Physics Exam Q&A - Mechanics and Electromagnetism

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Questions and Answers

Which property does not apply to electromagnetic waves traveling in free space?

  • They originate from charges moving with uniform speed. (correct)
  • They travel with a speed equal to $\sqrt{\mu_0 \epsilon_0}$.
  • They are transverse in nature.
  • Energy density in the electric field equals energy density in the magnetic field.

What is the correct relation of the pressure intensities P1, P2, and P3 for electromagnetic waves?

  • P1 > P2 > P3 (correct)
  • P1 > P3 > P2
  • P3 > P2 > P1
  • P2 > P1 > P3

What is the formula for the energy density relation in electromagnetic waves?

  • Energy density of electric field = 2 * Energy density of magnetic field
  • Energy density of electric field < Energy density of magnetic field
  • Energy density of electric field = Energy density of magnetic field (correct)
  • Energy density of electric field > Energy density of magnetic field

If an iron bar is bent at the middle, what happens to its magnetic moment?

<p>It remains unchanged. (C)</p> Signup and view all the answers

For the metallic bar heated from 0°C to 100°C, what is the compressive force developed?

<p>50 × 10^3 N (C)</p> Signup and view all the answers

What is the Young's modulus of the metallic bar mentioned?

<p>0.5 × 10^11 N m–2 (D)</p> Signup and view all the answers

What angle do the two arms of the bent iron bar make with each other?

<p>60° (B)</p> Signup and view all the answers

Which of the following statements about the compressive force is true?

<p>It is directly proportional to the Young's modulus. (C)</p> Signup and view all the answers

Which of the following statements about a solar cell's I-V characteristics is correct?

<p>The characteristics lie entirely in the IV quadrant. (A)</p> Signup and view all the answers

In a reverse biased pn junction diode, which charge carriers contribute to the measured current?

<p>The current is primarily from the recombination of minority charge carriers. (B)</p> Signup and view all the answers

Which of the following pairs of quantities have the same dimensions as a solid angle?

<p>Strain and angle (C)</p> Signup and view all the answers

If two bodies A and B of the same mass collide completely inelastically, how does their final velocity relate to their initial velocities?

<p>The final velocity can be calculated using the formula $v_f = \frac{m_1v_1 + m_2v_2}{m_1 + m_2}$. (C)</p> Signup and view all the answers

What is the result of a completely inelastic collision?

<p>The two bodies stick together after the collision. (D)</p> Signup and view all the answers

What can be concluded about the relationship between kinetic energy and the de Broglie wavelength?

<p>There is an inverse relationship between kinetic energy and de Broglie wavelength. (D)</p> Signup and view all the answers

Which statement about the I-V characteristics of solar cells is incorrect?

<p>The characteristics can show negative current during operation. (B)</p> Signup and view all the answers

What happens to the interference pattern when a monochromatic source in Young's double slit experiment is replaced by white light?

<p>There will be a central dark fringe surrounded by several colored fringes. (A), There will be a central bright white fringe surrounded by a few colored fringes. (D)</p> Signup and view all the answers

What occurs when unpolarised light strikes a glass surface at an angle?

<p>It polarizes upon reflection and refraction. (A)</p> Signup and view all the answers

What is the output of the given logic gate if it is similar to one of the basic gates?

<p>The output is like a NOR gate. (D)</p> Signup and view all the answers

What is the value of the acceleration due to gravity on the planet mentioned?

<p>3.92 m/s² (A)</p> Signup and view all the answers

What is the equivalent capacitance between terminal A and terminal B in the circuit described?

<p>2 mF (A)</p> Signup and view all the answers

What is the calculated magnetic field at the center of a tightly wound coil with 100 turns, radius 10 cm, carrying a current of 7 A?

<p>44 mT (A)</p> Signup and view all the answers

If the mass of the bob in a simple pendulum is tripled and its length is halved, what is the value of x for the new time period compared to the original time?

<p>2 (C)</p> Signup and view all the answers

Given the displacement of a particle as 2t - 1, what is the instantaneous power at any time t if the force acting on the particle is 5 N?

<p>10 (A)</p> Signup and view all the answers

Which of the following statements accurately describes what occurs in Young's double slit experiment when using monochromatic light?

<p>The pattern consists of both bright and dark fringes. (D)</p> Signup and view all the answers

What would be the expected effect on the time period of a simple pendulum if its length is reduced to half?

<p>It decreases by a factor of √2 (D)</p> Signup and view all the answers

If a magnetic field of 44 mT is measured at the center of a coil, what can be inferred about the number of turns and the current?

<p>More turns or a higher current contributes to a stronger magnetic field. (C)</p> Signup and view all the answers

If the voltage of a capacitor is doubled, how does this affect the energy stored in the capacitor?

<p>It quadruples (C)</p> Signup and view all the answers

What happens to the frequency of an AC supply when it is increased from 50 Hz?

<p>It becomes 60 Hz (C)</p> Signup and view all the answers

What is likely to occur if white light is used in an experiment instead of monochromatic light?

