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Recent questions tagged medium
Questions
What is the relative contribution of $CO_2$ to green house effect
jeemain
chemistry
class11
environmental-chemistry
unit14
q32
medium
asked
Jan 20, 2014
by
sreemathi.v
1
answer
In the absence of green house effect what would be the mean temperature of earth?
jeemain
chemistry
class11
environmental-chemistry
unit14
q31
medium
asked
Jan 20, 2014
by
sreemathi.v
1
answer
Which is logically equivalent to "If today is Sunday, Matt cannot play hockey."?
jeemain
math
mathematical-reasoning
class11
ch14
medium
statements
q8
asked
Jan 18, 2014
by
thanvigandhi_1
1
answer
"If Tom buys a red skateboard, then Amanda buys green in-line skates." Which statement below is logically equivalent?
jeemain
math
mathematical-reasoning
class11
ch14
medium
statements
q6
asked
Jan 18, 2014
by
thanvigandhi_1
1
answer
Mary says "The number I am thinking is divisible by 2 or it is divisible by 3". This statement is false if the number Mary is thinking of is
jeemain
math
mathematical-reasoning
class11
ch14
medium
statements
q5
asked
Jan 18, 2014
by
thanvigandhi_1
1
answer
The statement "If x is divisible by 8, then it is divisible by 6" is false if x equals
jeemain
math
mathematical-reasoning
class11
ch14
medium
statements
q4
asked
Jan 18, 2014
by
thanvigandhi_1
1
answer
Which of the following options indicate the correct contrapositive and converse respectively of the Statement- “Something is cold implies that it has cold temperature.”
jeemain
math
mathematical-reasoning
class11
ch14
medium
statements
q3
asked
Jan 18, 2014
by
thanvigandhi_1
1
answer
Which of the following options indicate the correct contrapositive and converse respectively of the Statement: If x is a prime number, then x is odd.
jeemain
math
mathematical-reasoning
class11
ch14
medium
statements
q2
asked
Jan 18, 2014
by
thanvigandhi_1
1
answer
Which of the following statements do not convey the same meaning as the statement-A “If a natural number is odd, then its square is also odd.”
jeemain
math
mathematical-reasoning
class11
ch14
medium
statements
q1
asked
Jan 18, 2014
by
thanvigandhi_1
1
answer
The figure shows graph between incident angle and refracted angle for two cases. case 1: when light travels from material 1 to air and case 2: when light travels from material 2 to air. The refractive index of material 1 and material 2 are
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
total-internal-reflection
medium
asked
Jan 17, 2014
by
meena.p
1
answer
Ostwald's process is a chemical process for making nitric acid $\text{HNO}_3$ by which of the following methods:
jeemain
chemistry
class12
ch7
inorganic-chemistry
p-block-elements
group-15
nitrogen
medium
asked
Jan 17, 2014
by
sreemathi.v
1
answer
Find out the number of angular nodes in the orbital to which the last electron of Cr enter.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q140
medium
asked
Jan 17, 2014
by
sreemathi.v
1
answer
The figure shows total internal reflection taking place in three materials of refractive indices $n_1,n_2$ and $n_3$ where $\theta _{\large c_1},\theta _{\large c_2},\theta _{\large c_3}$ are critical angles in the respective mediums. Then
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
total-internal-reflection
medium
asked
Jan 17, 2014
by
meena.p
1
answer
A mirror of width 'l' m is kept on a wall. A person is approaching the mirror from the front. An observer is behind a screen has a view of the mirror as shown. How far from the mirror will be person be when the observer will be able to see him in the mirror.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-mirrors
medium
asked
Jan 17, 2014
by
meena.p
1
answer
Bottom of a water tank is silvered A point object (dust particle) is at P inside the liquid at a height of 2 m from the base. An observer seeing directly from above sees both the image and the object What is the apparent distance between the object and image $(\mu_0 =\large\frac{4}{3} ) $
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
medium
asked
Jan 17, 2014
by
meena.p
1
answer
Calculate the uncertainty in velocity of an electron if the uncertainty in its position is of the order of $1A^{\large\circ}$
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
bhor's-model
q130
medium
asked
Jan 17, 2014
by
sreemathi.v
1
answer
If uncertainties in the measurement of position and momentum of an electron are equal,calculate uncertainty in the measurement of velocity.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q128
medium
asked
Jan 17, 2014
by
sreemathi.v
1
answer
Two mirror one concave of radius of curvature $0.4\;m$ and another convex mirror of radius of curvature $0.2 \;m$ are kept facing each other which are $0.5\;m$ apart. An object is placed between two mirrors, $0.25\;m$ from concave mirror. Where is the image formed after two reflections.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-mirrors
