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JEE
Ask a question
Mansi Behl
asked
• 8 minutes ago
The reaction of acidified, aqueous potassium iodide with aqueous hydrogen peroxide
is thought to involve the following steps
Which one of the following conclusions cannot be drawn from this information?
a)
The iodide ion is oxidised by the hydrogen peroxide
b)
The acid acts as a catalyst
c)
The rate determining step is
H
2
O
2
+ I − → H
2
O + OI −
d)
The rate equation for the reaction is
rate = k [ H
2
O
2
] [ I − ]
Correct answer is option 'B'. Can you explain this answer?
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Answer
to Question
Alok Shukla
asked
• 11 minutes ago
What is the solubility of solid copper hydroxide at a pH of 8?
Given: Cu(OH)
2
(s)
Cu(OH)
2
(aq) K
1
=10
-6
M
Cu(OH)
2
(aq)
Cu(OH)
+
+ OH
-
K
2
= 10
-7
M
Cu(OH)
+
Cu
+2
+ OH
-
K
3
= 10
-4
M
(Assumed no other equilibrium is established)
...
more
a)
1.11 ×10
-5
M
b)
1.11 × 10
-7
M
c)
10
-6
M
d)
1.01 × 10
-4
M
Correct answer is option 'A'. Can you explain this answer?
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Answer
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Devendra Chary Kasula
asked
• 13 minutes ago
The line joining the points (x,2x) and (3,5) makes an obtuse angle with yhe positive direction of the x-axis . Then find the values of x?
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Answer
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Priya Singh
asked
• 13 minutes ago
If a, b, c > 0 & x, y, z ∈ R then the determinant
a)
a
x
b
y
c
z
b)
a
–x
b
–y
c
–z
c)
a
2x
b
2y
c2
z
d)
Zero
Correct answer is option 'D'. Can you explain this answer?
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Answer
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Aniket Sonkusare
asked
• 13 minutes ago
Needed a Test for electrostatics?
Related:
Equation Of The Gas State Processes (Part - 1) - Heat, Irodov
?
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Answer
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Jayesh Bhere
asked
• 20 minutes ago
Find the value of 2(sin 1 sin 2 . sin 89)÷ 2 (cos 1 cos 2 . cos 44) +1 ans. is underroot 2. can you explain the ans?
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Answer
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Visha Jaiswal
asked
• 30 minutes ago
[" If the tangents at two points "(1,2)" and "(3,6)" on a parabola intersect at the point "(-1,1)," then the "],[" slope of the directrix of the parabola is "]?
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Answer
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Mansi Behl
asked
• 33 minutes ago
In a meter bridge experiment resistances are connected as shown in the figure. Initially resistance P=4 Ω and the neutral point N is at 60 cm from A. Now an unknown resistance R is connected in series to P and the new position of the neutral point is at 80 cm from A. The value of unknown resistance R is :
a)
33/5 Ω
b)
6 Ω
c)
7 Ω
d)
20/3Ω
Correct answer is option 'D'. Can you explain this answer?
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Answer
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Mansi Behl
asked
• 35 minutes ago
Which of the following is a set
a)
The collection of most difficult topics in Mathematics is a set.
b)
The collection of most talented writers of India is a set.
c)
The collection of good cricket players of India is a set.
d)
A collection of vowels in English alphabets is a set.
Correct answer is option 'D'. Can you explain this answer?
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Answer
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Mansi Behl
asked
• 46 minutes ago
A value of x satisfying the equation sin[cot
−1
(1+x)]=cos[tan
−1
x], is :
a)
-1/2
b)
-1
c)
0
d)
1/2
Correct answer is option 'C'. Can you explain this answer?
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Answer
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Mansi Behl
asked
• 51 minutes ago
The particles which can be added to the nucleus of an atom without changing its chemical properties are called
a)
Electrons
b)
Protons
c)
Neutrons
d)
None of these
Correct answer is option 'C'. Can you explain this answer?
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Answer
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Goravx
asked
• 58 minutes ago
Can you explain the answer of this question below:
[(-1+√-3)/2]
3n
+ [(-1-√-3)/2]
3n
=
A:
0
B:
1
C:
2
D:
3
The answer is c.
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Answer
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Mansi Behl
asked
• 1 hour ago
A calorimeter of mass 0.2 kg and specific heat 900 J/kg-K. Containing 0.5 kg of a liquid of specific heat 2400J/kg-K. Its temperature falls from 60ºC to 55ºC in one minute. The rate of cooling is
a)
5 J/s
b)
15 J/s
c)
100 J/s
d)
115 J/s
Correct answer is option 'D'. Can you explain this answer?
