Physics Class 12th Sample Paper Sa1
NCS/SA-1st/11-12/XII/Physics/70
Total Pages 4
FIRST SUMMATIVE ASSESSMENT : 2011-12
Subject : PHYSICS Time : 3 hrs.
General Instructions:
(i) (ii) (iii) All questions are compulsory. There are 30 questions in total. Questions 1 to 8 carry 1 mark each, 9 to 18 carry 2 marks each, 18 to 27 carry 3 marks and 28 to 30 carry 5 marks each. Use of calculator is not permitted.
Class : XIIth
M.M. : 70
1. 2. 3.
What does q1 + q2 = 0 signify in electrostatics ?
1
In Bohr's model of hydrogen atom, the electron moves around the nucleus in a circular orbit of radius 5x10–11 m. Its time period is 1.5x10–16 second. Find current associated with the electron motion. 1
E I B C
A
4. 5.
Two heater wires of equal lengths are first connected in series and then in parallel. Find ratio of heat produced in two cases. 1
tu
In the circuit shown in fig. the resistances P and R are unequal. If the reading of the galvanometer remains the same with switch S open or closed, then what is the value of current through galvanometer ? 1
di es
IP IR P
w .s
to
V
B Q
HS
w
A
da y
D
C G D
w
R
6. 7. 8. 9.
How will the magnetic field intensity at the centre of a circular coil carrying current change, if the current through the coil is doubled and the radius of the coil is halved ? 1 Define eddy current. What is the ratio of speed of gamma rays and radiowaves in vacuum ? Prove that energy stored in a parallel plate capacitor is 1/2 CV2. 1 1 2
DOWNLOADED FROM WWW.STUDIESTODAY.COM
DOWNLOADED FROM WWW.STUDIESTODAY.COM
.c
om
Form the graph between current (I) and voltage (V) as shown in the figure, identify the portion corresponding to negative resistance. 1
DOWNLOADED FROM WWW.STUDIESTODAY.COM
DOWNLOADED FROM WWW.STUDIESTODAY.COM
NCS/SA-1st/11-12/XII/Physics/70
Page 2
10.
S1 and S2 are two parallel concentric spheres enclosing charges Q and 2Q respectively as shown in fig.
2Q 2 Q1 S1 S2
(a) (b)
Total Pages 4
FIRST SUMMATIVE ASSESSMENT : 2011-12
Subject : PHYSICS Time : 3 hrs.
General Instructions:
(i) (ii) (iii) All questions are compulsory. There are 30 questions in total. Questions 1 to 8 carry 1 mark each, 9 to 18 carry 2 marks each, 18 to 27 carry 3 marks and 28 to 30 carry 5 marks each. Use of calculator is not permitted.
Class : XIIth
M.M. : 70
1. 2. 3.
What does q1 + q2 = 0 signify in electrostatics ?
1
In Bohr's model of hydrogen atom, the electron moves around the nucleus in a circular orbit of radius 5x10–11 m. Its time period is 1.5x10–16 second. Find current associated with the electron motion. 1
E I B C
A
4. 5.
Two heater wires of equal lengths are first connected in series and then in parallel. Find ratio of heat produced in two cases. 1
tu
In the circuit shown in fig. the resistances P and R are unequal. If the reading of the galvanometer remains the same with switch S open or closed, then what is the value of current through galvanometer ? 1
di es
IP IR P
w .s
to
V
B Q
HS
w
A
da y
D
C G D
w
R
6. 7. 8. 9.
How will the magnetic field intensity at the centre of a circular coil carrying current change, if the current through the coil is doubled and the radius of the coil is halved ? 1 Define eddy current. What is the ratio of speed of gamma rays and radiowaves in vacuum ? Prove that energy stored in a parallel plate capacitor is 1/2 CV2. 1 1 2
DOWNLOADED FROM WWW.STUDIESTODAY.COM
DOWNLOADED FROM WWW.STUDIESTODAY.COM
.c
om
Form the graph between current (I) and voltage (V) as shown in the figure, identify the portion corresponding to negative resistance. 1
DOWNLOADED FROM WWW.STUDIESTODAY.COM
DOWNLOADED FROM WWW.STUDIESTODAY.COM
NCS/SA-1st/11-12/XII/Physics/70
Page 2
10.
S1 and S2 are two parallel concentric spheres enclosing charges Q and 2Q respectively as shown in fig.
2Q 2 Q1 S1 S2
(a) (b)