List of top Questions asked in Punjab PMET

The shortest wavelength of the Brackett series of hydrogen like atom (atomic number $ =Z$) is the same as the shortest wavelength of the Balmer series of hydrogen atom. The value of $Z$ is

A radioactive element $ x $ converts into another stable element $ y $ . Half-life of $ x $ is $ 2h $ , initially only $ x $ is present. After time $ t $ , the ratio of atoms of $ x $ and $ y $ is found to be $ 1:4 $ , then $ c $ in hour is

Two planets $ A $ and $ B $ have the same material density. If the radius of $ A $ is twice that of $ B $ , then the ratio of escape velocity $ \frac{v_{A}}{v_{B}}$ is

A man goes at the top of a smooth inclined plane. He releases a bag to fall freely and himself slides down on inclined plane to reach the bottom. If $u_{1}$ and $u_{2}$ are the velocities of the man and bag respectively, then

Two sources are at a finite distance apart. They emit sound of wavelength $ \lambda $ . An observer situated between them on line joining the sources, approaches towards one source with speed $u$ , then the number of beats heard per second by observer will be

A car moves on a circular road. It describes equal angles about the centre in equal intervals of time. Which of the following statements about the velocity of the car is true?

A closely wound flat circular coil of $25$ turns of wire has diaineter of $10\, cm$ which carries current of $4\, A$, the flux density at the centre of a coil will be

In the figure, pendulum bob on left side is pulled aside to a height h from its initial position. After it is released it collides with the right pendulum bob at rest, which is of same mass. After the collision the two bobs stick together and raise to a height

When oxyhaemoglobin changes to de-oxyhaenioglobin, $Fe^{2+}$ ion changes from

When $AgNO _{3}$ solution is added in excess to $1\, M$ solution of $CoCl _{3} \cdot x NH _{3}$, one mole of $AgCl$ is formed. What is the value of $x$ ?

A body is thrown vertically up with certain initial velocity. The potential and kinetic energies of the body are equal at a point P in its path. If the same body is thrown with double the velocity upwards, the ratio of potential and kinetic energies of the body when it crosses the same point, is

The bond angle in $AsH _{3}$ is greater than that in

$N _{2}(g)+3 H _{2}(g) \rightleftharpoons 2 NH _{3}(g)+22\, kcal$. The activation energy for the forward reaction is $50\, kcal$. What is the activation energy for the backward reaction?

Three charges $ 1\mu C, $ $ 1\mu C $ and $ 2\mu C $ are kept at vertices of $A, B$ and $C$ of an equilateral triangle $ABC$ of $ 10\,cm $ side respectively. The resultant force on the charge at $C$ is

The temperature of the system decreases in the process of

The functional groups present in salol are

In Ramsden eyepiece, the two planoconvex lenses each of focal length $ f $ are separated by a distance $ 12\,cm $ . The equivalent focal length (in $ cm $ ) of the eyepiece is

Which one of the following reactions is called Rosemond reaction?

The raw material used in nylon-$6$ is

The atomic number of an element $ M $ is $26R$ . How many electrons are present in the M-shell of the element in its $M^{3+}$ state?

Which of the following is the decreasing order of boiling points of $ V $ group hydrides?

What is the wave number of $4^{th}$ line in Balmer series of hydrogen spectrum? $(R=1,09,677\,cm^{-1})$

A mixture of amylose and amylopectin is called

Disperse phase and dispersion medium in butter are respectively

A liquid does not wet the solid surface if the angle of contact is