The time required for a 50 Hz alternating current to reach the peak value starting from zero

If the total energy is transferred by the electromagnetic waves on a surface be \(U\) in time \(t\), then the total momentum delivered to the surface is

A bulb of \( 100 \text{ W} \) glows for \( 6 \text{ hours} \) a day. The units of energy consumed in \( 7 \text{ days} \) would be :

The electric potential at any point in space is given by \( V = 4x^2 \text{ volt} \). The electric field at the point (1 m, 0, 2 m) in SI unit is

A resistor develops 800 J of thermal energy in 20 s on applying a potential difference of 20 V. Its resistance is

Choose the phenomenon from the following, which shows that light is a transverse wave.

Choose the correct statements:
(A) The angle of incidence corresponding to an angle of refraction \(90^{\circ}\) is called critical angle (i).
(B) Refractive index of denser medium \(\mu=\frac{1}{\sin \left(i_c\right)}\).
(C) For \(i>i_c\), Snell's law of refraction cannot be satisfied.
(D) The refractive index of air increases with decrease in density.
(E) Rainbow is the combined effect of dispersion, refraction and reflection of sunlight by droplets.
Choose the correct answer from the options given below :

The frequency band of FM broadcast is -

Assuming the same rate of change continues for the following data :

Year(X)	2019	2020	2021	2022	2023
Profit in Percentage (y)	38	40	65	72	69

The equation of the straight line trend using the least square method is :

Read the passage carefully and answer the Questions
\(KMnO _4\) is prepared by the fusion of \(MnO _2\) with an alkali metal hydroxide and an oxidizing agent like \(KNO _3\) to give a dark-green manganate ion which disproportionate to give permanganate as follows.
\(\begin{array}{l}2 MnO _2+4 KOH + O _2 \rightarrow 2 K_2 MnO _4+2 H _2 O \\ 3 K_2 MnO _4+4 H ^{+} \rightarrow 2 KMnO _4+ MnO _2+2 H _2 O \end{array}\)
On heating \(K _2 MnO _4\) decomposes at 513 K to give \(K _2 MnO _4\). Permanganate ion is tetrahedral and diamagnetic
Acidified \(KMnO _4\) acts a strong oxidizing agent which oxidizes oxalic acid, ferrous ions, nitrite ion and iodides.
HCl is not used to make the medium acidic in oxidation reaction of \(KMnO _4\) in acidic medium, because....

When light of suitable frequency is incident on a photosensitive material, photo electrons are ejected and photoelectric current flows. If the intensity of the incident light is increased, then

Lactational amenorrhea refers to:

\(\Lambda_m^o\) for \(NaCl , HCl\), and NaAc are \(126.4,425.9\) and \(91.0 S cm ^2 mol^{-1}\), respectively. \(\Lambda_m^o\) for HAc is