Class 12th

Out of following isomeric forms of uracil, which one is present in RNA?

On the occasion of Janmasthmi, four persons – A1, A2, A3 and A4 bought certain dozens of bananas for their respective houses. Their wives also went to the market and bought bananas. Further it is known that

I. The wives are W1, W2, W3 and W4

II. A1 bought as many bananas as his wife, A2 bought twice as many as his wife, A3 bought three times as many as his wife, and A4 bought four times as his wife.

III. W1 bought 2 dozens bananas, W2 bought 3, W3 and W4 bought 4 and 5 dozens of bananas respectively.

IV. The four couples bought 44 dozen of bananas between them.

Who is the wife of A4 among the four females?

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Synthesis of ethyl phenyl ether may be achieved by Williamson synthesis.

Reason (R): Reaction of bromobenzene with sodium ethoxide yields ethyl phenyl ether.

In the light of the above statements, choose the most appropriate answer from the options given below:

A capacitor of 50   $\mu F$  is connected in a circuit as shown in figure. The charge on the upper plate of the capacitor is__________   $\mu C.$

A plane electromagnetic wave with frequency of 30 MHz travels in free space. At particular point in space and time, electric field is 6 V/m. The magnetic field at this pint will be x * 10^-8T. The value of x is_______.

In the following sequence of reactions, the final product D is:

The major product of the following reaction is

Six cities of India – Jammu, Kolkata, Lucknow, Mumbai, Nagpur and Orcha are connected by one way and two way highways as indicated in the diagram given below. The arrow head indicates the direction in which the traffic is allowed to flow. No other route is available except those given in the diagram.

What is the least possible number of cities, a person has to pass through, while travelling from Mumbai city to Lucknow city?