SUMMATIVE ASSESSMENT -1 (2015-2016)
CLASS- XII SC.
PHYSICS SET-1
F.M- 70
GENERAL INSTRUCTIONS
1. ALL QUESTION ARE COMPULSORY
2. THERE ARE 26 QUESTIONS IN ALL. QUESTIONS 1 TO 5 CARRY ONE MARK EACH. QUESTIONS6 TO10 CARRY
2 MARKS EACH. QUESTIONS 11 TO 22 CARRY 3 MARKS EACH . QUESTION23 IS A VALUE BASED QUESTION
CARRY 4 MARKS AND QUESTIONS 24
1.WHAT IS THE
TO 26 CARRY 5 MARKS EACH.
ELECTRIC POTENTIAL DUE TO AN ELECTRIC DIPOLE AT AN EQUATORIAL POINT?
2. DEFIN THE TERM ELECTRIC FLUX.
3.WHAT IS THE NATURE OF THE MAGNETIC FIELD IN MOVING COIL GALVANOMETER?
4. WHEN ARE THE VOLTAGE AND CURRENT IN LCR SERIES AC CIRCUIT IN PHASE?
5.NAME TWO PHENOMENA , WHICH ESTABLISH THE WAVE NATURE OF LIGHT.
6.DEFINE SELF INDUCTANCE
AND GIVE ITS S.I. UNIT.
7. NAME TWO DEVICES FOR ORODUCING PLANE POLARISED LIGHT.
8. WHAT ARE EDDY CURRENT ? WRITE TWO APPLICATIONS
OF EDDY CURRENTS.
9. HOW DOES THE RESOLVING POWER OF A TELESCOPE CHANGE WHEN THE APERTURE OF ITS
OBJECTIVE IS DECREASED?
10. GIVE ANY TWO CHARACTERISTICS OF ELECTROMAGNETIC
11. WHAT IS A CHOKE
WAVES.
COIL ? WHAT IS ITS USE?
12.WHY MICROWAVES ARE USED IN RADAR?
13. EXPLAIN DOMAIN THEORY OF
DIAMAGNETISM.
14. STATE AMPERE’S CIRCUITAL LAW MODIFIED BY MAXWELL . ALSO STATE MAXWELL EQUATIONS.
15. ESTABLISH THE RELATION BETWEEN DRIFT VELOCITY AND CURRENT.
16.WHAT ARE OPTICAL FIBRES ? MENTION THEIR TWO PRACTICAL APPLICATIONS .
17. DRAW A NEAT LABELLED DIAGRAM OF AN ASTRONOMICAL TELESCOPE. EXPLAIN ITS WORKING BRIEFLY.
18. PROVE THAT ENERGY STORED IN AN INDUCTOR IS ½ LI2, WHERE ‘ L’ IS INDUCTANCE AND ‘ I’
IN THE INDUCTOR.
19. MENTION THREE
DIFFERENCES BETWEEN INTERFERENCE AND DIFFRACTION OF LIGHT.
IS CURRENT
20. ESTABLISH THE RELATION BETWEEN RELATIVE MAGNETIC PERMEABILITY AND MAGNETIC SUSCEPTIBILITY.
21.DEDUCE CONDITION OF BALANCE OF A WHEATSTONE
DIAGRAM .
BRIDGE WITH A NEAT LABELLED CIRCUIT
22. A LONG SOLENOID WITH 15 TURNS PERCM. HAS A SMALL LOOP OF
AREA
2 CM2
PLACED INSIDE THE SOLENOID
NORMAL TO ITS AXIS . IF THE CURRENT CARRIED BY THE SOLENOID CHANGES STEADILY FROM 2A
TO
4A IN 0.1S . WHAT IS THE INDUCED EMF IN THE LOOP
23.SURYA PARTICIPATED IN A
IN THE
WHILE THE CURRENT IS CHANGING?
