NEET 2017 Question Paper - Code A Mock Test

Two blocks $A$ and $B$ of masses $3m$ and $m$ respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring. The magnitudes of acceleration of $A$ and $B$ immediately after the string is cut, are respectively:

Two Polaroids $P_1$ and $P_2$ are placed with their axis perpendicular to each other. Unpolarised light $I_0$ is incident on $P_1$. A third polaroid $P_3$ is kept in between $P_1$ and $P_2$ such that its axis makes an angle $45^{\circ }$ with that of $P_1$. The intensity of transmitted light through $P_2$ is:

A long solenoid of diameter $0.1\text{m}$ has $2\times 10^4$ turns per meter. At the centre of the solenoid, a coil of $100$ turns and radius $0.01\text{m}$ is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to $0\text{A}$ from $4\text{A}$ in $0.05\text{s}$. If the resistance of the coil is $10{\pi }^2\Omega$, the total charge flowing through the coil during this time is:

Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of disc with angular velocities ${\omega }_1$ and ${\omega }_2$. They are brought into contact face to face coinciding the axis of rotation. The expression for loss of energy during this process is:

Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time $t_1$. On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time $t_2$. The time taken by her to walk up on the moving escalator will be: