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Recent questions tagged difficult
Questions
A solid blocks whose density is greater then the density of liquid is placed inside the liquid. It begins to float. Now a string attached to the solid holds the solid submerged. Now the tension in the string is $T_1$. If the system is accelerated upward with an acceleration a how will the tension in the string change.
jeemain
physics
class11
unit7
properties-of-solids-and-fluids
q44
difficult
asked
Oct 8, 2013
by
meena.p
1
answer
A object of mass $5.0\;g$ is projected into air using a rubber string of cross sectional area of $1;mm^2$. The length of the chord when it was unstretched is 10.0 cm. It is then stretched to 12 cm to project the object . The young's modulus of rubber is $5.0 \times 10^8 n/m^2$. The velocity of projectile is (assuming all the energy of string is transferred to projectile)
jeemain
physics
class11
unit7
properties-of-solids-and-fluids
q41
difficult
asked
Oct 7, 2013
by
meena.p
1
answer
In the arrangement shown in figure $\large\frac{m_A}{m_B}=\frac{2}{3}$ and ratio of density of block B and of the liquid is $2:1$ The system is released from resat. Then
jeemain
physics
class11
unit7
properties-of-solids-and-fluids
q36
difficult
asked
Oct 7, 2013
by
meena.p
1
answer
The number of integral terms in the expansion of $(5^{\large\frac{1}{2}}$$+7^{\large\frac{1}{8}}$$)^{1024}$ is ?
jeemain
math
class11
ch8
binomial-theorem
positive-integral-index
difficult
asked
Oct 5, 2013
by
rvidyagovindarajan_1
1
answer
A uniform rod of length $2.0 m$ specific $0.5$ and mass$2 \;kg$ is hinged at one end to bottom of tank of water (Specific gravity =1.0) filled upto a height of $1m$. as shown when $\theta \neq 0$. the force exerted by hinge on the rod is $(g=10 \;m/s^2)$
jeemain
physics
class11
unit7
properties-of-solids-and-fluids
q30
difficult
asked
Oct 4, 2013
by
meena.p
1
answer
If $t_n=\bigg(1+\large\frac{1}{n}\bigg)$$^n$ for $n\in N$, then $t_n$ lies in the interval?
jeemain
math
class11
ch8
binomial-theorem
properties-and-applications
difficult
asked
Oct 1, 2013
by
rvidyagovindarajan_1
1
answer
$^nC_0$ - $\large\frac{^nC_1}{2}$ + $\frac{^nC_2}{3}$ - ...... = ?
jeemain
math
class11
ch8
binomial-theorem
positive-integral-index
difficult
asked
Sep 26, 2013
by
rvidyagovindarajan_1
1
answer
$^nC_1$ + $2.^nC_2$ + $3.^nC_3$ + ..... + $n.^nC_n$ = ?
jeemain
math
class11
ch8
binomial-theorem
positive-integral-index
difficult
asked
Sep 24, 2013
by
rvidyagovindarajan_1
1
answer
The coefficient of $x^7$ in the expansion $(1-x-x^2+x^3)^6$ is ?
jeemain
math
class11
ch8
binomial-theorem
general-and-middle-terms
difficult
asked
Sep 17, 2013
by
rvidyagovindarajan_1
1
answer
$\int \large\frac{(2\sin 2x-\cos x)}{(6-\cos 2x -4\sin x) }$$dx$
math
cbse
xii
ch7
sec-b
difficult
additionalproblem
asked
Sep 12, 2013
by
anonymous
1
answer
Refer to the below image :
jeemain
chemistry
unit22
organic-chemistry
halogens
q10
difficult
asked
Sep 5, 2013
by
sreemathi.v
1
answer
Refer to the below equation :
jeemain
chemistry
unit22
organic-chemistry
halogens
q9
difficult
asked
Sep 5, 2013
by
sreemathi.v
1
answer
Choose the correct comparison of reactivity of molecules in E2 elimination reaction
jeemain
chemistry
unit22
organic-chemistry
halogens
q8
difficult
asked
Sep 5, 2013
by
sreemathi.v
1
answer
Look at the following reaction and select the correct statement
jeemain
chemistry
unit22
organic-chemistry
halogens
q7
difficult
asked
Sep 5, 2013
by
sreemathi.v
1
answer
Mark out the correct comparison of the rates of solvolysis reaction
jeemain
chemistry
unit22
organic-chemistry
halogens
q6
difficult
asked
Sep 4, 2013
by
sreemathi.v
1
answer
Refer to the below equation :
jeemain
chemistry
unit22
organic-chemistry
halogens
q5
difficult
asked
Sep 4, 2013
by
sreemathi.v
1
answer
Choose the correct answer
jeemain
chemistry
unit22
organic-chemistry
halogens
q4
difficult
asked
Sep 4, 2013
by
sreemathi.v
1
answer
Predict the product
jeemain
chemistry
unit22
organic-chemistry
halogens
q3
difficult
asked
Sep 4, 2013
by
sreemathi.v
1
answer
n-propyl bromide would give SN2 reaction under which of the following condition?
