Email
Chat with tutors
Login
Ask Questions, Get Answers
Menu
X
home
ask
tuition
questions
practice
papers
mobile
tutors
pricing
X
Recent questions tagged difficult
Questions
If $nC_{r-1}=36,nC_r=84$ and $nC_{r+1}=126$ then find $rC_2$
cbse
math
class11
ch7
permutations-and-combinations
exercise7-3
exemplar
q15
sec-c
difficult
asked
May 15, 2014
by
sreemathi.v
1
answer
A box contain two white,three black and four red balls. In how many ways can three balls be drawn from the box,if atleast one black ball is to be includedin the draw
cbse
math
class11
ch7
permutations-and-combinations
exercise7-3
exemplar
q14
sec-c
difficult
asked
May 15, 2014
by
sreemathi.v
1
answer
Out of 18 points in a plane,no three are in the same line except five points which are collinear.Find the number of lines that can be formed joining the points
cbse
math
class11
ch7
permutations-and-combinations
exercise7-3
exemplar
q4
sec-c
difficult
asked
May 15, 2014
by
sreemathi.v
1
answer
A candidate is required to answer 7 questions out of 12 questions,which are divided into two groups,each containing 6 questions. He is not permitted to attempt more than 5 questions from either group. Find the number of different ways of doing questions.
cbse
math
class11
ch7
permutations-and-combinations
exercise7-3
exemplar
q3
sec-c
difficult
asked
May 15, 2014
by
sreemathi.v
1
answer
Eight chairs are numbered 1 to 8. Two women and 3 men wish to occupy one chair each. First the women choose the chairs from amongst the chairs 1 to 4 and then men select from the remaining chairs. Find the total number of possible arrangements.
cbse
math
class11
ch7
permutations-and-combinations
exercise7-3
exemplar
q1
sec-c
difficult
asked
May 14, 2014
by
sreemathi.v
1
answer
From a class of 25 students 10 are to be chosen for an excursion party.There are 3 students who decide that either all of them will join or none of them will join.In how many ways can the excursion party be chosen?
cbse
math
class11
bookproblem
ch7
permutations-and-combinations
misc
q10
sec-c
difficult
asked
May 14, 2014
by
sreemathi.v
1
answer
In an examination a question paper consists of 12 questions divided into two parts (i.e) Part I and Part II.Containing 5 and 7 questions respectively.A student is required to attempt 8 question in all,selecting at least 3 from each part.In how many ways can a student select the questions 2
cbse
math
class11
bookproblem
ch7
permutations-and-combinations
misc
q7
sec-c
difficult
asked
May 14, 2014
by
sreemathi.v
1
answer
The English alphabet has 5 vowels and 21 consonants.How many words with two different vowels and two different consonants can be formed from the alphabet?
cbse
math
class11
bookproblem
ch7
permutations-and-combinations
misc
q6
sec-c
difficult
asked
May 14, 2014
by
sreemathi.v
1
answer
If the different permutations of all the letters of the word EXAMINATION are listed as in dictionary,how many words are there in this list before the first word starting with E?
cbse
math
class11
bookproblem
ch7
permutations-and-combinations
misc
q4
sec-c
difficult
asked
May 14, 2014
by
sreemathi.v
1
answer
How many words with or without meaning can be formed with letters of the word EQUATION at a time so that vowels and consonants occur together?
cbse
math
class11
bookproblem
ch7
permutations-and-combinations
misc
q2
sec-c
difficult
asked
May 14, 2014
by
sreemathi.v
1
answer
How many words,with or without meaning,each of 2 vowels and 3 consonants can be formed from the letters of the word DAUGHTER?
cbse
math
class11
bookproblem
ch7
permutations-and-combinations
misc
q1
sec-c
difficult
asked
May 14, 2014
by
sreemathi.v
1
answer
In how many ways can the letters of the word PERMUTATIONS be arranged if the There are always $4$ letters between $P$ and $S$?
cbse
math
class11
bookproblem
ch7
permutations-and-combinations
exercise7-3
q11-iii
sec-c
difficult
asked
May 13, 2014
by
sreemathi.v
1
answer
If $p$ and $q$ are the lengths of perpendiculars from the origin to the lines $ x \cos \theta - y \sin \theta = k \cos 2\theta$ and $ x \sec \theta + y \: cosec \theta -k$, respectively, prove that $ p^2+4q^2=k^2$
cbse
class11
ch10
straight-lines
bookproblem
exercise10-3
sec-c
q16
difficult
asked
May 13, 2014
by
thanvigandhi_1
1
answer
Find the 4-digit numbers that can be formed using the digits 1,2,3,4,5 if no digit is repeated.How many of will be even?
cbse
math
class11
bookproblem
ch7
permutations-and-combinations
exercise7-3
q4
sec-c
difficult
asked
May 13, 2014
by
sreemathi.v
1
answer
Two lines passing through the point (2,3) intersects each other at an angle of $60^{\circ}$. If slope of one line is 2, find equation of the other line.
