Physics Exam Quiz

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Questions and Answers

What is the S.I. unit of electric charge?

coulomb per metre

coulomb metre

coulomb (correct)

per coulomb

What is the angle between equipotential surface and electric field?

45º

0º

90º (correct)

180º

Which statement about the resistivity of metals with temperature is correct?

both I and II are false.

both I and II are true but II is not the correct explanation of I.

I is true but II is false.

both I and II are true and II is the correct explanation of I. (correct)

How can a moving coil galvanometer be converted into a voltmeter?

by connecting a high resistance in series with galvanometer. Signup and view all the answers

When suspended freely, a bar magnet points in which direction?

north-south Signup and view all the answers

What is the energy stored in an inductor of inductance L when establishing the current I?

$\frac{1}{2}LI^2$ Signup and view all the answers

In which direction is the current induced in the loop ‘abc’ if I is increasing?

along ‘abc’ Signup and view all the answers

Which of the following statements is true about the resistivity of metals?

Resistivity increases with increasing temperature. Signup and view all the answers

What is a molecule possessing a permanent dipole moment called?

Polar molecule Signup and view all the answers

What is the net magnetic flux through any closed surface?

Zero Signup and view all the answers

What is a rotating vector used to represent alternating quantities called?

Phasor Signup and view all the answers

What does a wavefront represent in terms of a surface?

Phase Signup and view all the answers

What is light composed of when interacting with matter?

Photons Signup and view all the answers

What represents the mobility of free electrons in conductors?

Drift speed Signup and view all the answers

What type of current is induced in an AC generator?

Alternating current Signup and view all the answers

Which type of telescope uses a refracting objective?

Refracting telescope Signup and view all the answers

An ideal step-up transformer decreases _______.

current Signup and view all the answers

The displacement current is due to

changing electric field Signup and view all the answers

An object of finite height placed in front of a concave mirror within its focus forms

a virtual enlarged image Signup and view all the answers

The intensity of emergent light when unpolarised light of intensity I0 passes through polaroids with pass-axes inclined at angle θ is equal to

$I_0 \cos \theta$ Signup and view all the answers

Emission of electrons from a metal surface by heating it is called

thermionic emission Signup and view all the answers

Most alpha particles go undeviated when passed through thin gold foil because

most of the region in an atom is empty space Signup and view all the answers

Nuclei with the same atomic number are called

isotopes Signup and view all the answers

Match the following materials with their energy band gaps: (i) conductors - (ii) insulators - (iii) semiconductors

(i) - (a), (ii) - (b), (iii) - (c) Signup and view all the answers

What is the effective emf in a series connection of two cells with different emfs?

Sum of the individual emfs Signup and view all the answers

Which of the following is a condition for constructive interference of two coherent waves?

Phase difference is a multiple of $360^{ ext{o}}$ Signup and view all the answers

What does the potential at a point due to a point charge depend on?

Charge magnitude and distance Signup and view all the answers

In a full-wave rectifier, which of the following statements is true?

It generates a waveform with only positive voltages Signup and view all the answers

What is the effective internal resistance in a series connection of cells?

Sum of individual internal resistances Signup and view all the answers

Which factor affects the angle of minimum deviation for a prism made of glass?

Type of optical material Signup and view all the answers

In a circuit with an inductor, capacitor, and resistor, how does the current behave in relation to the voltage at 50Hz frequency?

Current always lags the voltage Signup and view all the answers

What is the expression for the magnetic field at a point on the axis of a circular current loop?

$\frac{\mu_0 I R^2}{z(z^2 + R^2)^{3/2}}$ Signup and view all the answers

Study Notes

General Instructions

Exam is 3 hours long
45 questions
Part A is compulsory for all students
Part E is for visually impaired students
Answers without diagrams/figures/circuit diagrams will not be awarded marks
Numerical problems require formulas and detailed solutions

Part A - Multiple Choice Questions

15 multiple choice questions
Each question carries 1 mark
S.I. unit of electric charge is the coulomb
Angle between equipotential surface and electric field is 90°
Resistivity of metals increases with increasing temperature
Increasing temperature causes more frequent electron collisions
Converting a galvanometer to a voltmeter requires a high resistance in series
A freely suspended bar magnet aligns north-south
Energy stored in an inductor (L) with current (I) is 1/2LI²

Part B - Short Answer Questions

Answer any 5 of 10 questions
Each question carries 2 marks
Define Gauss's law in electrostatics
Explain drift velocity and mobility
Calculate magnetic field in a solenoid
Explain the principle of an AC generator and why it's called alternating
Write two uses of ultraviolet radiations
Name objective types for reflecting and refracting telescopes
Two conditions for total internal reflection
Identify majority/minority charge carriers in n-type semiconductors

Part C - Detailed Answer Questions

Answer any 5 of 10 questions
Each question carries 3 marks
Properties of electric field lines
Expression for capacitance in parallel
Explain Lorentz force and its expression
Differences between diamagnetic and paramagnetic materials.
Describe an experiment to demonstrate electromagnetic induction
Results of experimental photoelectric effect
Bohr's atomic model postulates

Part D - Detailed Answer Questions

Answer any 3 of 5 questions
Each question carries 5 marks
Electric field at a point on the axis of a dipole
Effective emf and internal resistance of series connected cells
Magnetic field at a point on the axis of a circular loop
Resultant displacement of coherent waves; constructive/destructive interference criteria
Full-wave rectifier circuit and input/output waveforms

Part E - Visually Impaired Questions

Single question
A circular loop is placed in a plane to the right of a straight current-carrying conductor. Determine the induced current direction.

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Description

This quiz covers key concepts in electricity and magnetism, featuring multiple choice and short answer questions. Students will demonstrate their understanding of laws, formulas, and the properties of electric currents and fields. Ensure to include diagrams and detailed solutions where required.