G.A.V PUBLIC SCHOOL
HOLIDAY HOMEWORK - 2017 Class XII ENGLISH
I.
Attempt all questions.
Q1. You want to sell your house at 15 Rajendra Nagar, New
Delhi. Draft an advertisement in not more than 50 words,
giving the necessary details, to be published in the classified
columns of ‘The New India Express.’ You are Krishna/Alka.
Q2. You are Anuj, a social activist. Design a poster to observe
‘Wildlife Protection Week’ in your city, in 50 words.
Q3. Spurt of violence previously unknown in Indian schools
makes it incumbent on the educationists to introduce value
education effectively in schools. Write an article in 150-200
words expressing your views on the need of value education.
You are Anu/Aditya.
II.
The Invisible Man Read the prescribed novel, ‘The Invisible
Man.’ Attempt the following questions.
Q1. Draw a pen portrait of Dr. Kemp and contrast him with
Griffin.
Q2. Do you consider Marvel a smart turncoat? Why/Why not?
Q3. ‘Science is a threat to humanity.’ Comment on the
statement in context of The Invisible Man.
III. Read the newspaper every day. Cut out 10 classified ads for
(1) For sale (property, vehicle, household goods)
(2) To LET
(3) Lost and Found
(4) Situation Vacant (single vacancy)
(5) Change of name Paste 2 of each kind on one page in the writing
skills notebook.
GAV PUBLIC SCHOOL
MATHS ASSIGNMENT
CLASS XII (MATHS)
SOLVE NCERT EXERCISES IN SEPARATE NOTEBOOK OF FOLLOWING CHAPTERS
1. MATRICES AND DETERMINANTS
2. CONTINUITY AND DIFFERENTIABILITY
3. INVERSE TRIGONOMETRY
PURCHASE NCERT EXEMPLAR AND SOLVE THE FOLLOWING CHAPTERS IN
DIFFERENT NOTEBOOK. IT WILL BE EVALUATED FOR FINAL ASSESSMENT IN
BOARD PRACTICALS.
GAV PUBLIC SCHOOL
GURUGRAM
CLASS XII (CHEMISTRY)
(DO NCERT TEXT AND INTEXT QUESTION OF SOLID STATE)
(DO NCERT TEXT AND INTEXT QUESTION OF ALCOHALS ,PHENOLS AND ETHERS)
(PRACTISE THE GIVEN ASSIGNMENT)
GAV PUBLIC SCHOOL
GURUGRAM
CLASS XII (BIOLOGY HOLIDAY HOMEWORK)
1. Revise chapter 1 & 2
2. Explain Various stages of meiosis and mitosis
3. With the help of neat labeled diagram explain the
structure of flowers
4. List out the various pollen products as food
supplement
GAV PUBLIC SCHOOL
GURUGRAM
CLASS-XII (PHYSICS)
Q1. A 5V battery with internal resistance 2Ω and a 2V battery with internal resistance 1Ω are connected
to a 10Ω resistor as shown in fig.
The current in the 10Ω resistor is
(a)0.27A,P2 to P1
(b)0.03A,P1 to P2
(c)0.03A, P2 to P1
(d)0.27A, P1 to P2
Q2. The resistance of a wire is 5 at 50oC and 6 at 100oC. The resistance of the wire at 0oC will
(a)2
(b)1
(c)4
(d)3
Q3. In the figure shown the current through 2Ω resistor is
(a)2A
(b)0A
(C)4A
(d)6A
Q4. A galvanometer has resistance 100Ω and it requires 100µA for full scale deflection. A resistor 0.1Ω is
connected to make it an ammeter. The smallest current required in the circuit to produce the full scale
deflection is
(a)1000.1mA
(b)1.1mA
(c)10.1mA
(d)100.1mA
Q5. A resistance of 2Ω is connected across one gap of a metre-bridge (the length of the wire is 100cm)
and an unknown resistance, greater than 2Ω, is connected across the other gap. When these resistances
are interchanged, the balance point shifts by 20cm. neglecting any corrections, the unknown resistance
is
(a)3 Ω
(b)4 Ω
(c)5 Ω
(d)6 Ω
Q6. Figure shows three resistor configurations R1,R2,R3 connected to 3V battery. If the power dissipated
by the configuration R1,R2 and R3 is P1,P2, and P3 respectively, then
(a)P1>P2>P3
(b)P1>P3>P2
(c)P2>P1>P3
(d)P3>P2>P1
Q7.STATEMENT 1- In a meter bridge experiment, null point for an unknown resistance is measured.
