12th Physics Online Test 2026 – कक्षा 12वीं भौतिकी का ऑनलाइन टेस्ट यहां से दीजिए

The working principle of dynamo is based on

Picofarad is the unit of

SI unit of self induction is

Image formed in compound microscope is

Instrument used to increase input voltage per meter is called

If in a logic Gate output Y is obtained by the product of its both inputs (A.B) , then the gate is

Unit of linear charge density is

The with of Forbidden energy gap in the semiconductor is approximately

The nature of electron beams moving with uniform velocity in the same direction will be

The relation between electric field and electric potential is

SI unit of Decay constant is

The device which works of both modulation and demodulation is called

Photo cell is based on

Capacity of any condenser does not depends upon

The dielectric constant of a metal is

On moving from the surface of a charged metallic sphere to the centre of the sphere the electric field will be

What is produced by induction coil ?

The wavelength of which colour is minimum

What value of alternating current is measured by hot wire ammeter

Tu sources of monochromatic light is coherent when there

An electron of charge moves parallel to uniform lines of force in magnetic field B with velocity V force acting on electron is

Which of the following shows hysteresis?

• A magnet is situated near a closed conductor current can be produced in the conductor, if

Cathode rays are group of

Half line of radioactive substances is

An electron is accelerated to 5 volt potential difference the energy gained by the electron will be

The electrostatic energy of the system made by two electric dipoles kept at distance R is proportional to

Mean value of alternating current in a full cycle is

Distance of communication satellite from the surface of the Earth is

A galvanometer is converted into ammeter by adding

The colour of sky is blue due to

Instrument used to increase input voltage per meter is called

On oscillating any metallic Sphere in the magnetic field its oxilatory motion is

Which causes the formation of rainbow

The value of current obtained in a moving coil galvanometer is proportional to

In AC circuit power is lost in only

Current used in electroplating is

P-N junction diode is used as

To increase the sensitivity of Potentiometer

The fringe with in interference of light due to two coherent sources is

Kirchhoff's Second law of electricity is related to

Image of any object formed at the retina of human eye is

De-broglie wavelength is

In full wave rectifier if our input frequency is 50 Hz then output frequency will be

Unit of ractance is

The magnetic field produced at the centre of current carrying circular coil is

Convex lens is used to

Which of the following is blocked by a capacitor

Attenuation is measured in

A large virtual image of object is formed by

On dividing any magnet of magnetic moment parallel to its length into n equal pieces the moment of each pieces will be