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Recent questions tagged ch14
Questions
Show that the statement " If $x$ is real number such that $x^3+4x=0$, then $x$ is 0." is true using contra positive method.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-5
sec-b
easy
q1-3
asked
Jul 26, 2014
by
rvidyagovindarajan_1
1
answer
Show that the statement " If $x$ is real number such that $x^3+4x=0$, then $x$ is 0." is true using contradiction method.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-5
sec-b
easy
q1-2
asked
Jul 26, 2014
by
rvidyagovindarajan_1
1
answer
Show that the statement " If $x$ is real number such that $x^3+4x=0$, then $x$ is 0." is true using direct method.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-5
sec-b
easy
q1-1
asked
Jul 25, 2014
by
rvidyagovindarajan_1
1
answer
For the statement "If a quadrilateral is a parallelogram then its diagonals bisect each other"' is the statement "If the diagonals of a quadrilateral bisecyt then it is a parallelogram" contra positive or converse?
cl51025
cl51021
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-4
sec-a
easy
q4-4
asked
Jul 22, 2014
by
rvidyagovindarajan_1
1
answer
For the statement "If a quadrilateral is a parallelogram then its diagonals bisect each other"' is the statement "If the diagonals of a quadrilateral do not bisect then it is not a parallelogram" contra positive or converse?
cl51021
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-4
sec-a
easy
q4-3
asked
Jul 22, 2014
by
rvidyagovindarajan_1
1
answer
For the statement "If you live in Delhi then you have winter clothes.' is the statement "If you have winter clothes then you live in Delhi" contra positive or converse?
cl51021
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-4
sec-a
easy
q4-2
asked
Jul 22, 2014
by
rvidyagovindarajan_1
1
answer
For the statement "If you live in Delhi then you have winter clothes.' is the statement "If you do not have winter clothes then you do not live in Delhi" contra positive or converse?
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-4
sec-a
easy
q4-1
asked
Jul 22, 2014
by
rvidyagovindarajan_1
1
answer
Write the statement "To get 'A' in the class it is necessary that you do all the exercises of the book." in 'if-then' form.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-4
sec-a
easy
q3-4
asked
Jul 22, 2014
by
rvidyagovindarajan_1
1
answer
Write the statement "A quadrilateral is a parallelogram if its diagonals bisect each other" in 'if-then' form.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-4
sec-a
easy
q3-3
asked
Jul 22, 2014
by
rvidyagovindarajan_1
1
answer
Write the statement " The banana tree will bloom if it stays warm for a month.' in 'if-then' form
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-4
sec-a
easy
q3-2
asked
Jul 22, 2014
by
rvidyagovindarajan_1
1
answer
Write the statement "You get a job implies that your credentials are good" in 'if-than' form.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-4
sec-a
easy
q3-1
asked
Jul 22, 2014
by
rvidyagovindarajan_1
1
answer
Write the converse and contra positive statements of the statement "$x$ is an even number implies that $x$ is divisible by $4$.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-4
sec-b
easy
q2-5
asked
Jul 21, 2014
by
rvidyagovindarajan_1
1
answer
Write the converse and contra positive statements of the statement "You cannot comprehend geometry if you do not know how to reason deductively."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-4
sec-b
easy
q2-4
asked
Jul 21, 2014
by
rvidyagovindarajan_1
1
answer
Write the converse and contra positive statements of the statement "Something cold implies that it has low temperature."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-4
sec-b
easy
q2-3
asked
Jul 21, 2014
by
rvidyagovindarajan_1
1
answer
Write the converse and contra positive statement of the statement " If the two lines are parallel then they do not intersect in the same plane."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-4
sec-b
easy
q2-2
asked
Jul 21, 2014
by
rvidyagovindarajan_1
1
answer
Write the contrapositive and converse of the statement: "If $x$ is prime then $x$ is odd."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-4
sec-b
easy
q2-1
asked
Jul 21, 2014
by
rvidyagovindarajan_1
1
answer
Rewrite the the statement " $If\: a\:natural\:number\:is\:odd,\: then\:its\:square\:is\:also\:odd."$ in five different ways conveying the same meaning.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-4
sec-b
easy
q1
asked
Jul 21, 2014
by
rvidyagovindarajan_1
1
answer
State whether 'or' used in the statement " All integers are positive or negative" is inclusive or or exclusive or. Give reason.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-3
sec-a