GROUP DISCUSSION IN HIS SCHOOL ON “ HUMAN EYE AND ITS DEFECTS”
EVENING HE NOTICED THAT HIS FATHER IS READING A BOOK BY PLACING IT AT A DISTANCE
OF 50CM. OR MORE FROM HIS EYE . HE ADVICED HIM FOR HIS EYE CHECK UP.
A) NAME THE VALUES DISPLAYED BY SURYA.
B) WHAT WILL BE THE POWER OF THE READING SPECTACLE FOR HIM, SO THAT HE MAY EASILY READ THE BOOK
PLACED AT 25CM. FROM EYE?
24. DRAW A LABELLED DIAGRAM OF A STEP DOWN TRANSFORMER. STATE ITS PRINCIPLE AND WORKING. WRITE ONE
MAIN CAUSE OF ENERGY LOSS IN THIS DEVICE AND THE METHOD USED FOR REDUCING IT.
25. STATE HUYGEN’S PRINCIPLE . WITH THE HELP OF A SUITABLE DIAGRAM , PROVE SNELL’S LAW OF REFRACTION
USING HUYGEN’S PRINCIPLE.
26. A SILVER WIRE HAS A RESISTANCEOF 2.1 Ω.AT 27.5OC
AND A RESISTANCE OF 2.7Ω. AT
100 OC . DETERMINE THE TEMPERATURE COEFFICIENT OF RESISTIVITY OF SILVER.
SUMMATIVE
CLASS-XII
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•
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ASSESSMENT-1
SUB;- PHYSICS (SET-2)
(2015-16)
F.M- 70
GENERAL INSTRUCTIONS:ALL QUESTIONS ARE COMPULSORY.
THERE ARE 26 QUESTIONS INALL . QUESTION 1TO5 CARRY 1 MARK EACH , QUESTION 6 TO 10 CARRY 2
MARKS EACH , QUESTION 11 TO 22 CARRY 3 MARKS EACH , QUESTION 23 IS A VALUE BASED QUESTION
CARRY 4 MARKS AND QUESTION 24 TO 26 CARRY 5 MARKS EACH.
1.WHAT
ARE SUPER CONDUCTORS?
2.WHAT DO YOU MEAN BY DISPLACEMENT CURRENT?
3.WHAT IS THE POWER FACTOR OF LCR SERIES CIRCUIT AT
4. STATE THE ESSENTIAL CONDITION
RESONANCE?
FOR DIFFRACTION OF LIGHT TO TAKE PLACE?
5. EXPRESS DIELECTRIC CONSTANT IN TERMS OF CAPACITANCE?
6. WHAT IS WATTLESS CURRENT?
7. DEFINE THE
TERM MUTUAL INDUCTANCE AND GIVE ITS S.I. UNIT.
8. ACONVEX LENS IS HELD IN WATER. WHAT CHANGES WILL YOU EXPECT
9. LIGHT
IN ITS FOCAL LENGTH?
WAVES CAN BE POLARISED, WHILE SOUND WAVES CANNOT, WHY?
10. WHY DO WE PREFER A POTENTIOMETER TO MEASURE THE E.M.F. OF A CELL
RATHER THAN A
VOLTMETER?
11. PROVE
IS ½ CV
2
THAT ELECTROSTATIC ENERGY STORED IN A PARALLEL PLATE CAPACITOR
.
12. EXPLAIN
DOMAIN THEORY OF PARAMAGNETISM .
13. WHAT IS INDUCED E.M.F. ? WRITE FARADEY’S
LAW OF ELECTROMAGNETIC INDUCTION .
EXPRESS
IT MATHEMATICALLY.
14. WHICH CONSTITUENT RADIATION
(I) IN
OF THE ELECTROMAGNETIC SPECTRUM IS USED
RADAR
(II) TO PHOTOGRAPH
INTERNAL PARTS OF A HUMAN BODY AND
(III)FOR TAKING PHOTOGRAPH OF THE SKY
15. HOW DOES THE
DURING NIGHT AND FOGGY CONDITIONS.
RESISTIVITYOF (I) CONDUCTOR AND (II) SEMICONDUCTOR VARY WITH TEMPERATURE?
