Physics Past Year Paper Compartment Anskey (Outside Delhi Set -3) - 2014, Class 12 Class 12 Notes | EduRev

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Class 12 : Physics Past Year Paper Compartment Anskey (Outside Delhi Set -3) - 2014, Class 12 Class 12 Notes | EduRev

 Page 1


 Compartment Page No. 1 20th July, 2014 Final 
MARKING SCHEME 
SET 55/3 (Compartment) 
Q.No. Expected Answer/Value Points Marks Total 
Marks 
1. Line B 
Since slope (q/V) of B is lesser than that of A. 
½ 
½ 1 
2. Demodulation is the process of retrieval of information from the carrier wave at the 
receiver end. 
1 1 
3. 
1 
1 
4. A has positive polarity 1 1 
5. 
= 
1 1 
6. 
  =   where   is speed of electron 
Alternatively: 
   = 
1 
1 
7. In point to point communication, communication takes place over a single link 
between a transmitter and a receiver.  
In the broadcast mode, there are a large number of receivers corresponding to a 
single transmitter. 
½ 
½ 
1 
8. With increase in temperature, the relaxation time ( average time between successive 
collisions) decreases  and hence resistivity increases. 
Alternatively: 
Resistivity     increases as  decreases with increase in temperature. 
1 
1 
9 
 
 
 
(i) According to Biot Savart’s law, the magnetic field due to a current element 
carrying current I at a point with position P vector  is given by 
 = 
1 
(i) Statement of Biot Savart’s law 1 
(ii) Expression for magnetic field ½ 
(iii) Showing field lines  ½ 
Page 2


 Compartment Page No. 1 20th July, 2014 Final 
MARKING SCHEME 
SET 55/3 (Compartment) 
Q.No. Expected Answer/Value Points Marks Total 
Marks 
1. Line B 
Since slope (q/V) of B is lesser than that of A. 
½ 
½ 1 
2. Demodulation is the process of retrieval of information from the carrier wave at the 
receiver end. 
1 1 
3. 
1 
1 
4. A has positive polarity 1 1 
5. 
= 
1 1 
6. 
  =   where   is speed of electron 
Alternatively: 
   = 
1 
1 
7. In point to point communication, communication takes place over a single link 
between a transmitter and a receiver.  
In the broadcast mode, there are a large number of receivers corresponding to a 
single transmitter. 
½ 
½ 
1 
8. With increase in temperature, the relaxation time ( average time between successive 
collisions) decreases  and hence resistivity increases. 
Alternatively: 
Resistivity     increases as  decreases with increase in temperature. 
1 
1 
9 
 
 
 
(i) According to Biot Savart’s law, the magnetic field due to a current element 
carrying current I at a point with position P vector  is given by 
 = 
1 
(i) Statement of Biot Savart’s law 1 
(ii) Expression for magnetic field ½ 
(iii) Showing field lines  ½ 
 Compartment Page No. 2 20th July, 2014 Final 
(ii) B = 
Field lines 
½ 
½ 
2 
10. 
 
 
a) An electromagnet consists of a core made of a ferromagnetic material placed
inside a solenoid. It behaves like a strong magnet when current flows through
the solenoid and effectively loses its magnetism when the current is switched
off.
(i) A permanent magnet is also made up of a ferromagnetic material but it 
retains its magnetism at room temperature for a long time after being 
magnetized once. 
b) 
(i) High permeability 
(ii) Low retentivity 
(iii)Low coercivity 
(Any two) 
[Note: Give ½ mark if the student just writes ‘soft iron’ is a suitable material for 
making electromagnets.] 
½ 
½ 
½+ ½ 
2 
11. 
Let P be the required point at  a distance x from charge q 
½ 
½ 
(a) Difference between a permanent magnet and an electromagnet ½ + ½ 
(b) Any two properties of material  ½ + ½ 
Formula  ½ 
Substitution and simplification 1 
Result  ½ 
Page 3