cbse
class11
ch10
straight-lines
bookproblem
exercise10-3
sec-c
q12
difficult
asked
May 13, 2014
by
thanvigandhi_1
1
answer
Prove that the line through the point $(x_1, y_1)$ and parallel to the line $Ax+By+C=0$ is \[\] $\qquad \qquad A(x-x_1)+B(y-y_1)=0$.
cbse
class11
ch10
straight-lines
bookproblem
exercise10-3
sec-c
q11
difficult
asked
May 13, 2014
by
thanvigandhi_1
1
answer
Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Internal energy of a gas must increase when temperature is increased}\\\text{Reason:Internal energy is a function of velocity of gas.}\end{array}$
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:A substance existing in the gaseous state at a temperature below its critical temperature is called a vapour and can be liquified by the application of pressure done.Above the critical temperature liquefaction is not possible by compression of gas and it is called a gas}\\\text{Reason:A triple point is the pressure and temperature point for a substance where all its 3 states coexist.}\end{array}$
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:The ratio }\large\frac{C_P}{C_V}\normalsize \text{ is more for helium than hydrogen.}\\\text{Reason:Atomic mass of helium is more than hydrogen.}\end{array}$
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
A tube sealed at both ends is 100cm long.It lies horizontally,the middle 0.1m containing mercury & 2 ends containing air at standard atmospheric pressure.If tube is turned to vertical position,what amount of mercury will be displaced?
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
An insulated container containing monoatomic gas of molar mass $m$ is moving with velocity $v_0$.If the container is suddenly stopped,find the change in temperature.
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
A box of $1m^3$ is filled with nitrogen at 1.5atm at 300K.The box has a hole of area $0.01mm^2$.How much time is required for pressure to reduce by 0.1atm.If pressure outside is 1atm
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
An air bubble is released from the bottom of a lake of depth 11m.The temperature at the bottom is $4^{\large\circ}C$ and that at the surface is $12^{\large\circ}C$.What is the ratio of bubble's radius at the surface and its radius at bottom?Assume density of heater is $100Kg/m^3$.Atmospheric pressure =$75$cm of Hg & density of mercury =$13600Kg/m^3$
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
A vessel A with a capacity $V_1=2lt$ contains gas at a pressure $P_1=2atm$ and a vessel B with a capacity of $V_2=4lt$ contains the same gas at a pressure of 1atm.The temperature is $0^{\large\circ}C$ in A & $27^{\large\circ}C$ in B.What will be the pressure in the vessels if they are connected by a tube?
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
The profile of a dam is an arc of a circle,the arc having a radius of 30m and subtending an angle of $60^{\large\circ}$ at the centre of curvature which lies in the water surfaces.Determine the load on the dam in N/m
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
A tank with vertical sides is square in plane with 3m long sides.The tank contains oil of relative density 0.9 to a depth of 2.0m which is floating on water a depth of 1.5m.Calculate the force on the walls.(Consider one wall of the tank).
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
A closed tank has an orifice $0.025m$ diameter in one of its vertical sides.The tank contains oil to a depth of 0.61m above the centre of the orifice and the pressure in the air space above oil is maintained at $13780N/m^2$ above atmospheric.What is the discharge from the orifile.(Coefficient of discharge of the orifice is 0.61 relative density of oil is 0.9)
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
The face of a dam is vertical to a depth of 17m below the water surface from slopes at $60^{\large\circ}$ to the vertical.If the depth of water is 7.5m.What is the $F_{resultant}$ on the whole face?
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 9, 2014
by
sreemathi.v
1
answer
Find the points on the $x$ axis, whose distance from the line $\large\frac{x}{3}$$+\large\frac{y}{4}$$=1$ are 4 units.
cbse
class11
ch10
straight-lines
bookproblem
exercise10-3
sec-b
q5
difficult
asked
May 9, 2014
by
thanvigandhi_1
1
answer
A metal piece of mass 160g lies in equlibrium inside a glass of $H_2O$.The piece touches the bottom of the glass at a small number of points.If the density of the metal is $8000Kg/m^3$.Find the normal force exerted by the bottom of the glass on the metal piece
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 9, 2014
by
sreemathi.v
1
answer
In a test experiment on a model aeroplane in a wind tunnel,the flow speeds on the upper and lower surfaces of the wing are $70ms^{-1}$ respectively.What is the lift on the wing if its area is $2.5m^2$?Take the density of air to be $1.3Kgm^{-3}$
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 9, 2014
by
sreemathi.v
1
answer
In Milikan's oil drop experiment,what is the terminal speed of an uncharged drop of radius $2\times 10^{-5}m$ and density $1.2\times 10^3Kgm^{-3}$?Take the viscocity of air at the temperature of the experiment is $1.8\times 10^{-5}pas$.How much is the viscous force on the drop at the speed?Neglect byoyancy of the drop due to air.