easy
q4-3
asked
Jul 16, 2014
by
rvidyagovindarajan_1
1
answer
State whether the 'or' in the statement "To apply for a driving licence, you should have a ration card or a passport." is inclusive or or exclusive or. Give reason.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-3
sec-a
easy
q4-2
asked
Jul 16, 2014
by
rvidyagovindarajan_1
1
answer
State whether 'or' used in the statement given "Sun rises or Moon sets" is exclusive or inclusive.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-3
sec-a
easy
q4-1
asked
Jul 16, 2014
by
rvidyagovindarajan_1
1
answer
Check whether the two statements given are negation of each other or not. Give reason " $p: x+y=y+x$ is true for every real number $x\:\:and\:\:y$. $q:$ There exists real numbers $x\:\:and\:\:y$ for which $x+y=y+x$.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-3
sec-a
easy
q3
asked
Jul 16, 2014
by
rvidyagovindarajan_1
1
answer
Identify the quantifier and and write the negation of the statement "There exists a capital for every state in India."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-3
sec-a
easy
q2-3
asked
Jul 16, 2014
by
rvidyagovindarajan_1
1
answer
Identify the quantifier and and write the negation of the statement "For every real number $x, \:\:x$ is less that $x+1$."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-3
sec-a
easy
q2-2
asked
Jul 16, 2014
by
rvidyagovindarajan_1
1
answer
Identify the quantifier and write the negation of the statement "There exists a number which is equal to its square."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-3
sec-a
easy
q2
1
asked
Jul 16, 2014
by
rvidyagovindarajan_1
1
answer
Identify the connecting word and and write the components of the statement "$x=2\:\:and\:\:x=3$ are the roots of the equation $3x^2-x-10=0$."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-3
sec-a
easy
q1-4
asked
Jul 16, 2014
by
rvidyagovindarajan_1
1
answer
Identify the connecting word and and write the components of the statement "The sand heats up quickly in the Sun and does not cool down fast at night"
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-3
sec-a
easy
q1-3
asked
Jul 16, 2014
by
rvidyagovindarajan_1
1
answer
Identify the connecting word and and write the components of the statement "Square of an integer is positive or negative."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-3
sec-a
easy
q1-2
asked
Jul 16, 2014
by
rvidyagovindarajan_1
1
answer
Identify the connecting word and and write the components of the statement "All rational numbers are real and all real numbers are not complex."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-3
sec-a
easy
q1-1
asked
Jul 16, 2014
by
rvidyagovindarajan_1
1
answer
Write the components of the statement "$100$ is divisible by $3,\:11$ and $5$ Also check whether it is true or false.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-2
sec-a
easy
q3-3
asked
Jul 14, 2014
by
rvidyagovindarajan_1
1
answer
Write the component of the compound statement "All integers are positive or negative." Also check whether it is true of false.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-2
sec-a
easy
q3-2
asked
Jul 14, 2014
by
rvidyagovindarajan_1
1
answer
Write the components of the compound statement "Number $3$ is prime or it is odd" and also find whether it is true or false.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-2
sec-a
easy
q3-1
asked
Jul 14, 2014
by
rvidyagovindarajan_1
1
answer
Are the pair of statements "The number $x$ is a rational number." and "The number $x$ is an irrational number." negation of each other?
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-2
sec-a
easy
q2-2
asked
Jul 14, 2014
by
rvidyagovindarajan_1
1
answer
Are the pair of statements "The number $x$ is not a rational number." and "The number $x$ is not an irrational number." negation of each other?
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-2
sec-a
easy
q2-1
asked
Jul 14, 2014
by
rvidyagovindarajan_1
1
answer
Write the negation of "Every natural number is an integer."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-2
sec-a
easy
q1-5
asked
Jul 14, 2014
by
rvidyagovindarajan_1
1
answer
Write the negation of "The number $2$ is greater than the number $7$."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-2
sec-a
easy
q1-4
asked
Jul 14, 2014
by
rvidyagovindarajan_1
1
answer
Write the negation of "All triangles are not equilateral triangle."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-2
sec-a
easy
q1-3
asked
Jul 14, 2014
by
rvidyagovindarajan_1
1
answer
Write the negation of "$\sqrt 2$ is not a complex number."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-2
sec-a
easy
q1-2
asked
Jul 14, 2014
by
rvidyagovindarajan_1
1
answer
Write the negation of "Chennai is the capital of Tamil Nadu."