Now, the unknown resistance is put inside an enclosure maintained at a higher temperature. The null
point can be obtained at the same point as before by decreasing the value of the standard resistance
and
STATEMENT 2- Resistance of a metal with increase In temperature.
(a)statement 1 is true, statement 2 is true; statement -2 is correct explanation for statement-1
(b)statement-1 is true, stataement-2 is true; statement 2 is NOT correct explanation for statement-1
(c)statement-1 is true, statement-2 is false
(d)statement-1 is false, statement-2 is true
Q8.two wires each of radius of cross section r but of different materials are connected together end to
end (in series). If the densities of charge carriers in the two wires are in the ratio 1:4, the drift velcoity of
electrons in the two wires will be in the ratio:
(a)1:2
(b)2:1
(c)4:1
(d)1:4
Q9. An insulating pipe of cross section area ’A’ contains an electrolyte which has two types of ions→their
charges being –e and +2e. a potential difference applied between the ends of the pipe result in the
drifting of the two types of ions, having drift speed=v(-ve ion) and v/4(+ve ion). Both ions have the same
number per unit volume=n. the current flowing through the pipe is
(a)nevA/2
(b)neAv/4
(c)5neAv/2
(d)3neAv/2
Q10. A current I flows through a uniform wire of diameter d when the mean electron drift velocity is v.
the same current will flow through a wire of diameter d/2 made of the same material if the mean drift
velocity of the electron is:
(a)v/4
(b)v/2
(c)2v
(d)4v
Q11. A wire has a non-uniform cross-section as shown in the fig. a steady current flows through it. The
drift speed of electrons at points P and Q is vp and vq
(a) vp = vq
(b) vp < vq
(c) vp > vq
(d)data insufficient
Q12. A uniform copper wire carries a current i amperes and has p carriers per metre3. The length of the
wire is l metres and its cross-section area is s metre2. If the charge on a carrier is q coulombs, the drift
velocity in ms-1 is given by
(a)i/lsq
(b)i/psq
(c)psq/I
(d)i/pslq
Q13. The current in a metallic conductor is plotted against voltage at two different temperatures T1 and
T2. Which is correct
(a)T1>T2
(b) T1<T2
(c) T1=T2
(d) none
Q14. A storage battery is connected to a charger with a voltage of 12.5 volts. The internal resistance of
the storage battery is 1Ω. When the charging current is 0.5A, the emf of the storage battery is
(a)13volts
(b)12.5volts
(c)12volts
(d)11.5volts
Q15. Under what conditions current passing through the resistance R can be increased by short
circuiting the battery of emf E2. The internal resistances of the two batteries are r1 and r2
(a)E2r1>E1(R+r1)
(b) E1r2>E2(R+r1)
(c) E2r2>E1(R+r2)
(d) E1r1>E2(R+r1)
Q16. A battery consists of a variable number n of identical cells having internal resistance connected in
series. The terminals of the battery are short circuited and the current I is measured. Which one of the
graph below shows the relationship between I and n?
(a)
(b)
(c)
(d)
(e)
Q17. In previous problem, if the cell had been connected in parallel (instead of in series) which of the
above graphs would have shown the relationship between total current I and n?
(a)
Q18. In the shown, battery 1 has emf =6V and internal resistance=1Ω. Battery 2 has emf=2V and internal
resistance=3Ω. The wires have negligible resistance. What is the potential difference across the
terminals of the battery 2?
(a)4V
(b)1.5V
(c)5V
(d)0.5V
Q19. A circuit is comprised of eight identical batteries and a resistor R=0.8Ω. each battery has an emf of
1.0V and internal resistance of 0.2Ω. the voltage difference across any of the battery is
(a)0.5V
(b)1.0V
(c)0V
(d)2V
Q20. A wire of length L and 3 identical cells of negligible internal resistances are connected in series. Due
to the current, the temperature of the wire is raised by ∆𝑇 in time t. N number of similar cells is now
connected in series with a wire of the same material and cross section but of length 2L. the temperature
of the wire is raised by the same amount ∆𝑇 in the same time t. the value of N is:
(a)4
(b)6
(c)8
(d)9
Q21. A wire of cross section area A, length L1, resistivity ρ1 and temperature coefficient of resistivity α1 is
connected to a second wire of length L2, resistivity ρ2, temperature coefficient of resistivity α2 and the
same area A, so that wire carries same current. Total resistance R is independent of temperature for
small temperature change if(thermal expansion effect is negligible)
(a)α1=-α2
(b)ρ1α1L1 + ρ2α2L2=0
(c)L1α1+ L2α2=0
(d)none
Q22. Resistances R1 and R2 each of 60Ω are connected in series as shown in fig. the potential difference
between A and B is kept 120volt. Then what will be the reading of voltmeter connected between the
point C and D if resistance of voltmeter is 120Ω.
