## Physics midterm preparatory exam, ISC-II, C.I.S.C.E.

PREPARATORY CLASS EXAMINATION FOR MIDTERM – 2013
(16 Aug 2013)

PHYSICS
PAPER I
(THEORY)
(Three hours)

They must not start writing during this time

Answer all questions in Part I and eight questions in Part II, choosing two questions from each of the three sections A, B and C.

All working including rough work should be done on the same sheet as, and adjacent to, the rest of the answer.

The intended marks for questions or parts of questions are given in brackets [  ].

PART I
Question 1 [ Objective ]
Total 10 marks
Each sub-question carries 1 mark.  Answer all.

(a)
Which of the following is a vector?

A. An electric dipole’s electric potential
B. An electric dipole’s charge
C. Electric current                   D. Electric current density

(c)
Pick only the correct one “between an electron and a positron”

A. The electron has more specific charge

B. The positron has more specific charge

C. Both have equal specific charge

D. For some particles specific charge can’t be determined, so it can’t be said electron or positron has more specific charge

(d)
Chose the correct one

A. Kirchhoff’s loop rule is applied to a junction of incoming and outgoing current

B. According to Kirchhoff’s loop rule a junction of incoming and outgoing current carries a potential proportional to the amount of current flowing through the junction

C. Kirchhoff’s Junction rule can be applied to a single current carrying path in any electric circuit

D. The potential drop in a loop in any electric circuit is zero and its based on conservation of energy

(e)
Chose the correct one

A. Resultant of capacitance in series in more than individual resistances

B. Current division works on the basis of direct proportionality of resistances

C. Voltage division works on the basis of direct proportionality of resistances

D. Resistors in series will add up

PART II
Total 50 marks (Optional, 6 out of 9. Compulsory 2)

SECTION A
This question is compulsory  ( total 7 )

Question 2
Define electric current and electric current density. State if these two quantities are scalar or vector quantities and explain why. State and explain Ohm’s law. Derive the Ohm’s law in vector form from the scalar form. Write the expression for drift velocity.

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## Physics class tests for junior college, –III

Physics class tests for PUC, ISc, XII in the CBSE, ICSE (CISCE), State boards.
Subject: Physics
Test: Class test — III
Class: PUC — II (also good for ISC — II)
date: 5th August 2013.
Time: 55 minutes
Total marks: 35

Section A
Objective — 7 questions each carry 1 mark, all questions to be answered.

Question 1
Targets in X-ray tube are made of high atomic number metals. Examples are

A. Tungsten and Platinum              B. Nickel and Chromium

C. Uranium and Plutonium            D. Sodium and Mercury

Question 2
Electric and magnetic fields do not deflect which of the following

A. X-rays                    B. Y-rays

C. Electrons              D. Cosmic Rays

Question 3

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## Physics class tests for junior college, –I, II

Physics class tests for PUC, ISc, XII in the CBSE, ICSE (CISCE), State boards.

Class test — I

Subject: Physics
Test: Class test — I
Class: ISC — II, PUC — II

Question 1
Whats the unit of capacitance?

Question 2
What is the amount of work done on an equipotential surface?

Question 3
Between an alpha-particle and a proton which has more energy in a 100-Volt region?

Question 4
Which is correct for a series combination of capacitance? …

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## Physics Preparatory Test for Quarterly, Class XII, –I

Question 1
What’s the work done to take a charge Q on a circular voyage, on an equipotential surface?

A. Zero
B. Depends on radius of circle
C. Depends on distance from center of equipotential surface
D. Q/epsilon_0

Rutherford’s atomic model is based on which fact

A. Geiger Marsden scattering of alpha-{particles} suggests presence of nucleus.

B. Smith’s electrodes dipped in electrochemical material

C. Quantization of charge     D. Quantization of angular momentum

Question 6
What’s the typical energy output range of Indian nuclear reactors?

Question 7
Which of the following physical quantity is scalar: electric field intensity, electric potential, dipole moment?

Question 9
Use superposition principle of electric field intensity of two charges, to obtain the electric field intensity E of a dipole along the dipole axis. This is known as electric field for the End-on configuration.

Also use the same idea to obtain the potential at a point vertical to the dipole axis. This is known as potential for the Broad-on configuration.

Question 10
Obtain the electric field intensity E of a dipole vertical to the dipole axis, i.e. — Broad-on electric field. Also obtain the potential at a point on the dipole axis, i.e. — End-on potential.

Question 17
Describe the Van-de-Graaff generator, its principle, working and use.

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## Physics Preparatory Test for Quarterly, Class XII, –II

Physics preparatory tests for PUC, ISc, class XII in the CBSE, ICSE (CISCE), State boards.
Subject: Physics

Test: Preparatory test — II. Pre-Quarterly.
Class: PUC — II (also good for ISC — II)
date: 25 the June 2013.
Time: 1.5 hours.
Total marks: 50

Instructions.

— Numerical problems solved without writing the relevant formulas carry no marks.

— Answers without relevant diagrams, circuits wherever necessary will not carry any marks.

PART-A
I. Answer all the following questions (1 X 5)
Question 1
Where would Coulomb’s interaction be weaker, in dielectric medium or vacuum?

Question 2
Between a dipole and a point charge whose electric potential reduces faster?

Question 3
What is the work done when a charge makes a rectangular path on an equipotential surface?

Question 4
Write the de-Broglie formula for wavelength of a wave-particle if its momentum is p?

Question 5
Define refractive index from angle of incidence and angle of reflection.

PART-B
II. Answer any Five of the following questions, 2 marks each.   (2 X 5=10)
Question 6
State how density of electric lines of force is related to the electric field vector intensity E. Also mention another property of the lines of force and one property of the equipotential surface.

Question 7
Write the Gauss law of electrostatics and define electric flux for a uniform field E.

Question 8
How one defines the direction of a dipole vector? What’s the potential vertical to the dipole axis?

V. Answer any three of the following questions (5 X 3)
Question 19
A proton has a radius R and the charge Q is uniformly distributed. Use Bohr’s atomic energy level formula for the 1st excited state (n = 2) and ground state (n = 1) to obtain energy of the Hydrogen-atom.

Question 21
Draw a simple and neat diagram showing a convex lens, optical center and focal point (focus). Now define power of a lens and obtain an expression for it.

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