12th Physics Important 3 Mark Question Paper

St. Britto Hr. Sec. School - Madurai

12th Physics Important 3 Mark Question Paper-Aug 2020

Time : 1.30 Hours

Part - A

Generic 3 - Answer All Question

A conducting rod of length 0.5 m falls freely from the top of a building of height 7.2 m at a place in Chennai where the horizontal component of Earth’s magnetic field is 40378.7 nT. If the length of the rod is perpendicular to Earth’s horizontal magnetic field, find the emf induced across the conductor when the rod is about to touch the ground. [Take g = 10 m s^-2]

Write short notes on
(a) microwave
(b) X-ray
(c) radio waves
(d) visible spectrum

Derive an expression for electrostatic potential due to a point charge.

Derive an expression for phase angle between the applied voltage and current in a series RLC circuit.

What is absorption spectra?. Give their types.

The resistance of a wire is 20 Ω. What will be new resistance, if it is stretched uniformly 8 times its original length?

Derive an expression for electrostatic potential due to an electric dipole.

Calculate the equivalent resistance for the circuit which is connected to 24 V battery and also find the potential difference across 4 Ω and 6 Ω resistors in the circuit.

Obtain the expression for energy stored in the parallel plate capacitor.

Discuss the working of cyclotron in detail.

Obtain the expression for electric field due to an charged infinite plane sheet.

Consider two coplanar, co-axial circular coils A and B as shown in figure. The radius of coil A is 20 cm while that of coil B is 2 cm. The number of turns is 200 and 1000 for coils A and B respectively. Calculate the mutual inductance of coil B with respect to coil A. If the current in coil A changes from 2 A to 6 A in 0.04 sec, determine the induced emf in coil B and the rate of change of flux through the coil B at that instant.

Magnetic field lines can be entirely confined within the core of toroid, but not within a straight solenoid. Why?

Compute the current in the wire if a charge of 120 C is flowing through a copper wire in 1 minute.

What is the phase relation between current and emf in an AC circuit containing a cpacitor only? Sketch a graph showing the variation the reactance of a capacitor with frequency.

How is electric flux is related to electric field.

Define and derive an expression for the energy density in parallel plate capacitor.

Write the conditions for nature of objects and images.

Identify the Electromagnetic waves whose wavelength vary as
(a) 10^-12 m to 10^-8 m
(b) 10-4m and write their uses.

A block of mass m and positive charge q is placed on an insulated frictionless inclined plane as shown in the figure. A uniform electric field E is applied parallel to the inclined surface such that the block is at rest. Calculate the magnitude of the electric field E.

Give the advantage of AC in long distance power transmission with an example.

Calculate the electrostatic force and gravitational force between the proton and the electron in a hydrogen atom. They are separated by a distance of 5.3 × 10^-11 m. The magnitude of charges on the electron and proton are 1.6 × 10^-19 C. Mass of the electron is m_e = 9.1 × 10^-31 kg and mass of proton is m_p = 1.6 × 10^-27 kg.

InstaQB

Institutions

12th Standard English Medium

12th Standard Tamil Medium

11th Standard English Medium

11th Standard Tamil Medium

10th Standard English Medium

9th Standard English Medium

8th Standard English Medium

7th Standard English Medium

Class XII

Class XI

12Th Standard

11Th Standard

10Th Standard

9Th Standard

12th Physics Important 3 Mark Question Paper

St. Britto Hr. Sec. School - Madurai

12th Physics Important 3 Mark Question Paper-Aug 2020

Part - A

Generic 3 - Answer All Question

Write short notes on (a) microwave (b) X-ray (c) radio waves (d) visible spectrum

Derive an expression for electrostatic potential due to a point charge.

Derive an expression for phase angle between the applied voltage and current in a series RLC circuit.

What is absorption spectra?. Give their types.

The resistance of a wire is 20 Ω. What will be new resistance, if it is stretched uniformly 8 times its original length?

Derive an expression for electrostatic potential due to an electric dipole.

Calculate the equivalent resistance for the circuit which is connected to 24 V battery and also find the potential difference across 4 Ω and 6 Ω resistors in the circuit.

Obtain the expression for energy stored in the parallel plate capacitor.

Discuss the working of cyclotron in detail.

Obtain the expression for electric field due to an charged infinite plane sheet.

Magnetic field lines can be entirely confined within the core of toroid, but not within a straight solenoid. Why?

Compute the current in the wire if a charge of 120 C is flowing through a copper wire in 1 minute.

What is the phase relation between current and emf in an AC circuit containing a cpacitor only? Sketch a graph showing the variation the reactance of a capacitor with frequency.

How is electric flux is related to electric field.

Define and derive an expression for the energy density in parallel plate capacitor.

Write the conditions for nature of objects and images.

Identify the Electromagnetic waves whose wavelength vary as (a) 10-12 m to 10-8 m (b) 10-4m and write their uses.

A block of mass m and positive charge q is placed on an insulated frictionless inclined plane as shown in the figure. A uniform electric field E is applied parallel to the inclined surface such that the block is at rest. Calculate the magnitude of the electric field E.

Give the advantage of AC in long distance power transmission with an example.

Write the Properties of magnet.

Elaborate the standard construction details of AC generator

Mention the various energy losses in a transformer

Comment

Other Study material

12th Physics Monthly Test - 3 ( Magnetism and magn

12th Physics Monthly Test - 1 ( Electromagnetic In

12th Physics Monthly Test - 2 (Current Electricity

12th Physics Monthly Test - 3 ( Current Electricit

12th Physics Monthly Test - 1 ( Magnetism and magn

12th Physics Monthly Test - 2 ( Magnetism and magn

12th Physics weekly Test - 1 ( Communication Syste

12th Physics weekly Test - 2 ( Communication Syste

12th Physics weekly Test - 1 ( Recent Developments

12th Physics weekly Test - 2 ( Recent Developments

12th Physics Monthly Test - 1 ( Electrostatics )

12th Physics Monthly Test - 2 ( Electrostatics )

12th Physics Monthly Test - 2 ( Electrostatics )

12th Physics Monthly Test - 3 ( Electrostatics )

12th Physics Monthly Test - 1( Current Electricity

Tamilnadu Stateboardszs - Class

Write short notes on
(a) microwave
(b) X-ray
(c) radio waves
(d) visible spectrum

Identify the Electromagnetic waves whose wavelength vary as
(a) 10^-12 m to 10^-8 m
(b) 10-4m and write their uses.