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Answer
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Dev Singh
asked
• 1 hour ago
Find the derivative of m = 13x
4
+ 5x
3
- 12y
3
+ 24x
2
+ y
2
- 2x - 156 with respect to x.
a)
dm/dy = 52x
3
+ 15x
2
+ 48x - 2
b)
dm/dy = 52x
3
+ 15x
2
- 36y
2
+ 48x + 2y - 2
c)
dm/dy = 52x
3
+ 15x
2
- 36y
2
+ 48x + 2y - 3
d)
dm/dy = -36x
3
+ 2y
Correct answer is option 'D'. Can you explain this answer?
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Answer
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Amutha Varshini
asked
• 1 hour ago
A purse contains 4 copper coins and 3 silver coins, the second purse contains 6 copper coins and 2 silver coins. A coin is taken out from any purse. The probability that it is a copper coin is
a)
4/7
b)
37/56
c)
3/7
d)
3/4
Correct answer is option 'B'. Can you explain this answer?
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Answer
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Radhika Rungta
asked
• 1 hour ago
A is a 5×5 matrix with all elements integers and the numbers in each row and column forming an airthmetic progression. It is given a22=74 a35=186 a43=103 a51=0 .Then a55=?
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Answer
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Nalini Reddy
asked
• 1 hour ago
The coefficient of mutual inductance, when magnetic flux changes by 2 X 10
-2
Wb and current changes by 0.01 A is
a)
2 H
b)
4 H
c)
3 H
d)
8 H
Correct answer is option 'A'. Can you explain this answer?
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Answer
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Sandesh Gavali
asked
• 1 hour ago
2loga to basex+ loga base ax + 3loga base a ² x=0 find x?
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Answer
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Sakshi Agrawal
asked
• 1 hour ago
If f(x) =
then f(x) =
a)
b)
c)
d)
x
Correct answer is option 'D'. Can you explain this answer?
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Answer
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Sreehitha 2062
asked
• 1 hour ago
[2(sinh2 sinh3 sinh5)(e^5)]/(e^5-1)?
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Answer
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Pratima Hatizar
asked
• 1 hour ago
When a.d.c. motor operates at 200 V, its initial current is 5 A, but when it runs at maximum speed, the current is only 3 A. What is its back emf ?
a)
120 V
b)
200 V
c)
80 V
d)
Zero
Correct answer is option 'C'. Can you explain this answer?
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Answer
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Mitali
asked
• 1 hour ago
The value of the limit
a)
9
b)
2
c)
0
d)
6
Correct answer is option 'B'. Can you explain this answer?
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Answer
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Mansi Behl
asked
• 1 hour ago
How many electrons must be removed from each of two 5.0-kg copper spheres to make the electric force of repulsion between them equal in magnitude to the gravitational attraction between them?
a)
2.7 x 10
9
b)
2.7 x 10
10
c)
2.7 x 10
11
d)
2.7 x 10
12
Correct answer is option 'A'. Can you explain this answer?
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Answer
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Monu Kumar
asked
• 1 hour ago
Solve 2x+3x-(10x*6x)+18x/3x?
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Rajeev Gupta
asked
• 1 hour ago
If one sphere has a mass of 2kg and an electric charge of 4uC while another sphere, 3 meters away, has a mass of 1 kg ans ab electric charge of 5uC, what is the acceleration of the more massive sphere?
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Answer
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Ragini Singh
asked
• 1 hour ago
Needed a Document for drawing?
Related:
NATA Drawing Question Bank 3
?
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Answer
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Khushi Yadav
asked
• 1 hour ago
what is brownain motion?
Related:
Amorphous and Crystalline Solids with Classifications
?
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Answer
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Mansi Behl
asked
• 1 hour ago
In the presence of a small amount of phosphorous, aliphatic carboxylic acids react with chlorine or bromine to yield a compound in which α - hydrogen has been replaced by halogen. This reaction is known as :
a)
Wolff - Kischner reaction
b)
Etard reaction
c)
Hell - Volhard - Zelinsky reaction
d)
Rosenmund reaction
Correct answer is option 'C'. Can you explain this answer?
