Physics-
General
Easy

Question

An electron which is initially at rest is accelerated through a potential difference of one volt. The energy acquired by the electron is

  1. 10–19J    
  2. 1.6×10–19erg    
  3. 1.6×10–19J    
  4. zero    

The correct answer is: 1.6×10–19J

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A charge q is placed at the centre of the open end of a cylindrical vessel. The flux of the electric field through the surface of the vessel is

A charge q is placed at the centre of the open end of a cylindrical vessel. The flux of the electric field through the surface of the vessel is

physics-General
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Fig. shows a distribution of charges. The flux of electric field due to these charges through the surface S is

Fig. shows a distribution of charges. The flux of electric field due to these charges through the surface S is

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As per fig. a point charge +q is placed at the origin O. Work done in taking another point charge –Q from the point A [Co-ordinates (0,a)] to another point B [Co-ordinates (a, 0)] along the straight path AB is :

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physics-General
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Maths-

Let omega not equal to 1 be a cube root of unity and S be the set of all non‐singular matrices of the form open square brackets table row 1 a b row omega 1 c row cell omega to the power of 2 end exponent end cell omega 1 end table close square brackets, where each of a, b and c is either omega text  or  end text omega to the power of 2 end exponent Then the number of distinct matrices in the set S is‐

Hence no of matrices formed = 2

Let omega not equal to 1 be a cube root of unity and S be the set of all non‐singular matrices of the form open square brackets table row 1 a b row omega 1 c row cell omega to the power of 2 end exponent end cell omega 1 end table close square brackets, where each of a, b and c is either omega text  or  end text omega to the power of 2 end exponent Then the number of distinct matrices in the set S is‐

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Hence no of matrices formed = 2

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Let A be a 2 cross times 2 matrix with non‐zero entries and let A to the power of 2 end exponent equals I, where I is 2 cross times 2 identity matrix Defi ne Tr(A) equals s u m of diagonal elements o f A and vertical line A vertical line equalsdeterminant of matrix A
Statement 1: Tr(A) equals 0.
Statement 2: vertical line A vertical line equals 1.

Hence option C is suitable option

Let A be a 2 cross times 2 matrix with non‐zero entries and let A to the power of 2 end exponent equals I, where I is 2 cross times 2 identity matrix Defi ne Tr(A) equals s u m of diagonal elements o f A and vertical line A vertical line equalsdeterminant of matrix A
Statement 1: Tr(A) equals 0.
Statement 2: vertical line A vertical line equals 1.

Maths-General

Hence option C is suitable option

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If A equals left square bracket subscript 1 end subscript superscript 1 end superscript 01 right square bracket and I equals left square bracket subscript 0 end subscript superscript 1 end superscript 01 right square bracket, then which one of the following holds for all n greater or equal than 1, (by the principal of mathematical induction)

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If F left parenthesis alpha right parenthesis equals open curly brackets table attributes columnalign left end attributes row cell c o s alpha end cell cell negative s i n alpha end cell 0 row cell s i n alpha end cell cell c o s alpha end cell 0 row 0 0 1 end table close curly brackets a n d G left parenthesis beta right parenthesis equals open square brackets table row cell c o s invisible function application beta end cell 0 cell s i n invisible function application beta end cell row 0 1 0 row cell negative s i n invisible function application beta end cell 0 cell c o s invisible function application beta end cell end table close square brackets, then left square bracket F left parenthesis alpha right parenthesis G left parenthesis beta right parenthesis right square bracket to the power of negative 1 end exponent equals

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maths-

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