(a)48V
(b)24V
(c)40V
(d)none
Q23. Consider an infinite ladder network shown in figure. A voltage V is applied between points A and B.
this applied value of voltage is halved after each section
(a)R1/R2=1
(b) R1/R2=1/2
(c) R1/R2=2
(d) R1/R2=3
Q24. In the given circuit the current flowing through the resistance 20 ohms is 0.3 ampere while the
ammeter reads 0.8 ampere. What is the value of R1?
(a)30ohms
(b)40ohms
(c)50ohms
(d)60ohms
Q25. A brass disc and a carbon disc of same radius are assembled alternatively to make a cylindrical
conductor. The resistance of the cylinder is independent of the temperature the ratio of thickness of the
brass disc to that of the carbon disc is [α is temperature coefficient of resistance & neglect linear
expansion] and [] means modulus
(a)[αCρC/αBρB]
(b)[ αCρb/αBρc]
(c)[ αbρC/αcρB]
(d)[ αbρb/αcρc]
Q26. In the circuit shown, what is the potential difference Vpq?
(a)+3V
(b)+2V
(c)-2V
(d)none
Q27. In the circuit shown in figure reading of voltmeter is V1 when only S1 is closed, reading of voltmeter
is V2 when only S2 is closed. The reading of voltmeter is V3 when both S1 and S2 are closed then
(a)V2>V1>V3
(b) V3>V2>V1
(c) V3>V1>V2
(d) V1>V2>V3
Q28. One end of a nichrome wire of length 2L and cross-sectional area 2A. if the free end of the longer
wire is at an electric potential of 8 volts, and free end of the shorter wire is at an electric potential of
1volt, the potential at the junction of the two wires is equal to
(a)2.4V
(b)3.2V
(c)4.5V
(d)5.6V
Q29. In the diagram resistance between any two junctions is R. equivalent resistance across terminals A
and B is
(a)11R/7
(b)18R/11
(c)7R/11
(d)11R/18
Q30 Power generated across a uniform wire connected across a supply is H. if the wire is cut into n equal
parts and all the parts are connected in parallel across the same supply, the total power generated in
the wire is
(a)H/n2
(b)n2H
(c)nH
(d)H/n
Q31. When electric bulbs of same power, but different marked voltage are connected in series across
the power line, their brightness will be:
(a)proportional to their marked voltage
(b)inversely proportional to their marked voltage
(c)proportional to the square of their marked voltage (d)
(d)inversely proportional to the square of their marked voltage
Q32. In the circuit shown in figure, find the amount of heat generated when the switch S is closed?
Q33. Find the capacitance of the system shown in figure
Q34.A circuit is connected as shown in the figure with the switch S open. When the switch is closed, the
total amount of charge that flows from Y to X?
Q35. The capacitance (C) for an isolated conducting sphere of radius (a) is given by 4 a. if the sphere is
enclosed with an earthed concentric sphere. The ratio of the radii of the spheres being n/(n-1) then the
capacitance of such a sphere will be increased by a factor
(a)n
(b)n/(n-1) (c)(n-1)/n (d)a.n
Q36. Let C be the capacitance of a capacitor discharging through a resistor R. suppose t1 is the time
taken for the energy stored in the capacitor to reduce to half its initial value and t2 is the time taken for
the charge to reduce to one-fourth its initial value. Then the ratio t1/t2 will be
(a)1
(b)1/2
(c)1/4
(d)2
Q37 A parallel plate capacitor with air between the plates has a capacitance of 9pF. The separation
between the plates is d. the space between the plates is now filled with two dielectrics. One of the
dielectric has dielectric constant K1=3 and thickness d/3 while the other one has dielectric constant k2=6
and thickness 2d/3. Capacitance of the capacitor is now
(a)1.8pF
(b)45pF
(c)40.5pF
(d)20.25pF
Q38 A battery is used to charge a parallel plate capacitor till the potential difference between the plates
becomes equal to the electromotive force of the battery. The ratio of the energy stored in the capacitor
and the work done by the battery will be
(a)1
(b)2
(c)1/4
(d)1/2
Q39. A parallel plate condenser with a dielectric of dielectric constant K between the plates has capacity
C and is charged to a potential V volt. The dielectric slab is slowly removed from between the plates and
then reinserted. The net work done by the system in this process is
(a) 1(K-1)/2CV2
(b)CV2(K-1)/K
(c)(K-1)CV2
(d)zero
Q40. Two insulating plates are both uniformly charged in such a way that the potential difference
between them is V2-V1=20V. The plates are separated by a distance d=0.1m and can be treated as
infinitely large. An electron is released from rest on the inner surface of plate 1. What is its speed when
it hits plate 2?