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Answer
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Mansi Behl
asked
• 1 hour ago
Which of the following compounds on heating at about
gives acetic acid ?
a)
Succinic acid
b)
Malic acid
c)
Malonic acid
d)
Oxalic acid
Correct answer is option 'C'. Can you explain this answer?
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Answer
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Prathum Pandey
asked
• 2 hours ago
A convex mirror of focal length f and a convex lens of focal length of f/2 placed at a distance 2f apart. the final image is formed at the middle of the lens and mirror find the distance of object from lens. Answer : 5f/8 Ple
...
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ase explain?
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Vinay Pratap Singh
asked
• 2 hours ago
Consider a uniform spherical planet of mass M and radius R. two parallel tunnels are dug at perpendicular distance 3R/5 symmetrically from centre . A particle is to be thrown from the starting one tunnel such that it enters i
...
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nto another tunnel without making collision with tunnel wall and continuous its motion as shown in the figure tunnels are frictionless and particle just lifts inside the tunnel. Consider the planet to be at rest?
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Siya Arora
asked
• 2 hours ago
Heat of hydrogenation of CH3-CH=CH2 is -30 kcal/mol resonance energy of 1,3butadiene is 3kcal/mol .what will be heat of hydrogenation of 1,3 butadiene?
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Answer
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Harshit Agarwal
asked
• 2 hours ago
Which of the following is not aromatic ?
a)
Benzene
b)
Cyclooctatetraenyl anion
c)
Tropylium cation
d)
Cyclopentadienyl cation
Correct answer is option 'D'. Can you explain this answer?
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Answer
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Mansi Behl
asked
• 2 hours ago
Suppose the drift velocity v
d
in a material varied with the applied electric field E as
. Then V - I graph for a wire made of such a material is best given by :
a)
b)
c)
d)
Correct answer is option 'C'. Can you explain this answer?
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Answer
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Harsha Reddy
asked
• 2 hours ago
Graph of a/x +b/y=k?
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Answer
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Mansi Behl
asked
• 2 hours ago
Which of the following polymer is formed when caprolactum is heated with the traces of water?
a)
nylon-6
b)
nylon-6, 6
c)
nylon-6, 10
d)
nylon-6, 12
Correct answer is option 'A'. Can you explain this answer?
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Answer
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Avinash Kumar
asked
• 2 hours ago
5.06 g of pure cupric oxide (CuO), on complete reduction by heating in a current of hydrogen, gave 4.04 g of metallic copper. 1.3 g of pure metallic copper was completely dissolved in nitric acid and the resultant solution was carefully dried and ignited. 1.63 g CuO were produced in the process. Show that these results illustrate the law of constant proportions.
Related:
Laws of Chemical Combinations
?
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Dragon Ball Z
asked
• 2 hours ago
The hydrogen atom in its ground state are excited by means of monochromatic radiation of
wavelength 1023 Å. Find the number of lines which can be seen in the resulting spectrum…
Correct answer is '3'. Can you explain this answer?
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Answer
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Krishan Singh
asked
• 2 hours ago
Equation of pair of straight line drawn through (1,and perpendicular to the pair of lines 3x
2
- 7xy + 2y
2
= 0 is :
a)
2x
2
+ 7xy - 11x + 6 = 0
b)
2(x - 1)
2
+ 7(x - 1)(y - 1) - 3y
2
= 0
c)
2(x - 1)
2
+ 7(x - 1)(y - 1) - 3(y - 1)
2
= 0
d)
none of the above
Correct answer is option 'D'. Can you explain this answer?
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Answer
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Atharva Nivalkar
asked
• 2 hours ago
Heat of combustion of H2 is -58kcal?
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Answer
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Abhijeet Sarade
asked
• 2 hours ago
Needed a Video for jee mains?
Related:
JEE Revision Notes
?
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Answer
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Mansi Behl
asked
• 2 hours ago
Tangents are drawn from a point P(3,4) to the ellipse (x
2
/9) + (y
2
/16) = 1 touching the ellipse in the points Q and R. The angle between PQ and PR is
a)
45º
b)
60º
c)
90º
d)
30º
Correct answer is option 'C'. Can you explain this answer?
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Answer
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Vikas Saini
asked
• 2 hours ago
Which of the following is a preposition?
a)
I am an advocate
b)
Delhi is on the Jupiter
c)
A half open door is half closed
d)
none of these
Correct answer is option 'B'. Can you explain this answer?
