Choose the correct alternative: The resistivity of a typical insulator (e.g., amber) is greater than that of a metal by a factor of the order of `(10^22//10^23)`.

Choose the correct alternative: The resistivity of a typical insulator (e.g., amber) is greater than that of a metal by a factor of the order of (10^22//10^3) .

Choose the correct alternative: Alloys of metals usually have (greater//less) resistivity than that of their constituent metals.

Choose the correct alternative: Alloys usually have much (lower//higher) temperature coefficients of resistance than pure metals.

Choose the correct alternative from the clues given at the end of the each statement: The size of the atom in Thomson model is..... the atomic size in Rutherford model( much greater than /no different from/ much less than.)

The gravitational attraction between electron and proton in a hydrogen atom is weaker than the coulomb attraction by a factor of about 10^ -40 . An alternative way of looking at this fact is to estimate the radius of the first Bohr orbit of a hydrogen atom if the electron and proton were bound by gravitational attraction. You will find the answer interesting.

Choose the correct matching of transition metal ion and magnetic moment from the codes given below: (At. No: Ti= 22, V=23 , Fe=26)

Statement-1 (Assertion) and Statement-2 (Reason) Each of the these examples also has four alternative choices , only one of which is the correct answer. You have to select the correct choice as given below . Number of distinct terms in the sum of expansion (1 + ax)^(10)+ (1-ax)^(10) is 22.

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : The e.m.f. of a cell is always greater than the terminal potential difference between its two pole. Reason: There is always some potential drop across the internal resistance of the cell.

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : Electric appliances with metallic body e.g., heater,s presses etc, have three pin connections, whereas an electric bulb has two pin connection. Reason : Three pin connections reduce heating of connecting cables.

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : To compare the e.m.fs of two cells using a potentiometer, the e.m.f. of the cell in auxillary circuit must be greater than the e.m.fs of both the cells. Reason : The area of cross-section of the wire should be uniform and current through the wire should always be kept constant.