Recent questions tagged class11

The distance of a point p from a point source of light $S_1$ is $100. 1243\;cm$ and from another point source $S_2$ is $100.1664\;cm$ Find $(S_2P-S_1P)$ and $(S_2P +S_1P)$ correct upto the same number of significant figures.

asked Jul 11, 2014 by meena.p

1 answer

Find the number of significant figures in the mass difference between a proton and a neutron. Given that mass of a proton $= 1.672649 \times 10^{27}$ mass of a neutron $= 1.674954 \times 10^{-27} kg$

asked Jul 11, 2014 by meena.p

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Find the value of the following expression : $\large\frac{5.3 \times 10^4 }{3.3 \times 10^{-2}} +$$ \sqrt { 1.6 \times 10^{12}}$

asked Jul 11, 2014 by meena.p

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If the volume of $1.32 \;kg$ of an iron ball is $0.17\;m^3$ find the density.

asked Jul 11, 2014 by meena.p

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What is the total length of a line where different segments measure $8.26\;cm,2.3\;cm,2.89\;cm$ and $7.762\;cm?$

asked Jul 11, 2014 by meena.p

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$ 0.000070 kg$ of ink is filled in a fountain pen of mass $0.0152 kg$ . What is the total mass of filled fountain pen ?

asked Jul 10, 2014 by meena.p

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What is the value of parallactic seconds (parsec) in S.I units?

asked Jul 10, 2014 by meena.p

1 answer

What is the value of a light year in SI Units?

asked Jul 10, 2014 by meena.p

1 answer

The time period of a sample pendulum is to be determined with the help of a stop clock having a least count of $ \large\frac{1}{3}$ seconds. If the estimated time period is about 2 second time for how many oscillations must be recorded so that the periodic time is determined with an error less than $0.67%$

asked Jul 10, 2014 by meena.p

1 answer

The measured mass and volume of a bosy are $2.42\; g$ and $4.8\; cm^3$ respectively. With possible errors 0.01 g and $0.1 cm^3$ the maximum error in density is about

asked Jul 10, 2014 by meena.p

1 answer

A cube is of edge $1.2 \times 10^{-2} m$. The volume of cube is

asked Jul 10, 2014 by meena.p

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What is the perimeter and area of a rectangle whose length is $6.01$ m and width is $1.2 m$

asked Jul 10, 2014 by meena.p

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If the unit of length is x metres in a new system of units (x > 1) then the numerical value of area in the new system of units will be how many times its numerical value in S. I?

asked Jul 10, 2014 by meena.p

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Parsec is a unit of

asked Jul 10, 2014 by meena.p

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A fermi is equivalent to

asked Jul 10, 2014 by meena.p

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Which of the following is not a unit of time

asked Jul 10, 2014 by meena.p

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The dimensional formula of magnetic flux is:

asked Jul 10, 2014 by balaji.thirumalai

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If E is the electric field intensity and $ \mu_0$ is the permeability of free space, then the quantity $\large\frac{E^2}{\mu_0}$ has the dimensions of

asked Jul 10, 2014 by balaji.thirumalai

1 answer

Light -year is a unit of

asked Jul 10, 2014 by meena.p

1 answer

One micron is equal to

asked Jul 10, 2014 by meena.p

1 answer

Match the question given under Column $C_1$ with their appropriate answer given under the Column $C_2$ for the following : The equation of the line through the intersection of the lines 2x – 3y = 0 and4x – 5y = 2 and

asked Jul 9, 2014 by thanvigandhi_1

1 answer

Match the question given under Column $C_1$ with their appropriate answer given under the Column $C_2$ for the following : The value of the $ \lambda$, if the lines $(2x + 3y + 4) +\lambda (6x – y + 12) = 0 $ are

asked Jul 9, 2014 by thanvigandhi_1

1 answer

Match the question given under Column $C_1$ with their appropriate answer given under the Column $C_2$ for the following :

asked Jul 9, 2014 by thanvigandhi_1

1 answer

State whether the following is true or false and justify : Line joining the points (3, – 4) and (– 2, 6) is perpendicular to the line joining the points (–3, 6) and (9, –18).

asked Jul 9, 2014 by thanvigandhi_1

1 answer

State whether the following statement is true or false and justify : The lines $ ax + 2y + 1 = 0, bx + 3y + 1 = 0 $ and $cx + 4y + 1 = 0$ are concurrent if a, b, c are in G.P

asked Jul 9, 2014 by thanvigandhi_1

1 answer

Calculate the mean deviation about the mean of the set of first n natural numbers where numbers where n is an even number.

asked Jul 9, 2014 by meena.p

1 answer

Match the following :

asked Jul 9, 2014 by sreemathi.v

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Calculate the mean deviation about the mean of the set of first n natural numbers when n is odd number.