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Answer
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Sanjukta Chatterjee
asked
• 2 hours ago
The system of equations
αx+y+z = α-1
x+αy+z = α-1
x+y+αz, = α-1 has no solution, if α is
a)
-2
b)
either -2 or 1
c)
not -2
d)
1
Correct answer is option 'A'. Can you explain this answer?
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Answer
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Mansi Behl
asked
• 2 hours ago
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A):
Reason(R):
a)
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
b)
Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
c)
Assertion is true but Reason is false.
d)
Assertion is false but Reason is true.
Correct answer is option 'D'. Can you explain this answer?
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Borra Manikanta
asked
• 3 hours ago
The pitch of a screw gauge is 1 mm, there are 100 divisions in circular scale and each main scale division is of 1 mm. When there is no gap between the jaws, 97th division coincides with the main scale zero and zero of main s
...
more
cale is not visible. While measuring the diameter of a ball, the circular scale is between 3 mm mark and 4 mm mark such that the 76th division of circular scale coincides with the reference line, the diameter of the ball (in mm) is?
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Mamu Dutta
asked
• 3 hours ago
Which capital city can be reached on the shinkansen or "bullet train"?
a)
Manila
b)
Seoul
c)
Tokyo
d)
Beijing
Correct answer is option 'C'. Can you explain this answer?
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Answer
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Ritwick Banerjee
asked
• 3 hours ago
If f(x) =
then f(x) is (where { * } represents the fractional part function)
a)
Continuous at x =
b)
f(x) exists, but f is not continuous at x =
c)
f(x) does not exist
d)
f(x) = 1
Correct answer is option 'C'. Can you explain this answer?
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Answer
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Alima Rais Rais
asked
• 3 hours ago
Find the dimension of a rectangular Box with open top so that the total surface area of box is a minimum given that the volume of a box is constant say v?
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Harsh Singhal
asked
• 3 hours ago
Let circle c1 & c2 on Argand plane be given by |z+1|=3 & |z-2|=7 respectively.if a variable circle |Z-zⁿ|=r be inside c2 such that it touches c1 externally & c2 internally then locus of zⁿ describes a conic E whose eccentrici
...
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ty equal to ?
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Answer
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Mansi Behl
asked
• 3 hours ago
Aqueous solution of which salt will not contain ions with the electronic configuration 1s
2
2s
2
2p
6
3s
2
3p
6
?
a)
NaF
b)
NaCl
c)
KBr
d)
CaI
2
Correct answer is option 'A'. Can you explain this answer?
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Answer
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Nikita Sona
asked
• 3 hours ago
Let ABC and ABC' be two non-congruent triangles with sides AB = 4, AC = AC' = 2 2 and angle B = 30º. The absolute value of the difference between the areas of these triangles is
[JEE 2009, 5]
a)
5
b)
4
c)
6
d)
3
Correct answer is option 'B'. Can you explain this answer?
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Answer
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Vaibhav Dhoran
asked
• 3 hours ago
Needed a Test for matrix and determinants?
Related:
JEE Main Mock Test Series 2020 & Previous Year Papers
?
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Sejal Chauhan
asked
• 3 hours ago
If( 1/a) + (1/a-2b)+ (1/c) +(1/c-2b)=0 and a,b,c are not in A.P. ,then - (i) a,b,c are in G.P. (ii) a,b/2,c are in A.P. (iii) a,b/2,c are in H.P. (iv) a,2b,c are in H.P.?
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Neeraj Chatterjee
asked
• 3 hours ago
If A, B are two square matrices such that AB = A and BA = B, then
a)
A, B are idempotent
b)
only A is idempotent
c)
only B is idempotent
d)
none of these
Correct answer is option 'A'. Can you explain this answer?
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Shubham Rajput
asked
• 3 hours ago
Toluic acid on reaction with Br₂ + Fe gives
a)
b)
c)
d)
Correct answer is option 'C'. Can you explain this answer?
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Vishakha Jambhale
asked
• 3 hours ago
The vernier of a circular scale is divided into 30 divisions which coincide with 29 main scale divisions.If each main scale division is (1/2) what is the least count of the instrument in minutes?
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Neha Qureshi
asked
• 3 hours ago
a)
-1
b)
-3
c)
2
d)
1
Correct answer is option 'C'. Can you explain this answer?