jeemain
chemistry
unit22
organic-chemistry
halogens
q2
difficult
asked
Sep 4, 2013
by
sreemathi.v
1
answer
In which of the following reaction product formation by Hoffman’s rule?
jeemain
chemistry
unit22
organic-chemistry
halogens
q1
difficult
asked
Sep 4, 2013
by
sreemathi.v
1
answer
If $n$ is odd, then in how many ways $3$ numbers that are in A.P. can be selected from the numbers $1,2,3,...............n$?
jeemain
math
class11
ch7
permutations-and-combinations
fundamental-principle-of-counting
difficult
asked
Sep 3, 2013
by
rvidyagovindarajan_1
1
answer
The position vector of a point $P$ is given by $\overrightarrow r=x\hat i+y\hat j+z\hat k$, where $x,y,z\in N$. Position vector of point A is given by $\overrightarrow a=\hat i+\hat j+\hat k$. How many points P are possible so that $\overrightarrow r.\overrightarrow a=5$ ?
jeemain
math
class11
ch7
permutations-and-combinations
fundamental-principle-of-counting
difficult
asked
Sep 3, 2013
by
rvidyagovindarajan_1
1
answer
The no. of ways in which 16 prizes can be distributed among 4 students so that each student get atleast 3 prizes is ?
jeemain
math
class11
ch7
permutations-and-combinations
combinations
difficult
asked
Aug 31, 2013
by
rvidyagovindarajan_1
1
answer
The density of case of a planet is $s_1$ and that of the outer shell is $s_2$.The radius of case and that of the planet are R and 2R respectively. Gravitational acceleration at the surface of the planet is same as at a depth R. Find $\large\frac{s_1}{s_2}$
jeemain
physics
class11
unit6
gravitation
q88
difficult
asked
Aug 29, 2013
by
meena.p
1
answer
A uniform rod of length $'l'$ whose mass per unit length is $\lambda$. The gravitational force on a particle of mass m located at a distance d from one end of the rod as shown is
jeemain
physics
class11
unit6
gravitation
q87
difficult
asked
Aug 29, 2013
by
meena.p
1
answer
Two lines intersect at O. Points $A_1,A_2,........A_n$ are taken on one of them and $B_1,B_2,........B_n$ on other. The no. of triangles that can be drawn from with the help of these 2n points and point 'O' is ?
jeemain
math
class11
ch7
permutations-and-combinations
combinations
difficult
asked
Aug 27, 2013
by
rvidyagovindarajan_1
1
answer
In an election no. of candidates exceeds the number to be elected by 2. If a man can vote in 56 ways, then the no. of candidates is
jeemain
math
class11
ch7
permutations-and-combinations
combinations
difficult
asked
Aug 27, 2013
by
rvidyagovindarajan_1
1
answer
If a planet orbiting the sun in a circular orbit suddenly stops, it will fall onto the sun in a time n(T) where T is the period of planets revolution , then n is
jeemain
physics
class11
unit6
gravitation
q85
difficult
asked
Aug 26, 2013
by
meena.p
1
answer
An artificial satellite of mass m moves in an orbit whose radius is n times the radius of earth. Assuming the resistance to the motion is proportional to square of velocity ie $F= av^2$ where a is a constant. How long will the satellite take to fall to earth. M-mass of earth R- radius of earth
jeemain
physics
class11
unit6
gravitation
q84
difficult
mock
asked
Aug 26, 2013
by
meena.p
1
answer
A body of mass m ascends from the earth's surface with zero initial velocity due to action of two forces as shown. The force $F$ varying with $h$ as $\hat F=-2m \vec {g} (1-ah)$ where a is constant. Find the maximum height atained by the body t
jeemain
physics
class11
unit6
gravitation
q83
difficult
asked
Aug 26, 2013
by
meena.p
1
answer
If a body is to be projected vertically upwards from the surface of the earth to reach a height nR then the velocity with which it is to be projected is
jeemain
physics
class11
unit6
gravitation
q82
difficult
asked
Aug 26, 2013
by
meena.p
1
answer
A uniform ring of mass $M$ and radius $R$ is placed directly above a uniform sphere of mass $8M$ and of radius $R$. The center of the ring is at a distance of $d= \sqrt 3 R$ from the center of the sphere. The gravitational attraction between the sphere and ring is
jeemain
physics
class11
unit6
gravitation
q77
difficult
asked
Aug 26, 2013
by
meena.p
1
answer
A satellite of mass $m_s$ revolving in a circular orbit of radius $r_s$ round the earth of mass M has a total energy E. Then its angular momentum will be
jeemain
physics
class11
unit6
gravitation
q49
difficult
asked
Aug 22, 2013
by
meena.p
1
answer
A geostationary satellite is at a height h above the surface of the earth If R is radius of earth 1) The mimimum coaltitude on earth upto which the satellite can be used for communication is $\sin ^{-1} \bigg(\large\frac{R}{R+a}\bigg)$ 2) The maximum coaltitude on earth upto which the satellite can be used for communication is $\sin ^{-1} \bigg(\large\frac{R}{R+h}\bigg)$ 3) Area of earth escaped from this satellite is given by $ (2 \pi R^2(1+\sin \theta)$ 4) Area of earth escaped from this satellite is given by $ (2 \pi R^2(1+\cos \theta)$
jeemain
physics
class11
unit6
gravitation
q43
difficult
asked
Aug 21, 2013
by
meena.p
1
answer
Four similar particles of mass M are orbiting in a circle of radius r in the same angular direction because of their mutual gravitational attraction, velocity of particle is
jeemain
physics
class11
unit6
gravitation
q42
difficult
asked
Aug 21, 2013
by
meena.p
1
answer
In a double star, two stars of masses $m_1$ and $m_2$ distant r apart revolve about their common center of mass under their mutual gravitational attraction. Find the ratio of their kinetic energies $K_1 :K_2$
jeemain
physics
class11
unit6
gravitation
q33
difficult
asked
Aug 20, 2013
by
meena.p
0
answers
In how many ways can 3 girls and 9 boys can be seated in two vans having 3 numbered seats in the front and 4 numbered seats at the back so that the 3 girls are to be seated together in the back row?
