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Recent questions tagged sec-b
Questions
The generative cell of two - celled pollen divides in the pollen tube but not in a three celled poll
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-b
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
Why does the zygote begin to divide only after the division of Primary Endosperm Cell?
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-b
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
Does self incompatibility impose any restrictions on autogamy? Give reasons and suggest method of po
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-b
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
Does self incompatibility impose any restrictions on autogamy? Give reasons and suggest method of po
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-b
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
<div>What is the function of two male gametes produced by each pollen grain in angiosperms?</div>
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-b
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
How is pollination carried out in water plants?
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-b
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
Which is a triploid tissue in a fertilized ovule? How is triploid condition achieved?
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-b
sexual reproduction in plants
asked
Jun 12, 2017
by
pady_1
1
answer
Justify the statement 'Vegetative reproduction is also a type of asexual reproduction'.
cbse
class12
ch1
exemplar
theoryquestion
biology
sec-b
reproduction in organisms
asked
Jun 12, 2017
by
pady_1
1
answer
Is it possible to consider vegetative propagation observe in certain plants like Bryophyllum, water
cbse
class12
ch1
exemplar
theoryquestion
biology
sec-b
reproduction in organisms
asked
Jun 12, 2017
by
pady_1
1
answer
Which of the following are monoeciuos and dieocious organisms?
cbse
class12
ch1
exemplar
theoryquestion
biology
sec-b
reproduction in organisms
asked
Jun 11, 2017
by
pady_1
1
answer
Is there a relationship between the size of an organism and its life span ? Give two examples in sup
cbse
class12
ch1
exemplar
theoryquestion
biology
sec-b
reproduction in organisms
asked
Jun 11, 2017
by
pady_1
1
answer
Although potato tuber is an underground part, it is considered as a stem. Give two reasons.
cbse
class12
ch1
exemplar
theoryquestion
biology
sec-b
reproduction in organisms
asked
Jun 11, 2017
by
pady_1
1
answer
In haploid organism that undergo sexual reproduction, name the stage in the life cycle when meiosis
cbse
class12
ch1
exemplar
theoryquestion
biology
sec-b
reproduction in organisms
asked
Jun 11, 2017
by
pady_1
1
answer
In haploid organism that undergo sexual reproduction, name the stage in the life cycle when meiosis
cbse
class12
ch1
exemplar
theoryquestion
biology
sec-b
reproduction in organisms
asked
Jun 11, 2017
by
pady_1
1
answer
A parallel plate capacitor with air between the plates has a capacitance of $8\;pF$ . The separation between the plates is now reduced by half and the space between them is filled with a medium of dielectric constant 5. Calculate the value of capacitance of the capacitor in the second case .
cbse
class12
physics
ch-2
sec-b
additional
medium
asked
Jan 3, 2017
by
meena.p
1
answer
Figure shows two identical capacitors $C_1$ and $C_2$ , each of $2 \mu F$ capacitance , connected to a battery of $5\;V$ . initially switch 'S' is closed . After some times S is left open and dielectric slabs of dielectric constant $K=5$ are inserted to fill completely the space between the plates of the two capacitors . How will the charge and potential difference between the plates of the capacitors be affected after the slab are inserted ?
electrostatic-potential-and-capacitance
sec-b
asked
Jan 3, 2017
by
meena.p
1
answer
A test charge q is moved without a acceleration from A to C along the path from A to B and then from B to C in electric field E as shown in the figure . Calculate the potential difference between A and C
cbse
class12
physics
ch-2
sec-b
medium
asked
Jan 3, 2017
by
meena.p
1
answer
Two charges $2\mu C$ and $-2 \mu C$ are placed at points A and B, 5cm apart . Depict an equipotential surface of the system
cbse
class12
physics
ch-2
sec-b
additional
medium
asked
Jan 3, 2017
by
meena.p
1
answer
A system consisting of two charges $7 \mu C$ and $–2 \mu C$ placed at $(–9 cm, 0, 0)$ and $(9 cm, 0, 0)$ respectively
cbse
class12
physics
ch-2
sec-b
ncert
medium
asked
Jan 3, 2017
by
meena.p
1
answer
In a hydrogen atom, the electron and proton are bound at a distance of about 0.53 Å: Estimate the potential energy of the system in eV, taking the zero of the potential energy at infinite separation of the electron from proton.
cbse
class12
physics
ch-2
sec-b
additional
medium
asked
Jan 2, 2017
by
meena.p
1
answer
Determine the electrostatic potential energy of a system consisting of two charges $7 \mu C$ and $–2 \mu C$ (and with no external field) placed at $(–9 cm, 0, 0)$ and $(9 cm, 0, 0)$ respectively.mple 2.5 (a) Determine the electrostatic potential energy of a system consisting of two charges 7 µC and –2 µC (and with no external field) placed at (–9 cm, 0, 0) and (9 cm, 0, 0) respectively.Suppose that the same system of charges is now placed in an external electric field $E = A (1/r^2); A = 9 \times 10^5 C m^{–2}$. What would the electrostatic energy of the configuration be?
