12th Physics Important 5 Mark Question Paper

St. Britto Hr. Sec. School - Madurai

12th Physics Important 5 Mark Question Paper-Aug 2020

Time : 2.00 Hours

Part - A

Generic 5 - Answer All Question

Calculate the angle of dispersion between red and violet colours· produced by a flint glass prism of refracting angle of 60°. Given \(\mu_v\) =1.663 and = \(\mu_r\) 1.622.

What are the drawbacks of Rutherford atom model?

If the relative permeability and relative permittivity of the medium is 1.0 and 2.25, respectively. Find the speed of the electromagnetic wave in this medium.

Derive an expression for torque on a current loop placed in a magnetic field

An object is placed 40 cm from a convex lens of focal length 30 cm. If a concave lens of focal length 50 cm is introduced between the convex lens and the image formed such that it is 20 cm from the convex lens, find the change in the position of the image.

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

Three identical lamps each having a resistance R are connected to the battery of emf as shown in the figure.

Suddenly the switch S is closed. (a) Calculate the current in the circuit when S is open and closed (b) What happens to the intensities of the bulbs A,B and C. (c) Calculate the voltage across the three bulbs when S is open and closed (d) Calculate the power delivered to the circuit when S is opened and closed (e) Does the power delivered to the circuit decreases, increases or remain same?

A spark plug in a bike or a car is used to ignite the air-fuel mixture in the engine. It consists of two electrodes separated by a gap of around 0.6 mm gap as shown in the figure.

To create the spark, an electric field of magnitude 3 × 10⁶ Vm^-1 is required.
(a) What potential difference must be applied to produce the spark?
(b) If the gap is increased, does the potential difference increase, decrease or remains the same?
(c) find the potential difference if the gap is 1 mm.

A circular coil of radius 8.0 cm and 20 turns rotated about its vertical diameter with an angular speed of 50 rads in a uniform horizontal magnetic field of magnitude 3 X 10^-2T. Obtain the maximum and average emf induced in the coil if the coil forms a closed loop of resistance 10Ω then calculate the average power loss due to joule heating.

Find the intensity at a point on a screen in Young's double slit experiment where the interfering waves of equal intensity have a
path difference of

(i) \(\frac { \lambda }{ 4 } \) and

(ii) \(\frac { \lambda }{ 3 } \)

Calculate the amount of \(^{ 210 }_{ 84 }\)Po required to the particle of activity 5 millicurie. Given half-life of Po = 138 days, N_A = 6.023 x 10²³, 1 curie= 3.7 x 10¹⁰ disintegrations.

Define Power in AC circuits? Derive an relation between true power & virtual power?

Discuss the applications of Nanomaterials in various fields.

Draw the circuit diagram of a half wave rectifier and explain its working

A parallel plate capacitor has plate area, 25 cm⁺² and a separation of 2 mm between the plates. The capacitor is connected to a battery of 12V. Find the charge on the capacitor.

Consider a point charge +q placed at the origin and another point charge -2q placed at a distance of 9 m from the charge +q. Determine the point between the two charges at which electric potential is zero.

The magnetic flux passing through a coil perpendicular to its plane is a function of time and is given by \(\Phi\)B=(2t³+4t²+8t+8)Wb If the resistance of the coil is 5 Ω, determine the induced current through the coil at a time t = 3 second.

A double convex lens made of glass of refractive index 1.5 has both radii of curvature 20 cm each. Find the focal length of the lens. If an object is placed at a distance of 15 em from this lens, find the position of the image formed.

A transmitter consists of LC circuit with an inductance of 1 μH and a capacitance of 1 μF. What is the wavelength of the electromagnetic waves it emits?

Draw graphs showing the distribution of charge in a capacitor and current through an inductor during LC oscillations with respect to time. Assume that the charge in the capacitor is maximum initially.

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12th Physics Important 5 Mark Question Paper

St. Britto Hr. Sec. School - Madurai

12th Physics Important 5 Mark Question Paper-Aug 2020

Part - A

Generic 5 - Answer All Question

Calculate the angle of dispersion between red and violet colours· produced by a flint glass prism of refracting angle of 60°. Given \(\mu_v\) =1.663 and = \(\mu_r\) 1.622.

What are the drawbacks of Rutherford atom model?

If the relative permeability and relative permittivity of the medium is 1.0 and 2.25, respectively. Find the speed of the electromagnetic wave in this medium.

Derive an expression for torque on a current loop placed in a magnetic field

An object is placed 40 cm from a convex lens of focal length 30 cm. If a concave lens of focal length 50 cm is introduced between the convex lens and the image formed such that it is 20 cm from the convex lens, find the change in the position of the image.

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

Find the intensity at a point on a screen in Young's double slit experiment where the interfering waves of equal intensity have a path difference of (i) \(\frac { \lambda }{ 4 } \) and (ii) \(\frac { \lambda }{ 3 } \)

Calculate the amount of \(^{ 210 }_{ 84 }\)Po required to the particle of activity 5 millicurie. Given half-life of Po = 138 days, NA = 6.023 x 1023, 1 curie= 3.7 x 1010 disintegrations.

Define Power in AC circuits? Derive an relation between true power & virtual power?

Discuss the applications of Nanomaterials in various fields.

Draw the circuit diagram of a half wave rectifier and explain its working

A parallel plate capacitor has plate area, 25 cm+2 and a separation of 2 mm between the plates. The capacitor is connected to a battery of 12V. Find the charge on the capacitor.

Consider a point charge +q placed at the origin and another point charge -2q placed at a distance of 9 m from the charge +q. Determine the point between the two charges at which electric potential is zero.

The magnetic flux passing through a coil perpendicular to its plane is a function of time and is given by \(\Phi\)B=(2t3+4t2+8t+8)Wb If the resistance of the coil is 5 Ω, determine the induced current through the coil at a time t = 3 second.

A double convex lens made of glass of refractive index 1.5 has both radii of curvature 20 cm each. Find the focal length of the lens. If an object is placed at a distance of 15 em from this lens, find the position of the image formed.

A transmitter consists of LC circuit with an inductance of 1 μH and a capacitance of 1 μF. What is the wavelength of the electromagnetic waves it emits?

Draw graphs showing the distribution of charge in a capacitor and current through an inductor during LC oscillations with respect to time. Assume that the charge in the capacitor is maximum initially.

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Find the intensity at a point on a screen in Young's double slit experiment where the interfering waves of equal intensity have a
path difference of

(i) \(\frac { \lambda }{ 4 } \) and

(ii) \(\frac { \lambda }{ 3 } \)

Calculate the amount of \(^{ 210 }_{ 84 }\)Po required to the particle of activity 5 millicurie. Given half-life of Po = 138 days, N_A = 6.023 x 10²³, 1 curie= 3.7 x 10¹⁰ disintegrations.

A parallel plate capacitor has plate area, 25 cm⁺² and a separation of 2 mm between the plates. The capacitor is connected to a battery of 12V. Find the charge on the capacitor.

The magnetic flux passing through a coil perpendicular to its plane is a function of time and is given by \(\Phi\)B=(2t³+4t²+8t+8)Wb If the resistance of the coil is 5 Ω, determine the induced current through the coil at a time t = 3 second.