medium
asked
Jan 17, 2014
by
meena.p
1
answer
Calculate the uncertainty in velocity of a cricket ball (mass=0.15Kg) if its uncertainty in position is of the order of $1A^{\large\circ}$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q122
medium
asked
Jan 17, 2014
by
sreemathi.v
1
answer
The mean and standard deviation of a binomial variate X are 4 and $ \sqrt 3$ respectively. The $P( X \geq 1 )$ is equal to
jeemain
math
cbse
class12
probability
medium
q25
asked
Jan 16, 2014
by
thanvigandhi_1
1
answer
An object is placed in front of a concave mirror of focal length f. A virtual image of magnification 2 is formed.How for must the object be moved from original position so that a real image of same size is formed.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-mirrors
medium
asked
Jan 16, 2014
by
meena.p
1
answer
A bag contains 3 black, 3 white and 2 red balls. One by one three balls are drawn without replacement. The probability that the third ball is red is equal to
jeemain
math
cbse
class12
probability
medium
q24
asked
Jan 16, 2014
by
thanvigandhi_1
1
answer
A person has two children. If one of them is boy, then the probability that other is also a boy is
jeemain
math
cbse
class12
probability
medium
q23
asked
Jan 16, 2014
by
thanvigandhi_1
1
answer
A right angled prism ABC is dipped in water . such that the surface AB is in air as shown. A ray of light is normally. What must be the possible value of $\theta$ so that the say gets totally reflected at AC to reach surface BC.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prism
medium
asked
Jan 16, 2014
by
meena.p
1
answer
A ray of light is incident on side of a right angled prism normally. It then falls on the hypotenuse of the prism and gets reflected back as shown. If $\theta=45^{\circ}$ then the refractive index of the material of prism is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-a-prism
medium
aims-12-physics
asked
Jan 16, 2014
by
meena.p
1
answer
A ray of light travelling in glass enters glass water interface at an angle $\theta$. It finally emerges into air parallel to the surface of water. $ \mu_w=\large\frac{4}{3}$. What is the refractive index of glass.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
medium
asked
Jan 16, 2014
by
meena.p
1
answer
With what velocity must an electron travel so that its momentum is equal to that of a photon of wavelength $\lambda=5200A^{\large\circ}$?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q118
medium
cbse
ch2
structure-of-atom
asked
Jan 16, 2014
by
sreemathi.v
1
answer
Calculate momentum of radiations of wavelength 0.33nm
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
quantum-mechanical-model
q117
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
A combination of lens is formed by keeping two identical equiconvex lens of focal length f kept in contact and the space between them filled with liquid of refractive index $\mu_2 =\large\frac{4}{3}$. Focal length of the combination is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Jan 16, 2014
by
meena.p
1
answer
Calculate the angular frequency of an electron occupying the second Bohr's orbit of $He^+$ ion.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q116
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
A ray of light is incident on glass sphere of refractive index $\large\frac{3}{2}$. The ray incident at two surfaces after travelling through the sphere emerges tangential to the surface of the sphere. What must be the incident angle.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surface-and-lenses
medium
asked
Jan 16, 2014
by
meena.p
1
answer
Calculate the wavelength emitted during the transition of electron in between two levels of $Li^{+2}$ ion whose sum is 4 and difference is 2.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q114
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
A small point object is inside a glass surface as shown. Refraction takes place at concave spherical boundry separating glass air medium. For the image to be real the object distance u is (R-Radius of curvature of the surface , $\mu of glass =\large\frac{3}{2}$ )
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surface-and-lenses
medium
asked
Jan 16, 2014
by
meena.p
1
answer
Calculate the uncertainty in velocity of a cricket ball (mass=0.15Kg) if its uncertainty position is of the order of $1A^{\large\circ}$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q111
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
An electron beam can undergo diffraction by crystals.Through what potential should a beam of electrons be accelerated so that its wavelength becomes equal to $1.54A^{\large\circ}$?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q109
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
If uncertainties in the measurement of position and momentum are equal,calculate uncertainty in the measurement of velocity.