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Answer
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Mansi Behl
asked
• 3 hours ago
Which of these statements is not true?
a)
In aqueous solution, the T1
+
ion is much more stable than T1 (III)
b)
LiAlH
4
is a versatile reducing agent in organic synthesis.
c)
NO
+
is not isoelectronic with O
2
d)
B is always covalent in its compounds
Correct answer is option 'D'. Can you explain this answer?
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Vinod Kumar
asked
• 3 hours ago
If I = integration of (x dx / 1 + sin2x + cos2x ) from limit 0 to π/4 . I = π ln2/b . Then find b ?
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Mansi Behl
asked
• 3 hours ago
Diameter of a steel ball is measured using a Vernier callipers which has divisions of 0.1 cm on its main scale (MS) and 10 divisions of its vernier scale (VS) match 9 divisions on the main scale. Three such measurements for a ball are given as :
If the zero error is -0.03cm, then mean corrected diameter is :
a)
0.56 cm
b)
0.59 cm
c)
0.53 cm
d)
0.52 cm
Correct answer is option 'B'. Can you explain this answer?
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Ram Mohith
asked
• 3 hours ago
For r = 0, 1, ...., 10 let A
r
, B
r
, C
r
denote, respectively, the coefficient of x
r
in the expansions of (1 + x)
10
, (1 + x)
20
and (1 + x)
30
. Then
is equal to [JEE 2010]
a)
B
10
- C
10
b)
c)
0
d)
C
10
- B
10
Correct answer is option 'D'. Can you explain this answer?
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Jamil Inamdar
asked
• 3 hours ago
A load of 31.4kg is suspended from a wire of radius 0.001and density 9000 calculate the change in temperature of wire of 75% of workdone is converted to het will be the young modulus and specific heat capacity of material of
...
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the wire are 9.8 *ten to power ten and 490J/kg k ?
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Mansi Behl
asked
• 4 hours ago
Consider an infinite geometric series with first term a and common ratio r. If its sum is 4 and the second term is 3/4, then
a)
a = 7/4, r = 3/7
b)
a = 2, r = 3/8
c)
a = 3/2, r = 1/2
d)
a = 3, r = 1/4
Correct answer is option 'D'. Can you explain this answer?
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Rajesh Kumar
asked
• 4 hours ago
Two rigid adiabatic vessel A and B which initially contain two gases are connected by pipe line with valve of negligible volume.The vessel A contains 2 moles He gas( Cp,m= 2.5 R) at 300 K,vessel B contains 4 moles of O2 gas (
...
more
Cv,m= 2.5R) at 400 K .The volume of A and B vessel of A and B is 5 and 7 litre respectively.If the valve is opened and 5.8 kcal heat supplied through it vessels then calculate the final pressure (in atm) in vessels.?
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Mursleen Chauhan Chauhan
asked
• 4 hours ago
A body of mass m is taken from earth surface to the height h equal to radius of earth, the increase in potential energy will be [NCERT 1971; CPMT 1971, 97; IIT 1983; CBSE PMT 1991; Kurukshetra CEE 1996; CMEET Bihar 1995; MNR 1998; AIEEE 2004]
a)
mgR
b)
(1/2)mgR
c)
2 mgR
d)
(1/4)mgR
Correct answer is option 'B'. Can you explain this answer?
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Hemanth Hemanth
asked
• 4 hours ago
A particle moves with initial velocity V1, and retardation av, where v is the velocity at any time t, then a) The particle will cover a total distance V1/a. b) The particle will come to rest after time 1/a. c) The particle wi
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ll continue to move for a long time. d) The velocity of particle will come V1/e after time 1/a. Choose the correct answers. It's multi answer question. And also have the explanation.?
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Vikas Saini
asked
• 4 hours ago
There are n
1
photons of frequency γ
1
in a beam of light. In an equally energetic beam, there are n
2
photons of frequency γ
2
. Then the correct relation is [KCET 2003]
a)
n
1
/n
2
=1
b)
n
1
/n
2
=γ
1
/γ
2
c)
n
1
/n
2
=γ
2
/γ
1
d)
n
1
/n
2
=γ
1
2
/γ
2
2
Correct answer is option 'C'. Can you explain this answer?
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Hemraj Soni
asked
• 4 hours ago
The first five years plan in Indian government started in
a)
1947-1948
b)
1950-1951
c)
1951-1952
d)
1955-1956
Correct answer is option 'B'. Can you explain this answer?