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-2
sec-a
easy
q1-1
asked
Jul 14, 2014
by
rvidyagovindarajan_1
1
answer
Selenium (Se) is a group VI element (i.e. two columns to the right of Silicon on the periodic table). An extrinsic semiconductor is produced by doping Silicon (Si) with 1020 Selenium atoms per m3. Assuming saturation, calculate the conductivity of the extrinsic semiconductor.
jeemain
physics
class12
ch14
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
difficult
asked
Jul 13, 2014
by
balaji.thirumalai
1
answer
Given $n_i = 2.4 \times 10^{19} m^{-3}, \; \mu_n = 0.39\;m^2/V.S, \; \mu_p = 0.19\;m^2/V.s$ for intrinsic Ge at room temperature of $300^{\circ}\;K$, calculate the conductivity of the sample.
jeemain
physics
class12
ch14
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
easy
asked
Jul 13, 2014
by
balaji.thirumalai
1
answer
Estimate the conductivity ($\sigma_i$) and resistivity ($\rho_i$) of silicon atoms and electron-hole pairs at room temperature of $300^{\circ}\;K$ if every 10-millionth silicon atom is replaced by an atom of Indium.
cl50131
jeemain
physics
class12
ch14
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
difficult
asked
Jul 13, 2014
by
balaji.thirumalai
1
answer
Estimate the intrinsic conductivity ($\sigma_i$) and resistivity ($\rho_i$) of silicon atoms and electron-hole pairs at room temperature of $300^{\circ}\;K$.
jeemain
physics
class12
ch14
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
medium
asked
Jul 13, 2014
by
balaji.thirumalai
1
answer
C, Si and Ge atoms have 4 Valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by $E_C, E_{Si}, E_{Ge}$ respectively. Which of the following relationship is true in their case?
cl50123
jeemain
physics
class12
ch14
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
easy
asked
Jul 13, 2014
by
balaji.thirumalai
1
answer
Which of the following statements about intrinsic semiconductors are incorrect?
cl50123
jeemain
physics
class12
ch14
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
easy
asked
Jul 13, 2014
by
balaji.thirumalai
1
answer
Suppose a pure Si crystal has $5 \times 10^{28} \text{atoms} / m^3$. It is doped by 1 ppm concentration of pentavalent As. Calculate the number of electrons and holes, given that $n_i = 1.5 \times 10^{16} \;/m^3$
cl50123
jeemain
physics
class12
ch14
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
easy
asked
Jul 13, 2014
by
balaji.thirumalai
1
answer
A semiconductor has an electron concentration of $0.45 \times 10^{22} \; /m^3$ and a hole concentration of $5 \times 10^{20} \;/ m^3$. Find its conductivity.
jeemain
physics
class12
ch14
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
medium
asked
Jul 13, 2014
by
balaji.thirumalai
1
answer
A p type semiconductor has acceptor level of 57 mev above the valance band. Find the maximum wave length of light which can create a hole.
cl25422
jeemain
physics
class12
unit19
ch14
q9
easy
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
asked
Jul 13, 2014
by
balaji.thirumalai
1
answer
Give three examples of sentences which are not statements. Give reason.
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-1
sec-a
easy
q2
asked
Jul 4, 2014
by
rvidyagovindarajan_1
1
answer
'All real numbers are complex numbers.' Is this sentence a statement? How?
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-1
sec-a
easy
q1-10
asked
Jul 4, 2014
by
rvidyagovindarajan_1
1
answer
'Today is a windy day.' Is this sentence a statement? why?
cbse
class11
ch14
mathematical-reasoning
bookproblem
exercise14-1
sec-a
easy
q1-9
asked
Jul 4, 2014
by
rvidyagovindarajan_1
1
answer
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