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
quantum-mechanical-model
q105
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
One quantum is absorbed per molecule of gaseous iodine for converting into iodine atoms.If light absorbed has wavelength of $5000A^{\large\circ}$,calculate energy required in KJ/mol.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q104
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
Three isotopes of an element have mass numbers m,m+1 and m+2.If the mean mass number is ( m +0.5) then which of the following ratios may be accepted for m,(m+1) and (m+2) in that order
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
atomic-models-(rutherford-and-thomson)
q103
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
Calculate the uncertainty in velocity of an electron if uncertainty in its position is of the order of $1A^{\large\circ}$
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
quantum-mechanical-model
q102
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
An electron moves in an electric field with a kinetic energy of 2.5eV.What is the associated De-Broglie wavelength?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q101
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
The energy E for an electron in H atom is $\large\frac{21.7\times 10^{-12}}{h^2}$erg.Calculate the energy required to remove electron completely from $n=2$ orbit.Also calculate the longest wavelength of light that can be used to cause this transition.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q99
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
A pair of dice is thrown independently three times. The probability of getting a score of exactly 9 twice is
jeemain
math
cbse
class12
probability
medium
q22
asked
Jan 15, 2014
by
thanvigandhi_1
1
answer
A man is known to speak truth 3 out of 4 times. He throws a die and reports that it is 6. The probability that it is actually a 6 is
jeemain
math
cbse
class12
probability
medium
q21
asked
Jan 15, 2014
by
thanvigandhi_1
1
answer
A fair die is tossed repeatedly until a six is obtained. Let X denote the number of tosses required. The probability that $ x = 3$ equals
jeemain
math
cbse
class12
probability
medium
q20
asked
Jan 15, 2014
by
thanvigandhi_1
1
answer
Let $w$ be a complex cube root of unity with $ W \neq 1$. A fair die is thrown three times. If $r_1, r_2\:and \: r_3$ are the numbers obtained on the die, then the probability that $ W^{r_1}+W^{r_2}+W^{r_3}=0$ is
jeemain
math
cbse
class12
probability
medium
q20
asked
Jan 15, 2014
by
thanvigandhi_1
1
answer
Calculate $\lambda$ of the radiations when the electrons jumps from III to II orbit for H atom.The electronic energy in II and III Bohr's orbit of H atom are $-5.42\times 10^{-12}$ and $-2.41\times 10^{-12}$erg respectively.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q98
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
Calculate the momentum of electron moving with $\large\frac{1}{3}$rd velocity of light
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
quantum-mechanical-model
q97
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
Calculate the wavelength of moving electron having $4.55\times 10^{-25}$Joule of kinetic energy
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
bhor's-model
q96
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
Calculate the wavelength of radiations emitted producing a line in Lyman series,when an electron falls from fourth stationary state in hydrogen atom $(R_H=1.1\times 10^7m^{-1})$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q91
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
Calculate the frequency of the spectral line emitted when the electron in n=3 in H-atom de-excites to ground state.$(R_H=109737/cm)$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q90
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
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