Physics Past Year Paper Compartment Anskey (Outside Delhi Set -2) - 2014, Class 12 Class 12 Notes | EduRev

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Class 12 : Physics Past Year Paper Compartment Anskey (Outside Delhi Set -2) - 2014, Class 12 Class 12 Notes | EduRev

 Page 1


 Compartment Page No. 1 20th July, 2014 Final 
MARKING SCHEME 
SET 55/2 (Compartment) 
Q.No. Expected Answer/Value Points Marks Total 
Marks 
1. 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 
2. 
  =   where   is speed of electron 
Alternatively: 
   = 
1 
1 
3. Radio, Television (Any one) 1 1 
4. 
1 
1 
5. Line B 
Since slope (q/V) of B is lesser than that of A. 
½ 
½ 1 
6. 
= 
1 1 
7. A has positive polarity 1 1 
8. Modulation Index is defined as the ratio of amplitude of modulating signal to the 
amplitude of carrier wave i.e.
1 1 
9 
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 
Flux through S
1 
½ 
Flux through S
2
 ½ 
Ratio   ½ 
Flux through S
1
 with dielectric median ½
Page 2


 Compartment Page No. 1 20th July, 2014 Final 
MARKING SCHEME 
SET 55/2 (Compartment) 
Q.No. Expected Answer/Value Points Marks Total 
Marks 
1. 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 
2. 
  =   where   is speed of electron 
Alternatively: 
   = 
1 
1 
3. Radio, Television (Any one) 1 1 
4. 
1 
1 
5. Line B 
Since slope (q/V) of B is lesser than that of A. 
½ 
½ 1 
6. 
= 
1 1 
7. A has positive polarity 1 1 
8. Modulation Index is defined as the ratio of amplitude of modulating signal to the 
amplitude of carrier wave i.e.
1 1 
9 
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 
Flux through S
1 
½ 
Flux through S
2
 ½ 
Ratio   ½ 
Flux through S
1
 with dielectric median ½
 Compartment Page No. 2 20th July, 2014 Final 
10. 
Let P be the required point at  a distance x from charge q 
 = 
   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 
½ 
½ 
1 
2 
2 
Formula  ½ 
Substitution and simplification 1 
Result  ½ 
(i) Work Done 1 
(ii) Orientation 1 
Page 3


 Compartment Page No. 1 20th July, 2014 Final 
MARKING SCHEME 
SET 55/2 (Compartment) 
Q.No. Expected Answer/Value Points Marks Total 
Marks 
1. 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 
2. 
  =   where   is speed of electron 
Alternatively: 
   = 
1 
1 
3. Radio, Television (Any one) 1 1 
4. 
1 
1 
5. Line B 
Since slope (q/V) of B is lesser than that of A. 
½ 
½ 1 
6. 
= 
1 1 
7. A has positive polarity 1 1 
8. Modulation Index is defined as the ratio of amplitude of modulating signal to the 
amplitude of carrier wave i.e.
1 1 
9 
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 
Flux through S
1 
½ 
Flux through S
2
 ½ 
Ratio   ½ 
Flux through S
1
 with dielectric median ½
 Compartment Page No. 2 20th July, 2014 Final 
10. 
Let P be the required point at  a distance x from charge q 
 = 
   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 
½ 
½ 
1 
2 
2 
Formula  ½ 
Substitution and simplification 1 
Result  ½ 
(i) Work Done 1 
(ii) Orientation 1 
 Compartment Page No. 3 20th July, 2014 Final 
11. 
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.
A permanent magnet is also made up of a ferromagnetic material but it
retains its magnetism at room temperature for a log time after being
magnetized once.
b) Properties
i. High permeability
ii. Low retentivity
iii. Low coercivity (Any two)
½ 
½ 
½ + ½ 
2 
12. 
    = 
=3.31 x 10
-12
m
1 
½ 
½ 2 
13. 
 
 
 
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.
(Any one) or any other relevant difference 
Negative of slope gives internal resistance. 
½ 
1 
½ 2 
a) Difference between electromagnet and permanent magnet 1
b) Properties of material (any two) ½ + ½ 
Formula  1 
Substitution and Calculation ½ 
Result  ½ 
One difference between  and V ½ 
VI Graph ½ 
Determination of ‘r’ and  1 
Page 4


