Physics Test - ...

A bullet of mass \(20 \mathrm{~g}\) has an initial speed of \(1 \mathrm{~ms}^{-1}\), just before it starts penetrating a mud wall of thickness \(20 \mathrm{~cm}\). If the wall offers a mean resistance of \(2.5 \times 10^{-2} \mathrm{~N}\), the speed of the bullet after emerging from the other side of the wall is close to:

Marked by: Shlv Prakash

\(1 \mathrm{~kg}\) of water at \(100^{\circ} \mathrm{C}\) is converted into steam at \(100^{\circ} \mathrm{C}\) by boiling at atmospheric pressure. The volume of water changes from \(1.00 \times 10^{-3} \mathrm{~m}^3\) as a liquid to \(1.671 \mathrm{~m}^3\) as steam. The change in internal energy of the system during the process will be (Given latent heat of vaporisation \(=2257 \mathrm{~kJ} / \mathrm{kg}\), Atmospheric pressure \(=1 \times 10^5 \mathrm{~Pa}\) )

A circular coil of radius \(10 \mathrm{~cm}, 500\) turns and resistance \(2 \Omega\) is placed with its plane perpendicular to the horizontal component of the earth's magnetic field. It is rotated about its vertical diameter through \(180^{\circ}\) in \(0.25 \mathrm{~s}\). Estimate the magnitudes of the emf and current induced in the coil. Horizontal component of the earth's magnetic field at the place is \(3.0 \times 10^{-5} \mathrm{~T}\):

An electron and a proton are allowed to fall through the separation between the plates of a parallel plate capacitor of voltage \(5 \mathrm{~V}\) and separation distance \(\mathrm{h}=1 \mathrm{~mm}\). Calculate the time of flight for both electron and proton:

What amount of heat must be supplied to \(2.0 \times 10^{-2} kg\) of Nitrogen (at room temperature) to raise its temperature by \(45^{\circ} C\) at constant pressure? (Molecular mass of \(\left.N_{2}=28 ; R=8.3 J m o l^{-1} K^{-1} .\right)\)

Choose the correct statement for processes A & B shown in figure.

A radiation of energy '\(E\)' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is: (c = velocity of light)

A longitudinal wave is represented by \(x=10 \sin 2 \pi\left(n t-\frac{x}{\lambda}\right) \mathrm{cm}\).

The maximum particle velocity will be four times the wave velocity if the determined value of wavelength is equal to: 

In the given circuit, the potential difference across PQ will be nearest to

Alternating current cannot be measured by DC ammeter because: