From 6 different novels and 3 different dictionaries, 4 novels and 1 dictionary are to be selected and arranged in a row on a shelf so that the dictionary is always in the middle. Then the number of such arrangements is

Anonymous User Maths Permutation & Combination 15 Apr, 2020 1 Answer 66 views







Two voltameters, one of copper and another of silver, are joined in parallel. When a total charge q flows through the voltmeters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are z1 and z2 respectively the charge which flows through the silver voltameter is

Anonymous User Physics Thermal and Chemical Effects of Current 15 Apr, 2020 1 Answer 69 views









The negative Zn pole of a Daniell cell, sending a constant current through a circuit, decreases in mass by 0.13 g in 30 minutes. If the electrochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive Cu pole in this time is

Anonymous User Physics Thermal and Chemical Effects of Current 14 Apr, 2020 1 Answer 59 views

The thermo e.m.f. of a thermo­couple is at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as 10-5 A, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is

Anonymous User Physics Thermal and Chemical Effects of Current 14 Apr, 2020 1 Answer 57 views














 

 

The figure shows the velocity and acceleration of a point like body at the initial moment of its motion. The acceleration vector of the body remains constant. The minimum radius of curvature of trajectory of the body is?The figure shows the velocity and acceleration of a point like body at the initial moment of its motion. The acceleration vector of the body remains constant. The minimum radius of curvature of trajectory of the body is?

 

Anonymous User Physics 12 Apr, 2020 1 Answer 68 views


Two friends have equal number of sons. There are 3 tickets for a cricket match which are to be distributed among the sons. The probability that two tickets go to the sons of one and one tickets goes to the sons of other is 6 . Then total number of boys is equal to (sum of son of each friend).

Anonymous User Maths Probability 12 Apr, 2020 1 Answer 73 views





A wire when connected to 220 V mains supply has power dissipation P1. Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is P2. Then what will be P2 : P?

Anonymous User Physics Thermal and Chemical Effects of Current 12 Apr, 2020 1 Answer 56 views