 Compartment Page No. 1 20th July, 2014 Final 
MARKING SCHEME 
SET 55/3 (Compartment) 
Q.No. Expected Answer/Value Points Marks Total 
Marks 
1. Line B 
Since slope (q/V) of B is lesser than that of A. 
½ 
½ 1 
2. Demodulation is the process of retrieval of information from the carrier wave at the 
receiver end. 
1 1 
3. 
1 
1 
4. A has positive polarity 1 1 
5. 
= 
1 1 
6. 
  =   where   is speed of electron 
Alternatively: 
   = 
1 
1 
7. In point to point communication, communication takes place over a single link 
between a transmitter and a receiver.  
In the broadcast mode, there are a large number of receivers corresponding to a 
single transmitter. 
½ 
½ 
1 
8. With increase in temperature, the relaxation time ( average time between successive 
collisions) decreases  and hence resistivity increases. 
Alternatively: 
Resistivity     increases as  decreases with increase in temperature. 
1 
1 
9 
 
 
 
(i) According to Biot Savart’s law, the magnetic field due to a current element 
carrying current I at a point with position P vector  is given by 
 = 
1 
(i) Statement of Biot Savart’s law 1 
(ii) Expression for magnetic field ½ 
(iii) Showing field lines  ½ 
 Compartment Page No. 2 20th July, 2014 Final 
(ii) B = 
Field lines 
½ 
½ 
2 
10. 
 
 
a) An electromagnet consists of a core made of a ferromagnetic material placed
inside a solenoid. It behaves like a strong magnet when current flows through
the solenoid and effectively loses its magnetism when the current is switched
off.
(i) A permanent magnet is also made up of a ferromagnetic material but it 
retains its magnetism at room temperature for a long time after being 
magnetized once. 
b) 
(i) High permeability 
(ii) Low retentivity 
(iii)Low coercivity 
(Any two) 
[Note: Give ½ mark if the student just writes ‘soft iron’ is a suitable material for 
making electromagnets.] 
½ 
½ 
½+ ½ 
2 
11. 
Let P be the required point at  a distance x from charge q 
½ 
½ 
(a) Difference between a permanent magnet and an electromagnet ½ + ½ 
(b) Any two properties of material  ½ + ½ 
Formula  ½ 
Substitution and simplification 1 
Result  ½ 
 Compartment Page No. 3 20th July, 2014 Final 
 = 
   x=
required point is at a distance  from charge q 
Alternatively: 
2 =  or 
At distance d towards left of charge q
OR 
(i) We have W = 
 W = 
        = 
        = -2
(ii)    for 
Alternatively: 
½ 
½ 
½ 
½ 
½ 
½ 
½ 
½ 
1 
2 
2 
12. 
 
 
 
Difference between emf( ) and terminal voltage (v) 
terminal voltage 
1) It is the potential difference
between two terminals of the cells
when no current is drawn from it.
2) It is the cause.
1) It is the potential difference
between two terminals when
current passes through it.
2) It is the effect.
½ 
One difference between  and V ½ 
VI Graph ½ 
Determination of ‘r’ and  1 
(i) Work Done 1 
(ii) Orientation 1 
Page 4


 Compartment Page No. 1 20th July, 2014 Final 
MARKING SCHEME 
SET 55/3 (Compartment) 
Q.No. Expected Answer/Value Points Marks Total 
Marks 
1. Line B 
Since slope (q/V) of B is lesser than that of A. 
½ 
½ 1 
2. Demodulation is the process of retrieval of information from the carrier wave at the 
receiver end. 
1 1 
3. 
1 
1 
4. A has positive polarity 1 1 
5. 
= 
1 1 
6. 
  =   where   is speed of electron 
Alternatively: 
   = 
1 
1 
7. In point to point communication, communication takes place over a single link 
between a transmitter and a receiver.  
In the broadcast mode, there are a large number of receivers corresponding to a 
single transmitter. 
½ 
½ 
1 
8. With increase in temperature, the relaxation time ( average time between successive 
collisions) decreases  and hence resistivity increases. 
Alternatively: 
Resistivity     increases as  decreases with increase in temperature. 
1 
1 
9 
 
