Putrescine present in almost all mammalian cells, where they are believed to be involved in cell differentiation and proliferation. This can be prepared by
Question 2
Consider the two columns below :
Column ‘A’
A) Hofmann rearrangement
B) Curtius rearrangement
C) Lossen rearrangement
Column ‘B’
1) Isocyanate
2) Br2 + NaOH
3)
Which of the following match is correct :
Question 3
Which is maximum basic in nature?
Question 4
Identify the product P in the following reaction.
Question 5
Question 6
The major product obtained in the photobromination of 2-methyl butane is
Question 7
The product of the reaction between ethyl benzene and N-bromosuccinamide is
Question 8
Which of the following statements is wrong?
Question 9
In the given reaction,
the product ‘A’ is
Question 10
In the reactions given below
R–Clproduct A
R–Clproduct B
the compounds A and B are
Question 11
The magnetic flux across a lop of resistance 10 Ω is given by ϕ= 5t2 – 4t + 1 weber. How much current is induced in the loop after 0.2 sec ?
Question 12
A closed Gaussian surface of a radius r, which is placed in a magnetic field then find the amount of magnetic flux flowing through the surface,
Question 13
A coil of area 5cm2 having 20 turns is placed in a uniform magnetic field of 103 gauss. The normal to the plane of coil makes an angle. 30 ° with the magnetic field. The flux through the coil is
Question 14
In the arrangement shown in given figure current from A to B is increasing in magnitude. Induced current in the loop will
Question 15
An electric current i1 can flow either direction through loop (1) and induced current i2 in loop (2). Positive i1 is when current is from ‘a’ to ‘b’ in loop (1) and positive i2 is when the current is from ‘c’ to ‘d’ in loop (2)
In an experiment, the graph of i2 against time ‘t’ is as shown below
Which one(s) of the following graphs could have caused i2 to behave as given above.
Question 16
The magnetic field shown in the figure increases at a constant rate of 30 mT/sec. If the circular loop has the radius of 5 cm and resistance 45 Ω. Find the current in the wire if the switch S is closed.
Question 17
An inductor of inductance 8 H and zero resistance is connected with battery and fuse as shown in the figure. Fuse has the zero resistance and will blow when the current through it reaches 4 A. The switch is closed at t = 0. The fuse will blow
Question 18
In two single turn circular loop of wire have radii 20 cm and 2 cm. The loops lies in the same plane and are concentric. Find the mutual inductance of the pair is
Question 19
A circular ring is fixed in a gravity free space and one point of the ring is earthed. Now a magnet is placed along axis of the ring at a distance from its centre such that the nearer pole is North Pole as shown in figure. A sharp impulse is applied on the magnet so that it starts to move toward the ring. Then,
Question 20
A closed circuit consists of a resistance R, induction L and a source of emf E are connected in series. If the induction of a coil is abruptly decreases to L/4(by removing its magnetic core), the new current immediately after this moment is (Comment: before decreasing the inductance the circuit is in steady state)
Question 21
What is the center of circle (x-1)2 + (y-2)2 = 8?
Question 22
The centre of the circle passing through origin and making intercepts 8 and –4 on x and y axes respectively is
Question 23
If the centre of a circle is at (6,8) and the radius is 10 find the equation
Question 24
If the centre of a circle is at (-4,3) and the radius is 5 find the equation
Question 25
The equation of the chord of whose mid point is (1,-2) is
Question 26
If the point (k+1,k) lies in the region bound the curve x=and y-axis then k belong to the interval
Question 27
Let circle C with the centre at (0,0) and radius of 3 units. The locus of the midpoint of the circle extend an angle 2π/3 at its centre.
Question 28
The point diametrically opposite to the point P(1,0) on the circle is
Question 29
If P and Q are the points of the intersection of the circles x2 +y2 -4=0 and x2 +y2 -3x=0 , then the circle passing through P,Q and (2,2) ,
Question 30
The length of the diameter of the circle which touches the x-axis at (1,0) and passes through the point (3,2)