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Recent questions tagged class12

Intra Uterine Devices (IUDs) - copper releasing IUDs: (i) increase phagocytosis of sperms within the uterus (ii) the Cu ions released suppress sperm motility (iii) the Cu ions released suppress the fertilising capacity of sperms Regarding (i), (ii) and (iii):

asked Jan 6, 2014 by pady_1

1 answer

Region surrounding electric dipole

asked Jan 6, 2014 by meena.p

1 answer

The capacitance of parallel plate capacitor does not depend upon

asked Jan 6, 2014 by meena.p

3 answers

If a charge q is rotated around charge Q in a circle of radius y by $90^{\circ}$, the work done will be

asked Jan 6, 2014 by meena.p

1 answer

A and B are two events such that $ P(A) > 0, P(B) \neq 1$ then $ P( \overline A / \overline B )=$

asked Jan 6, 2014 by thanvigandhi_1

1 answer

A fair coin is tossed 100 times. The probability of getting tails on odd number of times is

asked Jan 6, 2014 by thanvigandhi_1

1 answer

Find the equivalent capacitance :

asked Jan 6, 2014 by meena.p

1 answer

Let A,B,C be three equally likely and collectively exhaustive events. If the odds 8 : 3 against A, 5:2 against B then the odds against C are

asked Jan 6, 2014 by thanvigandhi_1

1 answer

Equivalent capacity of parallel plate capacitor shown below is :

asked Jan 6, 2014 by meena.p

1 answer

The probability of guessing correctly atleast 8 out of 10 answers on a true - false examination is :

asked Jan 6, 2014 by thanvigandhi_1

1 answer

If $X$ follows a binomial distribution with parameters $n$ and $p$. $p \lt 0 \lt 1$ If $ P(X=r)/P(X=n-r)$ is independent of $ n \:$ and$\: r$ , then value of p is :

asked Jan 6, 2014 by thanvigandhi_1

1 answer

In the circuit shown below ; if 2000 v potential is given to point A, the potential at point B is :

asked Jan 6, 2014 by meena.p

1 answer

The plates of parallel plate capacitor of capacity $ 100 \mu F$ are charged to potential $100 v $and then seperated from each other so that distance between them is doubled. How much energy is spent in doing so ?

asked Jan 6, 2014 by meena.p

1 answer

The equation of the plane passing through the point $(1,1,1)$ and having direction ratios $b,c,a$ $(a < b < c)$, where $a,b,c$ are prime factors of $2001$ is ?

asked Jan 6, 2014 by rvidyagovindarajan_1

1 answer

If the vectors $\overrightarrow a+\lambda \overrightarrow b+3\overrightarrow c,\:-2\overrightarrow a+3\overrightarrow b-4\overrightarrow c\:and\:\overrightarrow a-3\overrightarrow b+5\overrightarrow c$ are coplanar and $\overrightarrow a,\overrightarrow b,\overrightarrow c$ are non coplanar, then $\lambda=?$

asked Jan 6, 2014 by rvidyagovindarajan_1

1 answer

A vector $\overrightarrow a$ is parallel to the line of intersection of planes $P_1$ containing vectors $\hat i,\:\hat i+\hat j$ and $P_2$ conataining vectors $\hat i-\hat j,\:\hat i+\hat k$. Then the angle between $\overrightarrow a$ and $\hat i-2\hat j+2\hat k$ is?

asked Jan 5, 2014 by rvidyagovindarajan_1

1 answer

The vectors $\overrightarrow a,\overrightarrow b,\overrightarrow c\:\overrightarrow d$ be are such that $(\overrightarrow a\times\overrightarrow b)\times (\overrightarrow c\times\overrightarrow d)=0$ and $P_1,\:P_2$ are two planes containing the pair of vectors $\overrightarrow a,\overrightarrow b$ and $\overrightarrow c,\overrightarrow d$ respectively, then the angle between the planes is ?

asked Jan 5, 2014 by rvidyagovindarajan_1

1 answer

If $\overrightarrow a,\overrightarrow b,\overrightarrow c$ are the sides $BC,CA\:and \:AB$ respectively of the $\Delta \:ABC$, then

asked Jan 5, 2014 by rvidyagovindarajan_1

1 answer

If $\overrightarrow a,\overrightarrow b,\overrightarrow c$ are three coplanar vectors then, $[(2\overrightarrow a-\overrightarrow b)\:(2\overrightarrow b-\overrightarrow c)\:(2\overrightarrow c-\overrightarrow a)]=?$

asked Jan 5, 2014 by rvidyagovindarajan_1

1 answer

The position vector of the vertices $A,B,C$ of a $\Delta\: ABC$ are $\hat i-\hat j-3\hat k,\:2\hat i+\hat j-2\hat k\:\:and\:\:-5\hat i+2\hat j-6\hat k$ respectively. The length of the bisector $AD$ of angle $A$ where $D$ is on the line $BC$ is ?

asked Jan 5, 2014 by rvidyagovindarajan_1

1 answer

The line joining the points $6\overrightarrow a-4\overrightarrow b-5\overrightarrow c$ and $-4\overrightarrow c$ and the line joining the points $-\overrightarrow a-2\overrightarrow b-3\overrightarrow c$ and $\overrightarrow a+2\overrightarrow b-5\overrightarrow c$ Intersects at the point ?

asked Jan 5, 2014 by rvidyagovindarajan_1

1 answer

A unit vector coplanar with the vectors $\hat i-\hat j\:\;and\:\:\hat i+2\hat j$ and is $\perp$ to the first vector, $\hat i-\hat j$ is ?