cbse
class12
physics
ch-2
sec-b
ncert
medium
asked
Jan 2, 2017
by
meena.p
1
answer
The plates of a parallel plate capacitor have an area of $90\; cm^2$ each and are separated by $2.5\; mm$. The capacitor is charged by connecting it to a $400\; V$ supply.How much electrostatic energy is stored by the capacitor?
cbse
class12
physics
ch-2
sec-b
additional
medium
asked
Jan 2, 2017
by
meena.p
1
answer
A spherical capacitor has an inner sphere of radius 12 cm and an outer sphere of radius 13 cm. The outer sphere is earthed and the inner sphere is given a charge of $2.5 \mu C$. The space between the concentric spheres is filled with a liquid of dielectric constant $32$. What is the potential of the inner sphere?
cbse
class12
physics
ch-2
sec-b
additional
medium
asked
Jan 2, 2017
by
meena.p
1
answer
A spherical capacitor has an inner sphere of radius 12 cm and an outer sphere of radius 13 cm. The outer sphere is earthed and the inner sphere is given a charge of $2.5 \mu C$. The space between the concentric spheres is filled with a liquid of dielectric constant $32$. Determine the capacitance of the capacitor.
cbse
class12
physics
ch-2
sec-b
additional
medium
asked
Jan 2, 2017
by
meena.p
1
answer
In a Van de Graaff type generator a spherical metal shell is to be a $15 × 10^6\; V$ electrode. The dielectric strength of the gas surrounding the electrode is $5 × 10^7 \;Vm^{−1}$. What is the minimum radius of the spherical shell required?
cbse
class12
physics
ch-2
sec-b
additional
medium
asked
Jan 2, 2017
by
meena.p
1
answer
A spherical conductor of radius $12\; cm$ has a charge of $1.6 \times 10^{−7}\;C$ distributed uniformly on its surface. What is the electric field just outside the sphere ?
cbse
class12
physics
ch-2
sec-b
additional
medium
asked
Jan 2, 2017
by
meena.p
1
answer
A charge of $8\; mC$ is located at the origin. Calculate the work done in taking a small charge of $−2 \times 10^{−9}\; C$ from a point $P (0, 0, 3 \;cm)$ to a point $Q (0, 4 \;cm, 0)$, via a point $R (0, 6cm, 9 cm)$.
cbse
class12
physics
ch-2
sec-b
additional
medium
asked
Jan 2, 2017
by
meena.p
1
answer
Two charges $2 \mu C$ and $−2 \mu C$ are placed at points A and B 6 cm apart. (a) Identify an equipotential surface of the system. (b) What is the direction of the electric field at every point on this surface?
cbse
class12
physics
ch-2
sec-b
ncert
medium
asked
Jan 1, 2017
by
meena.p
1
answer
A regular hexagon of side $10\; cm$ has a charge $5 \;\mu C$ at each of its vertices. Calculate the potential at the centre of the hexagon.
cbse
class12
physics
ch-2
sec-b
ncert
medium
asked
Jan 1, 2017
by
meena.p
1
answer
Consider a metal ring kept (supported by a cardboard) on top of a fixed solenoid carrying a current $I$ as shown in the fig : The centre of the ring coincides with the axis of the solenoid. If the current in the solenoid is switched off, What happens to the ring ?
cbsc
class12
physics
electromagnetic-induction
sec-b
exemplar
difficult
asked
Jan 1, 2017
by
priyanka.c
1
answer
Consider a metal ring kept on top of a fixed solenoid (say on a cardboard) as shown in the figure. The centre of the ring coincides with the axis of the solenoid. If the current is suddenly switched on, the metal ring jumps up. Explain.
cbsc
class12
physics
electromagnetic-induction
sec-b
exemplar
difficult
asked
Dec 31, 2016
by
priyanka.c
1
answer
A solenoid is connect to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid, will the current increases or decreases ? Explain ?
cbsc
class12
physics
electromagnetic-induction
sec-b
exemplar
medium
asked
Dec 31, 2016
by
priyanka.c
1
answer
A wire in the form of a tightly wound solenoid is connected to DC source, and carries a current. If the coil is stretched so that spiral coil, will the current increases or decreases ? Explain.
(a) the current drawn from the d.c source increases
(b) the current drawn from d.c source decreases
(c) the current drawn first increases and then decreases
(d) the current drawn first decreases and then increases
cbsc
class12
physics
electromagnetic-induction
sec-b
exemplar
medium
asked
Dec 31, 2016
by
priyanka.c
1
answer
Consider a magnet surrounded by a wire with an on/off switch as shown in the fig. If the switch is thrown from the off position (open circuit) to the on position (closed circuit) will a current flow in the circuit ? Explain.