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Mansi Behl
asked
• 4 hours ago
Let f(x) = x, g(x) = 1/x and h(x) = f(x)g(x). Then h(x) = 1 if
a)
x is a real number
b)
x is a rational number
c)
x is an irrational number
d)
x is a real number ≠ 0
Correct answer is option 'D'. Can you explain this answer?
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Mahir Mahida
asked
• 4 hours ago
How can we measure volume of amoeba?
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Mansi Behl
asked
• 4 hours ago
Three forces i+2j-3k, 2i+3j+4k and i-j+k are acting at a point (0,1,2). The modulus of moment of forces about the point (1,-2,0) is
a)
6√10
b)
4√17
c)
5√10
d)
3√17
Correct answer is option 'A'. Can you explain this answer?
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Nikitha Nikki
asked
• 4 hours ago
Nitrogen oxoacids disproportionate in only acidic solutions where as phosphorus oxoacids in both alkali and acidic solutions. Please let me know why?
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Ashu Bhardwaj
asked
• 4 hours ago
The locus of the equation xy + yz = 0 is
a)
a pair of perpendicular planes
b)
a pair of parallel planes
c)
a pair of straight lines
d)
none of these
Correct answer is option 'B'. Can you explain this answer?
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Jenita Prince
asked
• 4 hours ago
Stars appears to move from east to west because
a)
All stars move from east to west
b)
The earth rotates from west to east
c)
The earth rotates from east to west
d)
The background of the stars moves from west to east
Correct answer is option 'B'. Can you explain this answer?
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Tanmay Nassa
asked
• 4 hours ago
and
be two functions and let f
1
(x) = max {f(t), 0
<
t
<
x, 0
<
x
<
} and g
1
(x) = min {g(t), 0
<
t
<
x, 0
<
x
<
1}. Then the area bounded by f
1
(x)
<
0, g
1
(x)
<
0 and x-axis is
a)
b)
c)
d)
Correct answer is option 'B'. Can you explain this answer?
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Aman Kumar
asked
• 4 hours ago
Which of the following statement is correct for a superheated vapor? (?
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Sanika Shaikh Shaikh
asked
• 4 hours ago
Direction (Q. Nos. 1- 8) This section contains 8 multiple choice questions. Each question has four
choices (a), (b), (c) and (d), out of which ONE or MORE THANT ONE is correct.
Q.
Among the butane conformers, when viewed about C
2
-C
3
bond, which occur at energy minima on a graph of potential energy versus dihedral angle?
a)
Gauche only
b)
Gauche
c)
Anti
d)
Eclipsed
Correct answer is option 'B,C'. Can you explain this answer?
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Ankan Ghosh
asked
• 4 hours ago
Intregation 0 to 1 (x^2 +1)/x^4+ x^2 +1 dx . Find the value. Then prove it: 1-1/5 +1/7-1/11+ 1/13-.=π /2√3?
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Swastik Singh
asked
• 4 hours ago
The reaction of tin metal with acid can be written as Sn(s) 2H (aq) → Sn2 (aq) H2(g) assume [Sn2 ] = 0.010 M, p(H2) = 0.965 atm. At what pH will the cell potential be zero?
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Pradeep Ahen
asked
• 4 hours ago
The n rows each containing m cells in series are joined in parallel. Maximum current is taken from this combination across an external resistance of 3Ω resistance. If the total number of cells used are 24 and internal resistance of each cell is 0.5 Ω then
a)
m=8,n=3
b)
m=6,n=4
c)
m=12,n=2
d)
m=2,n=12
Correct answer is option 'C'. Can you explain this answer?
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Anand Kumar
asked
• 4 hours ago
Let A,B,C be the vertices of a triangle and B,C lies on the line 3 x - 5 y = 1. It is given that angle A= 45 degree the slope of tangent at ' B' to the circumcircle of triangle ∆ABC can be. Options: a) 1/4 b) -1/4 c) -4 d) No
...
more
ne of these.?
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Aditya Sharma
asked
• 4 hours ago
In a container there is 440 GM's CO2, 12.6gm HNO3, 5.4gm H2O, 360 gm C6H12O6. If all the oxygen is used to make ozone ,then calculate how many moles we can make of ozone.?
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Kailash Devi
asked
• 4 hours ago
The least coefficient of friction for an inclined plane inclined at angle α with horizontal in order that a solid cylinder will roll down it without slipping is
a)
2/3 tan α
b)
2/7 tan α
c)
1/3 tan α
d)
5/7 tan α
Correct answer is option 'C'. Can you explain this answer?