 Compartment Page No. 1 20th July, 2014 Final 
MARKING SCHEME 
SET 55/2 (Compartment) 
Q.No. Expected Answer/Value Points Marks Total 
Marks 
1. 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 
2. 
  =   where   is speed of electron 
Alternatively: 
   = 
1 
1 
3. Radio, Television (Any one) 1 1 
4. 
1 
1 
5. Line B 
Since slope (q/V) of B is lesser than that of A. 
½ 
½ 1 
6. 
= 
1 1 
7. A has positive polarity 1 1 
8. Modulation Index is defined as the ratio of amplitude of modulating signal to the 
amplitude of carrier wave i.e.
1 1 
9 
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 
Flux through S
1 
½ 
Flux through S
2
 ½ 
Ratio   ½ 
Flux through S
1
 with dielectric median ½
 Compartment Page No. 2 20th July, 2014 Final 
10. 
Let P be the required point at  a distance x from charge q 
 = 
   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 
½ 
½ 
1 
2 
2 
Formula  ½ 
Substitution and simplification 1 
Result  ½ 
(i) Work Done 1 
(ii) Orientation 1 
 Compartment Page No. 3 20th July, 2014 Final 
11. 
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.
A permanent magnet is also made up of a ferromagnetic material but it
retains its magnetism at room temperature for a log time after being
magnetized once.
b) Properties
i. High permeability
ii. Low retentivity
iii. Low coercivity (Any two)
½ 
½ 
½ + ½ 
2 
12. 
    = 
=3.31 x 10
-12
m
1 
½ 
½ 2 
13. 
 
 
 
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.
(Any one) or any other relevant difference 
Negative of slope gives internal resistance. 
½ 
1 
½ 2 
a) Difference between electromagnet and permanent magnet 1
b) Properties of material (any two) ½ + ½ 
Formula  1 
Substitution and Calculation ½ 
Result  ½ 
One difference between  and V ½ 
VI Graph ½ 
Determination of ‘r’ and  1 
 Compartment Page No. 4 20th July, 2014 Final 
14. 
 
 
 
(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 
 = 
(ii) B = 
Field lines 
1 
½ 
½ 
2 
15. 
 
a) The minimum negative potential, applied on the collector plate, that makes
the photocurrent zero, is called the stopping potential.
b) 
1 
1 
2 
a) Definition of stopping potential 1 
b) Diagram / Plotting graph 1 
(i) Statement of Biot Savart’s law 1 
(ii) Expression for magnetic field ½ 
(iii) Showing field lines  ½ 
Page 5


 Compartment Page No. 1 20th July, 2014 Final 
MARKING SCHEME 
SET 55/2 (Compartment) 
Q.No. Expected Answer/Value Points Marks Total 
Marks 
1. 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 
2. 
  =   where   is speed of electron 
Alternatively: 
   = 
1 
1 
3. Radio, Television (Any one) 1 1 
4. 
1 
1 
5. Line B 
Since slope (q/V) of B is lesser than that of A. 
½ 
½ 1 
6. 
= 
1 1 
7. A has positive polarity 1 1 
8. Modulation Index is defined as the ratio of amplitude of modulating signal to the 
amplitude of carrier wave i.e.
1 1 
9 
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 
Flux through S
1 
½ 
Flux through S
2
 ½ 
Ratio   ½ 
Flux through S
1
 with dielectric median ½
 Compartment Page No. 2 20th July, 2014 Final 
10. 
Let P be the required point at  a distance x from charge q 
 = 
   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 
½ 
½ 
1 
2 
2 
Formula  ½ 
Substitution and simplification 1 
Result  ½ 
(i) Work Done 1 
(ii) Orientation 1 
 Compartment Page No. 3 20th July, 2014 Final 
11. 
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.
A permanent magnet is also made up of a ferromagnetic material but it
retains its magnetism at room temperature for a log time after being
magnetized once.
b) Properties
i. High permeability
ii. Low retentivity
iii. Low coercivity (Any two)
½ 
½ 
½ + ½ 
2 
12. 
    = 
=3.31 x 10
-12
m
1 
½ 
½ 2 
13. 
 
 
 
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.
(Any one) or any other relevant difference 
Negative of slope gives internal resistance. 
½ 
1 
½ 2 
a) Difference between electromagnet and permanent magnet 1
b) Properties of material (any two) ½ + ½ 
Formula  1 
Substitution and Calculation ½ 
Result  ½ 
One difference between  and V ½ 
VI Graph ½ 
Determination of ‘r’ and  1 
 Compartment Page No. 4 20th July, 2014 Final 
14. 
 
 
 
(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 
 = 
(ii) B = 
Field lines 
1 
½ 
½ 
2 
15. 
 
a) The minimum negative potential, applied on the collector plate, that makes
the photocurrent zero, is called the stopping potential.
b) 
1 
1 
2 
a) Definition of stopping potential 1 
b) Diagram / Plotting graph 1 
(i) Statement of Biot Savart’s law 1 
(ii) Expression for magnetic field ½ 
(iii) Showing field lines  ½ 
 Compartment Page No. 5 20th July, 2014 Final 
16. 
a) Truth Table Logic symbol 
b) 
½ + ½ 
1 
2 
17. 
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)
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 
½ 
½ 2 
a) Truth table for OR gate ½ 
Logic symbol for OR gate ½ 
b) Output waveform 1 
(a) Conditions ½ + ½ 
(b) Formation of rainbow 
     Diagram ½ 
Explanation ½ 
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