 
 
(i) According to Biot Savart’s law, the magnetic field due to a current element 
carrying current I at a point with position P vector  is given by 
 = 
1 
(i) Statement of Biot Savart’s law 1 
(ii) Expression for magnetic field ½ 
(iii) Showing field lines  ½ 
 Compartment Page No. 2 20th July, 2014 Final 
(ii) B = 
Field lines 
½ 
½ 
2 
10. 
 
 
a) An electromagnet consists of a core made of a ferromagnetic material placed
inside a solenoid. It behaves like a strong magnet when current flows through
the solenoid and effectively loses its magnetism when the current is switched
off.
(i) A permanent magnet is also made up of a ferromagnetic material but it 
retains its magnetism at room temperature for a long time after being 
magnetized once. 
b) 
(i) High permeability 
(ii) Low retentivity 
(iii)Low coercivity 
(Any two) 
[Note: Give ½ mark if the student just writes ‘soft iron’ is a suitable material for 
making electromagnets.] 
½ 
½ 
½+ ½ 
2 
11. 
Let P be the required point at  a distance x from charge q 
½ 
½ 
(a) Difference between a permanent magnet and an electromagnet ½ + ½ 
(b) Any two properties of material  ½ + ½ 
Formula  ½ 
Substitution and simplification 1 
Result  ½ 
 Compartment Page No. 3 20th July, 2014 Final 
 = 
   x=
required point is at a distance  from charge q 
Alternatively: 
2 =  or 
At distance d towards left of charge q
OR 
(i) We have W = 
 W = 
        = 
        = -2
(ii)    for 
Alternatively: 
½ 
½ 
½ 
½ 
½ 
½ 
½ 
½ 
1 
2 
2 
12. 
 
 
 
Difference between emf( ) and terminal voltage (v) 
terminal voltage 
1) It is the potential difference
between two terminals of the cells
when no current is drawn from it.
2) It is the cause.
1) It is the potential difference
between two terminals when
current passes through it.
2) It is the effect.
½ 
One difference between  and V ½ 
VI Graph ½ 
Determination of ‘r’ and  1 
(i) Work Done 1 
(ii) Orientation 1 
 Compartment Page No. 4 20th July, 2014 Final 
(Any one) or any other relevant difference 
Negative of slope gives internal resistance. 
1 
½ 2 
13. 
(i) For the AND gate: 
Truth Table Logic Symbol 
(ii) Output Waveform: 
½ +½ 
1 
2 
14. 
The condition for observing a rainbow are : 
i. The sun comes out after a rainfall.
ii. The observer stands with the sun towards his/her back. (any one)
½ 
½ 
(i) AND gate Truth Table ½ 
Logic symbol ½ 
(ii) Output waveform 1 
(a) Conditions ½ + ½ 
(b) Formation of rainbow 
     Diagram ½ 
Explanation ½ 
Page 5


 Compartment Page No. 1 20th July, 2014 Final 
MARKING SCHEME 
SET 55/3 (Compartment) 
Q.No. Expected Answer/Value Points Marks Total 
Marks 
1. Line B 
Since slope (q/V) of B is lesser than that of A. 
½ 
½ 1 
2. Demodulation is the process of retrieval of information from the carrier wave at the 
receiver end. 
1 1 
3. 
1 
1 
4. A has positive polarity 1 1 
5. 
= 
1 1 
6. 
  =   where   is speed of electron 
Alternatively: 
   = 
1 
1 
7. In point to point communication, communication takes place over a single link 
between a transmitter and a receiver.  
In the broadcast mode, there are a large number of receivers corresponding to a 
single transmitter. 
½ 
½ 
1 
8. With increase in temperature, the relaxation time ( average time between successive 
collisions) decreases  and hence resistivity increases. 
Alternatively: 
Resistivity     increases as  decreases with increase in temperature. 
1 
1 
9 
 
