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Calcium oxide can be used for drying of
jeemain
chemistry
class11
s-block-elements
unit10
q100
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The thermal stability of $BaCO_3,CaCO_3$ and $MgCO_3$ is
jeemain
chemistry
class11
s-block-elements
unit10
q99
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
What is the total charge on 75.0 kg of electrons ?
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-charge
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
How many NAND gates are used to form an AND gate
jeemain
physics
class12
unit19
ch14
q63
medium
logic-gates
semiconductor-electronics
asked
Jan 29, 2014
by
meena.p
1
answer
Metals used in flash photography is
jeemain
chemistry
class11
s-block-elements
unit10
q98
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Gypsum is not chemically similar to
jeemain
chemistry
class11
s-block-elements
unit10
q97
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
How many electrons must be removed from a piece of metal to give it a positive charge of $\;1\times10^{-7} \;C\;?$
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-charge
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
Alkaline earth metal(s) which does(do) not impact colour to the flame is(are)
jeemain
chemistry
class11
s-block-elements
unit10
q96
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Halides (Cl,Br and I) of alkaline earth metal which cannot be dehydrated by heating is (are)
jeemain
chemistry
class11
s-block-elements
unit10
q95
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Oxalates of alkaline earth metal(s) sparingly soluble in water (is) are
jeemain
chemistry
class11
s-block-elements
unit10
q94
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Alkaline earth metal sulphates which crystallises in hydrated form are
jeemain
chemistry
class11
s-block-elements
unit10
q93
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Slaked lime is obtained when water is added to
jeemain
chemistry
class11
s-block-elements
unit10
q92
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The compound insoluble in acetic acid is :
jeemain
chemistry
class11
s-block-elements
unit10
q91
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The pair of amphoteric hydroxides is :
jeemain
chemistry
class11
s-block-elements
unit10
q90
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Flame test is not given by
jeemain
chemistry
practical-chemistry
easy
asked
Jan 28, 2014
by
mosymeow_1
1
answer
$[X] + H_2SO_4 \longrightarrow [Y]$ colourless with irritating smell. $[Y] + K_2Cr_2O_7 + H_2SO_4 \longrightarrow$ Green solution. [X] and [Y] are
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
The ion that cannot be precipitated by both $HCl$ and $H_2S$
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
Truth table given below represents
jeemain
physics
class12
unit19
ch14
q62
medium
logic-gates
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
Potassium cyanide is used for separating
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
The following logic symbol represents
jeemain
physics
class12
ch14
q61
easy
logic-gates
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
How do we differentiate between $Fe^{3+}$ and $Cr^{3+}$ in groupIII?
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
For a given transistor, the value of the forward transfer ratio $\beta =50$. Calculatethe ratio of change in collector current to the change in emitter current.
jeemain
physics
class12
unit19
ch14
q60
easy
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
WHich of the following best describes the output of a full wave rectifier:
jeemain
physics
class12
unit19
ch14
q59
medium
semiconductor-electronics
diodes
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
The emitter current in a transistor is $ 1mA$ If $\alpha =0.95$ value of base current is :
jeemain
physics
class12
unit19
ch14
q58
medium
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
When a substance 'A' reacts with water, it produces a combustible gas 'B' and a solution of substance 'C' in water. When another substance 'D' reacts with this solution of 'C', it also produces the same gas 'B' on warming but 'D' can produce gas 'B' on reaction with dilute sulphuric acid at room temperature. 'A' imparts a deep golden yelow colour to the smokeless flame of bunsen flame. 'A', 'B' , 'C' & 'D' are respectively
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
Three separate samples of a solution of a single salt gave these results. One formed a white ppt. with excess ammonia solution, one formed a white ppt. with dil. NaCl solution and one formed a black ppt. with $H_2S$. The salt could be:
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
The only cations present in a slightly acidic solution are $Fe^{3+}, Zn^{2+}$ and $Cu^{2+}$. The reagent that when added in excess to this solution would identify and separate $Fe^{3+}$ in one step is
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