(a)2.65x106m/s (b)7.02x1012m/s
(c)1.87x106m/s (d)32x10-19m/s
Q41. A battery is used to charge a parallel plate capacitor till the potential difference between the plates
becomes equal to the electromotive force of the battery. The ration of the energy stored in the
capacitor and the work done by the battery will be
(a)1
(b)2
(c)1/4
(d)1/2
Electrostatics and electrostatic potential
Q42. consider the charges q,q and-q placed at the vertices of an equilateral triangle of side a. What is
the force on each charge?
Q43.Two particles each having a mass of 5g and charge 10-7 C stay in limiting equilibrium on a
horizontal table with a separation of 10cm between them. The coefficient of friction between each
particle and the table is same. Find the value of this coefficient?
Q44. Two similar and equally charged identical metal spheres A and B repel each other with a force of
2X10-5N. A third identical uncharged sphere C is touched with A and then placed at midpoint between A
and B. What is the net electric force on C?
Q45. Three charges –q, Q, -q are placed at equal distances on a straight line. If the potential energy of
the system of three charges is zero, then what is the ratio of Q:q?
Q46. Three capacitors of capacitances 2μF, 3μF, 6μF are connected in series with a 12V battery. All the
connecting wires are disconnected. The three positive plates are connected together and the three
negative plates are connected together. Find the charges on the three capacitors after the
reconnection?
Q47. Find the equivalent capacitance of the combination of capacitors between the points A and B as
shown in fig. also calculate the total charge that flows in the circuit when a 100V battery is connected
between the points A and B? All capacitances are in µF
Q48. Two capacitors C1 and C2 are connected to a battery of 6V as shown in fig. find the charge on each
capacitor? Capacitances are in μF
Q49. Let P(r)= (Q/πR4)r be the charge density distribution of a solid sphere of radius R and total charge
Q. for a point P inside the sphere ay distance r1 from the centre of the sphere, the magnitude of the
electric field is
(a)zero
(b)Q/4π𝜀 or12
(c) Q r12/4π𝜀 oR4
(d) Qr12/3π𝜀 oR4
Q50. Two points P and Q are maintained at the potentials of 10V and -4V respectively. The work done in
moving 100 electrons from P to Q is
(a)-19x10-17J
(b)9.60x10-17J
(c)-2.24x10-16J
(d)2.24x10-16J
Q51. A charge Q is palced at each of the opposite corners of a square. A charge q is placed at each of the
other two corners. If the net electrical force on Q is zero, then Q/q equals
(a)-2√2
(b)-1
(c)1
(d)-1/√2
Q52. A thin spherical shell of radius R has charge Q spread uniformly over its surface. Which of the
following graphs most closely represents the electric field E(r) produced by the shell in the range 0<r<∞,
where r is the distance from the centre of the shell?
Q53. An electric charge 10-3µC is placed at the origin (0,0) of X-Y co-ordinate system. Two points A and
B are situated at (√2, √2) and (2,0) respectively. The potential difference between the points A and B
will be
(a)9V
(b)zero
(c)2V
(d)4.5V
Q54. Charges are placed on the vertices of a square as shown. Let E be the electric field and V the
potential at the centre. If the charges on A and B are interchanged with those on D and C respectively,
then
(a)E remains unchanged, V changes
(b)Both E and V change
(c)E and V remains unchanged
(d)E changes, V remains unchanged
Q55. The potential at a point x(measured in µm) due to some charges situated on the x-axis is given by
V(x)=20/(x2-4)volt. Then the electric field E at x=4 µm is given by
(a)5/3 in –ve x direction
(b)5/3 in the +ve x direction
(d)10/9 in the positive x direction
(c)10/9 in the –ve x direction