<p>A central bright fringe surrounded by colored fringes will form. (A)</p> Signup and view all the answers

When analyzing results from a logic gate, which of these outputs indicates a behavior similar to an AND gate?

<p>The output is true only if both inputs are true. (A)</p> Signup and view all the answers

In an RC circuit, if the resistance is held constant while the capacitance is halved, what is the effect on the time constant?

<p>It is halved (B)</p> Signup and view all the answers

If you were to combine two capacitors in series, how would this affect the overall capacitance?

<p>It decreases (A)</p> Signup and view all the answers

What is the ratio of power outputs for the two cases mentioned?

<p>2 : 9 (D)</p> Signup and view all the answers

The magnifying power of a small telescope with an objective focal length of 140 cm and an eyepiece of 5.0 cm is?

<p>28 (D)</p> Signup and view all the answers

Which force is required to hold a sheet on a horizontal surface in front of a strong magnetic pole if the sheet is magnetic?

<p>A force to hold the sheet stationary (B)</p> Signup and view all the answers

When moving a conducting sheet away from a magnetic pole at a uniform velocity, which statement is correct?

<p>It involves electrodynamic effects (D)</p> Signup and view all the answers

Which option indicates a case requiring a force for a non-magnetic sheet placed in front of a strong magnetic pole?

<p>To hold it stationary (D)</p> Signup and view all the answers

Which option correctly identifies the necessary action for a non-conducting and non-polar sheet placed in front of a strong magnet?

<p>It will not require any force (C)</p> Signup and view all the answers

What defines the factor in the equation F = at² + bt that is dimensionless?

<p>ab (D)</p> Signup and view all the answers

Which combination of statements is correct about the actions required for moving sheets under magnetic forces?

<p>A and C only (A)</p> Signup and view all the answers

Which point moves slower on the wheel of a bullock cart rolling on a level road?

<p>Point P moves slower than Point Q. (A)</p> Signup and view all the answers

Considering the velocity-time plot shown, what can be inferred about the acceleration of the body?

<p>The acceleration is constant and equal to zero. (B)</p> Signup and view all the answers

If the mass of a planet is one-tenth that of the Earth, how does its gravitational pull compare to that of Earth?

<p>The gravitational pull is one-tenth of that of Earth. (D)</p> Signup and view all the answers

Which statement about the motion of point P and point Q on a rolling wheel is correct?

<p>Point Q has a linear speed equal to that of the cart. (C)</p> Signup and view all the answers

In the acceleration-time graph that fits the provided velocity-time motion, which statement is true?

<p>The acceleration stays constant for all times. (C)</p> Signup and view all the answers

What is true about the speed of point P during the rotation of the wheel?

<p>The speed of point P is higher than the speed of point Q when the wheel rolls. (B)</p> Signup and view all the answers

If a body's velocity remains constant over a time interval, what can be concluded about its motion?

<p>The body must have zero net forces acting on it. (A)</p> Signup and view all the answers

Given that a planet's diameter is half that of Earth, what can be assumed about its surface gravity relative to Earth?

<p>Surface gravity will be eight times weaker. (C)</p> Signup and view all the answers

Flashcards

Young's double-slit experiment with white light

Replacing a monochromatic light source with white light in Young's double-slit experiment results in a central bright white fringe surrounded by coloured fringes.

Magnetic field at coil centre

The magnetic field strength at the center of a current-carrying coil is calculated using the formula relating current, number of turns, radius and permeability of free space.

Logic gate output similar to AND

Logic gate output with the same pattern as an AND gate.

Instantaneous power from displacement

Calculate the instantaneous power using the given force and displacement formula with time

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Double-slit interference with white light

White light results in a central bright white fringe with coloured fringes.

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Magnetic field formula

B = (µ₀ * N * I) / (2 * R) , Where : B = magnetic field , µ₀ = permeability of free space , N = number of turns , I = current , R = radius

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NAND gate output

The output of a NAND gate is true if and only if all the inputs are false.

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Interference pattern disappearance

If a monochromatic source in Young's double-slit experiment is replaced by white light, an interference pattern will not disappear.

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Solar-cell I-V Characteristics

The graph showing the current (I) flowing through a solar cell versus the voltage (V) across it. This graph's location in the I-V plane indicates the solar cell's behavior.

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Reverse-Biased Diode Current

In a reverse-biased p-n junction diode, the current is primarily due to minority charge carriers (electrons in the p-region and holes in the n-region), not majority carriers.

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Dimensions of Solid Angle

Solid angle has the same dimensions as the ratio of area to the square of distance.

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Completely Inelastic Collision

A collision where the colliding objects stick together after the impact, resulting in a combined velocity.

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Kinetic Energy and De Broglie Wavelength

The kinetic energy of a particle is inversely proportional to its de Broglie wavelength.

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Inelastic Collision Velocity

The velocity of the combined mass after a completely inelastic collision, given the initial velocity of one object.

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I-V Characteristics Quadrant

The location of a solar cell's graph on the I-V plane determines its operation.

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Collision type after impact

A collision type where the two objects merge after impact, resulting in one entity of mass.