When $K_2Cr_2O_7$ crystals are heated with conc. HCl, the gas evolved is
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
A pale green crystalline metal salt $M$ dissolves freely in water. It gives a brown precipitate on addition of aqueous $NaOH$. The metal salt solution also gives a black precipitate on bubbling $H_2S$ in aqueous medium. An aqueous solution of the metal salt decolourises the pink colour of the permanganate solution. The metal in the metal salt solution is
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
For two data sets each of size 5, the variances are given to be 4 and 5 and the corresponding means are given to be 2 and 4 respectively. The variance of the combined data set is
jeemain
math
cbse
class11
statistics
variance-and-standard-deviation
difficult
q31
asked
Jan 28, 2014
by
thanvigandhi_1
1
answer
The transconductance of a transistor used as an amplifier in common emitter mode is $0.1 \;mho.$ When a signal of 10 mv is added to base emitter voltage change in collector current is
jeemain
physics
class12
unit19
ch14
q57
easy
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
The standard deviation of -1, -2, -3, -4, -5, -6, -7 is
jeemain
math
cbse
class11
statistics
easy
variance-and-standard-deviation
q79
asked
Jan 28, 2014
by
thanvigandhi_1
1
answer
Given $\Delta V_{BE} = $ potential difference across base emitter, $\Delta I_C = $ change in collector current, $\Delta I_B = $ change in the base current and $\Delta R_{BE} = $ change in base emitter resistance, which of the following best represents transconductance $g_m$.
jeemain
physics
class12
unit19
ch14
q56
easy
transistors
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
The two lines of regression are $ x+2y-5=0$ and $ x+3y-8=0$. The coefficient of correlation between $x$ and $y$ is
jeemain
math
cbse
class11
statistics
medium
variance-and-standard-deviation
q43
asked
Jan 28, 2014
by
thanvigandhi_1
1
answer
In a p-n function diode a input signal is applied as shown. The output across $R_L$ is
jeemain
physics
class12
unit19
ch14
q54
medium
junction-diodes
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
Yellow phosphorous on reaction with $Ca(OH)_2$ gives
jeemain
chemistry
class11
s-block-elements
unit10
q89
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
If $r_1$ and $r_2$ are regression coefficients of $y$ on $x$ and $x$ on $y$ respectively
jeemain
math
cbse
statistics
class11
difficult
variance-and-standard-deviation
q30
asked
Jan 28, 2014
by
thanvigandhi_1
1
answer
Which of the following quantities cannot be zero on an average for the molecules of an ideal gas in equilibrium condition?
jeemain
physics
kinetic-theory-of-gases
ch13
class11
easy
molecular-nature-of-matter
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
Which of the following is the strongest reducing agent?
jeemain
chemistry
class11
s-block-elements
unit10
q88
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Which of the following relations hold true for a monatomic gas?
jeemain
physics
kinetic-theory-of-gases
easy
class11
ch13
specific-heat-capacity
molar-specific-heat
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
In a transistor the level of doping for the three region is different . In the order of decreasing doping level,
jeemain
physics
class12
unit19
ch14
q53
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
The specific heat of a gas:
jeemain
physics
kinetic-theory-of-gases
easy
class11
ch13
specific-heat-capacity
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
The most active metal is
jeemain
chemistry
class11
s-block-elements
unit10
q87
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Under the conditions when no bias is applied across a p-n junction
jeemain
physics
class12
unit19
ch14
q52
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
The coefficient of correlation between $x$ and $y$ is $0.5$ and their covariance is $16$ and SD of $x$ is $4$ then SD of $y$ is
jeemain
math
cbse
class11
statistics
medium
variance-and-standard-deviation
q42
asked
Jan 28, 2014
by
thanvigandhi_1
1
answer
Portland cement does not contain :
jeemain
chemistry
class11
s-block-elements
unit10
q86
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Which of the following is used to produce ratio waves of constant amplitude
jeemain
physics
class12
unit19
ch14
q51
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
Keeping the volume constant and increasing the temperature, which of the following will hold true?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-theory-of-an-ideal-gas
kinetic-interpretation-of-temperature
easy
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
When p end of P-n junction is connected to positive terminal of the battery and N end to negative terminal , the p-n junction behaves like
jeemain
physics
class12
unit19
ch14
q50
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
Non metals present in borax are
jeemain
chemistry
class11
s-block-elements
unit10
q85
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
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