asked Jul 9, 2014 by meena.p

1 answer

Match the proposed probability under Column $C_1$ with the appropriate written description under column $C_2$ :

asked Jul 9, 2014 by sreemathi.v

1 answer

The probability of happening of an event A is 0.5 and that of B is 0.3. If A and B are mutually exclusive events, then the probability of neither A nor B is ________.

asked Jul 9, 2014 by sreemathi.v

1 answer

If A and B are two events associated with a random experiment such that $P(A)=0.3,P(B)=0.2$ and $P(A \cap B)=0.1$ then the value of $P(A \cap \bar{B})$ is _________

asked Jul 9, 2014 by sreemathi.v

1 answer

Find the standard deviation of the first n natural numbers.

asked Jul 9, 2014 by meena.p

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The mean and standard deviation of a set of $n_1$ observations are $\bar{x_1}$ and $s_1$ respectively , while the mean and standard deviation of another set of $n_2$ observations are $x_2$ and $s_2$ respectively. Show that the standard deviation of the combined set of $(n_1+n_2)$ observations is given by $ S.D= \sqrt {\large\frac{n_1 (s_1)^2 +n_2 (s_2)^2}{n_1+n_2} +\frac{n_1n_2(\bar {x_1} -\bar {x_2} )^2}{(n_1+n_2)^2}}$

asked Jul 9, 2014 by meena.p

1 answer

Let S={1,2,3,4,5,6} and E={1,3,5},then $\bar{E}$ is_________.

asked Jul 9, 2014 by sreemathi.v

1 answer

If $e_1,e_2,e_3,e_4$ are the four elementary outcomes in a sample space and $P(e_1) = .1, P(e_2) = .5, P (e_3) = .1$, then the probability of $e_4$ is ______.

asked Jul 9, 2014 by sreemathi.v

1 answer

The probability that the home team will win an upcoming football game is 0.77, the probability that it will tie the game is 0.08, and the probability that it will lose the game is _____________

asked Jul 9, 2014 by sreemathi.v

1 answer

True-or-False : The sum of probabilities of two students getting distinction in their final examinations is 1.2

asked Jul 9, 2014 by sreemathi.v

1 answer

True-or-False : The probability of an occurrence of event A is 0.7 and that of the occurrence of event B is 0.3 and the probability of occurrence of both is 0.4.

asked Jul 9, 2014 by sreemathi.v

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True-or-False : The probability of intersections of two events A and B is always less than or equal to those favorable to the event A.

asked Jul 9, 2014 by sreemathi.v

1 answer

True-or-False : If A and B are two candidates seeking admission in an engineering college.The probability that A is selected is 0.5 and the probability that both A and B are selected is at most 0.3.Is it possible that the probability of B getting selected is 0.7?

asked Jul 9, 2014 by sreemathi.v

1 answer

True-or-False : The probabilities that a typist will make 0,1,2,3,4,5 or more mistakes in typing a report are,respectively,0.12,0.25,0.36,0.14,0.08,0.11

asked Jul 9, 2014 by sreemathi.v

1 answer

True-or-False : The probability that a student will pass his examination is 0.73,the probability of the student getting a compartment is 0.13,and the probability that the student will either pass or get compartment is 0.96.

asked Jul 9, 2014 by sreemathi.v

1 answer

State whether the following statement is true or false and justify : The equation of the line joining the point (3, 5) to the point of intersection of the lines $4x + y – 1 = 0 $ and $7x – 3y – 35 = 0$ is equidistant from the points (0, 0) and (8, 34)

asked Jul 9, 2014 by thanvigandhi_1

1 answer

The standard deviation is __________ the mean deviation taken from the arithematic mean

asked Jul 9, 2014 by meena.p

1 answer

The mean deviation of the data is ________ when measured from the median .

asked Jul 9, 2014 by meena.p

1 answer

True-or-False : The probability that a person visiting a zoo will see the giraffee is 0.72,the probability that he will see the bears is 0.84 and the probability that he will see both is 0.52.

asked Jul 9, 2014 by sreemathi.v

1 answer

The sum of the squares of the deviations of the values of the variable is _______ when taken about their arithmetic mean.

asked Jul 9, 2014 by meena.p

1 answer

The standard deviation of data is _ of any change in origin, but is ______ on the change of scale.

asked Jul 9, 2014 by meena.p

1 answer

If M and N are any two events,the probability that at least one of them occurs is

asked Jul 9, 2014 by sreemathi.v

1 answer

If the variance of a data is 121, then the standard deviation of the data is _______

asked Jul 9, 2014 by meena.p

1 answer

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