In ruby laser, the stimulated emission is due to transition from

A direct current I flows along the length of an infinitely long straight thin walled pipe, then the magnetic field is

convex lens made of glass has focal length 0.15m in air. If the refractive index of glass is 3/2, and that of water is 4/3 the focal length of lens when immersed in water is

Two sources are said to be coherent if they produce waves

Three resistors 1 Ω, 2 Ω, 3Ω resistor a 3 V battery is connected. The current through 3 Ω resistor is -

In a common emitter amplifier the input signal is applied across

Adding detergents to water helps in removing dirty greasy stains. This is because
1. It increases greasy stains. This is because
2. It decreases the oil-water surface tension
3. It increases the viscosity of the solution
4. Dirt is held suspended surrounded by detergent molecules

Choose the correct statement (a) for a cricket ball that is spinning clockwise through air
S1 : Statemlines of air are symmetric around the ball.
S2 : The velocity of air above the ball relative to it is larger than that below the ball.
S3 : The velocity of air above the ball relative to it is smaller than that below the ball.
S4 : There is a net upward force on the ball.

Ferromagnetic materials used in a transformer must have

According to Newton’s corpuscular theory, the speed of light is

For the constructive interference the path difference between the two interfering waves must be equal to

The accurate measurement of emf can be obtained using

A person, with outstretched arms, is spinning on a rotating stool. He suddenly brings his arms down to his sides. Which the following is true about his kinetic energy K and angular momentum L?

Which of the following is not a thermodynamic coordinate?

An antenna uses electromagnetic waves of frequency 5 MHz . For proper working, the size of the antenna should be

What is the S.I. unit of force?

Which physical quantity has the S.I. unit Joule?

Which unit is used for measuring momentum in the S.I. system?

Which quantity is dimensionless?

What is the S.I. unit of work?

Which quantity remains constant in the horizontal direction for a projectile?

Which equation describes position in uniform acceleration motion?

Which factor does NOT affect the horizontal range of a projectile?

What is the direction of centripetal force in uniform circular motion?

What is the S.I. unit of angular velocity?

Which force provides centripetal force in a car turning on a curved road?

Which quantity is constant in uniform circular motion?

Which term describes the force required to keep an object in circular motion?

Which factor does NOT affect centripetal force?

What is inertia?

The electric field due to an infinite line charge is proportional to?

Poisson’s equation is derived from?

Laplace’s equation applies to regions that are?

The general solution to Laplace’s equation in spherical coordinates with azimuthal symmetry involves?

The electric field inside a uniformly charged solid sphere varies as?

The uniqueness theorem for boundary value problems requires?

In Poisson’s equation with uniform charge density, the potential is?

The electric field outside a charged conducting sphere is equivalent to that of a?

Laplace’s equation is a?

The electric potential due to a point charge varies as?

The electric field inside a conductor in electrostatic equilibrium is?

The flux through a Gaussian surface depends on?

The solution to Laplace’s equation in cylindrical coordinates often involves?

The potential inside a hollow charged conductor is?

The method of images is used to solve?

हाइड्रोजन परमाणु में सूक्ष्म संरचना में क्या शामिल है?

परिवर्तनीय विधि क्या प्रदान करती है?

परिवर्तनीय विधि में परीक्षण तरंगफलन क्या है?

WKB सन्निकटन कब मान्य होता है?

WKB कनेक्शन सूत्र का उपयोग किसके लिए किया जाता है?