asked Jan 5, 2014 by rvidyagovindarajan_1

1 answer

If $\overrightarrow {OA}=\hat i+3\hat j-2\hat k\:\:and\:\:\overrightarrow {OB}=3\hat i+\hat j-2\hat k$ and $C$ is a point of $AB$ so that $\overrightarrow {OC}$ bisects the angle $AOB$, then $\overrightarrow {OC}=?$

asked Jan 5, 2014 by rvidyagovindarajan_1

1 answer

The equation of the plane having intercepts of $3$ and $4$ with $x$ and $z$ axes respectively and parallel to $y$ axis is ?

asked Jan 4, 2014 by rvidyagovindarajan_1

1 answer

If the lines $x=1+s,\:y=-3-\lambda s,\:z=1+\lambda s$ and $x=t/2,\:y=1+t,\:z=2-t$ with parameters $s\:and\:t$ respectively, are coplanar, then $\lambda=?$

asked Jan 4, 2014 by rvidyagovindarajan_1

1 answer

The equation of the plane containing the lines $\overrightarrow r=\overrightarrow a_1+\lambda\overrightarrow b\:\:and\:\:\overrightarrow r=\overrightarrow a_2+\mu\overrightarrow b$ is ?

asked Jan 4, 2014 by rvidyagovindarajan_1

1 answer

The equation of the plane that contains the line $\overrightarrow r=2\hat i+\lambda(\hat j-\hat k)$ and $\perp$ to the plane $\overrightarrow r.(\hat i+\hat k)=3$ is ?

asked Jan 4, 2014 by rvidyagovindarajan_1

1 answer

A die is thrown 4 times. The probability of getting at most two 6 is :

asked Jan 4, 2014 by thanvigandhi_1

1 answer

The equation of the plane through the point $(1,2,-1)$ and $\perp$ to the line of intersection of the planes $\overrightarrow r.(3\hat i-\hat j+\hat k)=1$ and $\overrightarrow r.(\hat i+4\hat j-2\hat k)=2$ is?

asked Jan 4, 2014 by rvidyagovindarajan_1

1 answer

If the chance that a ship will arrive safely at a port is $ \large\frac{9}{10}$, the chance that out of 5 ships expected to arrive at the port at least 4 will arrive safely is

asked Jan 4, 2014 by thanvigandhi_1

1 answer

A fair coin is tossed 10 times. The probability that the coin shows head exactly 4 times is

asked Jan 4, 2014 by thanvigandhi_1

1 answer

If the position vector of the points $A\:and\:B$ are $\hat i-\hat j+3\hat k$ and $3\hat i+3\hat j+3\hat k$ and the equation of a plane is $\overrightarrow r.(5\hat i+2\hat j-7\hat k)+9=0$, then the points $A\:and\:B$ are?

asked Jan 4, 2014 by rvidyagovindarajan_1

1 answer

The probability that England wins a cricket match against India is $ \large\frac{1}{3}$. If India and England play 3 test matches the probability that India will win exactly 2 test matches is

asked Jan 4, 2014 by thanvigandhi_1

1 answer

If on an average 2 ships in every 10, sinks. The probability that out of 5 ships expected to arrive, at least three will arrive safely is

asked Jan 3, 2014 by thanvigandhi_1

1 answer

A,B and C take one shot each at a target. Their probability of hitting the target are respectively 0.4, 0.5 and 0.8. The probability that at least two of them hit the target is

asked Jan 3, 2014 by thanvigandhi_1

1 answer

Three identical dice are rolled. The probability that the same number will appear on each of them is

asked Jan 3, 2014 by thanvigandhi_1

1 answer

Assertion (A): At puberty only 60,000-80,000 primary follicles are left in each ovary. Reason (R): A large number of primary follicles degenerate during the phase from birth to puberty. Regarding (A) and (R):

asked Jan 3, 2014 by pady_1

1 answer

Regarding Oogenesis choose the incorrect one :

asked Jan 3, 2014 by pady_1

1 answer

1. The seminal plasma along with the sperms constitute the semen. 2. The functions of male *** accessory ducts and glands are maintained by the testicular hormones (androgens). Regarding 1 and 2 :

asked Jan 3, 2014 by pady_1

1 answer

Middle piece of a sperm :

asked Jan 3, 2014 by pady_1

1 answer

Microscopic structure of a sperm is composed of

asked Jan 3, 2014 by pady_1

1 answer

Follicle stimulating hormone (FSH) :

asked Jan 3, 2014 by pady_1

1 answer

Luteinising hormone (LH) :

asked Jan 3, 2014 by pady_1

1 answer

The increased levels of GnRH :

asked Jan 3, 2014 by pady_1

1 answer

1. Spermatogenesis starts at the age of puberty due to significant increase in the secretion of gonadotropin releasing hormone (GnRH). 2. GnRH is a pituitary hormone.

asked Jan 3, 2014 by pady_1

1 answer

1. Each spermatogonium contains 46 chromosomes. 2. Secondary spermatocytes have 23 chromosomes each. Regarding 1 and 2 :

asked Jan 3, 2014 by pady_1

1 answer

The spermatogonia -

asked Jan 3, 2014 by pady_1

1 answer

The primary *** organs –

asked Jan 3, 2014 by pady_1

1 answer

1. The hymen is often torn during the first coitus. 2. However the presence or absence of hymen is not a reliable indicator of virginity or sexual experience. Regarding 1 and 2 :

asked Jan 3, 2014 by pady_1

1 answer

1. The opening of the ** is often covered partially by a membrane called hymen. 2. The is a tiny finger-like structure which lies at the upper junction of the two * minora below the urethral opening. Regarding 1 and 2 :

asked Jan 3, 2014 by pady_1

1 answer

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