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The intermolecular interaction that is dependent on the inverse cube of distance between the molecule is :

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If the lines $1x−2 =1y−3 =−kx−4 $ and $kx−1 =2y−4 =1x−5 $are coplanar, then k can have

Diameter of plano-convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is $2×10_{8}m/s,$ the focal length of the lens is :

The period of oscillation of a simple pendulum is $T=2πgL .$ Measured value of L is 20.0 cm known to 1 mm accuracy and time for 100 oscillations of the pendulum is found to be 90 s using wrist watch of 1 s resolution. The accuracy in the determination of g is :

Locus of the image of the point (2, 3) in the line $(2x−3y+4)+k(x−2y+3)=0,kϵR$, is a :

A pendulum made of a uniform wire of cross sectional are A has time period T. When an additional mass M is added to its bob, the time period changes to $T_{M}$. If the Young's modulus of the material of the wire is Y then $Y1 $ is equal to : (g = gravitational acceleration)

Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy ?

What is the minimum energy required to launch a satellite of mass m from the surface of a planet of mass M and radius R in a circular orbit at an altitude of 2R?

An organic compound A upon reacting with NH3 gives B. On heating B gives C. C in presence of KOH reacts with $Br_{2}to giveCH_{3}CH_{2}NH_{2}.$ A is