In the diagram shown, the normal reaction force between \(2\,kg\) and \(1\,kg\) is (Consider the surface, to be smooth)\(.........N\) (Given \(g =10\,ms ^{-2}\))

Given below are two statements : one is labelled as Assertion \((A)\) and the other is labelled as Reason \((R)\), Assertion \((A)\) :When a fire cracker (rocket) explodes in mid air, its fragments fly in such a way that they continue moving in the same path, which the fire cracker would have followed, had it not exploded Reason \((R)\):Explosion of cracker (rocket) occurs due to internal forces only and no external force acts for this explosion. In the light of the above statements, choose the most appropriate answer from the options given below :

A logic circuit provides the output \(Y\) as per the following truth table :

\(A\)	\(B\)	\(Y\)
\(0\)	\(0\)	\(1\)
\(0\)	\(1\)	\(0\)
\(1\)	\(0\)	\(1\)
\(1\)	\(1\)	\(0\)

The expression for the output \(Y\) is :

The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is \(20\, cm,\) the length of the open organ pipe is  .... \(cm\)

An object is placed at a distance of \(40\,\, cm\) from a concave mirror of focal length \(15\,\, cm.\) If the object is displaced through a distance of \(20\,\, cm\) towards the mirror, the displacement of the image will be 

A ball is thrown vertically downward with a velocity of \(20\; m / s\) from the top of a tower. It hits the ground after some time with a velocity of \(80\, m / s\). The helght of the tower is \(......m\) : \(\left( g =10\, m / s ^{2}\right)\)

An electron moves straight inside a charged parallel plate capacitor of uniform charge density. The space between the plates is filled with uniform magnetic field of intensity \(B ,\) as shown in the figure, Neglecting effect of gravity, the time of straight line motion of the electron in the capacitor is 

Match List I with List II related to muscular/skeletal system :

List I	List II
A. Tetany	I. Inflammation of joints
B. Arthritis	II. Autoimmune disorder affecting neuromuscular junction
C. Myasthenia gravis	III. Wild contraction in muscle due to low \(Ca ^{++}\)in body fluid
D. Muscular dystrophy	IV. Progressive degeneration of skeletal muscle

Choose the correct answer from the options given below :

Which of the following statements is wrong for viroids?

The correct order of the basic strength of methyl substituted amines in aqueous solution is

The blue and white selectable markers have been developed which differentiate recombinant colonies from non-recombinant colonies on the basis of their ability to produce colour in the presence of a chromogenic substrate.

Given below are two statements about this method:
Statement I : The blue coloured colonies have DNA insert in the plasmid and they are identified as recombinant colonies.

Statement II : The colonies without blue colour have DNA insert in the plasmid and are identified as recombinant colonies.

In the light of the above statements, choose the most appropriate answer from the options given below:

The values of \(K_{sp}\) of \(CaCO_3\) and \(CaC_2O_4\) are \(4.7 \times 10^{-9}\) and \(1.3 \times 10^{-9}\) respectively at \(25\,^oC.\) If the mixture of these two is washed with water, what is the concentration of \(Ca^{2+}\) ions in water ..............\( \times 10^{-5}\, M\)?

Metagenesis refers to