 
 
(i) According to Biot Savart’s law, the magnetic field due to a current element 
carrying current I at a point with position P vector  is given by 
 = 
1 
(i) Statement of Biot Savart’s law 1 
(ii) Expression for magnetic field ½ 
(iii) Showing field lines  ½ 
 Compartment Page No. 2 20th July, 2014 Final 
(ii) B = 
Field lines 
½ 
½ 
2 
10. 
 
 
a) An electromagnet consists of a core made of a ferromagnetic material placed
inside a solenoid. It behaves like a strong magnet when current flows through
the solenoid and effectively loses its magnetism when the current is switched
off.
(i) A permanent magnet is also made up of a ferromagnetic material but it 
retains its magnetism at room temperature for a long time after being 
magnetized once. 
b) 
(i) High permeability 
(ii) Low retentivity 
(iii)Low coercivity 
(Any two) 
[Note: Give ½ mark if the student just writes ‘soft iron’ is a suitable material for 
making electromagnets.] 
½ 
½ 
½+ ½ 
2 
11. 
Let P be the required point at  a distance x from charge q 
½ 
½ 
(a) Difference between a permanent magnet and an electromagnet ½ + ½ 
(b) Any two properties of material  ½ + ½ 
Formula  ½ 
Substitution and simplification 1 
Result  ½ 
 Compartment Page No. 3 20th July, 2014 Final 
 = 
   x=
required point is at a distance  from charge q 
Alternatively: 
2 =  or 
At distance d towards left of charge q
OR 
(i) We have W = 
 W = 
        = 
        = -2
(ii)    for 
Alternatively: 
½ 
½ 
½ 
½ 
½ 
½ 
½ 
½ 
1 
2 
2 
12. 
 
 
 
Difference between emf( ) and terminal voltage (v) 
terminal voltage 
1) It is the potential difference
between two terminals of the cells
when no current is drawn from it.
2) It is the cause.
1) It is the potential difference
between two terminals when
current passes through it.
2) It is the effect.
½ 
One difference between  and V ½ 
VI Graph ½ 
Determination of ‘r’ and  1 
(i) Work Done 1 
(ii) Orientation 1 
 Compartment Page No. 4 20th July, 2014 Final 
(Any one) or any other relevant difference 
Negative of slope gives internal resistance. 
1 
½ 2 
13. 
(i) For the AND gate: 
Truth Table Logic Symbol 
(ii) Output Waveform: 
½ +½ 
1 
2 
14. 
The condition for observing a rainbow are : 
i. The sun comes out after a rainfall.
ii. The observer stands with the sun towards his/her back. (any one)
½ 
½ 
(i) AND gate Truth Table ½ 
Logic symbol ½ 
(ii) Output waveform 1 
(a) Conditions ½ + ½ 
(b) Formation of rainbow 
     Diagram ½ 
Explanation ½ 
 Compartment Page No. 5 20th July, 2014 Final 
Formation of a rainbow: 
? The rays of light reach the observer through a refraction, followed by a 
reflection, followed by a refraction.  
? Figure shows red light, from drop 1 and violet light from drop 2, 
reaching the observers eye. 
½ 
½ 
2 
15. 
(i) 
(ii) 
½ 
     ½ 
½ + ½ 2 
16. 
½ 
½ 
1 2 
17. 
Flux through S
1
 , 
Flux through S
2
 ,  = 
Ratio of flux = 1:3 
No change in flux through S
1
 with dielectric medium inside the sphere S
2
 
½ 
½ 
 ½ 
½ 2 
(i) Source frequency – Formula ½ 
        Calculation and Result ½ 
(ii)       Quality Factor –Formula ½ 
-Calculation and Result ½ 
(ii)
De Broglie wavelength  ½ 
Calculation and Result 1½ 
Flux through S
1 
½ 
Flux through S
2
 ½ 
Ratio   ½ 
Flux through S
1
 with dielectric median ½
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