jeemain
math
class11
ch7
permutations-and-combinations
permutations
difficult
asked
Aug 20, 2013
by
rvidyagovindarajan_1
1
answer
The largest natural numer $n$ for which $(33)!$ is divisible by $2^n$ is ?
jeemain
math
class11
ch7
permutations-and-combinations
fundamental-principle-of-counting
difficult
asked
Aug 20, 2013
by
rvidyagovindarajan_1
1
answer
The ratio of kinetic energy required to raise a satellite upto a height 'h' to the kinetic energy of the satellite at that height (R-radius of earth)
jeemain
physics
class11
unit6
gravitation
q30
difficult
asked
Aug 20, 2013
by
meena.p
1
answer
A satellite revolving roung the earth with orbital speed $v_0$, If it stops suddenly, the speed with which it will strike the surface of the earth would be (-ve escape velocity of the particle on earth's surface)
jeemain
physics
class11
unit6
gravitation
q29
difficult
asked
Aug 20, 2013
by
meena.p
1
answer
Two bodies of masses $m_1$ and $m_2$ are initially at rest placed infinite distance apart. They are then allowed to move towards each other under their mutual gravitational attraction. Their relative velocity when they are 'r' distance apart is
jeemain
physics
class11
unit6
gravitation
q28
difficult
asked
Aug 20, 2013
by
meena.p
1
answer
How many number of times the digit '5' appear in listing the integers from 1 to 1000?
jeemain
math
class11
ch7
permutations-and-combinations
combinations
difficult
asked
Aug 15, 2013
by
rvidyagovindarajan_1
1
answer
The number of ways in which four letters of the word $MATHEMATICS$ can be arranged is ?
jeemain
math
class11
ch7
permutations-and-combinations
difficult
asked
Aug 15, 2013
by
rvidyagovindarajan_1
1
answer
How many 6 digit numbers can be formed using the digits $1,2,3$ so that the digit 1 occur 2 times in each number?
jeemain
math
class11
ch7
permutations-and-combinations
combinations
difficult
asked
Aug 15, 2013
by
rvidyagovindarajan_1
1
answer
The no. of points $(x,y,z)$ in space whose coordinates are negative integers and $x+y+z+12=0$ is
jeemain
math
class11
ch7
permutations-and-combinations
fundamental-principle-of-counting
difficult
asked
Aug 15, 2013
by
rvidyagovindarajan_1
1
answer
The number of signals that can be formed using 6 flags of different colours taking 1 or more flags at a time is ?
jeemain
math
class11
ch7
permutations-and-combinations
permutations
difficult
asked
Aug 14, 2013
by
rvidyagovindarajan_1
1
answer
How many three digit numbers that are divisible by 3 can be formed using the digits 0,1,2,3,4,5 without repeating the digits?
jeemain
math
class11
ch7
permutations-and-combinations
permutations
difficult
asked
Aug 14, 2013
by
rvidyagovindarajan_1
1
answer
At an election a voter may vote for any no. of candidates but not greater than the number to be elected. There are 10 candidates and 4 are to be elected. If every voter votes for atleast one candidate, then no. of ways in which a voter can vote is?
jeemain
math
class11
ch7
permutations-and-combinations
combinations
difficult
asked
Aug 13, 2013
by
rvidyagovindarajan_1
1
answer
1.1! + 2.2! + 3.3! + ......... + n.n! = ?
jeemain
math
class11
ch7
permutations-and-combinations
permutations
difficult
asked
Aug 13, 2013
by
rvidyagovindarajan_1
1
answer
Two curves $x^3-3xy^2+2=0$ and $3x^2-y^3-2=0$ intersect at an angle of
cbse
class12
ch6
q45
p140
objective
exemplar
sec-a
difficult
math
asked
Aug 12, 2013
by
sreemathi.v
1
answer
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