AIIMS 2019

Assertion : \(\mathrm{NH}_3\) is liquidities more easily than \(\mathrm{CO}_2\).
Reason : Critical temperature of \(\mathrm{NH}_3\) is more than \(\mathrm{CO}_2\).

Assertion : In adiabatic process work is
independent of the path.
Reason : In adiabatic process work done is
equal to negative of change in internal
energy.

A gun applied a force $F$ on a bullet which is given by \(F=\left(100-0.5 \times 10^5 t\right) \mathrm{N}\). The bullet emerges out with speed \(400 \mathrm{~m} / \mathrm{s}\). Then find out the impulse exerted till force on the bullet beco...

Assertion : A glass ball is dropped on
concrete floor can easily get broken
compared if it is dropped on wooden floor.
Reason : On concrete floor glass ball will take
less time to come to rest.

\(\alpha\)-particle is revolving in a circular path with radius \(r\) with speed \(v\), then find the value of magnetic dipole moment.

Assertion : Paramagnetic substances get
poorly attracted in magnetic field.
Reason : Because magnetic dipoles are
aligned along external magnetic field weakly.

A proton is projected with velocity \(\mathbf{v}=2 \hat{\mathbf{i}}\) in a region where magnetic field \(\mathbf{B}=(\hat{\mathbf{i}}+3 \hat{\mathbf{j}}+4 \hat{\mathbf{k}}) \mu \mathrm{T}\) and electric field $$\mathbf{E}=10 \hat{\mathbf{i}...

In figure, two parallel infinitely long current carrying wires are shown. If resultant magnetic field at point \(A\) is zero. Then determine the value of current \(I\).

Two circular loops having same radius \((R=10 \mathrm{~cm})\) and same current \(\frac{7}{2} \mathrm{~A}\) are placed along same axis as shown. If distance between their centres is \(10 \mathrm{~cm}\), find net magnetic field at point \(P\)...

If two protons are moving with speed \(v=4.5 \times 10^5 \mathrm{~m} / \mathrm{s}\) parallel to each other then find the ratio of electrostatic and magnetic force between them

Assertion : Electron moving perpendicular
to B will perform circular motion.
Reason : Force by magnetic field is
perpendicular to velocity.

Assertion : A charge particle is released
from rest in magnetic field then it will move
in a circular path.
Reason : Work done by magnetic field is non
zero.

If a small orifice is made at a height of
0.25 m from the ground, the horizontal
range of water stream will be

Determine the pressure difference in tube of
non-uniform cross sectional area as shown
in figure.
\(\Delta P=?, d_1=5 \mathrm{~cm}, v_1=4 \mathrm{~m} / \mathrm{s}, d_2=2 \mathrm{~cm}, v_2=?\)

In an isothermal process 2 water drops of radius \(1 \mathrm{~mm}\) are combined to form a bigger drop. Find the energy change in this process if \(T=0.1 \mathrm{~N} / \mathrm{m}\).

Assertion : Water drops take spherical shape
when falling freely.
Reason : Water has minimum surface
tension among all liquids.

Assertion : Sometimes insects can walk on
water.
Reason : The gravitational force on insect is
balanced by force due surface tension.

A sphere pure rolls on a rough inclined
plane with initial velocity 2.8 m/s. Find the
maximum distance on the inclined plane.

The given transistor operates in saturation region then what should be the value of \(V_{B B}\) ?
$$\begin{aligned}
& \left(R_{\text {out }}=200 \Omega, R_{\text {in }}=100 \mathrm{~k} \Omega, V_{C C}=3 \mathrm{~V},\right. \\\\
& \left.V_{B...

If voltage across a zener diode is 6V, then
find out the value of maximum resistance in
this condition.

Assertion : Photodiode and solar cell work
on same mechanism.
Reason : Area is large for solar cell.

Calculate the mean percentage error in five
observations,
80.0, 80.5, 81.0, 81.5, 82

Distance of 5th dark fringe from centre is \(4 \mathrm{~mm}\). If \(D=2 \mathrm{~m}, \lambda=600 \mathrm{~nm}\), then distance between slits is

A light of wavelength \(500 \mathrm{~nm}\) is incident on a Young's double slit. The distance between slit and screen is \(D=1.8 \mathrm{~m}\) and distance between slits is \(d=0.4 \mathrm{~mm}\). If screen moves with a speed of $$4 \mathrm...

Assertion : Distance between position of
bright and dark fringe remain same in YDSE.
Reason : Fringe width, \(\beta=\frac{\lambda D}{d}\)

Assertion : Incoming light reflected by earth
is partially polarised.
Reason : Atmospheric particle polarise the
light.

A string wave equation is given \(y=0.002 \sin (300 t-15 x)\) and mass density is \((\mu=0.1 \mathrm{~kg} / \mathrm{m})\). Then find the tension force in the string.

Two sources of sound S\(_1\) and S\(_2\) are moving
towards and away from a stationary observer
with the same speed respectively. Observer
detects 3 beats per second. Find speed of
sources (approximately).
Given, \(f_1=f_2=500\) Hz, speed o...

If the speed of sound in air is 330 m/s then,
find the number of tones present in an open
organ pipe of length 1 m whose frequency is \(\le\) 1000 Hz.

Initially spring in its natural
length now a block at mass 0.25 kg
is released then find out maximum
force by system on the floor.