equilibrium position.

The value of V subscript 0 end subscript for which the minimum pull force on ceiling is open parentheses fraction numerator m g over denominator 2 end fraction close parentheses , will be

In figure shown on the right, the spring constant is K. The mass of block is m. The block is imparted a downward velocity = V subscript 0 end subscript at t = 0, at its equilibrium position.

The value of V subscript 0 end subscript for which the minimum pull force on ceiling is open parentheses fraction numerator m g over denominator 2 end fraction close parentheses , will be

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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.

The value of V subscript 0 end subscript for which the block has zero velocity when spring is in its natural position 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.

The value of V subscript 0 end subscript for which the block has zero velocity when spring is in its natural position is

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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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The correct order of hybridization of the central atom in the following species N H subscript 3 end subscript comma open square brackets P t C l subscript 4 end subscript close square brackets to the power of 2 minus end exponent P C l subscript 5 end subscript superscript minus end superscript and B C l subscript 3 end subscript is (At. No. Pt = 78)

The correct order of hybridization of the central atom in the following species N H subscript 3 end subscript comma open square brackets P t C l subscript 4 end subscript close square brackets to the power of 2 minus end exponent P C l subscript 5 end subscript superscript minus end superscript and B C l subscript 3 end subscript is (At. No. Pt = 78)

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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 :

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Which of the following compound(s) cannot give Hoffmann rearrangement :

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Statement-I : The order of base catalysed hydrolysis of ester is
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Select the correct statement.

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X is :

X is :

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X is :

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Which of the following is correct order of esterification of following acids with CH3OH :
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III) C H subscript 3 end subscript minus C H subscript 2 end subscript minus C O O H
IV) 

Which of the following is correct order of esterification of following acids with CH3OH :
I) HCOOH
II) C H subscript 3 end subscript C O O H
III) C H subscript 3 end subscript minus C H subscript 2 end subscript minus C O O H
IV) 

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 In this reaction the product (E) is :

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would be : (A)

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