Explore Questions on "Engineering Entrance & IITJEE - WBJEE"

An ambulance siren has frequency 250 Hz. The ambulance is headed towards an accident site with a speed of 90 km/h . Two police officers on separate motor cycles head for the same accident site: one follows the ambulance with a speed of 80 km/h and the other approaches the accident site from the other direction with a speed of 80 km/h. What frequency does ambulance siren has for each of the police officers? Take the speed of sound equal to 340 m/s.

Gelatin which is a peptide is added in ice creams. What can be its role?

The mass of a hydrogen atom is ............. kg.

The oxidation number of carbon in \(CH_2O\) is

One mole of \(N_2H_4\) loses ten moles of electrons to form a new compound Y. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in Y? (There is no change in the oxidation state of hydrogen).

If 0.50 mole of \(BaCl_2\) is mixed with 0.20 mol of \(Na_3PO_4\), the maximum number of moles of \(Ba_3(PO_4)_2\) that can be formed is

M is molecular weight of \(KMnO_4\). The equivalent weight of \(KMnO_4\)when it is converted into \(K_2MnO_4\) is 

A gaseous mixture contains oxygen and nitrogen in the ratio of 1: 4 by weight. Therefore the ratio of their number of molecules is

The largest number of molecules is in

The compound \(YBa_2Cu_3O_7\), which shows superconductivity, has copper in oxidation state..................., assume that the rare earth element yttrium is in its usual + 3 oxidation state.

The total number of electrons present in 18 ml of water is .......................

Which of the following schemes is being implemented in rural areas which provides an assured employment of 100 days to a willing youth in India ?
(A) Sampoorna Gramin Rozgar Yojana (SGRY)
(B) National Rural Employment Programme (NREP)
(C) Rural Landless Employment Guarantee Programme
(D) Jawahar Rozgar Yojana (JRY)
(E) None of these

Help me to calculate the value of the integral: \(\int \limits _0^1{e^{x^2}dx}\)