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 9, 2014
by
sreemathi.v
1
answer
What is the pressure inside the drop of mercury of radius 3mm at room temperature?S.T of mercury at that temperature $(20^{\large\circ}C)$ is $4.65\times 10^{-1}Nm^{-1}$.The $P_{atm}=1.01\times 10^4pa$.Also give excess pressure inside the drop
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 9, 2014
by
sreemathi.v
1
answer
U-shaped wire is dipped in a soap solution,and removed.The thin film formed between the wire and the light slider,supports a weight of $1.5\times 10^{-2}N$(which includes the small weight of the slider).The length of slider is 30cm.What is the surface tension of the film?
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 9, 2014
by
sreemathi.v
1
answer
A rod of mass M of radius r,length l made up of material of young modulus Y is rotating in horizontal plane with angular velocity $\omega$.
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 9, 2014
by
sreemathi.v
1
answer
A rod of radius 2mm,length 80cm density $5KKg/m^3$ and made up of material of $Y=1\times 10^{10}N/m^2$.Find the elongation due to its own weight.
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 9, 2014
by
sreemathi.v
1
answer
The length of a wire is 8cm when tension in it is 80N and is 15cm when tension in it 200N.The natural length of the wire is
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 9, 2014
by
sreemathi.v
1
answer
When the load is hang from a string then the ratio of work done by gravity to the work done spring force is
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 8, 2014
by
sreemathi.v
1
answer
The potential energy U between two molecules as a function of distance r between them has been shown.The two molecules are
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 8, 2014
by
sreemathi.v
1
answer
The rods A and B are heated.If $\alpha_1 : \alpha_2=5 : 7$,the thermal stresses develpoed on the two rods are equal if $Y_1 : Y_2$ is
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 8, 2014
by
sreemathi.v
1
answer
A golden ring of radius 0.5cm and cross section area $2mm^2$ is shifted to a wooden of disk of radius 8cm.If young modulus is $3\times 10^{10}N/m^2$,what is force along its length?
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 8, 2014
by
sreemathi.v
1
answer
A long spring is stretched by 3cm and its potential energy is U.If spring is stretched by 12cm,its potential energy will be
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 8, 2014
by
sreemathi.v
1
answer
2 wires of equal length are suspended.$Y_1=2\times 10^{11}N/m^2$ and $Y_2=3\times 10^{11}N/m^2$.Find equivalent young's modulus of combination,$Y$
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 8, 2014
by
sreemathi.v
1
answer
A steel wire 5mm in diameter is fixed between 2 clamps at $30^{\large\circ}C$.The temperature is increased to $30^{\large\circ}C$.Find the tension at $50^{\large\circ}C$ if linear expansion of steel is $11\times 10^{-6}/^{\large\circ}C$ and $Y_{steel}=2.1\times 10^{11}N/m^2$
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 8, 2014
by
sreemathi.v
1
answer
A rubber catapult has a cross sectional area $2mm^2$ and total unstretched length 15cm.It is stretched to 18cm and then released to project a missile of 3g.Taking young modulus $8\times 10^8N/m^2$ find velocity of projection?
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 8, 2014
by
sreemathi.v
1
answer
A lift is tied with four iron wires and its mass is 1500Kg.If maximum acceleration of lift is $2m/s^2$ and maximum safe stress is $2\times 10^8N/m^2$ find the minimum diameter of the wire $g=10m/s^2$
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 8, 2014
by
sreemathi.v
1
answer
Find the density of material under a pressure $3\times 10^8N/m^2$ .Given the density of material $800Kg/m^3$.Bulk modulus of material $9\times 10^9N/m^2$.
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 8, 2014
by
sreemathi.v
1
answer
A solid sphere of radius 2cm of bulk modulus $2\times 10^6N/m^2$ is surrounded by a liquid in cylindrical container.A massless piston of area $100cm^2$ floats on the surface of the liquid.When a mass 30Kg is placed on piston to compress the liquid what is fractional change in the radius of sphere
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 8, 2014
by
sreemathi.v
1
answer
When the weight on a string is changed from 4Kg to 10Kg,the elongation changes from 0.3mm to 0.7mm,how much work done during this extension of the string?($g=10m/s^2$)
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 8, 2014
by
sreemathi.v
1
answer
What is tension in the wire of radius r and length 2l in the given situation if young's modulus is $Y$.
jeemain
physics
class11
ch9
ch10
properties-of-solids-and-liquids
difficult
asked
May 8, 2014
by
sreemathi.v
1
answer
Page:
« prev
1
...
9
10
11
12
13
14
15
...
65
next »
Home
Ask
Tuition
Questions
Practice
Your payment for
is successful.
Continue
...