The angle between the particle velocity and wave velocity in a transverse wave is [except when the particle passes through the mean position]

"Heat cannot be flow itself from a body at lower temperature to a body at higher temperature". This statement corresponds to

Masses of three wires of copper are in the ratio of \(1: 3: 5\) and their lengths are in the ratio of \(5: 3: 1\). The ratio of their electrical resistances is

How many times more intense is a \(60 \mathrm{~dB}\) sound than a \(30 \mathrm{~dB}\) sound?

The period of revolution of an electron revolving in nth orbit of H-atom is proportional to

Current \(I\) is flowing in conductor shaped as shown in the figure. The radius of the curved part is \(r\) and the length of straight portion is very large. The value of the magnetic field at the centre \(O\) will be

The cylindrical tube of a spray pump has a cross-section of \(8 \mathrm{~cm}^{2}\), one end of which has 40 fine holes each of area \(10^{-8} \mathrm{~m}^{2}\). If the liquid flows inside the tube with a speed of \(0.15 \mathrm{~m} \mathrm{~min}^{-1}\), the speed with which the liquid is ejected through the holes is

Match List-I with List-II
\begin{array}{|l|l|l|l|}\hline & \text{List-I (Types of redox reactions)} & & \text{List-II (Examples)} \\\hline \text{a}. & \text{Combination reaction} & \text{(i)} & \mathrm{Cl}_{2(\mathrm{~g})}+2 \mathrm{Br}_{(\mathrm{aq})}^{-} \rightarrow 2 \mathrm{Cl}_{(\mathrm{aq})}^{-}+\mathrm{Br}_{2(\mathrm{l})} \\\hline \text{b.} & \text{Decomposition reaction} & \text{(ii)} & 2 \mathrm{H}_2 \mathrm{O}_{2(\mathrm{aq})} \rightarrow 2 \mathrm{H}_2 \mathrm{O}_{(1)}+\mathrm{O}_{2(\mathrm{~g})} \\\hline \text{c.} & \text{Displacement reaction} & \text{(iii)} & \mathrm{CH}_{4(\mathrm{~g})}+2 \mathrm{O}_{2(\mathrm{~g})} \xrightarrow{\Delta} \mathrm{CO}_{2(\mathrm{~g})}+2 \mathrm{H}_2 \mathrm{O}_{(1)} \\\hline \text{d.} & \text{Disproportionation reaction} & \text{(iv)} & \mathrm{H}_2 \mathrm{O}_{(1)} \xrightarrow{\Delta} 2 \mathrm{H}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \\\hline\end{array}

Choose the correct answer from the options given below.

The basic principle of Cottnell's precipitator is

An organic compound \( A \) on reduction gives compound \( B \), which on reaction with trichloro
methane and caustic potash forms \( C \). The compound ' \( C \) ' on catalytic reduction gives \( N \)-methyl
benzenamine, the compound ' \( \mathrm{A} \) ' is,

A dipole moment \(p\) and moment of inertia \(I\) is placed in a uniform electric field \(\mathbf{E}\). If it is displaced slightly from its stable equilibrium position, the period of oscillation of dipole is

Temperature of \(25^{\circ} \mathrm{C}\) in Fahrenheit and Kelvin scale respectively are

Identify the enzyme that catalyses the step labelled as 'M' in the given schematic representation of replication of retrovirus.