(a) Yes
(b) No
(c) Cannot be determine
(d) information not sufficient
cbsc
class12
physics
electromagnetic-induction
sec-b
exemplar
medium
asked
Dec 31, 2016
by
priyanka.c
1
answer
A loop, made of straight edges has six corner at A(0, 0, 0), B(L, 0, 0), C(L, L, O), D(O, L,O), E(O, L, L) and F (0, 0, L). A magnetic field $B = B_o(\hat{i} + \hat{k})T$ is present in the region.
The flux passing through the loop ABCDEFA (in that order) is $(a)B_oL^2Wb$ $(b)2B_oL^2Wb$ $(c)\sqrt 2B_oL^2Wb$ $(d)4B_oL^2Wb$
cbsc
class12
physics
electromagnetic-induction
sec-b
exemplar
medium
asked
Dec 31, 2016
by
priyanka.c
1
answer
Evaluate the induced $emf$ in the loop if the wire carries a current of 50A and the loop has an instantaneous velocity $v = 10 m/s$ at the location $x= 0.2 m,$ as shown, Take $a = 0.1$ and assume that the loop has a large resistance.
cbsc
class12
physics
electromagnetic-induction
sec-b
ncert
medium
asked
Dec 31, 2016
by
priyanka.c
1
answer
Figure shows a metal rod PQ resting on the smooth rail AB and positioned between the poles of a permanent magnet. The rail, the rod and the magnetic field are in three mutual perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = $9.0 m \Omega$. Assume the field to be uniform.
Suppose K is open and the rod is moved with a speed of 12cm/s in the direction shown. Give the polarity and magnitude of the induced $emf$.
cbsc
class-12
physics
electromagnetic-induction
sec-b
ncert
medium
asked
Dec 31, 2016
by
priyanka.c
1
answer
In a common emitter transistor amplifier , the output resistance is $500 \;k \Omega$ and the current gain $\beta =49$ . If the power gain of the amplifier is $5 \times 10^6$, the input resistance is
cbse
class12
physics
ch-14
sec-b
additional
medium
asked
Dec 31, 2016
by
meena.p
1
answer
In a transistor $\beta=49$ , then what percentage of charge carriers from emitter reach the collector ?
cbse
class12
physics
ch-14
sec-b
additional
medium
asked
Dec 31, 2016
by
meena.p
1
answer
In p-n junction diode , the current I , can be expressed $I= I_0 exp \bigg[ \large\frac{eV}{K_{B}T}-1 \bigg]$ Where $I_0$ is called the satiation current , V is the voltage across the dicode and in positive for forward bias and negative for reverse bias and I is the current through the dicode , $K_B$ is the Boltzmann constant $(8.6 \times 10^{-5}e^v/k)$ and T is the absolute temperature . If for a given diode $I_0 = 5 \times 10^{-12}A $ and $T=300\;K$ , then what will be the increase in the current if the voltage across the diode is increased to $0.7\;A$?
cbse
class12
physics
ch-14
sec-b
ncert
medium
asked
Dec 30, 2016
by
meena.p
1
answer
In p-n junction diode , the current I , can be expressed $I= I_0 exp \bigg[ \large\frac{eV}{K_{B}T}-1 \bigg]$ Where $I_0$ is called the satiation current , V is the voltage across the dicode and in positive for forward bias and negative for reverse bias and I is the current through the dicode , $K_B$ is the Boltzmann constant $(8.6 \times 10^{-5}e^v/k)$ and T is the absolute temperature . If for a given diode $I_0 = 5 \times 10^{-12}A $ and $T=300\;K$ , then what will be the forward current at a forward voltage of $0.6\;V$?
cbse
class12
physics
ch-14
sec-b
ncert
difficult
asked
Dec 30, 2016
by
meena.p
1
answer
In an intrinsic semiconductor the energy gap $E_g$ is $1.2\;ev$ . It hole mobility and independent of temperature . What is the ratio between conductivity at $600\;k$ and $300\;k$ Assume that the temperature dependence intrinic concentration $n_i$ is given by $n_i = n_0 exp\bigg(\large\frac{-Eg}{2K_b t}\bigg)$, Where $n_o$ is a Constant and $K_b= 8.62 \times 10^{-5} ev/K$
cbse
class12
physics
ch-14
sec-b
ncert
difficult
asked
Dec 30, 2016
by
meena.p
1
answer
A pair of adjacent coils have a mutual inductance of 1.5 H. If the current in one is changed from $0 \; to\; 20 A$ is $0.5 S$ , what is the change of flux with the other coil.
cbsc
class12
physics
electromagnetic-induction
sec-b
ncert
medium
asked
Dec 30, 2016
by
priyanka.c
1
answer
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