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Sahil Mohammad
asked
• 4 hours ago
How to write a chemical equation in ionic form? Ex: CrI3+ KOH +Cl2=K2CrO4 +KIO4+ KCl+ H2O?
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Sumana Basu
asked
• 4 hours ago
The sum of the products of the elements of any row of a determinant A with the same row is always equal to
a)
1
b)
zero
c)
|A|
d)
|A|/2
Correct answer is option 'C'. Can you explain this answer?
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Zaheen
asked
• 5 hours ago
What is the number of ordered pair (A,B) where A and B are subset of {1,2,3,4,5} such that neither A subset of B nor B subset of A?
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Harshil Surati
asked
• 5 hours ago
Tribromobenzenze can be prepared?
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Bala Jee Gupta
asked
• 5 hours ago
Needed a Document for physics?
Related:
JEE Revision Notes
?
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Rajendra Manapure
asked
• 5 hours ago
If f(x)=x² x € (set of integer) =k(x²-4)/2-x, x € integer then limx->3 f(x) exist when. A. k=1 B. k € R C. x € R-{1} D. none of this?
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pooja pooja
asked
• 5 hours ago
A light disc made of aluminium (a non magnetic material) is kept horizontally and is free to rotate about its axis as shown in the figure. A strong magnet is held vertically at a point above the disc away from its axis. On revolving the magnet about the axis of the disc, the disc will (figure is schematic and not drawn to scale).
a)
Rotate in the direction opposite to the direction of magnet’s motion
b)
Rotate in the same direction as the direction of magnet’s motion
c)
Not rotate and its temperature will remain unchanged
d)
Not rotate but its temperature will slowly rise
Correct answer is option 'B'. Can you explain this answer?
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Mahi Mahi
asked
• 5 hours ago
If g(x)=x^2 x-1 and (gof)(x)=4x^2 10x 5, then f(5/4) is?
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Harshith Reddy
asked
• 5 hours ago
The orientation of an atomic orbital is governed by
a)
Spin quantum number
b)
Magnetic quantum number
c)
Principal quantum number
d)
Azimuthal quantum number
Correct answer is option 'B'. Can you explain this answer?
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Sheikh Safiya
asked
• 5 hours ago
When HCl gas is passed through a saturated Solutions of NaCl , the solubility of Nacl:
a)
increases
b)
does not change
c)
decreases
d)
NaCl is decomposed
Correct answer is option 'C'. Can you explain this answer?
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Mansi Behl
asked
• 5 hours ago
In a set of reactions p - nitrotoluene yielded a product E
The product E would be :-
a)
b)
c)
d)
Correct answer is option 'B'. Can you explain this answer?
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Nalini Reddy
asked
• 5 hours ago
Primary and secondary alcohols on action of red hot copper give
a)
Aldehydes and ketones respectively
b)
Ketones and Aldehydes respectively
c)
Only aldehydes
d)
Only ketones
Correct answer is option 'A'. Can you explain this answer?
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Shrutika Karpe
asked
• 6 hours ago
A source of sound moves along a circle of radius 2 m with constant angular velocity 40 rad/s. Frequency of the source is 300 Hz. A detector is kept at some distance from the circle in the same plane of the circle (as shown in figure). Which of the following is not the possible value of frequency registered by the detector? (Speed of sound = 320 m/s)
a)
250 Hz
b)
360 Hz
c)
410 Hz
d)
220 Hz
Correct answer is option 'C,D'. Can you explain this answer?
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Mansi Behl
asked
• 6 hours ago
Two wires W
1
and W
2
have the same radius r and respective densities ρ
1
and ρ
2
such that ρ
2
=4ρ
1
. They are joined together at the point O, as shown in the figure. The combination is used as a sonometer wire and kept under tension T.The point O is midway between the two bridges. When a stationary wave is set up in the composite wire, the joint is found to be a node. The ratio of the number of antinodes formed in W
1
to W
2
is :
a)
1:1
b)
1:2
c)
1:3
d)
4:1
Correct answer is option 'A'. Can you explain this answer?
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Mansi Behl
asked
• 6 hours ago
The number in the form z = a + bι where a, b ∈ R and i = √−1 is called a
a)
rational number
b)
complex number
c)
integer
d)
prime number
Correct answer is option 'B'. Can you explain this answer?
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Gangaiah Alluri
asked
• 6 hours ago
how we get e power x formula
Related:
Approximations and Exponential series
?
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