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Acceleration due to gravity

The rate at which an object's velocity changes due to gravity. Measured in meters per second squared (m/s^2).

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Equivalent capacitance

The single capacitance value that would have the same effect as a combination of capacitors in a circuit.

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Simple pendulum period

Time taken for one complete oscillation of a simple pendulum.

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Capacitor connection

A 10mF capacitor is connected to a circuit with 210V and 50Hz features.

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Circuit equivalent capacitance

The combined capacitance of capacitors in a circuit measured between two terminals.

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Increased pendulum mass and length

How changing the mass and length of a pendulum affects its time period.

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Capacitor Value

The electrical capacitance value is 10mF.

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Circuit capacitance between terminals

The equivalent capacitance value for a given circuit configuration between terminals A and B

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Wheel speed P & Q

Point P on a rolling wheel moves faster than point Q.

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Planet mass relative to Earth

The mass of the planet is 1/10th the mass of Earth.

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Planet diameter relative to Earth

The planet's diameter is half of Earth's diameter.

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Velocity-time graph slope

The slope of a velocity-time graph represents acceleration.

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Acceleration-time graph for constant velocity

A horizontal line on an acceleration-time graph indicates constant velocity.

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Acceleration-time graph for changing velocity

A non-horizontal line (sloped) on an acceleration-time graph indicates changing velocity.

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Constant velocity acceleration

Constant velocity means zero acceleration.

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Rolling wheel point speeds

The point on a rolling wheel furthest from the axle (P) moves faster than the point closest (Q).

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Power output ratio (two cases)

The ratio of power output in two different scenarios.

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Telescope magnifying power

The ability of a telescope to enlarge the apparent size of distant objects.

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Magnetic sheet force

The force required to hold or move a sheet in front of a magnetic pole.

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Dimensionless factor (force)

A factor in a force equation that carries no units.

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Focal length of Objective (Telescope)

The distance between the objective lens and the focal point of the lens in a telescope.

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Focal length of Eye Piece (Telescope)

The distance between the eye-piece lens and the focal point of the lens in a telescope.

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Sheet movement criteria (magnetic)

Conditions for moving a sheet if it's magnetic or non-magnetic in front of a magnet.

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Non-conducting and non-polar sheet movement

Conditions for moving a sheet that is neither conducting nor has a magnetic dipole moment.

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Electromagnetic wave property in free space

Electromagnetic waves in a vacuum have transverse nature and equal energy density in electric and magnetic fields, traveling at a specific speed (c = 1/√(µ₀ε₀)).

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Speed of EM waves

The speed of electromagnetic waves in a vacuum, denoted c, is a constant and is related to the permeability and permittivity of free space (c=1/√(µ₀ε₀)).

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Magnetic moment of bent bar

A bar magnet bent at its center to form a 60º angle retains half of its initial magnetic moment.

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Compressive force in heated bar

Heating a metallic bar without expansion or bending causes a compressive force dependent on the Young's modulus and the thermal expansion coefficient.

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Electromagnetic wave origin

Electromagnetic waves originate from accelerating charges.

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Energy density

Equal energy density in electric and magnetic fields for EM waves.

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EM wave nature

EM waves are transverse waves.

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Ordering of parameters

The correct order of parameters in a specific problem regarding electromagnetic wave properties and related calculations may relate to speed, origin, and properties of the wave.

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Study Notes

Physics Exam Questions and Answers

  • Physics Section-A (Questions 1-35): Various physics concepts are tested, including mechanics, circular motion, logic circuits, and electromagnetism.
  • Question 1: A bob is whirled horizontally; tension in the string changes with speed.
  • Question 2: A particle in circular motion maintains varying acceleration.
  • Question 3: A logic circuit's output Y is based on truth table input combination.
  • Question 4: A strong bar magnet moves toward solenoids. Direction of induced current in each solenoid is identified.
  • Question 5: Potential at an axial point due to a dipole; relation between assertion and reason.
  • Question 6: Matching materials to their magnetic susceptibility.

Physics Section-B (Questions 36-50):

  • Question 36: Velocity versus time graph and associated acceleration versus time graph.
  • Question 37: Time period of a pendulum changes with mass and length.
  • Question 38: A 10μF capacitor is connected to a 210 V/50 Hz source. Peak current calculations are shown.
  • Question 39: Graph representing the relationship between temperature and volume of an ideal gas.
  • Question 40: Magnetic moment of a bent iron bar.
  • Question 41: Energy required to launch a satellite into orbit.
  • Question 42: Current in the gap of a parallel-plate capacitor.
  • Question 43: Property not associated with electromagnetic waves.
  • Question 44: Force arising from thermal expansion of a metallic bar.
  • Question 45: Bridge balance circuit diagram.
  • Question 46: Force required to move a sheet near a magnetic pole.
  • Question 47: Effect of bringing plates of capacitor closer.
  • Question 48: Power output ratios of two heaters in series and parallel.
  • Question 49: Magnifying power of a telescope.
  • Question 50: Dimensionless factor from force equation.

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