16. DERIVE THE LENS FORMULA
17. DERIVE A FORMULA
WHICH GIVES RELATION BETWEEN U, V, AND F IN CASE OF A CONVEX LENS .
FOR THE FORCE BETWEEN TWO PARALLEL CONDUCTORS CARRYING CURRENT IN THE
OPPOSITE DIRECTIONS AND WRITE THE NATURE OF THE FORCE.
18. DERIVE
AN EXPRESSION FOR (I) INDUCED E.M.F.
AND (II) INDUCED
CURRENT WHEN A CONDUCTOR
OF LENGTH ‘L’ IS MOVED WITH A UNIFORM VELOCITY ‘V’ NORMAL TO A UNIFORM MAGNETIC FIELD ‘B’.
ASSUME THE RESISTANCE OF THE CONDUCTOR TO BE ‘R’
19. OBTAIN AN EXPRESSION FOR THE MAGNETIC
RADIUS ‘R’ AND MOVING WITH A SPEED ‘V’.
20. NAME THE
.
MOMENT OF AN ELECTRON IN A CIRCULAR ORBIT OF
ELEMENTS OF THE EARTH’S MAGNETIC FIELD AT A PLACE .
21. A PARALLEL PLATE CAPACITOR
EXPLAIN THEIR MEANING.
WITH AIR BETWEEN THE PLATES HAS A CAPACITANCE OF 8 PF. WHAT
WILL BE THE CAPACITANCE IF THE DISTANCE BETWEEN THE PLATES IS REDUCED BY HALF AND THE
SPACE BETWEEN THEM IS FILLED WITH A SUBSTANCE OF DIELECTRIC CONSTANT
22. WHAT ARE COHERENT
6?
SOURCES ? WHY ARE COHERENT SOURCES REQUIRED TO PRODUCED
INTERFERENCE OF LIGHT?
23. ONE DAY
CHETAN’S MOTHER DEVELOPED A SEVERE STOMACH ACHE ALL OF A SUDDEN.
SHE WAS RUSHED TO THE DOCTOR WHO SUGGESTED FOR AN IMMIDIATE ENDOSCOPY TEST AND GAVE AN
ESTIMATE OF EXPENDITURE FOR THE SAME.
CHETAN
IMMIDIATELY CONTACTED HIS CLASSTEACHER
AND SHARED THE INFORMATION WITH HER. THE CLASS TEACHER ARRANGED FOR THE MONEY AND RUSHED TO
THE HOSPITAL. ON REALIZING THAT CHETAN BELONGED TO A BELOW AVERAGE INCOME GROUP FAMILY, THE
DOCTOR OFFERED
(I)
(II)
CONCESSION FOR THE TEST FEE.
THE TEST WAS CONDUCTED
WHICH PRINCIPLE OF OPTICS IS MADE USE OF ENDOSCOPY?
BRIEFLY EXPLAIN THE VALUES REFLECTED IN THE ACTION TAKEN
24. WHAT IS MEANT
BY IMPEDANCE?
SUCCESSFULLY.
BY THE TEACHER.
GIVE ITS UNIT USING A PHASOR DIAGRAM
DERIVE THE EXPRESSION
FOR THE IMPEDANCE OF A A.C. CIRCUIT CONTAINING L,C AND R IN SERIES. FIND THE EXPRESSION FOR
THE RESONANT FREQUENCY.
25. DRAW A RAY DIAGRAM
SHOWING THE PASSAGE OF LIGHT THROUGH A GLASS PRISM. HENCE OBTAIN A
RELATION BETWEEN THE ANGLE OF DEVIATION , INCIDENCE, EMERGENCE AND ANGLE OF PRISM.
26. A 4.5 CM. NEEDLE IS PLACED 12 CM. AWAY FROM A CONVEX
GIVE THE LOCATION OF THE IMAGE
IS
AND THE MAGNIFICATION .
MOVED FARTHER FROM THE MIRROR.
MIRROR OF FOCAL LENGTH
DESCRIBE
15 CM.
WHAT HAPPENS AS THE NEEDLE